KENR8848 January 2010
Wire Description Wire Number
Description
Wire Color
Lighting Circuits Continued
101
RD
Bat (+) (Not Application Specific)
608
GN
102
RD
Head Lamp
610
OR
Head Lamp - Basic
103
RD
Power Batt (+) - Unswitched
611
PU
Head Lamp - High
104
YL
Auxilary Circuit
614
PU
Park/Tail/Dash/Lamp
105
RD
Key Switch
617
BR
Tail/Position Lamp - Left (Road Package)
106
WH
Auxilary Circuit
618
YL
Tail/Position Lamp - Right (Road Package)
111
YL
Rear Horn Relay
619
GN
Head Lamp - Low
620
WH
Flood Lamp - Front Fog Lamp
112
PU
PRM Module #1
115
RD
ACC Power Port
627
YL
116
BR
Rear Flood Lamp
630
GY
117
YL
Rear Flood Lamp (ATCH)
118
GY
Front Wiper
702
OR
AWD Switch to LH Brake Sw
119
PK
Rear Wiper
708
YL
XMSN Lock Switch
122
BU
Heater/AC Switch
720
PU
XMSN Brake Switch to AWD Relay
123
WH
Quick Coupler
751
GN
XMSN Speed Clutch Solenoid No. 1
124
GN
A/C Compressor
752
YL
XMSN Forward Low Solenoid
125
OR
Product Link
754
BU
XMSN Reverse Solenoid
126
PK
Laser Grade Check
762
YL
Bucket Positioner Solenoid Switch
133
OR
Advisory Display
766
GN
XMSN Disconnect Solenoid
136
GN
Differential Lock Relay
774
YL
Implement Disable Relay
143
BR
Ride Control Relay
779
WH
Coupler Engage Solenoid
144
GN
Beacon
C704
GY
Shuttle Forward Sw
146
GY
PRM Module #1
C707
PK
Shuttle Reverse Sw
157
YL
Front Flood Lamp (ATCH)
C720
BU
XMSN Lock Switch Parking Brake
158
BR
Front Flood Lamp
C743
PK
BU
Aux Ckt
E701
PK
Auto Ride Control Switch
161
RD
Aux Ckt
E727
BU
Diode - Parking Brake Relay
180
GN
Operator Seat
F711
GN
CAN Link + (J1939)
Ground Circuits
F712
GY
CAN Link - (J1939)
200
BK
Main Chassis
F738
WH
Active Ride Control Switch (N.C.)
202
BK
Ground Control
F739
GN
Active Ride Control Switch (N.O.)
207
BK
Starter Diagnostic
F748
WH
Ride Control Switch
218
BK
Start Relay
G703
GN
Load Check On
225
BK
Hydro Solenoid To Sensor
G760
WH
XMSN Speed Switch 2
265
BK
Electronic Pump Control
G761
YL
XMSN Speed Switch 3
A250
BK
MSS Indicator (Return)
G762
BR
XMSN Speed Switch 4
G763
PU
XMSN Neutral Switch
304
WH
Starter Relay No. 1 Output
G768
GN
XMSN Control Speed Switch 1
306
GN
Starter Relay Coil Or Key Switch
G795
OR
AWS Mode Switch To Rear Steer Switch
307
OR
Key Switch To VMIS Sensor Module
H705
BR
Pump Relay
308
BK
Main Power Relay Coil
H707
YL
Impl Cont Pump Torque Solenoid
309
GY
Alternator Regulator Terminal
H730
BR
Reverse Output - Shuttle Control
310
PU
Start Aid Switch To Start Aid Solenoid
H731
GY
Forward Output - Shuttle Control
320
OR
Horn Relay Coil To Switch
H764
GY
Rear Steering Position Sensor
321
BR
Backup Alarm Lamp Travel Alarm
H768
BR
AWS Solenoid Ground 2
322
GY
Warning Horn (Forward)
H769
BR
AWS Solenoid Ground 3
324
BU
Differential Lock Solenoid
H770
BR
AWS Solenoid Ground
327
PK
Shutdown Solenoid
H771
BR
Side Shift Lock Solenoid
331
OR
Backup Alarm Relay Coil
J764
BR
Switch/Sensor Return (8v)
WH
Stick Extend Solenoid +
Basic Machine Circuits
3 14
D 13 16
1
9
10
15
6 7
2
333
GN
Scraper Key Switch 'R' Terminal
K764
367
BU
Warning Horn - Rear
K766
PK
Stick Retract Solenoid +
384
BU
Relay To Glow Plugs
L740
BR
Analog Sensor Return (+5V)
A305
YL
Horn Power From Relay
M719
GN
Sideshift Left Switch
A346
BU
MSS Start Relay Interrupt
M720
BU
Sideshift Left Relay
A347
GN
Diode Ass’y - Start Relay Interrupt (MSS)
M721
WH
Sideshift Right Switch
P789
PK
Alarm Horn Output
GY
Pattern Change Solenoid On
Monitoring Circuits 403
GN
Alternator (R) Terminal
R762
404
YL
Opr Mon Hydraulic Oil Temperature
R763
BU
Pattern Change Solenoid Return
GY
Opr Mon Oil Pressure (Low)
U763
BU
Circle Drive Control (Signal)
406
PU
Opr Mon Coolant Temp
X750
OR
Fwd/Rev Solenoid Return From Controller
420
OR
Opr Mon Fuel Filter/Low Accum Pressure
852
GN
Continuous Flow Sw - NO to Ground
432
PK
Opr Mon Brake Pressure (Oil)
892
BR
VMIS Start Mod Right (-) Port/CDL (-)
439
YL
Water In Fuel Sensor
893
GN
VMIS Start Mod Right (+) Port/CDL (+)
441
OR
Engine Coolant Temp Gage
A884
WH
AWS Diode to Differential Lock Relay
442
GY
Hydraulic System Temperature Gage
E803
YL
Right Ind Steer Solenoid
BU
Left Ind Steer Solenoid
405
447
PK
Fuel Level Gage
E804
450
YL
Tach Sender (+)
E885
OR
AWS Parity Signal
452
PU
Torque Converter
F846
PU
MSS Indicator LED Driver #1 (Red)
E455
BR
Hydraulic Oil Filter
G848
GN
MSS Indicator LED Driver #2
E479
YL
Overload Warning Press Switch
X800
OR
+8V Sensor Power
F420
GN
Warning Lamp (General)
900
PU
XMSN Shift Sol No. 5 Or 4
F443
GN
Stability Warning Press Sw Out
902
BR
XMSN Shift Sol No. 7
F444
PU
Stability Warning Sw to Press Sw
903
GY
XMSN Shift Sol No. 8
G423
PK
High Pressure Implement Filter - Rear
911
YL
AWD Mode Switch Jumper
922
BR
XMSN Forward Solenoid Return
Accessory Circuits
14 16
10
9 7
A
13 6
17 1
15
3
500
BR
Wiper - Front (Park)
923
GY
XMSN Reverse Solenoid Return
501
GN
Wiper - Front (Low)
973
BR
CST Autoshift- Auto/Manual Switch 2
502
OR
Wiper - Front (Hi)
975
WH
CST Autoshift- Sol Return
503
BR
Wiper - Rear (Park)
976
OR
Ride Control Solenoid #1
506
PU
Washer - Front
977
YL
CST Autoshift- Auto/Manual Switch #1
507
WH
Washer - Rear
985
GY
Crab Steer Solenoid
508
PU
Radio Speaker - Left
E900
WH
ECPC Trans Output Speed +
509
WH
Radio Speaker - Left (Commom)
E901
GN
ECPC Trans Output Speed -
WH
Implement Lockout Switch To Ground (N.O.)
511
BR
Radio Speaker - Right
E917
512
GN
Radio Speaker - Right (Common)
E918
GN
Implement Lockout Switch To Ground (N.C.)
513
OR
A/C Compressor/Refrigerant Pressure Sw.
E991
GY
Multi-Function Output #3
515
GY
Blower Motor (HI)
G962
OR
Implement Lockout Solenoid / Diode
516
GN
Blower Motor (MEDIUM)
G981
PU
Travel Alarm Disable
517
BU
Blower Motor (Low)
L998
OR
Auxiliary Hydraulic Solenoid B
518
OR
Hazard Flasher To Switch
L999
GN
Auxiliary Hydraulic Solenoid C
521
YL
A/C Switch To Refrigerant Switch
M936
BR
Flow Control Switch
WH
A/C Clutch To Thermostat Switch
M937
GN
Flow Control Prox Sw #1
537
GN
Turn Signal Switch To Flasher
M952
BU
LH Joystick
552
WH
Four Wheel Drive Solenoid
M965
GN
RH Joystick
564
GY
Rear Wiper Interrupt Switch To Wiper Sw.
M968
BU
Coupler Switch Interconnect
568
GN
Park Brake Warning Buzzer
M969
YL
Coupler Switch Interconnect
522
B D 2
MACHINE CONNECTOR AND COMPONENT LOCATIONS
Flood Lamp Rear (ATCH) Control Circuits
159
B
17
Flood Lamp - Rear
569
PK
A/C Switch Jumper #2
N939
GN
Ride Control Solenoid #2 (On)
578
BU
Auxiliary Washer
N945
OR
AWD Sw to AWD Relay
585
YL
Aux Hydraulic - Open
N957
PK
RS-232 RXD - COMM #1
OR
RS-232 TXD - COMM #1
586
BR
Aux Hydraulic - Closed
N960
590
GY
Intermittent Wiper
N970
YL
RS-232 DTR - COMM #1
C511
WH
Relay Power
N973
BR
RS-232 DCD - COMM #1
C568
WH
Blower Motor
N979
GN
RS-232 Signal Ground - COMM #1
E528
PU
HVAC On/Off Switch To Blower Switch
N997
WH
PWM - Freq In #1
E529
YL
Blower Switch Jumper
P993
OR
Auxiliary Hydraulic Select
E540
PK
Aux Hydraulic Interlock
R912
OR
Hydraulic Pedal Lock Solenoid
E543
WH
Aux Hydraulic Return Solenoid - Close
T904
BU
RH Stabilizer Up - Switch To Solenoid
E544
GN
Aux Hydraulic Return Solenoid - Open
T907
GN
LH Stabilizer Down - Switch To Solenoid
Lighting Circuits
T969
YL
Aux Circuit 1
601
GY
Dash Lamp (Hi)
T970
GY
Stick Extend Solenoid (+)
603
PK
Rotary Beacon
T971
OR
Aux Circuit 3
604
OR
Stop Lamp
T972
GN
Stick Extend Solenoid (+)
605
YL
Turn Lamp - Left
X977
YL
Fuel Pump +V Supply
606
GY
Turn Lamp - Right
607
PK
Flood Lamp - Front
432E, 434E, 442E, and 444E Backhoe Loader Electrical System 432E: JBA1-UP
434E: SJL1-UP
442E: EME1-UP
444E: NBA1-UP
Volume 1 of 2: Cab and Chassis © 2010 Caterpillar, All Rights Reserved
Printed in U.S.A.
Harness And Wire Electrical Schematic Symbols Symbols
T
Pressure Symbol
Temperature Symbol
Level Symbol
Circuit Breaker Symbol
Flow Symbol
Symbols and Definitions 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. The grounded 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. 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. 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.
Harness and Wire Symbols Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
L-C12 3E-5179
AG-C4 111-7898
L-C12 3E-5179
Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...).
1
Part Number: for Connector Plug
Part Number: for Connector Receptacle
2 Plug
Receptacle Pin or Socket Number
1 2
Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
1 2
Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
5A Component Part Number
9X-1123
Fuse (5 Amps)
325-AG135 PK-14 Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".
Wire Gauge Wire Color
Component Location Volume 1 Schematic Location
Machine Location
Schematic Location
Machine Location
Alarm - Action
C-14
B
Solenoid - (1) Hoe Aux Valve 2
F-14
10
Cluster - Gauge
D-14
B
Solenoid - (2) Hoe Aux Valve 2
F-14
10
Control FNR Automatic
F-8
A
Switch - Auto Manual
F-7
A
Control - FNR Manual
G-8
A
Switch - AWD
H-7
A
Control - Machine
I-6
7
Switch - AWD (Italy)
H-7
A
Diode - Fuel Lift Pump
C-4
D
Switch - Beacon
D-13
B
Component
Connector Location Volume 1 Schematic Location
Machine Location
CONN 1
D-14
B
CONN 2
F-13, G-13
1
CONN 3
G-12
1
Connector Number
CONN 5
H-12
1
CONN 6
B-11
B
CONN 7
B-11
B
CONN 8
B-11
B
CONN 9
C-11
B
CONN 10
C-11
B
CONN 11
D-11
3
CONN 12
E-11
3
CONN 13
E-11
3
CONN 14
D-8
D
CONN 15
B-7
6
CONN 16
C-7
2
CONN 17
C-4
6
CONN 18
B-4
6
CONN 19
B-4
6
CONN 21
F-13, G-13
6
CONN 22
G-12
6
CONN 23
G-12
7
CONN 24
H-1
7
CONN 25
H-1
7
CONN 26
I-1
6
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.
Component
Ground - Control
D-6
6
Switch - Brake (LH)
H-8
A
Ground - Lower Cab
D-6
6
Switch - Brake (RH)
H-8
A
Handle - Machine Right
F-13
17
Switch - Column Multi Function
E-8
A
Loader Joystick
B-7
B
Switch - Continuous Flow 7-8
E-13
B
Loader Joystick Base
C-7
B
Switch - Control Pattern
I-8
17
Module - PRM 1
I-3
D
Switch - Differential Lock
H-8
16
Module - PRM 2
I-3
D
Switch - Front Work Lamp (ATCH)
D-13
B
Module - PRM (HVAC)
I-2
D
Switch - Hazard
E-8
A
Motor - Seat Group
F-1
13
Switch - Implement Lockout
B-12
B
E-11
B
Switch - Key
C-14
B
Port - Power 1 Port - Power 2
I-8
14
Switch - Loader Lock
G-7
A
Relay - AWD
F-3
D
Switch - neutral xmsn handle
F-1
B
Relay - Backup Alarm
G-3
D
Switch - Park Brake
D-11
B
Relay - Differential Lock
D-3
D
Switch - Power Side Shift
E-14
B
Relay - Flasher
I-1
D
Switch - Pressure (Hyd Oil Filter Bypass)
G-1
9
Relay - Fuel Lift Pump
C-3
D
Switch - Rear Fog Lamp
C-13
B
Relay - Horn (Fwd)
G-3
D
Switch - Rear Wiper
C-13
B
Relay - Horn (Rear)
G-3
D
Switch - Rear Work Lamp (ATCH)
D-13
B
Relay - Implement Disable
D-3
D
Switch - Ride Control
G-7
A
Relay - Neutral Start
C-3
D
Switch - Ride Control (LL)
G-7
A
Relay - Ride Control
F-3
D
Switch - Roading
F-7
A
I-12
D
Switch - Side Shift Lock
E-13
B
Relay - Torque Limiter
I-1
D
Switch - Start Aid
C-13
B
Resistor - CAN Terminating 1
C-8
D
Switch - STD Front Work Lamp
E-14
B
Resistor - CAN Terminating 2
G-13
D
Switch - STD Rear Work Lamp
E-14
B
Sensor - Temperature (Hydraulic Oil)
G-1
9
Switch - Transmisson Lock
H-7
A
Relay - Stabilizer Timer
(ATCH)
Valve - Stabilizer Machine locations are repeated for components located close together. A = Located inside front console. B = Located inside right console. D = Located in or near relay panel.
(ATCH)
I-14
10
Component Identifiers (CID¹) Module Identifier (MID²) Machine ECM (MID No. 039) CID
Component
Failure Mode Identifiers (FMI)¹ FMI No.
Failure Description
0
Data valid but above normal operational range.
1
Data valid but below normal operational range.
2
Data erratic, intermittent, or incorrect. Voltage above normal or shorted high.
0041
8 VDC Sensor Power Supply
3
0168
Electrical System Voltage
4
Voltage below normal or shorted low.
0247
SAE J1939 Data Link
5
Current below normal or open circuit.
0262
5 Volt Sensor Power Supply
6
Current above normal or grounded circuit.
0367
Ride Control Switch
7
Mechanical system not responding properly.
0368
Transmission Auto/Manual Switch
8
Abnormal frequency, pulse width, or period.
0490
Implement Lockout Switch
9
Abnormal update.
0600
Hydraulic Oil Temperature Sensor
10
Abnormal rate of change.
0626
Neutral Trans Lock Switch
11
Failure mode not identifiable.
0629
Neutralizer Switch
12
Bad device or component.
0702
FNR Lever Diagnostics
13
Out of calibration.
1251
Alternator R-Terminal Signal
14
Parameter failures.
1401
Transmission Solenoid 1
15
Parameter failures.
1402
Transmission Solenoid 2
16
Parameter not available.
1403
Transmission Solenoid 3
17
Module not responding.
1404
Transmission Solenoid 4
18
Sensor supply fault.
1405
Transmission Solenoid 5
19
Condition not met.
1406
Transmission Solenoid 6
20
Parameter failures.
1529
Implement Front Aux Quick Coupler Flow Switch
2236
Hoe Aux Valve #1 Port A Solenoid
2237
Hoe Aux Valve #1 Port B Solenoid
2242
Loader Aux Valve Port A Solenoid
2243
Loader Aux Valve Port B Solenoid
2244
Hoe Aux Valve #2 Port A Solenoid
2245
Hoe Aux Valve #2 Port B Solenoid
2529
Implement Front Aux Slide 1 Sensor
2530
Left Joystick Slider
2531
Right Joystick Slider
2735
Implement Front Aux Continuous Flow Switch
2736
Implement Rear Aux Continuous Flow Switch
Related Electrical Service Manuals Title 143-0539
SENR3828
Machine Troubleshooting:
KENR8849
Engine Troubleshooting:
SENR9969
Resistor, Sender and Solenoid Specifications Part No. 134-2540
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Form Number
Electric Starting Motor:
Component Description Resistor:
Resistance (Ohms)¹
CAN Terminating
120 54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82
244-3106
Sender:
Coolant Temperature
4W-9972
Sender:
Converter Temperature
321-1327
Sender:
Fuel Level (EST)
303-2933
Sender:
Fuel Level (Non-EST)
54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82 Empty - 246-252 Full - 27-33 Empty - 246-252 Full - 27-33
¹ At room temperature unless otherwise noted.
Event Codes Machine ECM EID 43
Off Machine Switch Specification
Description Low System Voltage Warning
50
High System Voltage Warning
¹ The CID is a diagnostic code that indicates which circuit is faulty.
153
High Speed Direction Shift
² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
232
High Fuel/Water Separator Water Level
282
Implement Hydraulic Oil Filter Restricted
391
Air Filter Restriction
627
Machine Driven with Parking Brake On
797
Dash Brake Boost Low Pressure
861
Machine Synchronize Clock Manual Alignment
878
High Hydraulic Oil Temperature
979
Stabilizer Raised While Transmission in Gear
Part No. 311-7711
Function
Actuate
Boosted Brake Pressure
3000 kPa MAX @ -40 C (435.1 psi) to +121 C
Deactuate 2387 ± .345 kPa @ -40 C (346 ± 0.05 psi) to +121 C
Contact Position Normally Closed
(Dimensions: 48 inches x 35 inches)
Power Circuits
A
Description
36 Page,
Wire Color
KENR8848 VOL 1 of 2
Wire Number