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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1147 (Engine Controls And Fuel - 3.6L - DTC P0137 To DTC P0497) >> DTC P0351-P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, or P2316 (w/LLT) >> Circuit/System Testing (w/LLT)

Circuit/System Testing (w/LLT)

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate ignition coil.
    2. IMPORTANT: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.
  3. Crank or start the engine. Test for 200-400 mV between the appropriate IC circuit terminal 1 and ground.
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit/connection tests normal, replace the ECM.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.
  4. Connect a test lamp between the each of the ground circuits terminal 3, and terminal 4, and B+. The test lamp should illuminate on each circuit.
    • If the test lamp does not illuminate, test the suspected circuit for an open/high resistance.
  5. If all circuits/connections test normal, replace the ignition coil.
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