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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 167 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0650 To DTC P3436 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 car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
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, P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0335, P0336, P0513, P0601, P0602, P0603-P0606, P062B, P0627, P0628, P0629, P0633, P0685-P0687, P0689-P0690, P069E, P1631, P1649, P1682, P2147, P2148, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, 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 displays 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.
  8. Connect the EL 26792  to one of the T8 ignition coils.
    9. NOTE:
    • Perform the spark test on at least 3 of the cylinders.
    • An erratic or weak spark is considered a no spark condition.
  9. Verify the EL 26792  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 ON, engine OFF, command the Fuel Pump Enable On several times with a scan tool.
  11. Verify the Chassis Control Module Fuel Pressure Sensor parameter is between 345-690 kPa (50-100 PSI) with the fuel pump running.
    • If within the specified range 
    12. NOTE:

    The fuel pressure may vary slightly when the fuel pump stops running. After the fuel pump stops running, the fuel pressure should stabilize and remain constant.

  12. Verify the Fuel Pressure Sensor parameter, after the fuel pump has turned OFF, stabilizes to between 500-599 kPa (72-87 PSI) and does not decrease more than 34 kPa (5 PSI) in 1 minute.
    • If within the specified range 
  13. Verify the scan tool Fuel Rail Pressure Sensor parameter displays between 1.9-2.1 MPa (279-305 PSI) while cranking the engine.
    • If within the specified range 
  14. Verify none of the conditions listed below exist:
  15. All OK.
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