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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Engine Cranks But Does Not Run >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Crank the engine for up to 15 s.
  2. Verify that DTC P0117, P0118, P0122, P0123, P0222, P0223, P0335, P0336, P0513, P0562, P0563, P0601, P0602, P0603, P0604, P0606, P062F, P0633, P0685, P0689, P0690, P1516, P1631, P1682, P16F3, P2101, P2119, or P2610 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Ignition ON.
  4. Verify the security indicator on the instrument cluster illuminates momentarily.
    • Go to next step: 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.
    • Go to next step: If greater than 0 RPM 
  6. Connect the EL-26792  between the boot of a spark plug wire and ground.
    7. NOTE:

    An erratic or weak spark is considered a no spark condition.

  7. Verify the spark tester sparks while cranking the engine.
    • Go to next step: If the spark tester sparks 
  8. Ignition ON.
    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 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.
  9. Command the Fuel Pump Enable On several times with a scan tool.
  10. Verify the scan tool Fuel Pressure Sensor parameter is between 345 - 650 kPa (50 - 94 PSI) with the fuel pump running.
    • Go to next step: If within the specified range 
  11. Verify the scan tool 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 the conditions listed below do not exist:
    • Collapsed air intake duct to the throttle body
    • Air filter and air intake system for restrictions and obstructions
    • Spark plugs for being gas or coolant fouled
    • A skewed manifold absolute pressure (MAP) sensor
    • A skewed engine coolant temperature (ECT) sensor
    • Test the exhaust system for restrictions. Refer to Restricted Exhaust .
    • Test the fuel for contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Engine mechanical condition, for example, worn timing belt or low compression. Refer to Symptoms - Engine Mechanical .
      • If a condition exists 

        Repair as necessary.

      • Go to next step: If no conditions exist 
  13. All OK.
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