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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 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.
CAUTION:
  • Do not attempt more than 10 engine starts without driving the vehicle to ensure the battery pack is charged.
  • Do not operate the vehicle in Neutral for more than 5 minutes. When the 'Shift to Park' Driver Information Center (DIC) message is displayed, the vehicle must be immediately shifted to Park or driven.

Excessive engine crank attempts where the engine cranks but does not run or extended operation of the vehicle while in Neutral, will discharge the high voltage battery pack. In order to prevent deep discharging and damaging the high voltage battery pack, ensure that these precautions are followed.

NOTE: This diagnostic assumes the following:
  1. Attempt to start the engine while observing the DTC information with a scan tool.
  2. Verify that DTC P0117, P0118, P018B, P018C, P018D, P0119, P0121, P0122, P0123, P0222, P0223, P0231, P0232, P023F, P025A, P0335, P0336, P0513, P0562, P0563, P0601, P0602, P0603, P0604, P0606, P062F, P0628, P0629, P0633, P0641, P064A, P0685, P0689, P0690, P06A6, P1255, P1516, P1631, P1682, P16F3, P2101, P2119, P2135, P2176, P2610 or P2635 is not set.
    • If none of the DTCs are set 
  3. Verify the scan tool Engine Speed parameter displays greater than 0 RPM while attempting to start the engine.
    • If greater than 0 RPM 
  4. Vehicle in Service Mode, command the Fuel Pump Enable ON several times with a scan tool.
  5. Verify the scan tool circuit parameters listed below do not display Malfunction:
    • Fuel Pump Enable Circuit High Voltage Test Status
    • Fuel Pump Enable Circuit Open Test Status
    • Fuel Pump Enable Circuit Low Voltage Test Status
    • If Malfunction is not displayed 
  6. Vehicle OFF, install the CH-48027  digital pressure gauge.
    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 record fuel pressure.
    • The fuel pump may need to be commanded ON a few times, in order to obtain the highest possible fuel pressure.
    • Do NOT start the engine for this test.
  7. Vehicle in Service Mode, command the Fuel Pump Enable ON several times with a scan tool.

    Verify the fuel pressure is between 379-427 kPa (55-62 PSI) with the fuel pump running.

    • If within the specified range 
  8. Vehicle OFF, disconnect the harness connector at a Q17 Fuel Injector.
  9. Connect the J 34730-2C  injector tester to the fuel injector harness connector.
  10. Verify the injector tester flashes or illuminates while attempting to start the engine.
    • If the injector tester flashes or illuminates 
  11. Install the J 36012-A  ignition system diagnostic harness to the spark plug boots.
    NOTE: It may be necessary to secure the J 36012-A  ignition system diagnostic harness to the spark plug boots with electrical tape.
  12. Connect the J 26792 HEI spark tester between the boot of a spark plug wire and ground.
  13. Connect the remaining wires to the appropriate cylinders.
  14. Verify the spark tester sparks while attempting to start the engine.
    NOTE:
    • Perform the spark test on at least 3 of the 4 cylinders.
    • An erratic or weak spark is considered a no spark condition.
    1. If the spark tester does not spark 

      Refer to Electronic Ignition System Diagnosis 

    1. If the spark tester sparks 
  15. Verify none of the conditions listed below exist:
    • Air intake duct to the throttle body collapsed
    • Air filter and air intake system restricted/obstructed
    • Spark plugs gas or coolant fouled
    • Skewed manifold absolute pressure (MAP) sensor
    • Skewed engine coolant temperature (ECT) sensor
    • Restricted exhaust system. Refer to Restricted Exhaust
    • Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis 
    • Engine mechanical condition, for example, worn timing chain or low compression. Refer to Symptoms - Engine Mechanical
    1. If a condition exists 

      Repair as necessary.

    1. If no conditions exist 
  16. All OK.
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