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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Engine Cranks But Does Not Run (LUV) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. 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.
  • An engine that starts and stalls is considered to not run.
  1. Crank the engine for up to 15 s.
  2. Verify that DTC P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0222, P0223, P0231, P0232, P023F, P0261, P0262, P0264, P0265. P0267, P0268, P0270, P0271, P0335, P0336, P0601, P0602, P0603, P0604, P0606, P062B, P062F, P0630, P0685, P0686, P0687, P0689, P0690, P1516, P1682, P16F3, P2101, P2119, P2135, P2176, P262B, or P2635 is not set.
    • If none of the DTCs are set 
  3. Ignition ON.
  4. Verify that the immobilizer system indicator on the instrument cluster illuminates momentarily.
    • If the 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:

    It may be necessary to secure the EN 36012-A  Ignition System Diagnostic Harness to the spark plug boots with electrical tape.

  6. Connect the EN 36012-A  Ignition System Diagnostic Harness to the spark plug boots.
  7. Connect the EL 26792  HEI Spark Tester between the boot of a spark plug wire and ground.
  8. Connect the remaining wires to the appropriate cylinders.
    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 spark tester sparks, while cranking the engine.
    • If the spark tester sparks 
  10. Ignition OFF, all accessories OFF, install a CH 48027  Digital Pressure Gauge.
  11. Ignition ON.
    12. 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.
  12. Command the Fuel Pump Enable On several times with a scan tool.
  13. Verify that the fuel pressure is between 345-650 kPa (50-94 PSI) with the fuel pump running.
    • If within the specified range 
  14. Verify that the fuel pressure, after the fuel pump is turned 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. Ignition OFF, disconnect the harness connector of a fuel injector.
  16. Connect a test lamp between the control circuit and the ignition voltage circuit of the harness connector.
    17. NOTE:

    Perform the fuel injector test on at least 3 fuel injectors

  17. Verify the test lamp flashes while cranking the engine.
    • If the test lamp flashes 
  18. Verify the conditions listed below do not exist:
    • A collapsed air intake duct to the throttle body
    • A restricted air filter or air intake system
    • Coolant or gas fouled spark plugs
    • A skewed manifold absolute pressure (MAP) sensor
    • A skewed engine coolant temperature (ECT) sensor
    • A restricted exhaust system. Refer to Restricted Exhaust .
    • Contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • An engine mechanical condition, for example, worn timing chain and gears or low compression-Refer to Symptoms - Engine Mechanical .
      • If a condition exists 

        Repair as necessary.

    • If no condition exists 
  19. All OK
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