RENR5042-02 117 Troubleshooting Section D. Measure the voltage between terminals A and B at the harness connector for the sensor. Note: Wiggle the harness during the following measurements in order to reveal an intermittent condition. Expected Result: D. Measure the resistance between P1-4 (+8 V supply) and the remaining terminals on the P1 and P2 connectors. The voltage measurement is 8.0 ± 0.4 VDC. Results: E. Measure the resistance between P1-4 (+8 VDC supply) and the engine ground. OK – The voltage measurement is 8.0 ± 0.4 VDC. Repair: Connect the sensor connectors. Clear all diagnostic codes. Check for active diagnostic codes.
If the problem is intermittent, refer to Troubleshooting, “Electrical Connectors - Inspect”. Expected Result: Each check of the resistance indicates an open circuit. STOP. Results: Not OK The voltage measurement is not 8.0 ± 0.4 VDC. There is a problem with the wiring or with the ECM. Proceed to Test Step 5. OK Each check of the resistance indicates an open circuit. Proceed to Test Step 6. Test Step 4. Disconnect the +8 V Digital Sensor and Check for Active Diagnostic Codes Not OK At least one check of the resistance does not indicate an open circuit. A +8 V supply wire has a problem. There may be a problem with a connector. A. Disconnect the Engine coolant level sensor. Repair:
Repair the wire and/or the connector, when possible. Replace parts, if necessary. Verify that the problem is resolved. B. Wait for 15 seconds after you disconnect each sensor. Look for the active 041-04 diagnostic code to deactivate. STOP. Test Step 6. Check the +8 V Supply and the Sensor Common for an Open Circuit Expected Result: The 041-04 diagnostic code deactivates when a particular sensor is disconnected. A. Install a jumper wire between terminals P1-4 (+8 V supply) and P1-5 (Return). Results: OK The 041-04 diagnostic code deactivates when a particular sensor is disconnected. Note: Wiggle the harness during the following measurement in order to reveal any intermittent short condition.
Repair: Connect the suspect sensor. If the diagnostic code returns, replace the sensor. B. Measure the resistance between terminals A and B at the harness connector for each digital sensor. Connect all of the connectors. Verify that the problem is resolved. C. Remove the jumper wire. STOP. Expected Result: Not OK The 041-04 diagnostic code remains after all of the sensors are disconnected. Leave the sensors disconnected. Proceed to Test Step 5. Each resistance measurement is less than ten Ohms. Results: OK – Each resistance measurement is less than ten Ohms. Proceed to Test Step 7. Test Step 5. Check the +8 V Supply Wire for a Short Circuit A. Turn the keyswitch to the OFF position.
Not OK At least one resistance measurement is more than ten Ohms. A +8 V supply wire or a return wire has excessive resistance. There may be a problem with a connector. B. Disconnect the J1/P1 and J2/P2 connectors. C. Verify that all of the digital sensors are disconnected.