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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 >> 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 that DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0335, P0336, P0601-P0604, P0606, P0627, P062B, P062F, P0630, P0685, P0686, P0687, P0689, P0690, P1248, P1249, P124A, P124B, P1682, P2147-P2157, or P2610 is not set.
    • If none of the DTCs are set 
  3. Ignition ON
  4. Verify the Theft Deterrent indicator on the instrument cluster illuminates momentarily.
    • If the Theft Deterrent indicator does not stay ON and is not flashing 
  5. Verify the scan tool Engine Speed parameter displays greater than 0 RPM while cranking the engine.
    • If greater than 0 RPM 
    6. NOTE:

    Use the J 26792  HEI spark tester to verify the output of each ignition coil/module.

  6. Ignition OFF, disconnect a T8 ignition coil from a cylinder and a spark plug.
  7. Connect the J 26792  HEI spark tester between the boot of the T8 ignition coil and ground.
    8. NOTE:
    • An erratic or weak spark is considered a no spark condition.
    • Perform the spark test on at least 3 of the cylinders.
  8. Verify the spark tester sparks while cranking the engine.
    • If the spark tester sparks 
  9. Ignition OFF, install the CH-48027  Digital Pressure Gauge. Refer to Fuel Pressure Gauge Installation and Removal .
  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 the fuel pressure is between 345-650 kPa (50-94 PSI) with the fuel pump running.
    • If within the specified range 
  13. Verify the fuel pressure, 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 the conditions listed below do not exist:
    • If a condition exists 

      Repair as necessary.

    • If no condition exists 
  15. All OK.
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