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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1995 (Engine Controls And Fuel - 3.6L (Ly7) - DTC P025A/P0300 To DTC P0700) >> DTC P0351-P0356 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the engine running, observe the applicable Cylinder IC Circuit Status parameters with the scan tool.
    • If a parameter displays IC CKT Short Gnd Test or IC CKT Open Test Fault, test for an open/high resistance or a short to ground in the affected IC circuit. All wire circuit resistance should measure less than 2 ohms.
    • If a parameter displays short to Volts Test Fault, test for a short to voltage in the affected IC circuit.
  2. Connect jumper wires from the harness connector of the ICM to the corresponding terminals of the ICM.
  3. Using the jumper wires, exchange the affected IC control circuit with a known good IC control circuit. Also exchange the spark plug wires of the corresponding coils.
  4. Start the engine.
    5. IMPORTANT: An open/high resistance on the low reference circuit to the ICM may cause a misfire.
  5. Observe the Misfire Current counters with the scan tool.
    • If the misfire transfers with the suspect IC control circuit, replace the ECM.
    • If the misfire remains with the coil, replace the ICM.
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