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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Engine Cranks But Does Not Run >> Circuit/System Verification

Circuit/System Verification

NOTE:

This diagnostic assumes the following:

  • The battery is completely charged.
  • The engine cranking speed is acceptable.
  • There is adequate fuel in the fuel tank.
  1. Crank the engine for up to 15s.
  2. Verify that P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P0335, P0336, P0351-P0354, P0601, P0602, P0603, P0604, P0606, P0607, P060E, P062F, P0685, P0689, P0690, P069E, P1516, P1682, P2610, or P2635 is not set.
    • If none of the DTCs are set 
  3. Ignition ON.
  4. Verify the security indicator on the instrument panel cluster illuminates momentarily.
    • If the indicator does not stay ON and is not flashing 
  5. Verify the scan tool Engine Speed parameter is greater than 0 RPM while cranking the engine.
    • If greater than 0 RPM 
  6. Ignition OFF.
  7. Disconnect a T8 ignition coil from a cylinder and spark plug.
  8. Connect a J 26792  HEI Spark Tester between the boot of the ignition coil and ground.
    9. NOTE:

    An erratic or weak spark is considered a no spark condition.

  9. Verify that the spark tester sparks while cranking the engine.
    • If the spark tester sparks 
  10. Ignition ON.
    11. NOTE:
    • If the engine is too hot, high fuel pressure readings may result due to hot soak fuel boiling. Allow the engine coolant temperature to cool to less than 60°C (150°F) before attempting to verify fuel pressure.
    • The Fuel Pump Enable may need to be commanded On a few times in order to obtain the highest possible fuel pressure.
    • Additional DTCs may set when using the fuel pump output control.
  11. Command the Fuel Pump Enable On several times with a scan tool.
  12. Verify that the scan tool Fuel Pressure Sensor parameter is between 345-650 kPa (50-94 psi) while the fuel pump is running.
    • If within the specified range 
  13. Verify that the scan tool Fuel Pressure Sensor parameter, after the pump has turned OFF, decreases to less than 600 kPa (87 psi), and does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • If within the specified range 
  14. Verify that the conditions listed below do not exist:
  15. All OK
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