Electrical Schematic Symbols And Definitions RENR7943 Related Electrical Service Manuals

October 2002 Title Form Number

Electrical Troubleshooting Guide RENR2238
P1 T Systems Operation Testing and Adjusting RENR2307

Pressure Temperature Level Flow Circuit Breaker

Symbol Symbol Symbol
Symbol Symbol

Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
160-7690
Normally closed switch that will open with an increase of a specific condition.
No circle indicates that the wire cannot be disconnected from the component.

This indicates that the component has a wire connected to it that is connected to ground. Diagnostic Code Listing
P2 Flash Flash
PID-FMI Description PID-FMI Description
Codes Codes
0-00 No Detected Faults 55 105-03 Inlet Air Temp Sensor Open Circuit 38
This indicates that the component does not have a wire connected to ground. It is 1-11 Cylinder 1 Fault 72 105-04 Inlet Air Temp Sensor Short Circuit 38
grounded by being fastened to the machine. 2-11 Cylinder 2 Fault 72 105-11 Very High Intake Manifold Temp Warning 64
3-11 Cylinder 3 Fault 73 108-03 Atmospheric Pressure Sensor Open Circuit 26
4-11 Cylinder 4 Fault 73 108-04 Atmospheric Pressure Sensor Short Circuit 26
5-11 Cylinder 5 Fault 74 110-00 High Coolant Temp Warning 61
Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the 6-11 Cylinder 6 Fault 74 110-03 Coolant Temp Sensor Open Circuit 27
3E-8969 contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch. 22-11 Cam Sensor to Crank Sensor Calibration 42 110-04 Coolant Temp Sensor Short Circuit 27
22-13 Check Timing Sensor Calibration 42 110-11 Very High Coolant Temp Warning 61
30-08 Invalid PTO Throttle Signal 29 111-01 Low Coolant Level Warning 62
30-13 PTO Throttle Sensor Calibration 29 111-02 Coolant Level Sensor Fault 12
Sender- A component that is used with a temperature or pressure gauge. The sender 41-03 8 Volt Supply Above Normal 21 111-11 Very Low Coolant Level 62
1 2 3 4 5 6
J300 measures the temperature or pressure. Its resistance changes to give an indication to 41-04 8 Volt Supply Below Normal 21 121-05 Retarder Solenoid Lo/Hi Open Circuit 14
T the gauge of the temperature or pressure. 43-02 Ignition Key Switch Fault 71 121-06 Retarder Solenoid Lo/Hi Short Circuit 14

C-16 and C-18 Truck Engine 52-11 Air Inlet Shutoff Shutdown 00 122-05 Retarder Solenoid Med/Hi Open Circuit 14
12 11 10 9 8 7

54-05 Multi-Function Output #6 Open Circuit 66 122-06 Retarder Solenoid Med/Hi Short Circuit 14
54-06 Multi-Function Output #6 Short Circuit 66 168-02 Low or Intermittent Battery Power to ECM 51
Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity. 55-05 Multi-Function Output #7 Open Circuit 67 171-03 Outside Air Temp Sensor Open Circuit 00

155-2252
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. Electrical System 55-06
64-12
71-00
Multi-Function Output #7 Short Circuit
Loss of Engine Cam Sensor RPM Signal
Idle Shutdown Override
67
34
01
171-04
171-11
174-00
Outside Air Temp Sensor Short Circuit
No Ambient Air Temp Data
High Fuel Temp Warning
00
00
65
71-01 Idle Shutdown Occurrence 47 174-03 Fuel Temp Sensor Open Circuit 13
71-14 PTO Shutdown Occurrence 47 174-04 Fuel Temp Sensor Short Circuit 13
12 11 10 9 8 7 Solenoid - A solenoid is an electrical component that is activated by electricity. It has a W1A1-UP 84-00 Vehicle Overspeed Warning 41 190-00 Engine Overspeed Warning 35
84-01 Loss of Vehicle Speed Signal 31 190-12 Loss of Engine Crank Sensor RPM Signal 34
P300 coil that makes an electromagnet when current flows through it. The electromagnet MDP1-UP 84-02 Invalid Vehicle Speed Signal 36 191-07 Transmission Not Responding 68
can open or close a valve or move a piece of metal that can do work. MEP1-UP 84-08 Vehicle Speed Out of Range 36 224-11 Theft Deterrent Enabled 00
84-10 Vehicle Speed Rate of Change 36 224-14 Emergency Cranking With Theft Deterrent Enabled 00
1 2 3 4 5 6 84-14 Quick Stop Occurrence 00 231-02 J1939 Required Data Not Received 58
91-08 Invalid Throttle Signal 32 231-12 J1939 Device Not Responding 58
Harness And Wire Symbols 91-13
100-01
Throttle Sensor Calibration
Low Oil Pressure Warning
28
46
232-03 5 Volt Supply Above Normal 21
232-04 5 Volt Supply Below Normal 21

3E-3370 155-2267
Component 100-03 Oil Pressure Sensor Open Circuit 24 246-11 Brake Switch #1 Fault 00
Wire, Cable, or Harness Part Number 100-04 Oil Pressure Sensor Short Circuit 24 247-11 Brake Switch #2 Fault 00
100-11 Very Low Oil Pressure 46 249-11 J1922 Data Link Fault 58
Pin Socket Wire Color Assembly Identification 102-00 Boost Pressure Sensor Stuck High 25 252-11 Incorrect Engine Software 59
Fuse 102-03 Boost Pressure Sensor Open Circuit 25 253-02 Check Customer or System Parameters 56
B A
J200 P201
P203 A B A AA 105-9344 102-04 Boost Pressure Sensor Short Circuit 25 253-11 Check Transmission Customer Parameters 56
105-00 High Inlet Air Temp Warning 64
C 325-PK-14 1
C

Single Wire Circuit Number Wire Gauge Receptacle

155-2269
Connector Identification
ALL PINOUTS ARE FACE VIEWS OF THE CONNECTORS
Plug
Ground 2
P100 Connection 200-BK-14
D
P103 E
P105 C
P401 2 1 Pin or Socket
P402 Number F A B

J
G
1 Typical representation of a Deutsch 1 Typical representation of a Sure-Seal H

2 connector. The plug contains all 2 connector. The plug and receptacle
sockets and the receptacle contains contain both pins and sockets.
all pins. DIAGNOSTIC CONNECTORS

2002 Caterpillar Printed in U.S.A.

All Rights Reserved

RENR7943-00
 ENGINE HARNESS WIRING DIAGRAM RETARDER
SOLENOID
MED/HI

A701 GY-16 RETARDER

A702 PU-16 SOLENOID
A703 BR-16 MED/HI
A704 GN-16 INJECTOR
A705 BU-16 RETARDER HARNESS
CONNECTOR
SOLENOID A701 GY-18
LO/HI J300 P300 A702 PU-18 P2
NO.1 NO.2 NO.3 NO.4 NO.5 1552252 1607690
3E8969 A703 BR-18 ELECTRONIC CONTROL MODULE
CYLINDER CYLINDER CYLINDER CYLINDER CYLINDER
INJECTOR NO.6 A701 GY-16 1 A701 GY-18 A704 GN-18 1
INJECTOR INJECTOR INJECTOR INJECTOR
CYLINDER A702 PU-16 2 A702 PU-18 A705 BU-18 G828 WH-18 2 PRESSURE SENSOR +5V
INJECTOR A703 BR-16 3 A703 BR-18 A706 GY-18 G829 LTGN-18 3 PRESSURE SENSOR COMMON
A704 GN-16 4 A704 GN-18 J700 BR-18 4
A705 BU-16 5 A705 BU-18 J701 LTGN-18 5
D789 WH-16 D790 OR-16
A706 GY-16 A706 GY-16 6 A706 GY-18 J702 BK-18 1

6
D791 YL-16 D788 BK-16 7 J702 BK-18 L983 WH-18 7
D791 YL-16 D791 YL-16 8 L985 YL-18 L984 OR-18 8
D787 GN-16 9 J701 LTGN-18 L985 YL-18 J702 BK-18 9 RETARDER SOLENOID COMMON
D790 OR-16 D790 OR-16 10 L984 OR-18 J700 BR-18 10 RETARDER SOLENOID MED/HI
D786 BR-16 11 J700 BR-18 NOTE P J701 LTGN-18 11 RETARDER SOLENOID LOW/HI
D789 WH-16 D789 WH-16 12 L983 WH-18 12
13
A747 GY-18 14 ATMOSPHERIC PRESSURE
15
16
17
P201 G833 PK-18 18 TEMPERATURE SENSOR COMMON
1552267 19
(+) BATTERY SUPPLY WIRES
+5V A G828 WH-18 20
ENGINE OIL PRESSURE SENSOR
INPUT SIGNAL WIRES TO ECM 161-1705 GROUND B G829 LTGN-18 21
SIGNAL C 994 GY-18 22
OUTPUT SIGNAL WIRES FROM ECM 23
994 GY-18 24 OIL PRESSURE
SENSOR SUPPLY VOLTAGE P203 A746 PK-18 25
1552267 A747 GY-18 26
SIGNAL PLUS +5V A G828 WH-18 A751 YL-18 27
ATMOSPHERIC PRESSURE SENSOR
161-1703 GROUND B G829 LTGN-18 28
SIGNAL MINUS SIGNAL C A747 GY-18 G828 WH-18 29
G828 WH-18 30
(-) BATTERY / SENSOR RETURN P105 G828 WH-18 31
1552269 G828 WH-18 995 LTBU-18 32 COOLANT TEMPERATURE
FUEL TEMPERATURE SENSOR SIGNAL 1 A751 YL-18 A751 YL-18 33 FUEL TEMPERATURE
130-9811 GROUND 2 G833 PK-18 34
G829 LTGN-18 C967 LTBU-18 35 INLET AIR TEMPERATURE
Wire Colors J200 G829 LTGN-18 1

A701 GY-18 36 INJECTOR CYL 1

ABBREV COLOR 3E3370 G829 LTGN-18 A702 PU-18 37 INJECTOR CYL 2
RD RED +5V OR-18 A G828 WH-18 G829 LTGN-18 A703 BR-18 38 INJECTOR CYL 3
BOOST PRESSURE SENSOR
WH WHITE GROUND YL-18 B G829 LTGN-18 A704 GN-18 39 INJECTOR CYL 4
194-6724
OR ORANGE SIGNAL GN-18 C A746 PK-18 A746 PK-18 40 BOOST PRESSURE
YL YELLOW G833 PK-18 41
PK PINK P103 G833 PK-18 1

42
BK BLACK 1552269 G833 PK-18 43
GY GRAY INLET AIR TEMPERATURE SENSOR SIGNAL 1 C967 LTBU-18 G833 PK-18 L983 WH-18 44 INJECTOR COMMON CYL 1&2
PU PURPLE 130-9811 GROUND 2 G833 PK-18 L984 OR-18 45 INJECTOR COMMON CYL 3&4
BR BROWN C967 LTBU-18 L985 YL-18 46 INJECTOR COMMON CYL 5&6
GN GREEN P100 994 GY-18 47
1552269 995 LTBU-18 E964 WH-18 48 CRANKSHAFT POSITION (+)
LTGN LIGHT
GREEN ENGINE COOLANT TEMPERATURE SENSOR SIGNAL 1 995 LTBU-18 E963 BK-18 E963 BK-18 49 CRANKSHAFT POSITION (-)
130-9811 GROUND 2 G833 PK-18 E964 WH-18 50
BU BLUE
E965 LTBU-18 51
LIGHT P401 E966 YL-18 52
LTBU BLUE 1552269
NOTE P 53
CRANKSHAFT POSITION SENSOR SIGNAL (-) 1 E963 BK-18 A705 BU-18 54 INJECTOR CYL 5
189-9266 SIGNAL (+) 2 E964 WH-18 A706 GY-18 55 INJECTOR CYL 6
56
P402 57
1552269 E966 YL-18 58 CAMSHAFT POSITION (+)
CAMSHAFT POSITION SENSOR SIGNAL (-) 1 1 E965 LTBU-18 E965 LTBU-18 59 CAMSHAFT POSITION (-)
188-7513 SIGNAL (+) 2 2 E966 YL-18 60
61
62
63
64
65
NOTE C: "SINGLE" WINDING MAGNETIC PICKUP SENSOR RECOMMENDED. NOTE J: ENGINE BLOCK MUST HAVE A DIRECT WIRE CONNECTION NOTE P: THE ENGINE HARNESS IS SHIELDED 66
NOTE E: THE ECM SPEEDOMETER AND TACHOMETER OUTPUT SIGNAL LINE TO BATTERY(-). THIS CONNECTION CAN BE MADE AT THE WITH STAINLESS STEEL BRAID ON S/N MDP AND MEP ENGINES. 67
VOLTAGES ARE ZERO-CROSSING SQUARE WAVES. THE SPEEDOMETER STARTER(-) TERMINAL OR MAINFRAME GROUND LUG 68
SIGNALS AT J1-37 AND J1-36 ARE COMPLEMENTS OF EACH OTHER. 69
THE TACHOMETER SIGNALS AT J1-38 AND J1-39 ARE COMPLEMENTS NOTE L: SENSOR COMMON CONNECTION FOR INPUTS #1 THROUGH #8
70 ECM GND STRAP
OF EACH OTHER. FOR SPEEDOMETERS WITH A SINGLE SIGNAL INPUT AND #11 MAY BE MADE TO EITHER J1-5 OR J1-18
TERMINAL, EITHER ONE OF THE TWO SIGNAL OUTPUT LINES FROM J1-18 IS FOR BODY BUILDER/AFTERMARKET INSTALLATIONS
THE ECM MAY BE USED.
NOTE M: J1939 DATA LINKS MUST BE PROGRAMMED FOR ECM TO
NOTE F: AN ELECTRONIC SIGNAL MAY BE PROVIDED IN PLACE OF A PASSIVE INTERACT ON DATA LINK, J1939 MUST NOT BE PROGRAMMED UNLESS USED
MAGNETIC SENSOR, THE ELECTRONIC SIGNAL INPUT WILL BE IF PROGRAMMED WITHOUT PROPER CONNECTION A DIAGNOSTIC TO ECM
CONNECTED TO THE +SIGNAL PIN. CODE WILL RESULT MOUNTING
BOLT

TYPICAL OEM VEHICLE HARNESS WIRING DIAGRAM

CIRCUITS WITHIN THIS AREA ARE RECOMMENDATIONS

TO +BATTERY
N/O
RELAY
TO VEHICLE
COMPONENTS CHECK ENGINE LAMP L994-YL
OFF C L994-YL 28 CHECK ENGINE LAMP
B ON WARNING LAMP 659-PK WARNING LAMP
S 659-PK 29
K998-BU 30 OUTPUT #1
START G880-PK 31 OUTPUT #9
R J906-BR 70 IGNITION KEY SWITCH
409-OR 62 PARK / NEUTRAL INTERLOCK
KEY SWITCH G882-WH 64 INPUT #13
G C974-PU 15
S PARK/NEUTRAL SPEEDOMETER SIGNAL+ C974-PU 36 SPEEDOMETER POSITIVE
INTERLOCK SWITCH NOTE E C973-GN
BAT MTR SIGNAL- C973-GN 37 SPEEDOMETER NEGATIVE
TO +BATTERY E718-PK 10 OUTPUT #2
ALTERNATOR E991-GY 12 OUTPUT #3
GROUND STARTER OFF POSITION G836-WH 13 OUTPUT #4
MOTOR 16
(12V)
TACHOMETER 450-YL 43
SIGNAL+ 450-YL 38 TACHOMETER POSITIVE
NOTE E
SIGNAL- 451-BR 451-BR 39 TACHOMETER NEGATIVE
CAB DIAGNOSTIC TOOL CONNECTOR G837-YL 11 OUTPUT #5
9 PIN CAB G838-BR 19 OUTPUT #6
CONNECTOR G839-BU 20 OUTPUT #7
COOLING FAN SOLENOID
+BAT. B G840-PU 21 OUTPUT #8
-12V+ -12V+ -12V+ -BAT. A 48
J 1
H 14
BATTERY 3 BATTERY 2 BATTERY 1 J1939 SHIELD E A249-BK A249-BK 42 J1939 DATA LINK SHIELD (NOTE M)
J1939 - D K990-GN K990-GN 34 J1939 DATA LINK NEGATIVE (NOTE M)
J1939 + C K900-YL K900-YL 50 J1939 DATA LINK POSITIVE (NOTE M)
NOTE J J1587 - G E793-BU E793-BU 9 J1587 DATA LINK NEGATIVE
J1587 + F E794-YL E794-YL 8 J1587 DATA LINK POSITIVE
51
ENGINE 55
BLOCK 14 AWG GXL 101-RD 52 UNSWITCHED +BATTERY
14 AWG GXL 101-RD
20A 53 UNSWITCHED +BATTERY
14 AWG GXL 229-BK 65 -BATTERY
14 AWG GXL 229-BK 67 -BATTERY
G933-YL 27 INPUT #9
C453-YL 26 INPUT #10
SET/RESUME SWITCH 993-BR 3 INPUT SENSOR COMMON #2
F713-OR 17 INPUT #14
C978-BR C978-BR 35 SET
H795-PK C979-OR RESUME
C979-OR 44
CRUISE CONTROL ON/OFF SWITCH K999-GN 56 INPUT #1 (NOTE L)
K980-PK 58 INPUT #2 (NOTE L)
H795-PK C975-WH C975-WH 59 CRUISE CONTROL ON/OFF SWITCH
K982-YL 60 INPUT #3 (NOTE L)
SERVICE BRAKE PEDAL POSITION SWITCH N/C G841-GN 7 INPUT #4 (NOTE L)
H795-PK C992-PU C992-PU 45 SERVICE BRAKE PEDAL POSITION SWITCH
(PEDAL RELEASED POSITION) L901-GY 18 INPUT SENSOR COMMON #1
G842-GY 47 INPUT #5 (NOTE L)
CLUTCH PEDAL POSITION SWITCH N/C G843-OR 6 INPUT #6 (NOTE L)
G844-PK 46 INPUT #7 (NOTE L)
H795-PK C977-BU C977-BU 22 CLUTCH PEDAL POSITION SWITCH
(PEDAL RELEASED POSITION) 57
LO
E716-GY E716-GY 23 RETARDER SOLENOID LOW/HI SWITCH
MED
H795-PK ENGINE RETARDER G879-OR 2 +5V
HI
SOLENOID SELECTOR SWITCH C983-WH 49 ENGINE COOLANT LEVEL NORMAL
ENGINE RETARDER LO
C984-YL 54 ENGINE COOLANT LEVEL LOW
SOLENOID MED
E717-GN E717-GN 40 RETARDER SOLENOID MED/HI SWITCH
A/C HIGH PRESSURE SWITCH ON/OFF SWITCH HI
N/C 61
63
H795-PK E971-GN E971-GN 41 INPUT #11 (NOTE L)
G834-PU 24 INPUT #15 POSITIVE
RENR7943-00

PASSIVE G835-OR 25 INPUT #15 NEGATIVE

NOTE C MAGNETIC G808-BU 1 G808-BU 32 VEHICLE SPEED IN POSITIVE (NOTE F)
NOTE F VEHICLE SPEED G809-GN 2 G809-GN 33 VEHICLE SPEED IN NEGATIVE
SENSOR 69
G845-PU 68 INPUT #8 (NOTE L)
ACCELERATOR PEDAL SENSOR/SWITCH SENSOR COMMON BK B H795-PK H795-PK 5 ACCELERATOR PEDAL SENSOR/SWITCH SENSOR COMMON
+8 V RD A C985-BU C985-BU 4 +8V
ACCELERATOR PEDAL POSITION WH C C986-BR C986-BR 66 ACCELERATOR PEDAL POSITION
ACCELERATOR PEDAL POSITION SENSOR J403 P403 P1 J1
ALL SWITCHES ARE SHOWN IN THE OFF POSITION
UNLESS OTHERWISE SPECIFIED: ELECTRONIC CONTROL MODULE (ECM)
ALL WIRES TO BE 18 AWG OR LARGER SAE J1128 TYPE SXL VEHICLE HARNESS CONNECTOR
OR EQUIVALENT. FOR TWISTED PAIR SPECIFICATION SEE SAE J1708

Left Side View

Electronic Inlet
Unit Air
Injector Temperature Engine
Connector Sensor Ground
Boost Stud
Pressure
Sensor

Camshaft
Position
Sensor
Engine
Control
Module
(ECM)

OEM
Vehicle
Harness
Connector
J1/P1

Engine
Harness
Connector
J2/P2

Crankshaft
Position
Sensor Atmospheric Oil
Pressure Pressure
Sensor Sensor

Coolant
Temperature
Sensor

Inlet
Air
Temperature
Sensor

Fuel
Temperature
Sensor

Front Top View