PressureSymbol

T

TemperatureSymbol

LevelSymbol

FlowSymbol

Circuit BreakerSymbol

Harness and Wire Symbols

Symbols

Symbols and Definitions

Harness And Wire Electrical Schematic Symbols

Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.

Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it.

Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).No circle indicates that the wire cannot be disconnected from the component.

Ground (Wired): This indicates that the component is connected to a grounded wire. Thegrounded wire is fastened to the machine.

Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.

Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.

Sender: A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.T

Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.

Magnetic Latch Solenoid: A magnetic latch solenoid is an electrical component that is activated by electricity and held latched by a permanent magnet. It has two coils (latch and unlatch)that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.

Solenoid: A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.

12

AG-C4111-7898

L-C123E-5179

9X-1123 Component Part Number

Pin or Socket Number

Part Number: for Connector ReceptaclePart Number: for Connector Plug

Harness Identification Letter(s):(A, B, C, ..., AA, AB, AC, ...)

Plug

325-AG135 PK-14

Wire ColorWire Gauge

Receptacle

1

1

2

2Sure-Seal connector: Typical representationof a Sure-Seal connector. The plug and receptacle contain both pins and sockets.

Deutsch connector: Typical representationof a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.

Fuse (5 Amps)

5A

Harness identification code:This example indicates wire group 325,

wire 135 in harness "AG".

L-C123E-5179

Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).

Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...).

UENR0630-00APRIL 2013

C7.1 Industrial Engine Electrical SystemG9R 1-UP

© 2013 CaterpillarAll Rights Reserved

Printed in U.S.A.

SOLENOID FOR HIGHPRESSURE FUEL PUMP

FUEL TEMPERATURE SENSOR

WASTE GATE REGULATOR

GLOW PLUG CONNECTION

INTAKE MANIFOLD PRESSURE SENSOR INTAKE MANIFOLD TEMPERATURE SENSOR

COOLANT TEMPERATURE SENSOR

OIL PRESSURE SENSORLOCATED UNDER ECM

PRIMERY SPEED/TIMING SENSOR

ELECTRONIC CONTROL MODULEECM

STARTER SOLENOID

STARTER MOTOR

SECONDARY SPEED/TIMINGSENSOR

ALTERNATOR

REFRIGERANT COMPRESSOR

GLOW PLUG CONNECTION

SECONDARY SPEED/TIMING SENSOR

STARTER MOTOR

STARTER SOLENOID

COOLANT SENSOR

SOLENOID FOR HIGHPRESSURE FUEL PUMP

REFRIGERANT COMPRESSOR

ALTERNATOR

PRIMARY SPEED/TIMING SENSOR

INTAKE MANIFOLD TEMPERATURE SENSOR

INTAKE MANIFOLD TEMPERATURE SENSOR

WASTE GATE REGULATOR

ELECTRONIC CONTROL MODULEECM

OIL PRESSURE SENSOR

40

1

HARNESS WITHOUT DIAGNOSTIC CONNECTOR

D

C

B

A JH

E

F

G

DIAGNOSTIC CONNECTOR

64

25

P2

P1

HARNESS SIDE ON J2

ECM SIDE ON J2

1

25

40

64

RAIL PRESSURE SENSOR

Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

THIS SCHEMATIC IS FOR THE C7.1 (G9R) INDUSTRIAL ENGINE ELECTRICAL SYSTEMMEDIA NUMBER: UENR0630-00

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

ABBREVRDWHORYLPKBKGYPUBRGNBU

COLORRED

WHITEORANGEYELLOW

PINKBLACKGRAY

PURPLEBROWNGREENBLUE

SYMBOL DESCRIPTION

BLADE, SPADE, RING OR SCREWTERMINAL

CIRCUIT CONNECTED

CIRCUIT NOT CONNECTED

ELECTRICAL CONNECTION TOMACHINE STRUCTURE

INTERNAL ELECTRICAL CONNECTIONTO SURFACE OF COMPONENT

CONNECTOR

ATCH WIRE, CABLE, COMPONENT

SPLICE

CIRCUIT GROUPING DESIGNATIONH#

SENSOR / ACTUATOR SUPPLY

(+) BATTERY SWITCHED

SIGNAL TO ECM

(+) BATTERY

(-) BATTERY / SENSOR RETURN

STARTING CIRCUIT

CAT DATA LINK

CONTROL (POSITIVE) FROM ECMCONTROL (RETURN) FROM ECM

J1939 DATA LINK

HIGHWAYS

KEYSWITCH WITH SOLENOID ACTIVE STARTER

KEYSWITCH WITH IMS ACTIVE STARTER SEPARATE GROUNDIMS

BATTERY

FUSE

KEYSWITCH

M

50

31

30

BATTERY

FUSE

KEYSWITCH

M

50e

31

30

KEYSWITCH WITH IMS ACTIVE STARTER COMMON GROUND

BATTERY

FUSE

KEYSWITCH

M

50e

31

30

X931-E6 YL-18-GXLX930-E7 GY-18-GXL

X929-E8 BU-18-GXL

966-E10 GN-18-GXL

M795-E17 WH-18-GXL

101-E18 RD-18

945-E20 BR-18944-E21 OR-18

F712-E23 CN-18F711-E24 YL-18Y950-E25 YL-18Y951-E26 PU-18-GXL

X928-E33 GN-18-GXLX927-E34 YL-18-GXLX926-E35 GY-18-GXL

C246-E37 BK-18-GXL

N941-E38 BK-18-GXLN941-E39 BK-18-GXLN940-E40 BU-18-GXL

229-E4 BK-18

Y946-E49 BU-18-GXL

E965-E52 BU-18-GXLP920-E53 BR-18-GXL

R746-E55 BU-18-GXL994-E56 GY-18-GXLX920-E57 BR-18-GXLX921-E58 PK-18-GXL

X922-E59 WH-18-GXL

X925-E62 PK-18-GXLX924-E63 BR-18-GXLX923-E64 OR-18-GXL

229-E4 BK-18944-E21 OR-18

994-E56 GY-18-GXL

945-E20 BR-18966-E10 GN-18-GXL

C246-E37 BK-18-GXL

E965-E52 BU-18-GXL

F712-E23 CN-18

F711-E24 YL-18

M795-E17 WH-18-GXL

N941-E38 BK-18-GXLN941-E39 BK-18-GXL

N940-E40 BU-18-GXL

P920-E53 BR-18-GXLR746-E55 BU-18-GXLX920-E57 BR-18-GXLX921-E58 PK-18-GXLX922-E59 WH-18-GXL

X925-E62 PK-18-GXL

X924-E63 BR-18-GXLX923-E64 OR-18-GXL

X931-E6 YL-18-GXLX930-E7 GY-18-GXLX929-E8 BU-18-GXL

X928-E33 GN-18-GXLX927-E34 YL-18-GXL

X926-E35 GY-18-GXL

Y946-E49 BU-18-GXL

Y950-E25 YL-18Y951-E26 PU-18-GXL

X931-E6 YL-18-GXLX925-E62 PK-18-GXLX930-E7 GY-18-GXLX924-E63 BR-18-GXL

T962-H1 BK-16-GXLT956-H2 BK-16-GXL

E-C12

X929-E8 BU-18-GXLX923-E64 OR-18-GXLX928-E33 GN-18-GXLX922-E59 WH-18-GXL

T961-H3 BK-16-GXL

T955-H4 BK-16-GXL

T960-G1 BK-16-GXLT954-G2 BK-16-GXL

T959-G3 BK-16-GXLT953-G4 BK-16-GXL

X927-E34 YL-18-GXLX921-E58 PK-18-GXLX926-E35 GY-18-GXLX920-E57 BR-18-GXL

T958-F1 BK-16-GXLT959-F1 BK-16-GXL

T957-F3 BK-16-GXL

T951-F4 BK-16-GXL

N874-E22 BK-18

N874-E22 BK-18

E965-E52 BU-18-GXL

P920-E53 BR-18-GXL

M795-E17 WH-18-GXL

C211-E19 BK-18-GXL

C211-E19 BK-18-GXL

C211-E19 BK-18-GXL

995-E43 BU-18

995-E43 BU-18

995-E43 BU-18L731-E66 BK-18-GXL

L731-E68 BK-18-GXL

L731-E66 BK-18-GXL

L731-E68 BK-18-GXL

C967-E42 Bu-18-GXL

C967-E42 BU-18-GXL

C967-E42 BU-18-GXL

N940-E40 BU-18-GXLY946-E49 BU-18-GXL

N941-E48 YL-18-GXL

N941-E48 YL-18-GXL

N941-E48 YL-18-GXL

L730-E47 BR-18-GXL

L730-E47 BR-18-GXL

L730-E47 BR-18-GXLN941-E39 BK-18-GXL994-E56 GY-18-GXL

N940-E46 OR-18-GXL

N940-E46 OR-18-GXL

N940-E46 OR-18-GXL

N941-E38 BK-18-GXLR746-E55 BU-18-GXL

Y950-E25 YL-18

Y951-E26 PU-18-GXL

229-E4 BK-18

N874-E22 BK-18

945-E20 BR-18944-E21 OR-18

F712-E23 CN-18F711-E24 YL-18

AB

D

EFG

C

H

G

J

E-C13

E-C14

Industrial Engine J1 Connections

2

HYDRAULIC FAN SOLENOID +

BATTERY - BATTERY -

AUX TEMPERATURE 1ATTAC TEMPERATURE

BATTERY +BATTERY +

FAN SPEED INPUT

CDL-

FAN SPEED INPUT

BATTERY - 1

3

456

78910

1112

13

14

16 BATTERY +-

--CAN A+

CAN A- CAN A SHIELD

RESERVED

CDL+

17

181920

21222324

2526

27

28

15

RESERVED

RESERVED

ETHER DRIVE 29

30

3132

BATTERY -BATTERY -

BATTERY +

RESERVED

-

RESERVED

ETHER DRIVE RETURNHYDRAULIC FAN SOLENOID -RESERVED

ELECTRONIC CONTROL MODULE (ECM) J2

1

98

76

5

432

1011

1918

171615

141312

20

2122

3029

282726252423

3132

4039

383736353433

4142

5049

484746454443

515253

6160

595857565554

626364

COOLANT TEMP SENSORSIGNAL

GROUND

1

2

CAM SPEED SENSOR1

2

1

2CRANK SPEED SENSOR

A

B

C

GROUND

+5 VOLTS

SIGNAL

1

2

3

4

1

2

3

4

1

2

3

4

ENGINE INJECTOR 6 LS

ENGINE INJECTOR 5 LS

ENGINE INJECTOR 4 LS

CRANK/CAM SPEED SENSOR SUPPLY

SMART WASTEGATE SOLENOID +

DIAGNOSTIC CONNECTOR

CDL-

CDL+

DATA LINKDATA LINK

DIAGNOSTIC CONNECTOR ONLY

PUMP SOLENOIDPUMP SOLENOID RETURN

ENGINE INJECTOR 3 LSENGINE INJECTOR 2 LSENGINE INJECTOR 1 LS

COOLANT TEMP/INTAKE AIR TEMP/AMBIENT TEMP RETURN

INTAKE AIR PRESSURE RETURN

FUEL RAIL PRESSURE RETURN

INTAKE AIR TEMPERATURECOOLANT TEMPERATURE

OIL PRESSURE RETURN

OIL PRESSURE +

INTAKE AIR PRESSURE +

FUEL RAIL PRESSURE +

FUEL RAIL PRESSURE SIGNAL

CRANK/SPEED SIGNALCAM/SPEED SIGNAL

INTAKE AIR PRESSURE SIGNALOIL PRESSURE SIGNAL

ENGINE INJECTOR 3 HS

ENGINE INJECTOR 2 HS

ENGINE INJECTOR 1 HS

ENGINE INJECTOR 4 HS

ENGINE INJECTOR 5 HS

ENGINE INJECTOR 6 HS

101-E18 RD-18

INJECTOR 6

INJECTOR 5

INJECTOR 4

INJECTOR 3

INJECTOR 2

INJECTOR 1

SIGNAL

GROUND

1

2

1

2

3

GROUND

+5 VOLTS

SIGNAL

1

2

3

GROUND

+5 VOLTS

SIGNAL

DIAGNOSTIC CONNECTOR

WASTEGATE

INTAKE MANIFOLD AIR TEMPERATURE SENSOR

FUEL RAIL PRESSURE SENSOR

OIL PRESSURE SENSOR

INTAKE MANIFOLD AIR PRESSURE SENSOR

FUEL PUMP SOLENOID

996-E69 GN-18-GXL

996-E70GN-18-GXL

996-E69 GN-18-GXL

996-E70 GN-18-GXL

E-S2

E-S1

101-E18 RD-18

SEE NOTE A

NOTE A

CATERPILLAR RECOMMEND THAT TWISTED PAIR CABLE AND THE CABLE IS SHIELDED FOR ALL INDUSTRIAL APPLICATIONS.

WATER IN FUEL RETURN

WARNING LAMP

GLOW PLUG RELAY CONTROLAMBIENT AIR TEMPERATURE

PTO ENGAGED INDICATOR LAMP

USER DEFINED SHUTDOWN OR PTO SPEED 1 AND 2 SELECTION

THROTTLE 2 ANALOGUE INPUT

THROTTLE 1 PWM INPUT

MPTS 3 OR PTO SET/LOWER OR INTERMEDIATE SPEED

THROTTLE 2 IVS OR WATER IN FUEL SENSOR

SENSOR 5V SUPPLY PWM THROTTLE SENSOR 8V SUPPLY AND WATER IN FUEL SENSOR POWER

SENSOR 5V SUPPLY

MODE SWITCH 2

THROTTLE 1 IVS

AIR FILTER RESTRICTIONOVERSPEED VERIFY SWITCH

IGNITION SWITCH INPUT

INTERMEDIATE SPEED SWITCH

33

4039

3837

363534

47

4645

44434241

53

52

515049

48

5958

575655

54

SWG RETURNSENSOR 0 RETURN

MODE SWITCH 1

COOLANT LEVEL SWITCH OR THROTTLE ARBITRATION

MPTS 1 OR PTO MODE DISENGAGE

MPTS 2 OR PTO RAISE/RESUME

MPTS 4 OR PTO MODE ON/OFF

THROTTLE 1 ANALOGUE INPUT

MAINTENANCE LAMP

SHUTDOWN LAMP

LOW OIL PRESSURE WARNING LAMP

FAN REVERSING SOLENOID CONTROL

6061

626364

WAIT TO START LAMP