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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 1.8L (Lay) - DTC P0441 To DTC P2A00) >> DTC P2120-P2123, P2125, P2127, P2128, or P1238 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the accelerator pedal assembly.
  2. Ignition OFF, test for 10 ohms or less between the low reference circuit terminal listed below and ground G104.
    • APP sensor 1 terminal 5
    • APP sensor 2 terminal 2
    • If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the PCM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal listed below and ground.
    • APP sensor 1 terminal 4
    • APP sensor 2 terminal 1
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the PCM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  4. Verify both scan tool APP sensor parameters are 0 volts.
    • If greater than the specified range, test the APP sensor signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
    5. IMPORTANT: The following test must be performed on both APP sensor signal circuits.
  5. Install a 3A fused jumper wire between the 5-volt reference circuit and the APP sensor signal circuit terminal listed below. Verify the correct scan tool APP sensor parameter as indicated.
    • APP sensor 1 terminal 6-5.0 volts
    • APP sensor 2 terminal 3-5.0 volts
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  6. If all circuits test normal, test or replace the accelerator pedal assembly.
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