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Home >> Chevrolet >> 2018 >> Impala Premier, Gas >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (P0340-P2635) And Symptoms) >> 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. Verify that DTC P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0222, P0223, P0231, P0232, P023F, P025A, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0335, P0336, P0351, P0352, P0353, P0354, P0601, P0602, P0603, P0604, P0606, P062B, P062F, P0628, P0630, P0633, P0641, P069E, P06A6, P1248, P1249, P124A, P124B, P1516, P16A0, P16A1, P16A2, P16F3, P2101, P2119, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P262B, or U0109 is not set.
    • Go to next step: If none of the DTCs are set 
  2. Ignition ON.
  3. Verify the security indicator on the instrument panel cluster illuminates momentarily.
    • Go to next step: If the indicator does not stay illuminated and is not flashing 
  4. Verify the scan tool Engine Speed parameter is greater than 0 RPM while cranking the engine.
    • Go to next step: If greater than 0 RPM 
  5. Ignition OFF.
  6. Disconnect the T8 ignition coil from a cylinder and spark plug.
  7. Connect a J 26792  HEI Spark Tester between the boot of the ignition coil and ground.
    8. NOTE:
    • Perform the spark test on at least 3 of the cylinders.
    • An erratic or weak spark is considered a no spark condition.
  8. Verify that the spark tester sparks while cranking the engine.
    • Go to next step: If the spark tester sparks 
    9. 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 down 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.
  9. Ignition ON, command the Fuel Pump Enable On several times with a scan tool.
  10. Verify the Chassis Control Module Fuel Pressure Sensor parameter is between 345 - 690 kPa (50 - 100 psi) while the fuel pump is running.
    • Go to next step: If within the specified value 
    11. 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.

  11. Verify the Chassis Control Module Fuel Pressure Sensor parameter, after the fuel 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.
    • Go to next step: If within the specified range 
  12. Verify correct operation of the fuel injectors. Perform the Fuel Injector Diagnosis  using the Active Fuel Injector Tester and Adapter Kit.
    • If the fuel injectors do not operate correctly 

      Repair or replace as necessary.

    • Go to next step: If the fuel injectors operate correctly 
  13. Verify the conditions listed below do not exist:
  14. All OK
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