138 RENR5042-02 Troubleshooting Section Note: The bracket cannot be replaced separately. Test Step 3. Measure the Sensor Resistance through the Engine Harness C. Remove the sensor. Ensure that one O-ring (3) is installed on the sensor. Check the O-ring for damage. Replace the O-ring, if necessary. A. Turn the key switch to the OFF position. Expected Result: B. Thoroughly inspect the J2/P2 ECM connector. Refer to Troubleshooting, “Electrical Connectors - Inspect” for details. The sensor’s components are okay. Results: C. Perform a 45 N (10 lb) pull test on the wires that are associated with the engine speed/timing sensors. OK – The sensor’s components are okay. D.
Ensure that the latch tab on each sensor connector is properly latched. Repair: Perform the following procedure in order to properly install the sensor: 1. Lubricate the O-ring with engine oil. E. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, “Electrical Connectors - Inspect” for the correct torque values. 2. Fully seat the sensor in the engine. Note: If the sensor will not fully seat into the engine, replace the sensor. F. Repair the harness or repair the connector if a problem is found. 3. Tighten the bracket bolt. G. Ensure that the wiring harness is correctly routed and secured at the correct locations. 4.
Connect the sensor’s electrical connector. Verify that the connector is latched on both sides. H. Ensure that the harness wiring is not pulled too tightly. When the harness wiring is pulled too tightly, vibrations or movement can cause intermittent connections. 5. Ensure that the harness is properly secured, and ensure that the tie-wraps are placed in the correct location. Proceed to Test Step 3. I. Inspect the harness wiring for nicks and abrasions. Not OK – At least one of the sensor’s components is not okay. J. If the harness and the connector are OK, disconnect the J2/P2 ECM connector. K.
If you are troubleshooting a problem with the primary engine speed/timing sensor, perform the following procedure: Repair: Obtain a new sensor. Perform the following procedure in order to properly install the new sensor: 1. Lubricate the O-ring with engine oil. a. Measure the sensor’s resistance between P2-35 (Primary engine speed/timing positive) and P2-25 (Primary engine speed/timing negative). 2. Fully seat the sensor in the engine. Note: If the sensor will not fully seat into the engine, replace the sensor. b. Check for an intermittent open circuit or for a short circuit by moving the harness while you take the resistance measurement.
Pull the wires that are directly behind the sensor or shake the wires that are directly behind the sensor. 3. Tighten the bracket bolt. 4. Connect the sensor’s electrical connector. Verify that the connector is latched on both sides. Resistance ............................ 75 to 230 Ohms 5. Ensure that the harness is properly secured, and ensure that the tie-wraps are placed in the correct location. L. If you are troubleshooting a problem with the secondary engine speed/timing sensor, perform the following procedure: Verify that the repair eliminates the problem. STOP.