140 RENR5042-02 Troubleshooting Section c. Connect the other wire between P2-25 and P401-1. Verify that the repair eliminates the problem. Expected Result: D. Use the following procedure for the primary engine speed/timing sensor: The problem remains with the suspect ECM. a. Fabricate a harness from two wires. The wires must reach between the secondary engine speed/timing sensor and the P2 connector. Twisted pair wiring is required. Ensure that the wires have at least one twist per inch. Results: OK Repair: If the problem is resolved with the test ECM and the problem returns with the suspect ECM, replace the ECM. b. Connect one wire of the harness between P2-46 and P402-2. c.
Connect one wire of the harness between P2-47 and P402-1. Verify that the repair eliminates the problem. STOP. E. Reconnect the P2 connector. Not OK F. Attempt to start the engine. Verify that the original problem is resolved. Repair: Replace the sensor. Verify that the repair eliminates the problem. Expected Result: STOP. The problem is corrected with the installation of the bypass harness. Results: i02289806 Engine Temperature Sensor Open or Short Circuit - Test OK Repair: Permanently install a new section of harness. SMCS Code: 5574-038-TA STOP. System Operation Description: Not OK Use this procedure to troubleshoot any suspect problems with the following sensors: Repair:
Verify that the correct terminals have been installed in the correct location on the P2 ECM connector. If the temporary harness was installed correctly, remove the temporary harness. Connect the original wiring. Intake manifold air temperature sensor Coolant temperature sensor Fuel temperature sensor Proceed to Test Step 6. Auxiliary temperature sensor Test Step 6. Check the ECM This procedure covers the following diagnostic codes: A. Turn the key switch to the OFF position. 110-03 Engine Coolant Temperature open/short to +batt B. Temporarily connect a test ECM. C. Start the engine. Run the engine in order to repeat the conditions when the problem occurs.
110-04 Engine Coolant Temperature short to ground 172-03 Intake Manifold Air Temp open/short to +batt D. If the problem is resolved with the test ECM, reconnect the suspect ECM. E. If the problem returns with the suspect ECM, replace the ECM. 172-04 Intake Manifold Air Temp short to ground 174-03 Fuel Temperature open/short to +batt