134 RENR5042-02 Troubleshooting Section Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes. d. Remove the wire jumper and reconnect all wires. Expected Result: An open circuit diagnostic code 03 is active when the sensor signal wire is removed from the ECM connector. A short circuit diagnostic code 04 is active when the signal wire is connected to the sensor return. STOP.
Not OK The open circuit diagnostic code 03 remains active with the jumper in place. The open circuit is between the ECM and the sensor connector. Proceed to Test Step 8. Results: OK – The ECM is operating properly. The problem is in the wiring between the ECM and the sensor connector. Test Step 8. Check the Operation of the ECM Repair: If the code is active for more than one sensor, the problem is most likely in the return wire for the sensor. Repair the return wire for the sensor or replace the harness. A. Turn the keyswitch to the OFF position. B. Check the operation of the ECM by creating an open at the ECM.
If the code is only active for one sensor, the problem is most likely in the signal wire for the sensor. Repair the signal wire for the sensor. a. Remove the signal wire for the suspect sensor from the P2 ECM connector. b. Remove the sensor return for the suspect sensor from the P2 ECM connector. STOP. Not OK – One of the following conditions exists: The open circuit diagnostic code 03 is not active when the sensor signal wire is disconnected. The short circuit diagnostic code 04 is not active when the wire jumper is installed. Note: Disconnecting the sensor return from the ECM will generate an open circuit diagnostic code for all sensors that are connected to the sensor return.
Troubleshoot the original diagnostic code. Delete the logged diagnostic codes when you are finished. c. Reconnect the ECM connector. Repair: Replace the ECM. Refer to Troubleshooting, “Replacing the ECM”. Verify that the problem is resolved. d. Turn the keyswitch to the ON position. Monitor the “Active Diagnostic Code” screen on the electronic service tool. Wait at least 15 seconds for activation of the code. STOP. i02290001 Engine Speed/Timing Sensor Circuit - Test An open circuit diagnostic code (03) should be active for the suspect sensor. C. Check the operation of the ECM by creating a short at the ECM. SMCS Code: 1912-038 a.
Install a wire jumper between the two terminals for the sensor signal and the sensor return. System Operation Description: Use this procedure to troubleshoot any suspect problems with the following sensors: b. Reconnect the ECM connector. c. Monitor the “Active Diagnostic Code” screen on the electronic service tool. Wait at least 15 seconds for activation of the code. Primary engine speed/timing sensor Secondary engine speed/timing sensor A short circuit diagnostic code (04) should be active when the wire jumper is installed. This procedure covers the following open circuit diagnostic codes and short circuit diagnostic codes: 190-08 Engine Speed abnormal