8- Steering (EPS )

8/6/2019 8- Steering (EPS )

1/18

ELECTRICAL POWER

STEERING


2/18

COMPONENTS

POWER STEERING CONTROL

MODULE

TORQUE SENSOR

MOTOR ASSEMBLY WITH CLUTCH

VEHICLE SPEED SENSOR


3/18

LOCATION OF COMPONENTS

1. STEERING WHEEL

2. STEERING COLUMN ASSY

3. POWER STEERING

CONTROL MODULE

4. TORQUE SENSOR

5. MOTOR ASSEMBLY WITH

CLUTCH

6. STEERING GEAR BOX

7. BATTERY

8. VSS

9. ECM


4/18

OPERATION

POWER STEERING CONTROL MODULE DETERMINES THE

LEVEL AND DIRECTION OF ASSIST FORCE FOR THE

STEERING WHEEL ACCORDING TO THE SIGNALS FROM

TORQUE SENSOR AND VEHICLE SPEED, RUNS THE

MOTOR TO ASSIST THE TURNING OF THE STEERING

WHEEL


5/18

WIRING DIAGRAM

1

2

3

4

5

6

7

Green color

1. Power Steering

Control Module

2. Motor and

Clutch Assembly

3. Torque Sensor

4. PS fuse (30A)

5. To VSS

6. To ECM

7. Diagnostic

coupler


6/18

DIAGNOSIS OF EPS SYTEMPOWER STEERING CONTROL MODULE DIAGNOSES FAULTS

IN THE FOLLOWING AREAS WHEN THE IGNTION SWITCH IS

ON AND THE ENGINE RUNNING

TORQUE SENSOR

VEHICLE SPEED SENSOR (VSS) CIRCUIT

ENGINE SPEED SIGNAL CIRCUIT

MOTOR ASSEMBLY WITH CLUTCH

POWER STEERING CONTROL MODULE


7/18

ON-BOARD DIAGNOSTIC

SYSTEM P/S CONTROL MODULE

PERFORMS ON-BAORD

DIAGNOSIS OF THE SYSTEM &

OPERATES EPS WARNING LAMPAS FOLLOWS;

EPS WARNING LAMP LIGHTS UP

WHEN THE IGNTION SWITCH IS

TURNED TO ON

POSITION(ENGINE STOPPED) TO

CHECK THE EPS WARNING

LAMP BULB AND ITS CIRCUIT.


8/18

ON-BOARD DIAGNOSTIC

SYSTEM (Contd.)

IF NO TROUBLE IS

DETECTED, THEN THE EPSWARNING LAMP SWITCHES

OFF

WHEN A TROUBLE IS

DETECTED, EPS WARNING

GLOWS


9/18

DTC CHECK

TURN IGNTION SWITCH TO OFF

POSITION.

CONNECT SUZUKI SCAN TOOL TO

DATA LINK CONNECTOR (DLC)

TURN IGNITION SWITCH TO ON

POSITION.

READ DTC FROM THE SCAN TOOL

AFTER CHECKING , TURN IGNTION

SWITCH TO OFF AND DISCONNECT

THE SUZUKI SCAN TOOL FROM DLC


10/18

DTC CLEARANCE


POSITION.

CONNECT SUZUKI SCAN TOOL TO

DATA LINK CONNECTOR (DLC) TURN IGNITION SWITCH TO ON

POSITION.

ERASE DTC USING INSTRUCTIONS

FROM THE SCAN TOOL

AFTER COMPLETING THE CHECK,


POSITION AND DISCONNECT THE

SUZUKI SCAN TOOL FROM DLC


11/18

DISPLAY OF DTC

CURRENT DTC IS

SET

HISTORY DTC IS SET

ONLY ( TROUBLE

OCCURRED IN THE

PAST BUT NORMAL

CONDITION ISRESTORED AT

PRESENT)

CURRENT AND

HISTORY DTC EXIST

EPS WARNING LAMP WITH

ENGINE RUNNING REMAINS ON TURNS OFF REMAINS ON

EPS WARNING LAMP WITH

DIAGNOSIS SWITCH

TERMINAL AND GROUNDTERMINAL SHORTED.

DISPLAYSCURRENT DTC

DISPLAYS HISTORYDTC

DISPLAYS CURRENTAND HISTORY DTC


12/18

PRECAUTIONS IN DIAGNOSIS

ALWAYS NOTE THE DTC INDICATED FIRST

OBSERVE ALL PRECAUTIONS FOR ELECTRICAL SERVICE

WHEN TWO OR MORE TROUBLES HAVE OCCURRED,

THEIR DTCs ARE INDICATED 3 TIMES EACH STARTING

WITH THE SMALLEST CODE NUMBER AND UP

DTC NO. 22 ENGINE SPEED SIGNAL FAILURE IS

INDICATED WITH THE IGNTION ON AND ENGINE NOT

RUNNING. THIS INDICATION CHANGES TO NORMAL CODE

12 WHEN THE ENGINE IS STARTED IF THE EPS SYTEM ISOPERATING NORMALLY

ALL DTC STORES IN MEMORY SHOULD BE CLEARED

AFTER REPAIR.


13/18


14/18

TROUBLE SHOOTING

ON ITION POSSIBLE USESTEERING WHEEL FEELSHE VY

STEERING WHEELINST LLE IMPROPERLYPOOR PERFORM N E OFTORQUE SENSORPOOR PERFORM N E OF

MOTOR N LUT HF ULTY STEERING OLUMN

POOR PERFORM N E OFVSS

VEHI LE PULLS TO ONE SI E WHEEL LIGNMENT

POOR PERFORM N E OFTORQUE SENSOR

POOR RE OVERY FROMTURNS

POOR PERFORM N E OFTORQUE SENSORF ULTY STEERING OLUMN


15/18

STEERING WHEEL PLAY

CHECK STEERING WHEEL PLAY,

WITH VEHICLE IN STRAIGHT

FORWARD CONDITION AND ENGINE

STOPPED

STEERING WHEEL PLAY = 0 -30 MM

IF NOT WITHIN SPECIFICATION CHECK

TIE ROD END BALL STUD FOR WEAR

LOWER BALL JOINT FOR WEAR

STEERING SHAFT JOINT FOR WEAR

STEERING PINION OR RACK GEAR

FOR WEAR


16/18

STEERING FORCE INSPECTION

PLACE VEHICLE ON LEVEL

ROAD

SET STEERING TO STRAIGHT

AHEAD POSITION

CHECK TIRE INFLATION START ENGINE

WITH ENGINE IDLING, MEASURE

FORCE USING TORQUE

WRENCH

STEERING FORCE : LESS THAN 6.4

Nm (0.64KgM)


17/18

MOTOR AND CLUTCH INSPECTION

MOTOR RESISTANCE(G24-2-2 AND G24-2-1)

ABOUT 1 OHM

CLUCTH RESISTANCE

(G24-2-4 AND G24-2-3)

ABOUT 12 OHM (AT 20 DEG C)

Motor and

Clutch Socket

fitted to PS

Module


18/18

THANK YOU

Documents

8- Steering (EPS )