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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1856 (Engine Controls And Fuel - 2.4L (Lat) - DTC P0010 To DTC P0354) >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: All electrical components and accessories must be turned OFF, and allowed to power down.
  1. Ignition OFF, disconnect the MAF/IAT harness connector at the MAF/IAT sensor.
  2. Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal A and ground.
    • 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 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Connect the J 38522  to the vehicle. See Special Tools . Refer to Component Testing  for instructions.
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