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Home >> Buick >> 2015 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Controls And Fuel - 2.4L (Lea) - 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

WARNING: This page is about a different variant/trim than selected.
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 15 s.
  2. Verify DTC P0116, P0118, P0335, P0336, P0513, P0601, P0602, P0603-P0606, P062B, P0627, P0628, P0629, P0633, P069E, P1631, P1649, or U0109 is not set.
    • If none of the DTCs are set 
  3. Ignition ON.
  4. Verify the security indicator on the instrument cluster illuminates momentarily.
    • If the security 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. NOTE:

    A MAF sensor circuit condition may cause an Engine Cranks But Does Not Run condition without setting a DTC.

  6. Verify the scan tool Mass Airflow Sensor parameter displays greater than 0 Hz while cranking the engine.
    • If greater than 0 Hz 
  7. Ignition OFF, 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. 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.
  10. Ignition OFF, install a CH-48027  Digital Pressure Gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  11. Ignition ON.
  12. Command the Fuel Pump Enable ON several times with a scan tool.
  13. Verify the fuel pressure is between 345-650 kPa (50-94 psi) with the fuel pump running.
    • If within the specified range 
  14. Verify the fuel pressure, after the fuel pump turns OFF, decreases to less than 600 kPa (87 psi) and does not decrease more than 34 kPa (5 psi) in 1 minute.
    • If within the specified range 
  15. Verify none of the conditions listed below exist:
  16. All OK.
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