LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 356 (Engine Controls And Fuel - 3.6L (LGX) - DTC P0446 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 GMC Acadia. 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.
  • There is adequate fuel in the fuel tank.
  1. Crank the engine for up to 15 s.
  2. Verify DTC P0116, P0118, P0119, P0191, P0192, P0193, P0201-P0206, P0232, P023F, P025A, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0335, P0336, P0351-P0356, P0601, P0602, P0603, P0604, P0606, P06A6, P062B, P062F, P069E, P0627, P0628, P0629, P0630, P0641, P064A, P1255, P1631, P16F3, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P2534, P262B, P2635, 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 condition with the MAF sensor or MAF sensor circuits 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 ON.
  8. Verify the scan tool BARO parameter is within the value specified in the Altitude Versus Barometric Pressure table.
    • If within the specified value 
  9. Install the J 26792  HEI Spark Tester between the boot of a spark plug wire and ground.
    10. NOTE:
    • Perform this test on at least one cylinder of each cylinder bank.
    • An erratic or weak spark is considered a no spark condition.
  10. Verify the spark tester sparks while cranking the engine.
    • If the spark tester sparks 
    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. Ignition ON, command the Fuel Pump Enable ON several times with a scan tool.
  12. 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 value 
    13. NOTE:

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

  13. Verify the Chassis Control Module Fuel Pressure Sensor parameter, after the fuel pump turns OFF, decreases to 500-599 kPa (72-87 psi) and does not decrease more than 34 kPa (5 psi) in 1 minute.
    • If within the specified value 
  14. Verify the Fuel Rail Pressure Sensor parameter is between 1.9-2.1 MPa (279-305 psi) while cranking the engine.
    • If within the specified range 
  15. Verify none of the conditions listed below exist:
    • If no conditions exist 
  16. All OK.
scientia non olet · About LEMON Manuals