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Home >> Buick >> 2015 >> Verano Leather >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 2.0L (LHU) - DTC P025A To DTC P2635 Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0351-P0354, P2300, P2301, P2303, P2304, P2306, P2307, P2309, or P2310: Ignition Coil Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Engine Running.
  2. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status does not display Malfunction.
    • If Malfunction is displayed 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the control circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If Malfunction is not displayed 
  3. Verify the appropriate scan tool Ignition Coil Control Circuit High Voltage Test Status does not display Malfunction.
    • If Malfunction is displayed 
    1. Ignition OFF, disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If Malfunction is not displayed 
  4. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminal C and ground, engine Running.
  5. Verify the appropriate scan tool Ignition Coil Control Circuit Low Voltage Test Status displays Malfunction.
    • If Malfunction is not displayed 
    1. Ignition OFF, remove the fused jumper, and disconnect the X3 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If Malfunction is displayed 
  6. Test or replace the T8 Ignition Coil.
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