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Home >> Suzuki >> 2006 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - DTC P2104 To DTC P2282 >> DTC P2122, P2123, P2127, P2128, or P2138 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the accelerator pedal assembly.
  2. Ignition OFF, test for less than 5 ohms of resistance between the appropriate low reference circuit of the APP sensor and ground.
    • If greater than 5 ohms, test the low reference circuit of the APP sensor for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the ECM.
    3. IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
  3. Ignition ON, test for 4.8-5.2 volts between the appropriate 5-volt reference circuit of the APP sensor and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit of the APP sensor 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 of the APP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. Using a scan tool, verify the appropriate APP sensor percentage parameter is at 0%.
    • If greater than 0 percent, test the signal circuit of the applicable APP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Install a 3A fused jumper wire between the appropriate signal circuit and the 5-volt reference circuit of the APP sensor. Verify the APP sensor percentage parameter is greater than 85 percent.
    • If less than the specified value, test the appropriate signal circuit of the APP sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, test or replace the accelerator pedal assembly.
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