Circuit/System Testing
- Ignition OFF, disconnect the EC ignition relay.
- Ignition ON, verify that a test lamp illuminates between the coil voltage supply circuit and ground.
- If the test lamp does not illuminate, repair the coil voltage supply circuit for a short to ground or an open/high resistance.
- Ignition OFF, connect a test lamp between the coil control circuit and the coil voltage supply circuit.
- If the test lamp remains ON all the time, test for a short to ground on the control circuit. If the circuit/connections test normal, replace the ECM.
- Ignition ON. The test lamp should turn ON.
- If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
- Connect a 15A fused jumper wire between the switch voltage supply circuit and the ignition 1 voltage circuit.
- Attempt to start the engine. The engine should start.
- If the engine does not start, test the ignition 1 voltage circuit between the EC ignition relay and the ECM for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the ECM.
- If all circuits/connections test normal, test or replace the EC ignition relay.
IMPORTANT:
The ignition 1 voltage circuit is between the EC ignition relay and the ECM. The ignition 1 voltage is a feedback circuit.