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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Control System & Fuel System - 1.8L (Lay) - DTC P0010 To DTC P0420) >> DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135, or P2172 >> 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 throttle body assembly.
  2. Ignition OFF, test for 10 ohms or less between the low reference circuit terminal 3 and ground G104.
    • 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 5 and ground.
    • 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. Test for 4.8-5.2 volts between the TP sensor signal circuit terminal listed below and ground.
    • TP sensor 1 terminal 6
    • TP sensor 2 terminal 3
    • 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.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  5. If all circuits test normal, test or replace the throttle body assembly.
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