VECU - Manual de producción 70312913

Production ManualVolvo Buses

t)
Control Unit, VECU (Vehicle Electronical Control Uni Issue 2
P

Preface

The description and instructions in this manual are based on design and methodstudies placed until

The products are under continues development. Vehicles and components pro-duced after the above date may therefore have different specifications and meth-ods. When this is judged to have significant bearing on this manual, updates willbe made to cover changes.

The new edition of this manual will update the changes.

The following levels of observation, caution and warning are used in this docu-mentation:

Note! Indicates a situation, handling or circumstance which should be observed.

Important! Indicates a situation, handling or circumstance which should be emphasized so as not to lead to personal injury or damage to property.

Caution! Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or damage to property.

Warning! Indicates a potentially hazardous situation which, if not avoided, could result in death, serious injury or damage to property.

Danger! Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

Volvo Bus CorporationGothenburg, Sweden

© Volvo Bus Corporation, Gothenburg

All rights reserved. No parts of this publication may be reproduced, stored in retrieval system, or transmitted in any forms by any means, electronic, mechanical, photocopying, recording or otherwise, with-out prior written permission of Volvo Bus Corporation.

SW Production Preparation Volvo Bus Corporation Document No: 70312913Dept 80643 405 08 Gothenburg Issue date: 11/7/2000

Sweden

Part number: 70312913

July 2000

3


Sweden

Table of contents

Abbreviations .........................................................................................4

1.0 Vehicle Electronical Control Unit, VECU .............................................51.1 General, control unit ........................................................................................51.2 VECU functions ...............................................................................................61.3 Block diagram for VECU ................................................................................81.4 General, tests ....................................................................................................91.5 Software ...........................................................................................................9

2.0 Tests ......................................................................................................102.1 General, test performance ..............................................................................102.2 Read faultcodes ..............................................................................................112.3 Reset faultcodes .............................................................................................122.4 Test of key switch with or without preheating ...............................................132.5 Test of startbutton with preheat or without ....................................................142.6 Test of EOL (End Of Line) ............................................................................152.7 Test, voltage of battery ...................................................................................162.8 Test of cruise control ......................................................................................172.9 Test of windshield wipers and washer ...........................................................182.10 Test of windshield wiper interval ...................................................................192.11 Test of vehicle speed sensor ...........................................................................212.12 Test of accelerator pedal ................................................................................222.13 Test of parking brake switch ..........................................................................232.14 Retarder lever .................................................................................................242.15 Brake pressure switch ....................................................................................262.16 Brake pedal switch .........................................................................................272.17 Clutch pedal switch ........................................................................................282.18 Brake light, retarder .......................................................................................292.19 Status Microswitch Clutch, Test ....................................................................30

2.20 Status Microswitch Brake, Test .....................................................................31

4


Sweden

Abbreviations

The abbreviations used in this manual are explained in the table below:

Abbreviation Description

CC Cruise Control

EBR Engine Brake

EECU Engine Electronic Control Unit

EOL End Of Line

EPG Exhaust Power Gate

FMI Failure Mode Identifier

IS Idle Switch

MID Message Identification Description

VEB Volvo Engine Brake

VECU Vehicle Electronical Control Unit

VISP Vehicle Inspection by System Parameters

IVS1 Idle Valve Switch 1

Vehicle Electronical Control Unit, VECU 5

SW ProduDept 8064

on-stem, be

and

g on

1.0 Vehicle Electronical Control Unit, VECU

1.1 General, control unit

The MID number for the vehicle (VECU) is 144.

The main function of the VECU is to gather data from the different driver ctrols inside the bus, and send them on to the other control units in the symainly to the EECU. VECU also has some built-in functions, that used tohandled by the combination relay.

The vehicle control unit is connected to both the control link (SAE J1939)the information link (SAE J1587).

VECU is often installed beneath the dashboard.

Figure 1. The picture displays where the different control units may be mounted. Dependinmodel and variant of the bus, the location of the control units may differ.

1. Instrument cluster and display (BIC), MID 140 and 234

2. Vehicle control unit (VECU), MID 144

3. Control unit for chassis (CECM), MID164

4. Input/Output A Module(s)

5. Control unit for brake system (ABS), MID 136

6. Electronically Controlled Suspension (ECS)

7. Pusher control unit (PCU, only for articulated variants)

8. Transmission electronical control unit (TECU) ZF/Voith, MID 130

9. Electronical engine control unit (EECU), MID 128

14XX001

ction Preparation Volvo Bus Corporation Document No: 703129133 405 08 Gothenburg Issue date: 11/7/2000

Sweden

6 Vehicle Electronical Control Unit, VECU

SD

er on k, to

cir- the con-riv-

t the rake

ng on eter,

wich

.

Figure 2. The VECU.

1.2 VECU functions

These are the VECU functions.

• Accelerator pedal

The signals from the accelerator pedal are sent to VECU, and then furthto the EECU via the control link. If there is an open circuit in the control linthe signals from the accelerator pedal will be sent on the information linkthe EECU. The EECU control unit has an emergency function, that makes it possible for the bus to be driven with reduced speed, in case of an opencuit in both data links. In that case it is the idle valve switch that handlesacceleration. The idle switch is connected to the EECU with a separate nection, and it will indicate if the accelerator pedal is in idle position or ding position.

• Cruise control and Redundant brake switch

The cruise control is operated by a four function control switch located alever on the left side of the steering wheel. When braking the redundant bswitch is set and cruise control is inhibited.

• Vehicle speed

The vehicle speed signal is sent from a sensor on the gearbox. Dependithe variant of the bus, such as if the bus has a tachograph or a speedomthe transfer and the processing of the signal differs.

Tachograph

The signal is transferred via a separate connection that is sealed to the tachograph. The tachograph then sends a frequency signal to the VECUforwards the message to both data links.

Speedometer (without tachograph)

14XX002

W Production Preparation Volvo Bus Corporation Document No: 70312913ept 80643 405 08 Gothenburg Issue date: 11/7/2000

Sweden


SW ProduDept 8064

ent con-

nd

pe-

e .

in

in

mit.

The supply voltage for the sensor on the gearbox comes from the instrumcluster. The signal (vehicle speed) is sent from the sensor via a separatenection to the VECU wich forwards the message to both data links. The speedometer then receives the signal from the information link.

• Increased idling speed

This function can be controlled by VECU.

• Key switch/start button

VECU controls the function of the key switch/start button for the EECU, athe preheating function.

• Engine and exhaust brake

VECU controls the exhaust brake and the engine brake.

• Windshield wiper

VECU controls the interval- and wiper function during wash of the wind-shield.

• Hand retarder

Auxiliary brake system, controlled by a five function control switch at a scial lever.

• Foot retarder (and brake pedal control)

Auxiliary brake system controlled by a potentionmeter built into the brakpedal. By setting the brake pedal control switch, the function is disabled

• Engine torque limit 1

A digital input used to create an engine torque reduction message. Usedarticulated applications.

• Engine torque limit 2

A digital input used to create an engine torque reduction message. Usedarticulated applications.

• Engine speed limit

A digital input used to create a message to the engine regarding speedliUsed in articulated applications to get idle speed in certain conditions.


Sweden

8 Vehicle Electronical Control Unit, VECU

SD

ncesalid.

con-

+)

1.3 Block diagram for VECU

The block diagrams in this manual are general. If there are any differebetween the block diagram and the wiring diagram, the wiring diagram is v

Figure 3.

Figure 4. The figure shows the block diagram for 24 V supply voltage.

In the texts for operator, timeout and evaluation, you are able to see whichnection is being tested.Example:CC: SET+ SIGNAL IS LOW, VECUPA2

Explanation: In this test, the signal on connection PA2 (cruise control SETis too low.Probable cause: An open circuit.

14XX003


Sweden


SW ProduDept 8064

ECU

by

1.4 General, tests

You must perform a number of tests to ensure that the control system for Vis correctly mounted.

1.5 Software

The software used for testing the control unit is VISP (Vehicle InspectionSystem Parameters).


Sweden

10 Tests

SD

tion isned, it

reen”n the

2.0 Tests

2.1 General, test performance

The sequence for the tests is decided when the settings for each workstabeing performed. The sequence described in this manual is not predetermiis just a brief explanation of each test available in VISP.

In the description of each test, the phrase “instructions shown on the scmeans that the operator receives instructions from the VISP-program ocomputer screen.


Sweden

Tests 11

SW ProduDept 8064

2.2 Read faultcodes

VISP reads possible faultcodes and displays them on the screen.

2.2.1 Text for the operator

The following text is shown on the screen:

• Read FMI, VECU

Explanation: VISP reads the faultcodes that are set in the VECU.

Figure 5. The picture shows the computer screen information.14XX007


Sweden

12 Tests

SD

auto-uring

ry. Ifst be

ke a

to )

2.3 Reset faultcodes

VISP resets the faultcodes that may occur in the control unit. This test is matically performed by VISP, the operator does not have to do anything dthe test.

When the ECU resets error codes, it only resets them from the RAM-memothe error codes are to be reset permanently, the non-volatile memory mureset. This will be done when the key switch is turned off. The reset will tafew seconds.

Note! If the main power switch is turned off before the key switch, the errorcodes will still be in the non-volatile memory. Therefore the operator needsturn off the keyswitch for a few seconds (after error codes have been resetbefore the main power is turned off.


The following instruction is shown on the screen:

• Reset FMI, VECU

Explanation: VISP resets the faultcodes from the VECU.


Sweden

Tests 13

SW ProduDept 8064

ntrol

tionsold itsitiontest is

at, is

nd

d it

-

2.4 Test of key switch with or without preheating

In this test, VISP checks that the key switch is connected to the vehicle counit.

If the bus is equipped with preheating, the operator receives three instrucon the screen. The first is to turn the key switch to preheat position and hthere. The second instruction asks the operator to turn the key to start poand hold it there. Finally the operator is asked to release the key and the done.

If the bus is not equipped with preheating the first step, turn key to preheleft out.

2.4.1 Texts for the operator

The following instructions are shown on the screen:

• Turn key to preheat & hold

This text is shown only for buses with preheating function.Instruction: The operator shall turn the key switch to preheating position ahold it there.

• Turn key to start & hold

Instruction: The operator shall turn the key switch to start position and holthere.

• Release key

Instruction: The operator shall release the key switch.

2.4.2 Texts shown if time-out has occurred

The following texts are shown on the screen if time-out has occurred:

• Key switch preheat signal is low, VECUPA7

Explanation: The signal from connection PA7 (key switch at preheat position) is too low.

Probable cause: An open circuit.

• Key switch start signal is low, VECUPA6

Explanation: The signal from connection PA6 (key switch at start position) is too low.


• Key switch start or preheat signal is high, VECUPA6, VECUPA7

Explanation: One of the signals from connection PA6 or PA7 (key switch preheat or start position) is too high.

Probable cause: Defective switch.


Sweden

14 Tests

SD

con-

ns onlace.d it inne.

at, is

l) is

2.5 Test of startbutton with preheat or without

In this test VISP checks that the startbutton and the preheating switch isnected to the vehicle control unit.

If the bus is equipped with preheat, the operator receives three instructiothe screen. The first is to turn the feed switch to position C and hold it in pThe second instruction asks the operator to push the start button and holplace. Finally the operator is asked to release the button and the test is do

If the bus is not equipped with preheating the first step, turn key to preheleft out.



• Activate preheat

This text is shown only for buses with preheating function.Instruction: The operator shall turn the feed switch to position C.

• Push start button

Instruction: The operator shall push the start button.

• Release start button

Instruction: The operator shall release the start button.



• Preheat signal is low, VECUPA7

Explanation: The signal on connection PA7 (preheating signal) is low.

Probable cause: A defective switch.

• Start signal is low, VECUPA6

Explanation: The signal on connection PA6 (start signal) is low.


• Preheat or startsignal is high, VECUPA6, VECUPA7

Explanation: The signal on connection PA6 or PA7 (preheat or startsignahigh.



Sweden

Tests 15

SW ProduDept 8064

volt-

at-

2.6 Test of EOL (End Of Line)

This is an automatic test performed by VISP.

The program checks that the EOL connection is not connected to batteryage. The operator does not have to do anything during this test.



• Automatic EOL test

Explanation: VISP checks that the EOL connection is not connected to btery voltage.

2.6.2 Text shown if time-out has occurred

The following text is shown on the screen if time-out has occurred:

• EOL signal is high, VECUPA22

Explanation: The EOL-signal is too high (connection PA22).

Probable cause: The connection is connected to battery voltage.


Sweden

16 Tests

SD

t thepply

olt-

on-ay

on-ay

2.7 Test, voltage of battery

This is a voltage test for 24 V batteries performed by VISP. VISP checks thasupply voltage from the battery to the vehicle control unit is correct. The suvoltage should be between the limit 20-30 V.

The operator does not have to do anything during this test.



• Automatic vecu voltage test

Explanation: VISP checks that the supply voltage to the vehicle control iscorrect.



• Battery voltage is lower than 20 V, VECUPA13, VECUPA12

Explanation: The battery voltage is lower than 20 V, which is the lowest vage limit.

Probable cause: The battery is not giving a correct supply voltage or the ctrol unit is defective. If there is something wrong with the control unit it minterpret the supply voltage as incorrect.

• Battery voltage is higher than 30 V, VECUPA13, VECUPA12

Explanation: The battery voltage is higher than 30 V which is the highestvoltage limit.

Probable cause: The battery is not giving a correct supply voltage or the ctrol unit is defective. If there is something wrong with the control unit it minterpret the supply voltage as incorrect.


Sweden

Tests 17

SW ProduDept 8064

con- lever

is to-. Thern off

.

w.

w.

2.8 Test of cruise control

In this test, VISP checks that the buttons for the cruise control are correctlynected to the vehicle control unit. The cruise control is located on the sameas the signals for indicators and headlight.

The operator receives four instructions on the screen. The first instructionpress the button SET+. The second instruction is to press the button SETthird one tells the operator to press Resume. Finally the operator shall tuthe cruise control.



• Press cruise control set+ & hold

Instruction: The operator shall press down and hold the button SET+.

• Press cruise control set- & hold

Instruction: The operator shall press down and hold the button SET-.

• Press cruise control resume & hold

Instruction: The operator shall press down and hold the button RESUME

• Turn off cruise control

Instruction: The operator shall turn off the cruise control.



• CC: set+ signal is low, VECUPA2

Explanation: The signal on connection PA2 (cruise control SET+) is too lo


• CC: set- signal is low, VECUPA1

Explanation: The signal on connection PA1 (cruise control SET-) is too lo


• CC: Resume or on/off signal is low, VECUPA30, VECUPA3

Explanation: The signal on connection PA30 or PA3 (cruise control RESUME or ON/OFF) is too low.

Probable cause: The error may be caused by an open circuit.

• CC: Resume or on/off signal is high, VECUPA30, VECUPA3

Explanation: The signal on connection PA30 or PA3 (cruise control RESUME or ON/OFF) is too high.

Probable cause: A defective switch or short circuit to voltage.


Sweden

18 Tests

SD

ectly

s to

test:

er)

er)

2.9 Test of windshield wipers and washer

VISP checks that the switch for the windshield wipers and washer, are corrconnected to the vehicle control unit.

Figure 6. The function Wash/Wipe is located at the control lever.

The operator receives instructions on the screen to pull the lever Wash/Wipe.The lever shall be held in position until the operator receives instructionrelease it.



• Pull wash/wipe & hold

Instruction: The operator shall pull the lever for windshield wipers and washer towards one and hold it there.

• Release wash/wipe

Instruction: The operator shall release the lever.


The following texts are shown on the screen if time-out occures during the

• Wash & wipe signal is low, VECUPA11

Explanation: The signal on connection PA11 (windshield wipers and washis too low.


• Wash & wipe signal is high, VECUPA11

Explanation: The signal on connection PA11 (windshield wipers and washis too high.

Probable cause: A defective switch or shortcircuit to voltage.

14XX005


Sweden

Tests 19

SW ProduDept 8064

hicle

or theator

rs

rs.

ld

l

2.10 Test of windshield wiper interval

VISP checks that the interval switch for the windshield wipers, the interval relayand the input signal to the hold circuit are correctly connected to the vecontrol unit.

Figure 7. By moving the lever upwards, the interval for the windshield wipers is activated.

The operator receives instructions on the screen, to activate the interval fwindshield wipers by moving the lever upwards. After a short while the operrecieves instructions to turn off the interval.



• Turn on wiper interval

Instruction: The operator shall activate the interval for the windshield wipeby moving the lever upwards.

• Turn off wiper interval

Instruction: The operator shall turn off the interval for the windshield wipe



• Wiper interval signal is low, VECUPA10

Explanation: The signal on connection PA10 (the interval for the windshiewipers) is too low.


• Interval relay output is low, VECUPB16

Explanation: The signal on connection PB16 (output signal for the intervarelay) is too low.


14XX006


Sweden

20 Tests

SD

• Hold circuit wiper signal is low, VECUPA9

Explanation: The signal on connection PA9 (the hold circuit for the wind-shield wipers) is too low.


• Wiper interval signal is high, VECUPA10

Explanation: The signal on connection PA10 (interval for the windshield wipers) is too high.


• Interval relay output is high, VECUPB16

Explanation: The signal on connection PB16 (output for the interval relay) is too high.


• Hold circuit wiper signal is high, VECUPA9

Explanation: The signal on connection PA9 (hold circuit for the windshieldwipers) is too high.



Sweden

Tests 21

SW ProduDept 8064

ehicle

the

us is

2.11 Test of vehicle speed sensor

This is an automatic test performed by VISP.

The program checks that the vehicle speed sensor is connected to the vcontrol unit. The operator does not have to do anything during this test.



• Automatic vehicle speed sensor test

Explanation: VISP checks the vehicle speed sensor.

2.11.2 Text shown if time-out has occurred

The following text is shown on the screen if time-out has occurred:

• Speed is not zero (PID84>0), VECUPB6, VECUPB20

Explanation: The vehicle’s speed is not zero this means that the value onsignals (connections PB6 and PB20) is not zero.

The vehicle speed sensor receives voltage impulses, even though the bstanding still.


Sweden

22 Tests

SD

to the

firsttion is

low.

or

h.

or

ir-

2.12 Test of accelerator pedal

VISP checks that the accelerator pedal and the idle switch are connectedcontrol unit.

During the test, the operator receives two instructions on the screen. Theinstruction is to press the accelerator pedal to the floor. The second instructo release the accelerator pedal.



• Press accelerator pedal to maximum position

Instruction: The operator shall press the accelerator pedal to the floor.

• Release accelerator pedal

Instruction: The operator shall release the accelerator pedal.


Accelerator pedal and idle switch


• Too low throttle signal (PID91 < 100%), VECUPB8

Explanation: The signal on the connection PB8 (accelerator pedal) is too

Probable cause: The error may be caused by an open circuit.

• Buffered idle switch output (is) signal is low, VECUPB17

Explanation: The signal on connection PB17 (the buffered output signal fidle witch) is too low.


• TOO HIGH THROTTLE SIGNAL (PID91 > 0%), VECUPB8

Explanation: The signal on connection PB8 (accelerator pedal) is too hig


• BUFFERED IDLE SWITCH OUTPUT (IVS) SIGNAL IS HIGH, VECUPB17

Explanation: The signal on connection PB17 (the buffered output signal fthe idle switch) is too high.

Probable cause: The error may be caused by a defective switch or shortccuit to voltage.


Sweden

Tests 23

SW ProduDept 8064

to the

o pull park-

n

2.13 Test of parking brake switch

In this test VISP checks that the switch for the parking brake is connected vehicle control unit.

Two instructions are shown on the screen. The first one tells the operator tthe parking brake. The second instruction tells the operator to release theing brake.



• Pull parking brake & hold

Instruction: The operator shall pull the parking brake and hold it in positiountil next instruction is shown on the screen.

• Release parking brake

Instruction: The operator shall release the parking brake.



• Parking brake signal is low, VECU PB11

Explanation: The signal on connection PB11 (parking brake) is too low.

Probable cause: A defective switch or an incorrect input signal.

• Parking brake signal is high, VECU PB11

Explanation: The signal on connection PB11 (parking brake) is too high.

Probable cause: A defective switch or an incorrect input signal.


Sweden

24 Tests

SD

ECU.

.

2.14 Retarder lever

The retarde lever test checks that the retarder lever is connected to the VReading the status of Ppid 68



• Set retarder lever in OFF position

Instruction: The operator shall set the retarder lever in OFF position.

• Set retarder lever in AUTO position

Instruction: The operator shall set the retarder lever in AUTO position.

• Set retarder lever in position 1

Instruction: The operator shall set the retarder lever in position 1.








The following texts are shown on the screen if timeout has occurred:

• Retarder lever is not in OFF pos, VECU PB24

Explanation: The operator has not set the retarder lever in OFF position.

Probable cause: No connection and shortcuts are detected.

• Retarder lever is not in AUTO pos, VECU PB24

Explanation: The operator has not set the retarder lever in AUTO position


• Retarder lever is not in 1:th pos, VECU PB24

Explanation: The operator has not set the retarder lever in position 1.


• Retarder lever is not in 2:nd pos, VECU PB24



• Retarder lever is not in 3:rd pos, VECU PB24



• Retarder lever is not in 4:th pos, VECU PB24


Sweden

Tests 25

SW ProduDept 8064




Sweden

26 Tests

SD

s con-tor toged to and it

ntil

2.15 Brake pressure switch

The brake pressure switch test checks that the brake pressure switch inected to the VECU. Reading the status of Ppid 85 while asking the operapress he brake pedal to the floor. After that the status of Ppid 85 has chan1 the operator is asked to release it. The status of Ppid 85 is read againshould be 0.



• Press brake pedal & hold

Instruction: The operator press the parking brake and hold it in position unext instruction is shown on the screen.

• Release brake pedal

Instruction: The operator shall release the brake.



• Brake pressure signal low, VECU PB27

Explanation: Incorrect input signal

Probable cause: Faulty switch, no connection and shortcuts are detected.

• Brake pressure signal high, VECU PB27

Explanation: Incorrect input signal

Probable cause: Faulty switch, no connection and shortcuts are detected.


Sweden

Tests 27

SW ProduDept 8064

ted toss he1 theshould

ntil

ere

is an

2.16 Brake pedal switch

The brake pedal switch test checks that the brake pedal switch is connecthe VECU. Reading the status of Ppid 85 while asking the operator to prebrake pedal to the floor. After that the status of Ppid 85 has changed to operator is asked to release it. The status of Ppid 85 is read again and it be 0.



• Press brake pedal & hold

Instruction: The operator press the parking brake and hold it in position unext instruction is shown on the screen.

• Release brake pedal

Instruction: The operator shall release the brake.



• Redundant brake signal is low, VECU PA5

Explanation: The operator has forgot to press down the brake pedal or this an incorrect input signal.

Probable cause: Faulty switch/cable/connector is detected.

• Redundant brake signal is high, VECU PA5

Explanation: The operator has forgot to release the brake pedal or there incorrect input signal.

Probable cause: Faulty switch/cable/connector is detected.


Sweden

28 Tests

SD

ted toss he1 theuld be

t

ere

is an

2.17 Clutch pedal switch

The clutch pedal switch test checks that the clutch pedal switch is connecthe VECU. Reading the status of pid 85 while asking the operator to preclutch pedal to the floor. After that the status of pid 85 has changed to operator is asked to release it. The status of pid 85 is read again and it sho0.



• Press clutch & hold

Instruction: The operator press the clutch and hold it in position until nexinstruction is shown on the screen.

• Release clutch

Instruction: The operator shall release the clutch.



• Clutch signal is low, VECU PA8

Explanation: The operator has forgot to press down the brake pedal or this an incorrect input signal.


• Clutch signal is high, VECU PA8

Explanation: The operator has forgot to release the brake pedal or there incorrect input signal.



Sweden

Tests 29

SW ProduDept 8064

ECUlights

F8

ut

ut

ut

e

The

2.18 Brake light, retarder

The brake light retarder test checks that the brake light output PB1 on the Vis working. Reads the status of Ppid 76. The operator must press F8 if the are on. After that the output PB1 is turned off.



• Brake light test (retarder)

Instruction: VISP ignites the retarder lamp.

• Is the brake light on?

Instruction: The operator must confirm that the lamp is lit. He must pressif the lights are on.



• Not possible to turn on output brake light, VECU PB1

Explanation: VISP can not turn the light on.

Probable cause: No connection and shortcircuits are detected. Faulty outpis detected.

• Not possible to turn off output brake light, VECU PB1

Explanation: VISP can not turn the light off.

Probable cause:No connection and shortcircuits are detected. Faulty outpis detected.

• Not possible to log out

Explanation: VISP can not log out.

Probable cause:No connection and shortcircuits are detected. Faulty outpis detected.

• You have not pressed YES (F8) or NO (F5)

Explanation: The operator has not confirmed.

Probable cause: The operator may have ignored to confirm or he may havbeen to late for time out.

2.18.3 Evaluation results

This is the evaluation result from the test:

• The brake light was not on when activating the brake light (retarder), Pin PB1

No connection and shortcircuits are detected. Faulty output is detected. lamp can be broken.


Sweden

30 Tests

SD

ated.

ct.

2.19 Status Microswitch Clutch, Test

This is a automatic test that checks the clutch´s microswitch when unactivReading the status of Pid 85.



• Status microswitch clutch

Instruction: VISP checks that the status of the microswitch clutch is corre



• Clutch signal is high, VECU PA8

Explanation: Incorrect input signal.


• Clutch signal is low, VECU PA8




Sweden

Tests 31

SW ProduDept 8064

nacti-

ct.

2.20 Status Microswitch Brake, Test

This is a automatic test that checks the brake pedals microswitch when uvated. Reading the status of Ppid85.



• Status microswitch brake

Instruction: VISP checks that the status of the microswitch brake is corre



• Redundant brake signal is high, VECU PA5



• Redundant brake signal is low, VECU PA5




Sweden

Feedback

One of our objectives is that production personnel should have access to correct and appropriate pro-duction manuals.

In order to maintain the high standard of our literature, your opinions and experience when using thismanual would be greatly appreciated.

If you have any comments or suggestions, make a copy of this page, write down your comments andsend them to the address below.

To:

Volvo Bus Corporation

Dept. Software Processes 80 643

S-405 08 Gothenburg

SWEDEN

From:

...........................................................................

...........................................................................

...........................................................................

...........................................................................

...........................................................................

...........................................................................

Comments and proposals concerning manual:

Control Unit, VECU (Vehicle Electronical Control Unit), Issue 2

...............................................................................................................................................................

...............................................................................................................................................................

...............................................................................................................................................................

...............................................................................................................................................................

...............................................................................................................................................................

...............................................................................................................................................................

............................................................................................................................................................. .

................................................................................................................................................. .............


Sweden


Sweden

Documents

VECU - Manual de producción 70312913