Diagnostic Code Conversion ¹Code Flashed 11 12
CID-FMI No Active Faults No Inactive Faults
Description Not Applicable Not Applicable
13
--
416C
14
--
426C
15
--
428C
16
--
436C
17
--
438C
18
--
BHL
31
641-05
Solenoid 1 Open Circuit
32
642-05
Solenoid 2 Open Circuit
33
643-05
Solenoid 3 Open Circuit
34
644-05
Solenoid 4 Open Circuit
35
645-05
Solenoid 5 Open Circuit
36
646-05
Solenoid 6 Open Circuit
37
683-05
Parking Brake Alarm Relay Open Circuit
41
641-06
Solenoid 1 Short to Ground
42
642-06
Solenoid 2 Short to Ground
43
643-06
Solenoid 3 Short to Ground
44
644-06
Solenoid 4 Short to Ground
45
645-06
Solenoid 5 Short to Ground
46
646-06
Solenoid 6 Short to Ground
47
683-06
Parking Brake Alarm Relay Short to Ground
51
641-03
Solenoid 1 Short to + Battery
52
642-03
Solenoid 2 Short to + Battery
53
643-03
Solenoid 3 Short to + Battery
54
644-03
Solenoid 4 Short to + Battery
55
645-03
Solenoid 5 Short to + Battery
56
646-03
Solenoid 6 Short to + Battery
57
683-03
Parking Brake Alarm Relay Short to Battery
69
668-02
Invalid Shift Lever Input
71
168-00
System Voltage Above Normal
72
168-01
System Voltage Below Normal
73
650-02
Invalide Harness Code
¹Codes given using the Diagnostic Indicator for a specific CID-FMI.
Connector Location Connector Number CONN 1 CONN 2 CONN 3 CONN 4 CONN 5 CONN 6 Code CONN 7 CONN 8 CONN 9 CONN 10 CONN 11 CONN 12 CONN 13 CONN 14 CONN 15 CONN 16 CONN 17 Data Link CONN 18 CONN 19 CONN 20 CONN 21 CONN 22 CONN 23 CONN 24 CONN 25 CONN 26 CONN 27 CONN 28 CONN 29 CONN 30 CONN 31 CONN 32 CONN 33 CONN 34 CONN 35 CONN 36 CONN 37 CONN 38 CONN 39 CONN 40 CONN 41 CONN 42 CONN 43 CONN 44 CONN 45 CONN 46 CONN 47 CONN 48 CONN 49 CONN 50 CONN 51 CONN 52 CONN 53 CONN 54
Schematic Location J-18 L-17 L-17 J-17 J-17 L-15 I-15 I-15 B-14 B-14, L-10 C-14 C-14 C-14 I-14 K-14 K-14 L-15 J-13 J-13 J-13 D-13, K-2 C-13 H-11 D-11 D-11 B-10, K-2 D-10 H-8 H-11 I-9 I-8 K-7 K-7 K-7 J-7 I-7 H-8 F-7 F-7 F-7 E-6 K-5 K-5 E-5 D-5, I-6 D-5, I-6 C-5, I-6 B-5 B-5 C-4 B-3 G-1 G-1 F-17
Machine Location 9 A 9 9 A 4 A G A A A A A A 25 25 4 3 3 3 C C 25 3 3 C 3 A 25 A 1 3 7 3 3 1 A B B B 3 3 3 3 6 6 6 3 6 3 6 8 8 F
The connectors shown in this chart are harness to harness and special use connectors. Connectors which join a harness to a component are generally at or near the component. See the component location chart.
Alarm - Backup Alarm - Lightbar Action Alarm - Stabilizer Leg Alternator Battery 1 Battery 2 Breaker - Running Lamp Coil - Thermostart Control - Powershift Control - Shuttle Flasher Fuses Fuses Fuses Fuses Gauge - AWS Position Gauge - Converter Temperature Gauge - Fuel Level Gauge - Tachometer Ground - Cab, Frame, Engine Ground - Engine Ground - Headliner Ground - Platform Heater - Engine Block Horn - Forward Horn - Rear Lamp - Indicator LED - Service Meter - Service Motor - Blower Motor - Fan Assembly Motor - Front Washer Motor - Front Wiper Motor - Heater Blower Motor - Rear Washer Motor - Rear Wiper Power Port Relay - Accessory Relay - Air Conditioner Relay - Air Cond Shut-off Relay - AWD Brake Relay - Cab Relay - Left Steer Relay - Loader Lock Relay - Main Relay - Parking Brake Relay - Power Seat Relay - Quick Coupler Alarm Relay - Ride Control Relay - Right Steer Relay - Shutoff Relay - Stabilizer Leg Relay - Start Resistor Resistor - Air Conditioning Resistor - Heater Sender - Converter Temperature Sender - Coolant Sender - Fuel Level Sensor - Rear Steer Position Sensor - Return to Dig Sensor - Speed Solenoid - Air Conditioner Clutch Solenoid - Aux. Detent Solenoid - Bucket Position Solenoid - Circle Steer Solenoid - Cold Start Advance Solenoid - Engine Shutdown
D-18 D-16, F-5 I-7 E-3 C-3 D-3 F-10 J-4, E-3 L-12 K-12 F-10 E,F-11 E,F-10 E,F14 K,L-3 L-15 A-15 A-16 B-16 C-3 G-3 B-12 A-14 G-7 B-3 D-18 L-5 L-14 D-14 K-18 E-17 C-3 G-5 E-17 C-3 E-17 D-14 F-9 F-9 I-17 F-9 E-9 K-4 I-9 F-9 K-15 A-15 A-15 G-11, G-6 K-4 J-4 H-14 E-9 H-15 K-17 E-16 I-5, G-4 I-4, E-3 H-5, G-4 J-9 L-18 I-12 J-17 A-5 A-4 L-9 H-5 G-3
Machine Location
Component
1 B B 2 4 4 A 5 4 D B D C C C B A A A 4 6 C 7 2 8 1 B A A 9 3 21 C A 21 10 A D B A D D B A D A F A E B B E D 3 A A 6 12 13 7 14 G 15 16 16 7 12 17
Solenoid - First and Second Gear Solenoid - Front Drive Solenoid - FWD-REV Valve Group Solenoid - Group A Solenoid - Group B Solenoid - Hydraulic Shutoff Solenoid - Left Loader Lock Solenoid - Left Steer Solenoid - Lock Solenoid - Reverse Solenoid - Ride Control Solenoid - Right Loader Lock Solenoid - Right Steer Solenoid - Shutoff Solenoid - Side Shift Lock Starter Switch - Air Conditioner Blower Switch - All Wheel Drive Switch - Aux Rear Flood Switch - Aux. Coupler Switch - AWS Mode Select Switch - AWS Pressure Switch - Backhoe Shutoff Switch - Beacon Switch - Brake A Switch - Brake B Switch - Brake Fluid Level Switch - Cold Start Temperature Switch - Coolant Switch - Coupler Switch - Coupler Detent Switch - Dip Beam Switch - Engine Oil Pressure Switch - Fog Lamp Switch - Front Roading Switch - Front Wiper Switch - Hazard Switch - Head Flood Atch Switch - Head To Flood Lamp Switch - Heater Switch - Horn Switch - Key Start Switch - Loader Float Switch - Loader Rod End Pressure Switch - Loader Xmsn Neutralizer Switch - OROPS Beacon Switch - OROPS Front Roading Switch - OROPS Head To Floods Switch - OROPS Rear Floods Switch - Overdrive Disable Switch - Parking Brake Switch - Rear Floods Switch - Rear Horn Switch - Rear Steer Switch - Rear Wiper Switch - Refrigerant Switch - Return To Dig Switch - Ride Control Switch - Ride Control Switch - Side Shift Switch - Stabilizer Leg Switch - Start Aid Switch - Thermostat Switch - Turn Signal Switch - Washers Switch - Xmsn Neutralizer Switch - Xmsn Neutralizer Lock
Schematic Location H-5 I-5 F-3 J-12 I-12 A-18 I-7 L-9 L-9 I-12 H-9 I-7 L-9 L-9 B-18 D-3 K-16 E-6 H-14 D-6 L-5 K-8 D-17 E-12 D-9 D-9 C-4 H-4 H-4, F-3 D-6 A-15 F-6 H-5, F-3 K-17 G-12 E-12 F-6 H-14 F-12 A-14 C-5 D-14 I-7 E-5 D-5 K-1 L-1 K-1 K-1 J-11 B-8 F-12 A-17 K-7 D-13 J-16 L-16 H-11, L-6 H-9 D-16 B-18 D-15 J-18 F-5 C-13 I-5, D-4 D-6
Machine Location G G G G G 1 18 7 7 G G 19 7 7 1 11 A B C B B 20 A C 27 27 21 12 12 B A B 22 A C C B C C B B B B B E C C C C B A C A E C 23 13 E E A 26 A 9 B C E B
Wire Number
Wire Color
Description
Wire Description Wire Wire Number Color
Power Distribution Circuits
522
WH
A/C Clutch To Thermostat SW
101
RD
Bat (+) (Not Application Specific)
536
WH
Hazard Sw To Turn Sw
102
RD
Running Lamp
537
GN
Turn Signal SW To Flasher
104
YL
Acc Relay Output
552
WH
Four Wheel Drive Sol
105
RD
Key Start Sw
568
GN
Park Brake Alarm Sig
110
RD
Horn Power
569
PK
Tachometer Low Speed Sig
111
YL
Acc Bat Pwr
571
OR
Powershift - Ride Control Relay
112
PU
Main Power Rly Output
578
BU
Washer - Aux
113
OR
Opr Mon Panel VMIS B+ Switched
C511
WH
Air Condition Shutoff Relay
115
RD
Acc Socket Power
C558
YL
Front Wiper Sw Jumper
116
BR
Std Rear Flood Pwr
C559
YL
Rear Wiper Sw Jumper
117
YL
Aux Rear Flood Pwr
C593
OR
Power Seat Relay Control
118
GY
Front Wiper Pwr
C594
YL
Power Seat Motor
119
PK
Rear Wiper Pwr
C595
GN
Power Seat Heater
121
YL
Back Alarm Pwr
122
BU
Heater Pwr
602
RD
Dome Lamp Power
123
WH
XMSN Ctrl Pwr
603
PK
Rotary Beacon
124
GN
A/C
604
OR
Stop Lamp
128
PK
Bucket Position Pwr
605
YL
Turn Lamp - Left
130
GN
Radio Pwr
606
GY
Turn Lamp - Right
136
GN
Suppl Steer Pwr
607
PK
Flood Lamp - Right
140
BU
Blower Pwr
608
GN
Flood Lamp - Rear
143
BR
AWD Pwr
610
OR
Head Lamp Basic
144
GN
Beacon Pwr
611
PU
Head Lamp Hi
157
YL
Aux Front Flood Pwr
614
PU
Park/Tail/Dash/Lamp
161
RD
Flasher Pwr
617
BR
Tail/Position Lamp - Left
170
RD
Radio Memory Pwr
618
YL
Tail/Position Lamp - Right
194
GN
Cab Bat Pwr
619
GN
Headlamp Low
197
GN
Cab Relay Output
620
WH
Flood Lamp - Front (Attach)
198
PK
A/C Relay Output
627
YL
Fog Lamp
630
GY
Flood Lamp Rear (Attach)
634
WH
Head Lmp Sw To Work/Head Lmp Jumper
Ground Circuits 200
BK
Main Chassis
201
BK
Operator Monitor Return
202
BK
XMSN Ctrl
702
OR
Brake Switch B To AWD Relay
217
BK
Start Relay Return
710
GN
XMSN Speed Pickup Signal
218
BK
Drop Valve Relay Return
720
PU
XMSN Brake SW
265
BK
Loader Lock Gnd
752
YL
XMSN Shift Sol 1st And 2nd Gear
270
BK
Loader Lock Gnd
754
BU
XMSN Shift Sol 3rd Gear
276
BK
Pshift Ctrl Harn Code 0
755
OR
XMSN Shift Sol 4th Gear
277
BK
Pshift Ctrl Harn Code 1
762
YL
Bucket Positioner Sol
278
BK
Pshift Ctrl Harn Code 2
766
GN
XMSN Disconnect Sw
279
BK
Pshift Ctrl Harn Code 3
779
WH
Coupler Engage Sol
280
BK
Pshift Ctrl Harn Code 4
C720
BU
XMSN Neutral Lock Sig
281
BK
Pshift Ctrl Harn Code 5
E701
PK
Ride Control
Basic Machine Circuits
E702
OR
Ride Control Sw
Control Circuits
303
BR
Key Sw Acc Position
E764
OR
AWS Circle Steer/Lock Sol
304
WH
Starter Relay Output
F738
WH
Loader Rod End Pressure Sw
306
GN
Starter Relay Coil
F748
WH
Powershift - Ride Control Manual
307
OR
Key Start SW
F765
BR
Park Brake Switch To Relay
308
YL
Key Sw Run Position
G726
GY
AWS Shutoff Sol
309
GY
Alternator Regulator Term
G742
GN
AWS Relay Coil To Diode
310
PU
Start Aid Sol
G743
OR
AWS Relay Coil To Diode
321
BR
Backup Alarm 2
G789
BR
AWS Mode Sw To Press Sw
322
GY
Warning Horn (Forward)
G795
OR
AWS Mode Sw To Rear Steer Sw Power
334
BU
Cold Start Adv Sol
G796
YL
AWS Mode Sw To Rear Steer Sw Gnd
367
BU
Rear Horn
G797
BU
AWS Left Steer Relay Gnd
G798
PU
AWS Right Steer Relay Gnd
Monitoring Circuits 405
GY
Opr Mon Oil Press. (Low Setting)
H767
BR
AWS Circle Steer/ Lock Sol Gnd
406
PU
Opr Mon Coolant Temp
H768
BR
AWS Left Steer Sol Gnd
419
YL
Opr Mon Parking Brake
H769
BR
AWS Right Steer Sol Gnd
429
YL
AWS Position Gauge
H770
BR
AWS Shutoff Sol Gnd
441
OR
Eng Coolant Temp Gauge
H771
BR
Side Shift Lock Sol
443
YL
Converter Temp Gauge
H772
YL
Backhoe Shutoff Sol
D = Operator Compartment - Steering Column Top Panel
447
PK
Fuel Level Gauge
F871
PU
AWS Left Steer Sol
A = Operator Compartment - Right Console
E = Operator Compartment
450
YL
Tach Sender (+)
F872
BU
AWS Right Steer Sol
B = Operator Compartment - Front Console
F = Inside Seat Assembly
483
BR
Opr Mon Brake Fluid Level
F873
YL
Relay Contact To Diode Assembly
C = Operator Compartment - Overhead Console
G = Under Cab Floorplate
F874
PK
AWS Left Steer Relay Control
WH
AWS Right Steer Relay Control
Accessory Circuits
25 16
10 7
9
18 C
E
D
F 1
G
20
27
24
21
22
3
B
11
6
15
17
23
12
5
19
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
416C: 5YN16590-UP 1XR2250-UP
426C: 7WN1100-UP 1ER900-UP 1NR1050-UP 1ZR1000-UP
GN
Wiper - Front (Low)
922
BR
FWD Solenoid Return
OR
Wiper - Front (HI)
923
GY
REV Solenoid Return
503
BR
Wiper - Rear (Park)
944
OR
Data Link + (CAT)
504
YL
Wiper - Rear (Low)
945
BR
Data Link - (CAT)
505
BU
Wiper - Rear (HI)
975
WH
Powershift (-) Sol Return
506
PU
Washer - Front
976
OR
Ride Cont Relay
507
WH
Washer - Rear
991
WH
XMSN Neutral Sw
508
PU
Radio Speaker - Left
C920
GY
Diagnostic Indicator - Powershift
509
WH
Radio Speaker - Left (Common)
C993
WH
Shuttle Control Power
511
BR
Radio Speaker - Right
L998
OR
Aux Hydraulic Sol B
512
GN
Radio Speaker - Right (Common)
L999
GN
Aux Hydraulic Sol C
513
OR
A/C Compressor/Refrigerant Pressure SW
M913
PU
Diode To AWS Indicator Lamp
515
GY
Blower Motor (HI)
M968
BU
Coupler Switch Interconnect
516
GN
Blower Motor (Medium)
N904
PU
Forward High Solenoid
129-4531
Solenoid - Lock
175-3070
Sender - Coolant Temp
113-5320
Solenoid - Right/Left Steer
Blower Motor (Low)
N905
OR
Forward Low Solenoid
Opr A/C Sw To Thermostat/Fuse
N907
GN
Reverse Low Solenoid
521
YL
A/C SW To Refrigerant SW
P909
PK
Autoshift Disable
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.
Printed in U.S.A.
Harness And Wire Electrical Schematic Symbols
Resistor, Sender, and Solenoid Specifications
502
BU
428C: 8RN4990-UP 2CR19310-UP
©2000 Caterpillar All Rights Reserved
501
WH
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
438C: 9KN1200-UP 1JR1150-UP 2DR3250-UP 1TR1550-UP
436C: 9JN1050-UP 1GR950-UP 2BR1000-UP 1RR1100-UP
F877
520
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.
Wiper - Front (Park)
517
Normally closed switch that will open with an increase of a specific condition.
416C, 426C, 428C, 436C, and 438C Backhoe Loader Electrical System
Part No. 3E-1908
Component
Resistance (Ohms)¹
Solenoid - A/C Clutch
17.6 ± 0.6
3E-6184
Resistor
100 ± 5%
3E-8620
Solenoid - Aux Dent
3E-8622
Solenoid - Sideshift Lock Shutoff Valve Group A
4W-9972
Sender - Converter Temp
54°C (130°F) - 560 to 716
Receptacle
Plug
Component Part Number
110°C (230°F) - 72 to 82 8C-5541
Solenoid - LH/RH Loader Lock
54°C (130°F) - 560 to 716
2
110°C (230°F) - 72 to 82 10.5 110°C (230°F) - 72 to 82 8.5
Circle Steer 121-4036
Solenoid - Front Drive
126-3707
Solenoid - Ride Control
128-2875
Sender - Fuel Level
Resistor - A/C
138-1976
Solenoid - Hydraulic
* C-C4* AG-C3 130-6795 130-6795
10.5 2.8 ± 0.3
Full: 134-2885
Wire, Cable, or Harness Assembly Identification
Pin or Socket Number
54°C (130°F) - 560 to 716
240-260
Pin
Overall 1.0 ± 0.1 Tap 0.5 ± 0.05
Heater ¹ At room temperature. C
9X-1123
1
Harness identification code This example indicates wire 32 in harness "L'.
2
200-L32 BK-14
Socket
Single Wire Connector * Harness identification letter(s) and a serializing code. The "C" stands for connector and the number indicates which connector in the harness.
8.15 ± 0.6
L-C12* 3E-5179
AG-C4* 111-7898 325-A135 PK-14
27.5 - 39.5
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 1
10.5
1 2
1 2
Part Numbers For Connector Assembly AG-C4 * 111-7898
32.1
Bucket Pos
Empty:
9
Flow Symbol
Level Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
BR
4
26
Temperature Symbol
Pressure Symbol
500
14
A
T
8
2
Electrical Schematic Symbols And Definitions
Lighting Circuits
Machine locations are repeated for components located close together
13
RENR3529 January 2000
Description
325-L25 PK-14
Schematic Location
Component
Component Location
Circuit Number Identification
Wire Color
Wire Gauge
10 E
D A
26
1
7
G 16
13
6 24
6T-2665 19 18
3 20
Part No.
21
27
F 25
Electrical Schematic Symbols And Definitions
Off Machine Switch Specification B
11
Function Engine Coolant Temperature
5 14 17 22
2
12
114-5333
8 15
Related Electrical Service Manuals
23
Title
4
E84058
Machine Harness Connector And Component Locations
Form Number
Alternator: 105-2812
SENR7508
Power Shift Transmission Control
SENR1274
Starter: 143-0539
SENR3828
128-5091 131-9203
Refrigerant Pressure AWS Pressure Loader Pressure Loader Rod End Pressure
148-6737
Thermostat
Actuate
Deactuate
Contact Position
107.2 ± 2.8ºC
93ºC MIN
Normally
(225 ± 5ºF)
(196ºF MIN)
Open
275 to 1750 kpa¹
--
Normally ²
(40 to 255 psi)
--
Open
551 kPa
344 kPa ± 20 kPa
A-C Normally Closed
(36.3 psi)
(49.9 psi ± 2.9 psi)
A-B Normally Open
3500 kPa MAX
3000 kPa ± 150 kPa
A-C Normally Closed
(508 psi)
(435 psi ± 22 psi)
A-B Normally Open
.25Nm to .43Nm
--
Normally
(.19 lb ft to .32 lb ft)
--
Open
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 condition can be maintained down to 170 kpa (25 psi). ² Contact position at the contacts of the harness connector.
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.
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.