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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P2122, P2123, P2127, P2128, or P2138 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF for 90 s, disconnect the harness connector at the B107 Accelerator Pedal Position Sensor.
  2. Test for less than 3 Ω between each of the B107 Accelerator Pedal Position Sensor low reference circuit terminals 4 and 5 and ground.
    • If greater than 3 Ω, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between each of the B107 Accelerator Pedal Position Sensor 5 V reference circuit terminals 1 and 2 and ground.
    • If less than 4.8 V, test affected 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than 5.2 V test affected 5 V reference circuit for short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition ON, verify the scan tool APP sensor 1 and 2 voltages are less than 0.1 V.
    • If greater than 0.1 V, test the B107 Accelerator Pedal Position Sensor 1 and 2 signal circuits terminal 3 and 6 for a short to voltage. If the circuits tests normal, replace the K20 Engine Control Module.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 2 of the B107 Accelerator Pedal Position Sensor 1, verify the APP sensor 1 voltage is greater than 4.8 V.
    • If less than 4.8 V, test the B107 Accelerator Pedal Position Sensor 1 signal circuit for an open or short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the 5 V reference circuit terminal 1 of the B107 Accelerator Pedal Position Sensor 2. Verify that the APP sensor 2 voltage is greater than 4.8 V.
    • If less than 4.8 V, test the B107 Accelerator Pedal Position Sensor 2 signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
  7. If all circuits test normal replace the B107 Accelerator Pedal Position Sensor.
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