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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1977 (Engine Controls And Fuel - 3.6L (Ly7) - Troubleshooting & Diagnosis) >> Engine Cranks But Does Not Run >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Crank the engine for up to 30 seconds.
  2. Observe the vehicle DTC information with a scan tool.
    • If any of the following DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose those DTCs: P0016, P0201-P0206, P0230, P0231, P0232, P023F, P025A, P0335, P0336, P0351-P0353, P0449, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P069E, P0685, P0690, P1516, P1682, P2610, P2635.
  3. Ignition OFF for 90 seconds, determine the current vehicle testing altitude. Ignition ON, observe the scan tool MAP Sensor parameter. Compare the parameter to the Altitude Versus Barometric Pressure . The MAP Sensor Pressure parameter should be within the specified range indicated in the table.
    • If the reading is not correct for your altitude, diagnose the MAP sensor. Refer to DTC P0106 .
  4. Verify the following scan tool parameters indicate OK when the engine is cranked:
    • Cylinder 1-6 Injector Circuit Short to Ground Test Status
    • Cylinder 1-6 Injector Circuit Open Test Status
  5. Verify that the Cylinder 1-6 Injector Circuit Short to Volts Test Status scan tool parameter changes from Not Run to OK, when the engine is cranked.
  6. Observe the engine speed parameter while cranking the engine.
    • If engine RPM is not indicated, refer to DTC P0335 .
  7. Install a J 26792 (SA 91992):  Spark Tester.
  8. Crank the engine for 15 seconds. Spark should be observed from the J 26792 (SA 91992):  Spark Tester.
  9. With the ignition ON and the engine OFF, test the fuses that are supplied by the powertrain relay for voltage.
    • If the test lamp does not illuminate on at least one side of each fuse, refer to DTC P0685 or P0690 .
  10. Turn OFF the ignition.
    11. NOTE: Additional DTCs may set when using the fuel pump output control.
  11. Install the CH 48027:  Gage or CH 48027-100:  Gage. Turn ON the ignition and command the fuel pump ON while observing the CH 48027:  Gage or CH 48027-100:  Gage. The fuel pressure should be between 384-425 kPa (56-62 psi).
  12. Inspect for the following conditions:
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