RENR5042-02 113 Troubleshooting Section Expected Result: Not OK – Voltage is not present on terminal B at the keyswitch. The diagnostic lamp turned on while the jumper wire was connected. The diagnostic lamp turned off when the jumper wire was removed. Repair: If voltage is not present on terminal B, repair the wire between the +Battery and the keyswitch. Check the battery’s no-load voltage. Return all wiring to the original configuration. Verify that the problem is resolved. Results: OK The diagnostic lamp turned on while the jumper wire was connected. The diagnostic lamp turned off when the jumper wire was removed.
The +Battery side of the circuit for the diagnostic lamp is functioning properly. There is a problem with the return wire between the diagnostic lamp and the P1 connector. STOP. Not OK – Voltage is not present on terminal R at the keyswitch. Repair: If voltage is present on terminal B of the keyswitch but not present on terminal R, replace the keyswitch. Return all wiring to the original configuration. Verify that the problem is resolved. Repair: Repair wire F404-RD between the diagnostic lamp and P1-28. Verify that the problem is resolved. STOP. STOP. Test Step 6. Check the Operation of the ECM Not OK The diagnostic lamp did not turn on when the jumper wire was connected.
There is a problem with the +Battery side of the circuit for the diagnostic lamp. Proceed to Test Step 5. A. Remove terminal P1-28. B. Fabricate a jumper wire 100 mm (4 inch) long. Crimp a Deutsch pin to both ends of the wire. Test Step 5. Check the Voltage from the Keyswitch to the Diagnostic Lamp A. Turn the keyswitch to the OFF position. C. Insert the jumper into P1-28. D. Connect the J1/P1 connectors. B. Remove the wire from the terminal R of the keyswitch. E. Connect one probe of a voltage test lamp to the jumper wire in P1-28. C. Turn the keyswitch to the ON position. D. Measure the voltage on terminal B of the keyswitch to engine ground. F.
Connect the other probe of the voltage test lamp to +Battery. G. Turn the keyswitch to the ON position. Wait for ten seconds. E. Measure the voltage on terminal R of the keyswitch to engine ground. H. Turn the keyswitch to the OFF position. F. Turn the keyswitch to the OFF position. Expected Result: Expected Result: The test lamp turned ON for five seconds. Then, the test lamp turned OFF. Voltage is present on terminal B and terminal R at the keyswitch. Results: Results: OK The test lamp turned ON for five seconds. Then, the test lamp turned OFF. The ECM is operating correctly. The problem appears to be resolved. OK – Voltage is present on terminal B and terminal R at the keyswitch. Repair:
If voltage is present on terminal R, repair the wire between the keyswitch and the diagnostic lamp. Verify that the breaker is not tripped. Return all wiring to the original configuration. Verify that the problem is resolved. Repair: The problem may be intermittent. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, “Electrical Connectors - Inspect”. STOP. STOP.