Component Location
0096
Fuel Level Signal
0100
Engine Oil Pressure Signal
0110
Engine Coolant Temperature Signal
0177
Torque Converter Oil Temperature Signal
0248
Cat Data Link
0263
Sensor +8V Supply
0271
Action Alarm
0280
Powertrain Oil Temperature Signal
0324
Action Lamp
0600
Hydraulic Oil Temperature Signal
0819
Data Link Display
0821 Display +9V Supply ¹ The CID is a diagnostic code that indicates which component is faulty. ² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
0
Failure Description Data valid but above normal operational range.
1
Data valid but below normal operational range.
2
Data erratic, intermittent, or incorrect.
3
Voltage above normal or shorted high.
4
Voltage below normal or shorted low.
5
Current below normal or open circuit. Current above normal or grounded circuit. Mechanical system not responding properly.
9
Abnormal frequency, pulse width, or period. Abnormal update.
10
Abnormal rate of change.
11
Failure mode not identifiable.
12
Bad device or component.
13
Out of calibration.
14
Parameter failures.
15
Parameter failures.
16
Parameter not available.
17
Module not responding.
18
Sensor supply fault.
19
Condition not met.
20
Parameter failures.
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Component Seat - Heater / Air
Machine Location 2
Wire Number
CONN 1
Wire Number
Description
Wire Color
Power Circuits
Description Accessory Circuits (Continued)
1
Sender - Fan Coolant Temp
K-9
46
101
RD
Battery (+)
502
OR
Wiper - Front (HI)
I-4
3
Sensor - Coolant Temp
F-5
21
102
RD
Front Flood Power
503
BR
Wiper - Rear (Park)
Aux Start Receptacle
K-4
5
Sensor - Engine Oil Pressure
F-5
46
105
RD
Key Switch Power
504
YL
Wiper - Rear (Low)
Battery
A-4
6
Sensor - Engine Speed
C-7
19
108
BU
Wiper Motor Power
505
BU
Wiper - Rear (HI)
Battery
K-4
6
Sensor - Hydraulic Oil Temp
C-16
25
109
RD
Alt Output (+) Terminal
506
PU
Washer - Front
Breaker - Blower
I-12
7
Sensor - Powertrain Oil Temp
B-6
112
PU
Main Power Relay Output
507
WH
Washer - Rear
Breaker - ECB
I-12
7
Sensor - Transmission Speed
J-17
24 38
113
OR
Monitor Panel Power
508
PU
Radio Speaker - Left
Breaker - Engine
I-12
7
Solenoid - AC Clutch
H-3
28
114
RD
Warning Horn Power
509
WH
Radio Speaker - Left (Common)
Breaker - Floods (Front)
J-12
7
Solenoid - Disable / Winch
E-17
45
116
BR
Rear Flood Power
511
BR
Radio Speaker - Right
Breaker - Implement/Flexaire
I-12
7
Solenoid - Dual Tilt
I-1
29
122
BU
Aux Ckt
512
GN
Radio Speaker - Right (Common)
Breaker - Key
I-12
7
Solenoid - Low Lock / Winch
E-17
45
124
GN
A/C and Blower Power
513
GN
A/C Compressor/Refrigerant Pressure Switch
Electrical Schematic Symbols And Definitions
I-13
7
Solenoid - Quick Drop Valve
H-1
32
125
OR
Side Flood Power
515
GY
Blower Motor (HI)
Breaker - Remote Condenser
I-12
7
Solenoid - Ripper Pin
C-18
33
130
GN
Auxiliary Power
516
GN
Blower Motor (Medium)
Caterpillar Monitoring System
E-14
A
Solenoid - Start Aid
C-7
17
131
RD
CAES/METS Power
517
BU
Blower Motor (Low)
Control - Flexaire Fan
K-10
42
Starter - #1/Prelube
K-3
34
133
OR
Auxiliary Power
519
GN
Thermostat To Refrigerant Press Sw
Converter - 24V to 12V
I-18
B
Starter - #2
A-4
34
134
YL
Auxiliary Power
521
YL
A/C Switch to Refrigerant Switch
Converter - 24V to 12V (15A)
C-17
65
Suppressor - Arc #1
C-18
33
135
RD
Auxiliary Power
522
WH
A/C Clutch to Thermostat Switch
Decelerator Pedal
E-13
10
Suppressor - Arc #2
C-18
33
139
OR
Aux Ckt
523
BR
Wiper - Left (Park)
Dimmer
F-14
A
Suppressor - Arc #3
I-2
4
140
BU
Powertrain Control Power
524
BU
Wiper - Left (Low)
Display - Flexaire Fan
K-9
A
Suppressor - Arc #4
I-1
4
145
PU
Aux Ckt
525
GY
Wiper - Left (HI)
H-12, I-12
7
Suppressor - Arc #5
H-1
32
150
RD
Engine Control Power
526
YL
Wiper - Right (Park)
Gauge Cluster
F-15
A
Switch - A/C High Pressure
H-4
28
158
BR
Remote A/C Condenser Power
527
GN
Wiper - Right (Low)
Horn - High Tone
H-1
12
Switch - A/C Low Pressure
I-3
28
174
PK
Accessory Power
528
PK
Wiper - Right (HI)
Horn - Low Tone
H-1
Switch - A/C On
F-17
A
176
YL
Seat Power
529
WH
Washer Left
Lamp - Low Lock
E-17
12 B
Switch - Accessory
E-13
A
177
RD
Main Breaker Power
530
OR
Washer Right
Lamp - Master Action
F-14
A
Switch - Blower
F-18
A
184
BU
Attachment Power
553
YL
Pitch Solenoid to Trigger Switch - Dual Tilt
Lamp - Rear Master Action
G-18
Switch - Clutch Brake Backup Alarm
J-15
C
186
RD
Power Outlet Power
554
PK
Momentary Sw to Single Tilt Solenoid - Dual Tilt
I-3
B 28
Switch - Clutch Brake Neutral Start
J-15
197
GN
Implement Control Power
567
WH
A/C SW Jumper
A-11
D
Switch - Clutch Brake Odometer Rev
J-15
C C
198
RD
592
BU
DC/DC Converter Output
Module - Intermittent (Left))
B-11
D
Switch - Coolant Flow
F-5
43
Secondary Brake Power Ground Circuits
593
GN
Condenser Fan Relay to Motors
Module - Intermittent (Rear)
C-13
D
Switch - Diff Steer Neutral Start
K-15
200
BK
Main Chassis Ground
A513
PK
DC/DC Converter Memory Output
Module - Intermittent (Right)
A-11
D
Switch - Disable / Winch
E-17
C 45
201
BK
Operator Monitor Return
C568
WH
Blower Motor (MAX)
Motor - Blower
L-17
13
Switch - Disconnect
K-5
35
203
BK
Chassis Ground Diagnostic
E508
PK
Front Wiper Sw To Front Intermittent Module
Motor - Condenser #1
B-18
14
Switch - DS Backup Alarm / Odom Fwd
J-15
C
207
BK
Starter Ground Diagnostic
E509
PU
Front Intermittent Wiper Module to Front Wiper
Motor - Condenser #2
B-18
14
Switch - Flood (Front)
G-13
229
BK
Engine Control Ground
E510
GN
Rear Wiper Switch to Rear Intermittent Module
Motor - Fan / Defrost (Front)
D-12
13
Switch - Flood (Rear)
F-13
A A
270
BK
Cat Mon Sys Ident Code 0
E511
WH
Rear Intermittent Wiper Module to Rear Wiper
Motor - Fan / Defrost (Rear)
C-15
13
Switch - Flood (Side)
F-13
A
271
BK
Cat Mon Sys Ident Code 1
E512
OR
Right Wiper Switch to Right Intermittent Module
Motor - Flexaire Fan Actuator
J-8
44
Switch - Horn
E-18
B
272
BK
Cat Mon Sys Ident Code 2
E513
BR
Right Intermittent Wiper Module to Right Wiper
Motor - Washer (Front)
L-18
15
Switch - Hydraulic Filter Bypass
H-2
36
273
BK
Cat Mon Sys Ident Code 3
E514
YL
Left Wiper Switch to Left Intermittent Module
Motor - Washer (Left)
L-18
15
Switch - Hydraulic Filter Temp
G-2
36
274
BK
Cat Mon Sys Ident Code 4
E515
PK
Left Intermittent Wiper Module to Left Wiper
Motor - Washer (Rear)
L-18
15
Switch - Joystick
E-17
B
275
BK
Cat Mon Sys Ident Code 5
E516
YL
Front Inter. Rly to Front Wiper Motor Park
Motor - Washer (Right)
L-18
15
Switch - Key Switch
F-13
A
290
BK
Cat Mon Sys Service
E517
PU
Rear Inter. Rly to Rear Wiper Motor Park
Motor - Wiper (Front)
A-9
C
Switch - Operator
E-13
A
291
BK
Cat Mon Sys Clear
E518
BU
Right Inter. Rly to Right Wiper Motor Park
Motor - Wiper (Left)
B-9
C
Switch - Pitch Control
H-17
B
E519
GN
Motor - Wiper (Rear)
C-12
C
Switch - Prelube Oil Pressure
J-4
37
301
BU
Starter No. 1 Solenoid
Left Inter. Rly to Left Wiper Motor Park Lighting Circuits
Motor - Wiper (Right)
A-9
C
Switch - PTO Filter Pressure
J-16
38
302
OR
Starter No. 1 Resistor to Diagnostic
600
BR
Dash Lamp Basic
Power Outlet Socket
F-18
B
Switch - PTO Filter Temp
J-17
38
304
WH
Starter Relay No. 1 Output
608
GN
Flood Lamp - Rear
Power Post
G-8
62
Switch - Quick Drop
B-16
39
306
GN
Starter Relay Coil to Neutral Start SW or Key SW
609
YL
Flood Lamp - Side
Radio 12V
C-10
D
Switch - Ripper Pin Puller
E-18
B
307
OR
Key Switch to Neutral Start Switch
610
OR
Flood Lamp - Front
Radio 24V
C-11
D
Switch - Single/Dual Tilt
H-17
B
308
YL
Main Power Relay Coil
630
GY
Flood Lamp - Rear Ripper
Relay - Condenser
B-17
14
Switch - Start Aid
D-11
A
310
PU
Start Aid Switch to Start Aid Solenoid
633
BU
Accessory Power
Relay - Main
H-13
Switch - Temp (Start Aid)
F-5
311
WH
Start Aid Solenoid to Temp Switch
661
GN
Tachometer Lamp - Cat Mon Sys
Switch - Throttle
G-17
21 B
312
PK
Starter No. 2 Solenoid to Resistor
662
YL
Speedometer Lamp - Cat Mon Sys
663
GY
Gauge Lamps - Cat Mon Sys Control Circuits
Basic Machine Circuits
Normally closed switch that will open with an increase of a specific condition.
J-4
Relay - Start #1
H-13
7
Switch - Wiper (Front)
B-14
A
313
GY
Starter No. 2 Resistor to Diagnostic
Relay - Start #2
H-13
7
Switch - Wiper (Left)
B-14
A
314
PU
Starter Relay No. 2 Output
Relay - Wiper (Front)
A-10
D
Switch - Wiper (Rear)
C-14
A
321
BR
Backup Alarm
710
GN
XMSN Speed Pickup Signal
Relay - Wiper (Left)
B-10
D
Switch - Wiper (Right)
A-14
A
322
GY
Warning Horn (Forward)
779
WH
Ripper Pin Engage Solenoid
Relay - Wiper (Rear)
C-13
D
Tachometer
G-15
A
337
WH
780
PU
Ripper Pin Disengage Solenoid
Relay - Wiper (Right)
A-10
D
Thermostat - Refrigerant
L-15
C
Prelube Pushbutton Switch to Prelube Timer Monitoring Circuits
A700
OR
Engine Control Digital Sensor Power (+8V)
Resistor - Blower
L-16
13
Timer - Prelube
I-4
9
403
GN
Alternator (R) Term.
E707
GN
Display +V
Resistor - Starter #1 (Prelube)
K-3
18
Ultrasonic Fuel Level
J-17
40
405
GY
Engine Oil Pressure
E708
PK
SPI Clock
Resistor - Starter #2
B-5
19 Machine locations are repeated for components located close together.
Winch Joystick
E-17
B
410
WH
Action Alarm
E735
PU
Cat Mon Sys Operator Switch
C = Operator Compartment - Left Console
411
PK
Master Action Lamp
E793
BU
ATA Datalink -
A = Operator Compartment - Front Dash B = Operator Compartment - Right Console
D = Operator Compartment - Overhead Console
412
BU
Engine Coolant Flow
E794
YL
ATA Datalink +
E = Operator Compartment
426
BR
Powertrain Oil Filter Differential Pressure
F702
GN
Decelerator Pedal
441
OR
Engine Coolant Temperature
F710
BR
Start Aid Relay
442
GY
Hydraulic Oil Temperature
F715
PU
Throttle Switch (Low Idle)
443
YL
Powertrain Oil Temperature
F716
WH
Throttle Switch (Low Idle Parity)
447
PK
Fuel Level
F717
YL
Throttle Switch (High Idle)
450
YL
Engine Speed
F718
BU
Throttle Switch (High Idle Parity)
499
GY
Hydraulic Oil Filter Differential Pressure
F721
GY
Start Aid Switch
A447
PK
Engine Oil Prelube Pressure Switch
F782
OR
Reverse Sw N.O.
C413
YL
SPI Data
F797
BU
Cat Mon Sys Sensor Power (+8V)
E-18
B
C414
BU
SPI Load Accessory Circuits
G703
GN
Quick Drop Valve
892
BR
CAT Data Link (-)
CONN 2
F-18
CONN 3
H-18
B
500
BR
Wiper - Front (Park)
893
GN
CAT Data Link (+)
CONN 4
J-18
47
501
GN
Wiper - Front (Low)
998
BR
Engine Digital Sensor Return
CONN 5
K-18
48
CONN 6
K-18
48
CONN 7
L-17
15
CONN 8
A-16
15
CONN 9
A-16
45
CONN 10
A-16
14
CONN 11
C-16
2
CONN 12
D-16
16
G-16
61
J-16
38
CONN 15
L-16
15
CONN 16
L-15
60
CONN 17
K-15
15
CONN 18
D-13
A
CONN 19
K-14
C
CONN 20
Monitor Service
CONN 21
Datalink Service
J-13
62
I-13
62
CONN 22
C-13
D
CONN 23
B-13
E
CONN 24
B-13
E
CONN 25
Code Plug
E-12
A
CONN 26
CAES/METS Pwr and Datalink
J-11
7
CONN 27
I-11
50
CONN 28
G-11
50
CONN 29
B-11
E
CONN 30
C-10
A
CONN 31
C-10
A
CONN 32
D-10
A
CONN 33
D-10
A
CONN 34
D-10
17
CONN 35
J-9
46
CONN 36
J-9
46
CONN 37
F-8
50
CONN 38
F-8
50
CONN 39
G-8
50
CONN 40
H-8
50
CONN 41
I-8
50
I-8
50
L-7
62
CONN 42 CONN 43
Starting/Charging Diagnostics
CONN 44
D-7
50
CONN 45
D-7
50
CONN 46
C-7 C-7
50
CONN 48
C-7
50
CONN 49
B-7
51
CONN 50
A-6
63
CONN 51
C-6
63
CONN 52
G-6
11
CONN 53
G-6
9
CONN 54
I-6
9
CONN 55
K-4
5
CONN 56
I-3
54
CONN 57
H-3
28
CONN 58
B-2
55
CONN 59 J-2 64 The connectors shown in this chart are for harness to harness connectors. Connectors that join a harness to a component are generally located at or near the component. See the Component Location Chart.
No circle indicates that the wire cannot be disconnected from the component.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
1
6
42
38
Related Electrical Service Manuals
13 61
47 48
36
5 60
C
18
50
21
2
54
44
A
37
51
31
41 23
17 16
11 43
27 19
8 45
20
26
55
25
14
Actuate
Deactuate
Contact Position
-1.1 ± 0.8°C 2.2 ± 0.8°C Normally Open (30 ± 1.4°F) (36 ± 1.4°F) 38 ± 3°C 27°C MIN 3E-6425 Start Aid Temperature Normally Closed (100 ± 5°F) (81°F MIN) 52 ± 3.0°C 43°C MIN 3E-9350 PTO Filter Temperature Normally Closed (125.6 ± 5.4°F) (109.4°F MIN) 30 ± 7 kPa 30 ± 7 kPa 105-9152 Prelube Oil Pressure Normally Closed (4.4 ± 1 psi) (4.4 ± 1 psi) 275 to 1750 kPa¹ 114-5333 A/C High Pressure Normally Open² (39.9 to 253.8 psi) 25 ± 3°C 15°C MIN 124-8274 Hydraulic Filter Temperature Normally Closed (77 ± 5.4 °F) (59°F MIN) 103.4 ± 13.8 kPa 34.5 ± 7.0 kPa 149-6371 A/C Low Pressure Normally Open (15.0 ± 2.0 psi) (5.0 ± 1.0 psi) 362 ± 29 mN 303 mN MIN 171-8708 Coolant Flow Normally Open (1.3 ± 0.1 oz) (1.1 oz MIN) at point X at point X ¹ With increasing pressure the closed condition can be maintained up to 2800 kPa (406 psi), with decreasing pressure the closed condition can be maintained down to 170 kPa (25 psi). 3E-5464
12
63
Function
D
Flexaire Fan System
RENR3699 SENR2947
Service Mode
15 60
1
48 47
64 55
E
2 40
32
25
13
10
65 49
45
5
7
39
16
44
51
Operator Mode Sequence
0
Harness Code
1
Numeric Readout
2
Service
3
Digital Tattletale
4
Units
5
Charging System Display
6
31
63
23
8
37 26 18
4
46 43
33
29
Component Description
2Q-3371
Sender:
3E-6333
Solenoid:
3E-7842
Resistor:
3E-8575 20
54 22
34
Fan Coolant Temperature
Pin
6.0
24.9 ± 0.4
3E-9205
Solenoid:
Dual Tilt
24.9 ± 0.4
Solenoid:
A/C Clutch
17.6 ± 0.6
107-0677
Solenoid:
Rail Pressure Control Valve
125-9740
Resistor:
Blower Motor
126-0858
Solenoid:
152-8346
Solenoid:
² Letters are stamped near terminals.
Harness identification code This example indicates wire 32 in harness "L'.
2
200-L32 BK-14
Socket
* Harness identification letter(s) and a serializing code. The "C" stands for connector and the number indicates which connector in the harness.
Number
Service Meter
1
Tachometer
2
Engine Oil Pressure
3
Odometer - Machine Travel Distance
4
Scrolling (Diagnostic)
5
Circuit Number Identification
Wire Color
Wire Gauge
Electrical Schematic Symbols And Definitions FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it. 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.
Disable / Winch Low Lock / Winch Quick Drop Valve
Machine Codes Machine
150 ± 7.5
106-5122
¹ At room temperature unless otherwise noted.
Machine Harness Connector And Component Locations
73 ± 7 @ 90°C (194°F)
Solenoid:
9 66
1
Single Wire Connector
Resistance (Ohms)¹
Start Aid Starter #1 Prelube Diagnostic Starter #2 Diagnostic Ripper Pin
3
21
19
Part No.
41
30
52
35
53
24
28
325-A135 PK-14
Resistor, Sender and Solenoid Specifications
11
17 62
12
36
50
6
38
27
Number
L-C12* 3E-5179
AG-C4* 111-7898
9X-1123
Monitoring System Operator Modes
A
42
* C-C4* AG-C3 130-6795 130-6795
Monitoring System Service Modes
Operator Mode
B
Wire, Cable, or Harness Assembly Identification
Pin or Socket Number
Refrigerant Thermostat
61
14
Component Part Number
2
SENR3860
Starting and Charging System
² Contact position at the contacts of the harness connector
C
Receptacle
Plug
SENR7508
RENR2014
Off Machine Switch Specification Part No.
165-5140 167-7812 6V-0513 6V-0928 123-8686
Caterpillar Monitoring System
32
28
39 24
33
29
Form Number
34SI Alternator: 50MT Starting Motor:
10
B
4
52
7
D
Title
64
30 3
53
34
E 40
22
9
46
49
65
66
35
62
Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
L-C12 * 3E-5179
AG-C4 * 111-7898
1 2
1 2
Part Numbers For Connector Assembly
1
50
CONN 47
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Harness And Wire Electrical Schematic Symbols
Machine Location
CONN 14
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
This indicates that the component has a wire connected to it that is connected to ground.
Relay - Prelube
15
Flow Symbol
Level Symbol
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
7 66
B
Temperature Symbol
Pressure Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Schematic Location
CONN 13
T
Breaker - Main
Connector Location Connector Number
Wire Color
K-17
Module - Intermittent (Front)
7
Wire Description Schematic Location H-17
Alternator
Module - Air Conditioner
6 8
Alarm - Backup
Fuse Block
Failure Mode Identifiers (FMI)¹ FMI No.
Alarm - Action
Machine Location 2
Component
Component
CID
Schematic Location F-18
325-L25 PK-14
Component Identifiers (CID¹) Caterpillar Monitoring System (MID² 030)
10.1 ²A-C: 2.00 ± 0.10 B-C: 1.00 ± 0.05 C-D: 0.36 ± 0.02 39.3 32.6 ± 1.6
Code
D9R Differential Steer (Mechanical Engine)
39
D9R Clutch / Brake (Mechanical Engine)
40
T
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. 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. CIRCUIT BREAKER (C/B) - A component in an electrical circuit that will open the circuit if too much current flows through it. This does not destroy the circuit breaker and it can be reset to become part of the circuit again. 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.