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Home >> GMC >> 2011 >> Terrain SLT, 2.4 C, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.4L - DTC P0300 Through P1682 >> DTC P0351-P0354 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
  2. Ignition OFF, all vehicle systems OFF, it may take up to 2 minutes for all the systems to power down. Test for less than 5 Ω between the ground circuit terminal 1 and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
  5. Engine idling at operating temperature, test for 0.200-0.300 V between the appropriate ignition control circuit terminal 3 and ground.
    • If less than the specified range, test the ignition control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the ignition control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. If all circuits test normal, test or replace the T8 ignition coil.
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