HEAD GP-PUMP 3666195 - Caterpillar

Table 1
J1939 Code and Description CDL Code Description Comments
678-3
ECU 8 Volts DC Supply : Voltage Above Normal 41-3
8 VDC Supply : Voltage Above Normal The code is logged.
678-4
ECU 8 Volts DC Supply : Voltage Below Normal 41-4
8 VDC Supply : Voltage Below Normal The code is logged.
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal 262-3
5 Volt Sensor DC Power Supply : Voltage Above Normal The code is logged.
All sensors are set to default values.
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal 262-4
5 Volt Sensor DC Power Supply : Voltage Below Normal The code is logged.
All sensors are set to default values.
3510-3
Sensor Supply Voltage 2 : Voltage Above Normal 2131-3
5 Volt Sensor DC Power Supply #2 : Voltage Above Normal The code is logged.
Engine power may be derated.
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal 2131-4
5 Volt Sensor DC Power Supply #2 : Voltage Below Normal The code is logged.
Engine power may be derated.
Table 2
Sensor Supply Sensor Supply Electronic Control Module (ECM) Location
Sensor Supply #1 Sensors on the A6:E2 ECM J2 connector
Sensor Supply #2 Sensors on the A6:E2 ECM J1 connector Note: Refer to the latest revision of the Electrical Schematic for the complete schematic for your application.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
B. Turn the keyswitch to ON.
C. Determine if a diagnostic trouble code is present.
Codes
Result: A -3 or -4 code is present.
Proceed to Test Step 2.
2. Check for a Failed Sensor
A. Connect to Cat ET.
B. Turn the keyswitch to ON.
C. Disconnect a sensor on the suspect sensor supply circuit.
D. Monitor Cat ET while the sensor is disconnected to see if the active code changes to logged.
E. Connect the suspect sensor to the wiring harness
F. Repeat steps C through E for each sensor on the suspect sensor supply.
Sensor
Result: The suspect sensor supply active code changes to logged when a sensor is unplugged.
Repair: Replace the failed sensor.
Verify that the repair resolved the problem.
Result: The suspect sensor supply active code remains active after all sensors on the sensor supply circuit have been checked.
Repair: A failed wiring harness has been detected. Repair or replace the wiring harness.
Verify that the repair resolved the problem.
If this procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solution Network (DSN).