System Operation Description:
The ECM activates the start relay when the key start switch is in the START position. The ECM detects a failure in the circuit for the start relay and the electrical system. "Check the key start switch". See Troubleshooting, "Diagnostic Code List".
Test Step 1. CHECK THE KEY START SWITCH IN THE START POSITION.
- Disconnect the ECM from the machine harness.
- Turn and hold the key start switch in the START position.
- At the machine harness connector for the ECM, measure the voltage between contact J2-1 (wire 307-OR) and contact J1-13 (wire 203-BK) (ground).
Expected Result:
The +battery voltage should be present.
Results:
- YES - The +battery voltage is present. Proceed to Test Step 2.
- NO - The +battery voltage is NOT present. The key start switch or the machine harness (wire 307-OR) has failed. Check the key start switch and the machine harness.
Repair: If necessary, replace the key start switch and/or the machine harness.
STOP
Test Step 2. CHECK THE KEY START SWITCH IN THE OFF POSITION.
- The ECM remains disconnected from the machine harness.
- Turn the key start switch to the OFF position.
- At the machine harness connector for the ECM, measure the voltage between contact J2-1 (wire 307-OR) and contact J1-13 (wire 203-BK) (ground).
Expected Result:
The +battery voltage should be present.
Results:
- YES - The +battery voltage is present. The key start switch or the machine harness (wire 307-OR) has failed. Check the key start switch and the machine harness.
Repair: If necessary, replace the key start switch and/or the machine harness.
STOP
- NO - The +battery voltage is NOT present. The harness circuit operates correctly. The ECM has failed.
Repair: It is unlikely that the ECM has failed. Exit this procedure and perform these test steps again. If the cause of the failure is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
