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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic.
  1. Ignition OFF, disconnect the harness connector of the ignition coil.
  2. Ignition ON, load test for battery voltage between the ignition voltage circuit terminal D and ground.
    • If less than B+, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.
  3. Crank or start the engine. Test for 200-400 mV between the appropriate IC circuit terminal C and ground.
    • If less than the specified value, test the IC circuit for a short to ground or an open/high resistance. If the circuit/connection tests normal, replace the ECM.
    • If greater than the specified value, test the IC circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.
  4. Ignition OFF, test for 5 ohms or less between the low reference circuit terminal B and the ECM housing.
    • If greater than the specified value, test for an open/high resistance in the low reference circuit. If the circuit/connection tests normal, replace the ECM.
  5. Test for 5 ohms or less between the ground circuit terminal A and ground.
    • If greater than the specified value, repair the open, or high resistance in the ground circuit.
  6. If all circuits/connections test normal, replace the ignition coil.
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