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Home >> Suzuki >> 2006 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - DTC P0420 To DTC P2076 >> DTC P1516, P2101, or P2119 >> Circuit/System Testing
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Circuit/System Testing

  1. Inspect the throttle body for the following conditions:
    • A throttle blade that is not in the rest position
    • A throttle valve that is binding open or closed
    • A throttle valve that opens or closes without spring pressure
    • If a condition is found, replace the throttle body.
    2. IMPORTANT: Disconnecting the throttle body harness connector causes additional DTCs to set.
  2. Ignition OFF, disconnect the harness connector of the throttle body.
  3. Ignition ON, measure for less than 0.5 volt on the motor control 1 and motor control 2 circuits.
    • If voltage is greater than 0.5 volt, test the appropriate motor control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, probe motor control 1 and motor control 2 circuits with a test lamp connected to B+. Verify the test lamp does not illuminate.
    • If the test lamp illuminates, test the appropriate motor control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, connect the test lamp between the TAC motor control 1 and TAC motor control 2 circuits of the throttle body harness connector. Observe the test lamp while turning the ignition ON for 5 seconds and then OFF. Verify the test lamp illuminates.
    • If the test lamp does not illuminate, test each motor control circuit for an open or for a short between the TAC motor control 1 and TAC motor control 2 circuits. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, replace the throttle body.
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