Component Location Component Identifiers (CID¹)

Connector Location
Component Schematic Machine Component Schematic Machine Module Identifier (MID²)
Connector Number
Schematic Machine Location Location Location Location
CID Component SENR6716-02
Location Location Alarm - Action E-5 1 Sensor - Wheel Speed (Right Front) A-2 27
Alarm - Backup D-15 2 Sensor - Wheel Speed (Right Rear) I-11 28 Caterpillar Monitoring System MID 30 August 1997
CONN 1 A-15 4 096 Fuel Level Sensor
CONN 2 Diagnostic Conn B-15 8 Alternator E-13 3 Sensor - WLPMS Lift Cylinder Pressure A-2 29 110 Engine Coolant Temp Sensor
Arc Suppressor (A/C) A-15 4 Sensor - WLPMS Lift Position A-2 30 177 Torque Converter Oil Temp Sensor
CONN 3 D-15 52
Arc Suppressor -(Secondary Steering) A-14 5 Solenoid - 4th Function Diverter Valves (1T38F Only) H-1 31 248 CAT Data Link
CONN 4 D-15 50
Aux Start Recptacle F-14 6 Solenoid - (Pilot Valve Up) Bucket/ForkDetent B-6 C 263 8 Volt Sensor Power Supply
CONN 4A E-15 50
Battery F-15 7 Solenoid - (Pilot Valve Up) Float Detent B-S C 271 Action Alarm
CONN 5 D-15 49 324 Action Lamp
Breaker - Alternator (80A) C-15 8 Solenoid - (Pilot Valve Up) 11ft Detent B-6 C
CONN 5A H-13 49 600 Hydraulic Oil Temp Sensor
Breaker - Blower Motors (15A) C-11 C Solenoid - A/C Clutch A-15 4
CONN 6 E-15 51 Breaker - Main (80A) C-15 8 Solenoid - Engine Shutdown B-15 32 819 Display Data Link
CONN 6A F-15 51 821 9 Volt Display Power Supply
Breaker - Running Lamp (15A) C-15 8 Solenoid - ON/OFF Pilot I-11 33
CONN 7 A-13 52 Breaker - Seat (Air Compressor/Heater) (15A) C-11 C Solenoid - Proportional (Left Front) I-11 38
Autoshift Transmission Control MID 81
CONN 8 E-15 23 168 Electrical System Voltage
Caterpillar Monitoring System E-5 A Solenoid - Proportional (Left Rear) H-11 38 190 Engine RPM Sensor
CONN 9 A-12 21 Control - CST Autoshift E-12 9 Solenoid - Proportional (Right Front) I-11 38 191 Transmission Speed Sensor
CONN 9A B-13 21 Control - Secondary Steering A-14 5 Solenoid - Proportional (Right Rear) H-11 38 248 CAT Data Link
CONN 10 A-11 53 Control - Traction Control System H-12 10 Solenoid - Ride Control (2) B-1 35,36 362 Ride Control Solenoid
CONN 11 A-11 53 Control - WLPCSII E-3 11 Solenoid - Start Aid E-14 37 368 Auto/Manual Switch
CONN 12 B-11 54 Converter F-7 12 Solenoid - Transmission (6) C-12 34 617 Air Inlet Heater Relay
CONN 13 B-11 54 Defroster - (Rear) (COSA Only) F-11 13 Starter F-14 39 621 Downshift Switch
Dimmer E-4 C Switch - 4th Function Diverter (1T38F Only) F-10 C 641 Solenoid 1 (Forward High)
CONN 14 B-10 54 642 Solenoid 2 (Reverse)
CONN 15 Options Code Plug F-12 52 Flasher E-6 A Switch - A/C Hi/Low Pressure A-15 4
643 Solenoid 3 (Forward Low)
CONN 16 Std Harness Code Plug G-11 53 Fuses C-11 C Switch - Auto Ride Control E-7 C 644 Solenoid 4 (Speed 1)
CONN 16A Service Code Plug Fuses C-15 C Switch - Beacon D-10 C 645 Solenoid 4 (Speed 2)
G-11 53 Gauge (Ouad) F-4 A Switch - Blower D-5 A 646 Solenoid 6 (Speed 3)
For Bleeding Brake Oil
CONN 17 Diagnostic Conn H-11 53 Horn - Forward B-1 43 Switch - Brake Oil Pressure C-13 38 650 Harness Code
CONN 18 I-12 56 Intake Air Heater F-13 14 Switch - Bucket Positioner B-1 40 660
thru Shift Handle
CONN 19 I-12 56 Keypad - (WLPCS) C-3 11 Switch - Bucket/Fork Positioner (1T38F Only) F-10 C 668
CONN 20 C-10 C Lamp - Action D-4 B Switch - Defroster (Rear Window)(COSA Only) E-11 C 680 Ride Control Switch
Lamp - Auto Ride Control F-4 B Switch - Detent Lockout B-7 C 687 Options Idenification Code

938F Wheel Loader and

CONN 21 D-10 C
Lamp - Automatic Transmission Mode D-4 B Switch - Dimmer (COSA Only) D-2 C Traction Control System MID 28
CONN 22 D-10 C
Lamp - Defroster (Rear Window)(COSA Only) E-11 B Switch - Disconnect F-14 41 168 Electrical System Voltage
CONN 23 F-10 C
248 CAT Data Link

IT38F Integrated Toolcarrier

Lamp - Flood Indicator D-4 B Switch - Engine Oil A-15 42
CONN 23A F-11 C 263 10 Volt Power Supply
Lamp-Hazard_Flasher F-4 B Switch - Flood Lamp E-11 C
CONN 24 F-11 C 270 Harness Code
Lamp- Hi/Low/Position/Turn (Left Hand) E-1 B Switch - Forward Horn C-6 B 605 Left Front Speed Sensor

Electrical System
CONN 25 B-8 C (COSA Only)
CONN 26 B-7 54 606 Right Front Speed Sensor
Lamp - Hi/Low/Position/Turn (Right Hand) E-1 B Switch - Intake Air Heater E-8 C 607 Left Rear Speed Sensor
CONN 27 D-8 C (COSA Only)
608 Right Rear Speed Sensor
CONN 28 B-7 33 Lamp - Neutra11zer Override D-4 B Switch - Key Start E-9 C 609 Left Front Brake Solenoid
CONN 29 B-7 48 Lamp - Ride Control F-4 B Switch - Kickout Neutra11zer (1T38F Only) F-10 C 610 Right Front Brake Solenoid 938F: IT38F:
CONN 30 D-7 C Lamp - Turn Indicator (Left) F-4 B Switch - Lift Positioner A-1 44 611 Left Rear Brake Solenoid
CONN 31 D-7 C Lamp - Turn Indicator (Left) F-4 B Switch - Neutra11zer C-1 45 612 Right Rear Brake Solenoid 1KM1-UP 5DR1-UP
CONN 32 D-7 C Lamp - Turn Indicator (Right)
Motor - (Secondary Steering)
D-4
A-14
B
5
Switch - Parking Brake
Switch - Primary Steer Pressure
E-12
A-14
46
47
613
615
ON/OFF Solenoid
Articulation Angle Sensor 2RM1-UP 6FN1-UP
CONN 33 D-7 C
CONN 34 D-6 56 Motor - Blower (2) C-3 15 Switch - Primary Steering (Att) B-13 47 616
653
Test/Enable Switch
TCS (ECM) Control
8SM-UP
Motor - Washer (Front) B-13 16 Switch - Running Lamp E-10 C
CONN 35
CONN 36 Harness Code Plug
D-6
F-6
A
A Motor - Washer (Rear) B-13 16 Switch - Secondary Steer Manual D-8 C
687 TCS Options Code Plug
¹ The CID is a diagnostic code that indicates which component is faulty.
7SN1-UP
CONN 37 Service Mode Plug F-5 A Motor - Wiper (Front) B-3 17 Switch - Secondary Steer Pressure A-14 5 ²The MID is a diagnostic code that indicates which electronic control module
Motor - Wiper (Rear) F-10 18 Switch - Secondary Steering (AU) B-13 5 diagnosed the fault.
CONN 38 B-5 54
Relay - Bosch Motor (Secondary Steering) A-14 5 Switch - Start Aid D-8 C
CONN 39 A-2 55
Relay - Start C-15 8 Switch - Start Aid Coolant E-14 22
CONN 39A I-6 55
Resistor - (Blower Motor) C-3 15 Switch-Stop Lamp C-1 45
CONN 39B I-3 55
Resistor - (Intake Air Heater) F-13 14 Switch - Tach/Speedo/Serv Meter Select F-8 C
Failure Mode Identifiers (FMI)¹
CONN 40 A-3 57 Resistor - (Main Relay) C-14 8 Switch - Test/Enable F-8 C FMI No. Failure Description
CONN 40A H-6 57 Resistor - (Starter) F-14 19 Switch - Thermostat (Blower Motor) C-3 15 0 Data valid but above normal operational range.
CONN 40B H-3 57 Sender - Fuel Level D-14 20 Switch - Transmission Auto/Manual D-11 C 1 Data valid but below normal operational range.
CONN 41 A-3 57 Sensor - Articulation MgIe Position I-10 21 Switch - Transmission Downshift B-6 48 2 Data erratic, intermittent, or incorrect.
CONN 41A D-6 57 Sensor - Coolant Temp E-14 22 Switch - Transmission Neutralizer Override E-7 C 3 Voltage above normal or shorted high.
CONN 41B D-3 57 Sensor - Engine Speed C-13 23 Switch -Turn Signal D-6 B 4 Voltage below normal or shorted low.
CONN 42 A-3 57 Sensor - Hydraulic Temp B-14 24 Switch - Wiper (Front Intermittant) E-8 C 5 Current below normal or open circuit.
CONN 42A H-6 57 Sensor - Torque Converter Oil Temp C-13 34 Switch - Wiper (Rear) E-8 C 6 Current above normal or grounded circuit.
CONN 42B H-3 57 Sensor - Transmission Speed C-13 34 Tachometer/Speedometer E-4 A 7 Mechanical system not responding properly.
CONN 43 C-3 15 Sensor - Wheel Speed (Left Front) A-2 25 TCS Display Module B-3 C 8 Abnormal frequency, pulse width, or period.
CONN 44 Customer Data Conn D-3 52 Sensor - Wheel Speed (Left Rear) I-11 26 Transmission Shifter F-3 B 9 Abnormal update.
CONN 45 ECAP Service Conn D-3 52 Machine locations are repeated for components located close together. 10 Abnormal rate of change.
CONN 46 E-3 A A = Operator Compartment - Dash Console 11 Failure mode not identifiable.
B = Operator Compartment - Steering Column
CONN 47 E-3 A C = Operator Compartment - Right Console 12 Bad device or component.
CONN 48 B-2 55 13 Out of calibration.
CONN 49 C-2 59 ¹The FMI is a diagnostic code that indicates what type of failure has occurred. © 1997 Caterpillar Printed in U.S.A.
CONN 49A H-5 59
CONN 49B H-2 59
All Rights Reserved
CONN 49C E-2 59
CONN 50 C-2 58
CONN 50A I-5 58
CONN 50B I-2 58
CONN 50C E-2 58
CONN 51 C-2 45
CONN 52 D-2 C
CONN 52A D-2 C Wire Description Electrical Schematic Symbols And Definitions
CONN 53 F-1 A Wire Wire Wire Wire
CONN 54 F-1 A Off Machine Switch Specification Number Color
Description
Number Color
Description
CONN 55 G-14 60 Part No. Function Actuate Deactuate Contact Position Power Circuits Accessory Circuits (Continued)
4 grams 1.5 grams T
CONN 56 H-14 61 3E-6429 Supplemental Steering Oil Flow Normally Open 101 RD Bat (+) 503 BR Wiper - Rear (Park)
CONN 57 H-14 61 (.14 oz) (.05 oz)
102 BU Hd Lmp 504 YL Wiper - Rear (Low) Pressure Temperature Level Flow Circuit Breaker
38 ± 3°C 27°C MIN Symbol Symbol Symbol
CONN 58 H-14 63 3E-6449 Start Aid Coolant Normally Closed 105 BR KeySw 505 BU Wiper- Rear (Hi) Symbol Symbol
(100 ± 5°F) (60.6°F)
CONN 58A H-15 63 108 BU Aux Ckt 506 PU Washer - Front
1200 kPa MAX 700 ± 100 kPa A-C! Normally Closed
CONN 59 H-14 62 3E-6450 Primary Steering Pressure
(175 psi MAX) (100 ± 15 psi) A-B, Normally Open 109 OR Alt Output (+) Term 507 WH Washer - Rear Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
CONN 60 H-14 62 The circle indicates that the component has screw terminals and a wire can be disconnected from it.
58 90 ± 21 kPa 70 ± 21 kPa A-B, Normally Open 112 PU Main Power Rly Output 508 PU Radio Speaker - Left
CONN 61 I-4 58 3E-6455 Engine Oil Pressure (EMS)
(13 ± 3.0 psi) (10 ± 3.0 psi) A-C, Normally Closed
62 26 6 16 25 113 OR Opr Mon Panel 509 WH Radio Speaker - Left (Commom)
CONN 62 H-2 31 7 46 34 38 Normally closed switch that will open with an increase of a specific condition.
10700 kPa MAX 8960 ± 345 kPa A-B, Normally Open 114 GN Warning Horn (Forward) 511 BR Radio Speaker - Right
36 3E-7693 Brake Oil Pressure (EMS)
CONN 63 C-4 C 41 51 3 22 39 37 44 43 (1550 psi MAX) (1300 ± 50 psi) A-C, Normally Closed No circle indicates that the wire cannot be disconnected from the component.
55 116 BR Aux Ckt 512 GN Radio Speaker - Right (Common)
The connectors shown in this chart are for harness to harness connectors. 19 45 275 to 1750 kPa ¹ -
Connectors that join a harness to a component are generally located at or 14 57 114-5333 Refrigerant Pressure (AC) Normally Open ² 118 GY Aux Ckt 513 OR A/C Compressor/Retriçerant Pressure SW
60 56 (40 to 255 psi) -
near the component. See the Component Location Chart. 63 13 35
120 YL Aux Ckt 515 GY Blower Motor (Hi) This indicates that the component has a wire connected to it that is connected to ground.
2 9 10 12 B A 17 ¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kPa (405 psi), with decreasing pressure the closed
18 40
21 15 condition can be maintained down to 170 kPa (25psi). 121 YL Back Alarm To Lamp 516 GN Blower Motor (Medium)
124 GN A/C 517 BU Blower Motor (Low)
20 42 32 23 1 ² Contact postion at the contacts of the harness connector.
This indicates that the component does not have a wire connected to ground. It is
50 8 24 52 53 48

SENR6716-02
4 30 31 126 PK Xmsn Ctrl 521 YL A/C SW To Refrigerant SW
49
5 33 11 29
127 OR Aux Ckt 522 WH A/C Clutch To Thermostat SW
grounded by being fastened to the machine.
61 28 C 54 27
128 PK Aux Ckt 537 GN Turn Signal SW To Flasher
47 59
129 BU Aux Ott 538 BR Hazard Indicator Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the
Related Electrical Service Manuals
130 GN Aux Ckl A513 PK DC/DC Converter Memory Output contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
Title Form Number Rear Window Defroster
133 OR Aux Ckt A538 OR
Alternator 9W-3043 SENR3685 (Resistive Element In Glass)
135 BU Aux Ckt Lighting Circuits
Caterpillar Monitoring System SENR6717 Sender- A component that is used with a temperature or pressure gauge. The sender
136 GN Suppl Ster 603 PK Rotary Beacon
Payload Monitor SENR4733 measures the temperature or pressure. Its resistance changes to give an indication to
138 GN Auto Lube Pump To Payload Mon 604 OR Stop Lamp T
Starting And Charging Systems SENR2947 the gauge of the temperature or pressure.
Starting Motor: 9X-9995 144 GN Aux Ckt 605 YL Turn Lamp - Left
150 OR Bat (+) 606 GY Turn Lamp - Right
Consist: 3E-2298 SENR3581 Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity.
12 Resistor, Sender and Solenoid Specifications 164 WH Hydra Ctrl WTL Powertrain Ctrl 608 GN Flood Lamp - Rear
8C-4773 SENR3859
106-8558 SENR3559 Part No. Component Description Resistance (Ohms)¹ 167 OR Aux Ckt 610 OR Head Lamp Basic It has a coil that makes an electromagnet when current flows through it. The
Traction Control System SENR5956 188 WH Aux Ckt 611 PU Head Lamp Hi electromagnet can open or close the switch part of the relay.
9G-1950 Resistor - Blower Motor Speed Overall 2.0 ± .1; Tap 1.0 ± 05
Transmission Control SENR5989 13 Ground Circuits 612 GY Backup Lamp
11
6T-7864 Resistor - Main Realy 39 ± 1.95 200 BK Main Chassis 614 PU Park/Tail/Dash/Lamp Solenoid - A solenoid is an electrical component that is activated by electricity. It has a
44 201 BK Operator Monitor Return 615 YL Cab Flood Lamp/Rops coil that makes an electromagnet when current flows through it. The electromagnet
18 B A
22 3E-7842 Resistor - Starter/Diagnostic Conn 150 ± 7.5
63 C 48 56 1 17 30 43 202 BK XMSN Ctrl 617 BR Tail/Position Lamp - Left (Road Pkg)/Width can open or close a valve or move a piece of metal that can do work.
14 37 59 58 40 240 - 260 Empty 203 BK Chassis Diagnostic 619 GN Head Lamp Lo
51 32 15 134-7262 Sender - Fuel Level
19 46 33 27.5 - 39.5 Full 207 BK Starter Diagnostic 661 GN Tachometer Lamp
50 24 9 45
10 54 38
60 3 4 8 53 34 52
3E-8848 Sensor - Engine Speed 1000-1200 250 BK Payload Mon - Customer Ond 662 YL Speedometer Lamp Harness And Wire Symbols
42 39 16 21 251 BK Payload Mon - System Ond 663 GY Gauge Lamps
6 23
5 57 35 36 Sender - Hydraulic Oil Temp, Torque 54°C (130°F)-560 to 716 Component
4W-9972
29 Converter 110°C (230°F) - 72 to 82 270 BK Ident Code 0 Control Circuits Wire, Cable, or Harness Part Number
Monitoring System Modes 2 41
Mode Of Operation Mode Number
31 55
6V-2455 Sensor - Transmission Speed 110 - 200
271 BK Ident Code 1 709 OR Sensor Power Supply
Pin Socket Wire Color Assembly Identification
61 62 49 272 BK Ident Code 2 710 GN XMSN Speed Pickup Signal Fuse
Normal 0
Harness Code 1
20
26 28 25 27 8T-8808 Solenoid - Fourth Function Diverter 34.3 ± 1.7 273 BK Ident Code 3 720 PU XMSN Brake SW A AA 105-9344
7
Numeric Readout 2 274 BK Ident Code 4 727 GN Suppi Ster Motor Relay
47 325-PK-14 1
Service 3 134-3999 Solenoid - A/C Clutch 17.6 ± 0.6 275 BK Ident Code 5 751 GN XMSN Shift Sot No. 1 Or 3
Tattletale (Log) 4 1.55 ± 0.15 290 BK Service 752 YL XMSN Shift Sot No. 2
Units 5
8C-3663 Solenoid - Engine Shutdown
10.3± 1.03 291 BK Clear 754 BU XMSN Shift Sot NO. 3 Or 1 Single Wire Circuit Number Wire Gauge Receptacle
Setup 6 Connector Identification
116-4152 Solenoid - Pilot ON/Off 34.3 ± 1.7 A219 BK Ctrt Gnd 755 OR XMSN Shift Sol No. 4 Or 5
Calibration 7 A221 BK XMSN Ctrl Options Code 0 761 GY Uft Kickout Sot SW
Plug
E10084 Ground 2
6T-8046 Solenoid - Aide Control 20.1 ± 1.0 A222 BK XMSN CIrl Options Code 1 762 YL Bucket Positioner Sot SW Connection 200-BK-14

Machine Harness Connector and Component Locations 3E-6332 Solenoid - Start Aid 6.00
A223 BK Ctrl Harness Code 0 B766 WH Kickouts / Detent Disable SW To Kickouts
Pin or Socket
A224 BK Ctrl Harness Code 1 D743 GN Ride Cont - Wtt tmpt Cont SW To Ond N/O Number
3E-8591 Solenoids - Transmission 29.8 ± 1.5 A225 BK Ctrl Harness Code 2 D744 WH Ride Cont - Wtt tmpi Cont SW To Ond N/C
A226 BK Ctrl Harness Code 3 E701 PK Auto Ride Cntt SW
1 Typical representation of a Deutsch 1 Typical representation of a Sure-Seal
¹ At room temperature unless otherwise noted.
Basic Machine Circuits E702 OR Auto Ride Cntt SW
2 connector. The plug contains all 2 connector. The plug and receptacle
301 BU Starter No.1 Sol E707 GN Display +V sockets and the receptacle contains contain both pins and sockets.
302 OR Starter No. 1 Resistor To Diagnostic E708 PK Display Clock all pins.
304 WH Starter Relay No. 1 Output E735 PU Tack/Serv Mtr/Odometer Select
306 GN Starter Relay Coil To Neut Start SW Or Key SW 818 BR Serial Data (Transmit)
307 OR Key SW To Neut Start SW Or Vmis Sensor Module 819 OY Serial Data (Receive)