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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (Engine Control System - 3.8L - Troubleshooting & Diagnosis) >> Engine Cranks but Does Not Run >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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 Engine DTC information with a scan tool.
  3. Observe the engine speed parameter while cranking the engine.
  4. Install a spark tester.
  5. Crank the engine for 15 seconds. Spark should be observed from the Spark Tester.
  6. With the ignition ON and the engine OFF, test the fuses that are supplied by the powertrain relay for voltage. The test lamp should illuminate at each test point for the following fuses:
    • Emission Fuse
    • Ignition 1 Fuse
      • If the testlamp does not illuminate on at least one side of each fuse refer to DTC P0685 .
    7. IMPORTANT: Additional DTCs may set when using the fuel pump output control.
  7. Command the fuel pump ON and OFF. Fuel pump should energize when commanded ON and De-energize when commanded OFF
  8. Turn OFF the ignition.
  9. Install the J 34730-1A  Fuel Pressure Gage. Turn ON the ignition and command the fuel pump ON while observing the J 34730-1A  . The fuel pressure should be between 384-425 kPa (56-62 psi).
  10. Inspect for the following conditions:
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