128 RENR5042-02 Troubleshooting Section Results: OK – The connectors and wiring are okay. Proceed to Test Step 2. Not OK – There is a problem with the connectors or wiring. Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. STOP. Test Step 2. Check the Battery Voltage at the ECM A. Disconnect the J1/P1 ECM connector. B. Turn the keyswitch to the ON position. C. Measure the voltage between P1-52 (Unswitched Positive Battery) and P1-63 (Negative Battery). D. Measure the voltage between P1-48 (Unswitched Positive Battery) and P1-61 (Negative Battery).
g01120091 Illustration 59 E. Measure the voltage between P1-53 (Unswitched Positive Battery) and P1-65 (Negative Battery). J61 and P61 terminals that are associated with the electrical power supply (1) +Battery (2) -Battery (3) -Battery (9) -Battery (26) Keyswitch (27) Shutdown (31) +Battery (32) +Battery F. Measure the voltage between P1-70 (Keyswitch) and P1-63 (Negative Battery). Expected Result: The measured voltage is between 11.0 VDC and 13.5 VDC for a 12 volt system and between 22.0 VDC and 27.0 VDC for a 24 volt system with no suspected intermittent problems at this time. C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the electrical power supply. D.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, “Electrical Connectors - Inspect” for the correct torque values. Results: OK – The ECM is receiving the correct voltage. Repair: If an intermittent condition is suspected, refer to Troubleshooting, “Electrical Connectors - Inspect”. E. Check the harness and wiring for abrasions and for pinch points from the battery to the ECM. Also, check the harness and wiring for abrasions and for pinch points from the keyswitch to the ECM. STOP. Battery voltage is out of range Proceed to Test Step 3. Expected Result:
All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points. Keyswitch voltage out of range Repair: Trace the wiring for the keyswitch from the ECM through the keyswitch circuit to the batteries. Find the problem and repair the problem. Check the circuit protection for the circuit and for the wiring.