GEAR-DISC 8U5985 - Caterpillar

Illustration 4 g01396252
P1 ECM connector (P1-29) Digital return (P1-32) Speed/timing sensor supply (P1-38) Primary speed/timing sensor signal (P1-39) Secondary speed/timing sensor signal
Perform a 45 N (10 lb) pull test on each of the wires in the circuit.
Check the allen head screw from each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All of the 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.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Restore electrical power to the ECM.
Check for active diagnostic codes on Cat ET.Look for the following codes:
190-02
190-03
190-08
342-02
342-03
342-08Expected Result:None of the above diagnostic codes are active.Results:
OK - None of the above codes are active, but there is a problem that has been associated with the engine speed/timing sensors. Proceed to Test Step 3.
OK - None of the above codes are active.Repair: There may be an intermittent problem in the circuit. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - One or more of the above codes are active. Proceed to Test Step 3.Test Step 3. Inspect the Condition of the Engine Speed/Timing Sensors
Remove electrical power from the ECM.
Remove the suspect engine speed/timing sensor.
Inspect the sensor tip for damage.
Inspect the plastic sliphead for damage.
Check the tension on the sliphead by gently prying the sliphead out of the sensor body. Extend the sliphead 3 to 4 mm (0.12 to 0.16 inch). Push the sliphead back into the sensor body from the extended position. Movement of the sliphead will require a small amount of force. The amount of tension that is on the sliphead must not allow movement of the sliphead during engine operation.
Again, pull the sliphead from the sensor body to the fully extended position.Expected Result:The sensor is not damaged. An adequate amount of tension is felt on the sliphead and the movement is smooth.Results:
OK - The engine speed/timing sensor and the sliphead are undamaged. The tension on the sliphead is normal.Repair: Reinstall the engine speed/timing sensor. Ensure that the camshaft gear is positioned correctly prior to installing the sensor. Proceed to Test Step 4.
Not OK - The engine speed/timing sensor or the sliphead is damaged.Repair: Replace the engine speed/timing sensor.STOPTest Step 4. Check the Engine Speed on Cat ET
Restore electrical power to the ECM.
Observe the engine speed on Cat ET