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Home >> Suzuki >> 2007 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 1.6L - DTC P0016 To P0317 >> DTC P0122, P0123, P0222, P0223, or P2135 (w/Throttle Actuator Control) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the throttle body assembly.
  2. Ignition OFF, test for 5 ohms or less of resistance between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  3. Ignition ON, load test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. Verify both TP sensor percentage parameters are between 80-88 percent.
    • If TP sensor 1 is greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
    • If TP sensor 1 is less than the specified range, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
    • If TP sensor 2 is less than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
    • If TP sensor 2 is greater than the specified range, test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  5. Install a 3A fused jumper wire between TP sensor 1 signal circuit and ground. Verify the TP sensor 1 percentage parameter is less than 2 percent.
    • If greater than the specified value, test the signal circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. Install a 3A fused jumper wire between TP sensor 2 signal circuit and the 5-volt reference circuit. Verify the TP sensor 2 percentage parameter is less than 2 percent.
    • If greater than the specified value, test the signal circuit 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 throttle body assembly.
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