Circuit/System Testing
- Ignition OFF, disconnect the EC ignition relay.
- Ignition ON, verify a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.
- If the test lamp does not illuminate, repair the relay coil ignition circuit for a short to ground or an open/high resistance.
- Ignition OFF, connect a test lamp between the relay coil control circuit terminal 85 and the relay coil ignition circuit terminal 86.
- If the test lamp is always ON, test the relay coil control circuit for a short to ground. If the circuit tests normal, replace the ECM.
- Ignition ON, verify the test lamp turns ON.
- If the test lamp is always OFF, test the relay coil control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Connect a 15A fused jumper wire between the relay switch B + circuit terminal 30 and the relay switch ignition 1 voltage circuit terminal 87.
- Attempt to start the engine. The engine should start.
- If the engine does not start, test the relay switch 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 tests normal, replace the ECM.
- If all circuits 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.