LINES GP-BUCKET 2759068 - Caterpillar

Illustration 1 g06302034
For the complete circuit details, refer to the full schematic.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 2.
2. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: Any of the following codes are active or logged:
- 29-4
Proceed to Test Step 3.
Result: Any of the following codes are active or logged:
- 29-3
- 974-6
Proceed to Test Step 7.
Result: A 974–5 code is active or logged:
Proceed to Test Step 9.
3. Check the Wiring for an Open Circuit
A. Ensure that the engine control is in the OFF/RESET position. Ensure that the electrical power is removed from the engine and the speed control device.
B. Disconnect the C-C1 connector from the ECM Box.
C. Disconnect the FA-C3 connector from the ECM.
D. Measure the resistance between the following terminals:
- For the 29-4 code, terminal 94 of the FA-C3 ECM connector and terminal 15 of the FA-C4 connector.
Open Circuit
Result: The resistance measured less than 10 ohms.
Proceed to Test Step 4.
Result: The resistance measured more than 10 ohms.
Repair: An open circuit has been detected. Repair or replace the wiring harness.
4. Check the Wiring for a Short Circuit to Engine Ground
A. Measure the resistance between the ground strap for the ECM and the following terminals at the ECM connector.
- For the 29-4 code, terminal 94 of the FA-C3 ECM connector
Short Circuit
Results: The resistance measured more than 100k ohms.
The signal wire is not shorted to the engine ground.
Proceed to Test Step 5.
Results: The resistance measured less than 100k ohms.
The signal wire is shorted to the engine ground.
Repair: Repair or replace the wiring harness.
5. Check the Wiring Harness for a Pin to Pin Short Circuit
A. Measure the resistance between the following ECM connector
terminals:
- For the 29-4 code, terminal 94 of the FA-C3 ECM connector and all other terminal in the FA-C3 ECM connector.
Short Circuit
Results: One or more of the measurements were less than 100 K ohms between the affected signal wire terminal and any other terminal in the ECM connector.
There is a short circuit in the wiring harness.
Repair: Repair or replace the wiring harness.
Results: All measurements were greater than 100 K ohms between the affected signal wire terminal and all other terminals in the ECM connector.
There is not a short circuit in the wiring harness.
Proceed to Test Step 6.
6. Check the Device that Provides the Desired Engine Speed Signal
A. Measure the desired engine speed signal, according to