CYLINDER HEAD GP 1720836 - Caterpillar

connectors (5 through 8).
Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
D. Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
E. Check the harness and wiring for abrasion and for pinch points from the sensors back to the ECM.
All connectors, pins, and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.
Result: The harness and connectors appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the connectors and/or wiring.
Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are completely coupled.
Verify that the repair eliminates the problem.
2. Check for Active Diagnostic Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector.
B. Restore electrical power to the ECM.
C. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Look for the following diagnostic codes.(1)
1. 41-3
2. 41-4
3. 100-10
4. 262-3
5. 262-4
6. 1785-10
No diagnostic codes are active.
Result: No diagnostic code is active.
The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect"
Result: The 100-10 or 1785-10 diagnostic code is logged at this time.
The analog supply is not reaching the sensor. Proceed to Test Step 3.
Result: A 262-3 or 262-4 diagnostic code is active at this time.
There is a problem with the sensor supply for the analog sensors. Proceed to Test Step 4.
Result: A 41-3 or 41-4 diagnostic code is active at this time.
There is a problem with the sensor supply for the digital sensors. Proceed to Test Step 6
3. Check the Supply Voltage at the Sensor Connector
A. Disconnect the harness connectors for the sensor which has the active -10 diagnostic code.
B. Restore the electrical power to the ECM.
C. Be sure to wiggle the harness during the following measurements to reveal an intermittent condition.
D. Measure the voltage between terminals A and B at the connector.
The voltage measurement is 5.0 0.2 VDC.
Result: The voltage measurement is 5.0 0.2 VDC.
The analog sensor supply is reaching the sensor connector. There may be a problem with the sensor. Perform the following procedure:
1. Clear all diagnostic codes.
2. Run the engine. Allow the engine to warmup. Use the Cat (ET) to check for diagnostic codes that have become active or logged.
If the code becomes active or logged, the sensor is faulty. Replace the sensor. Verify that the repair eliminates the original problem.
If the code does not become active or logged, there may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct troubleshooting procedure.
Result: The voltage measurement is not 5.0 0.2 VDC. There is a problem