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Home >> Suzuki >> 2007 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 1.6L - DTC P0650 To P2A01 >> DTC P0685 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the EC ignition relay.
  2. 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.
  3. 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.
  4. 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.
    5. IMPORTANT: The ignition 1 voltage circuit is between the EC ignition relay and the ECM. The ignition 1 voltage is a feedback circuit.
  5. Connect a 15A fused jumper wire between the switch voltage supply circuit and the ignition 1 voltage circuit.
  6. 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.
  7. If all circuits/connections test normal, test or replace the EC ignition relay.
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