Circuit/System Testing
NOTE:
The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.
- Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
- Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground of each T8 ignition coil.
- If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
- If the circuit tests normal, with the ignition OFF, disconnect the harness connector at each T8 ignition coil and monitor the fuse while individually connecting each T8 ignition coil. If the fuse opens, replace the appropriate T8 ignition coil.
- Ignition OFF, disconnect the K20 ECM harness connector X1.
- Ignition ON, connect a test lamp between the X1 67 ignition voltage circuit and ground. The test lamp should illuminate on each circuit.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance.
- If all circuits/connections test normal, replace the K20 ECM.