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Home >> Suzuki >> 2008 >> XL7 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0638, P2100, 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.
        NOTE: Disconnecting the throttle body harness connector causes additional DTCs to set.
  2. Ignition OFF, disconnect the harness connector of the throttle body. Ignition ON, test for 4.0-4.2 volts between the TAC motor control 1 circuit terminal B and ground.
    • If voltage is greater than the specified range, test each of the motor control circuits for a short to voltage. If the circuits tests normal, replace the ECM.
    • If voltage is less than the specified range, test the motor control 1 circuit for an open/high resistance or for a short to ground. Test each of the motor control circuits for a short to ground. If the circuits tests normal, replace the ECM.
  3. Test for 3.5-3.9 volts between TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A.
    • If the voltage is not within the specified range, test the motor control 2 circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, connect the J 34730-405 injector test lamp between the TAC motor control 1 and TAC motor control 2 circuits of the throttle body harness connector. Observe the injector test lamp while turning the ignition ON for 5 seconds and then OFF. Verify the injector test lamp illuminates brightly.
    • If the injector test lamp does not illuminate, replace the ECM.
  5. If all circuits test normal, replace the throttle body.
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