144 RENR5042-02 Troubleshooting Section B. Turn the keyswitch to the ON position. Repair: The low resistance measurement indicates a short circuit between two or more wires. Repair the connectors or wiring and/or replace the connectors or wiring. C. Measure the voltage between terminal 1 (signal) and terminal 2 (sensor common) at the sensor connector. D. Turn the keyswitch to the OFF position. STOP. Expected Result: Test Step 5. Create a Short at the Suspect Sensor Connector The voltage is 5.5 ± 0.5 VDC. A. Turn the keyswitch to the OFF position. Results: B. Install a jumper wire between terminal 1 and terminal 2 on the connector for the suspect sensor.
Connect the jumper on the harness side of the connector. OK – The voltage is 5.5 ± 0.5 VDC. The correct pull-up voltage is present at the suspect sensor connector. C. Turn the keyswitch to the ON position. Repair: The open circuit is in the sensor or the wire between the sensor and the sensor connector. Replace the sensor. Do not install the sensor in the engine. Verify that no diagnostic codes are active for the suspect sensor before permanently installing the sensor. D. Wait at least 15 seconds for activation of the 04 diagnostic code. Note: Monitor the “Active Diagnostic Codes” screen on the electronic service tool before installing the jumper wire and after installing the jumper wire.
STOP. E. Remove the jumper wire. Check for an 04 diagnostic code again. Not OK The voltage is not 5.5 ± 0.5 VDC. Proceed to Test Step 4. Test Step 4. Check the Signal Wire for a Short Circuit F. Turn the keyswitch to the OFF position. Expected Result: A. Turn the keyswitch to the OFF position. An 04 diagnostic code is active when the jumper wire is installed. An 03 diagnostic code is active when the jumper wire is removed. B. Disconnect the P2 connector. C. Measure the resistance between the terminal for the sensor signal wire at the ECM and the remaining terminals on the P2 connector. Results: OK – The engine harness and the ECM are okay. D.
Measure the resistance between the terminal for the sensor signal wire at the ECM and engine ground. 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. E. Turn the keyswitch to the OFF position. F. Reconnect the P2 connector. Expected Result: STOP. Each check of the resistance is greater than 20,000 Ohms. Not OK – The 03 diagnostic code remains active with the jumper in place. There is an open circuit between the ECM and the sensor connector.
Proceed to Test Step 7. Results: OK – Each check of the resistance is greater than 20,000 Ohms. Proceed to Test Step 5. Test Step 6. Disconnect the Suspect Sensor in Order to Create an Open Circuit Not OK At least one check of the resistance is less than 20,000 Ohms. A. Turn the keyswitch to the OFF position.