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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Control System & Fuel 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 2008 Buick LaCrosse and 2008 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 vehicle DTC information with a scan tool.
  3. Observe the engine speed parameter while cranking the engine.
    • If engine RPM is not indicated, refer to DTC P0335 .
  4. Install a J 26792  HEI Spark Tester.
  5. Crank the engine for 15 seconds. Spark should be observed from the J 26792  HEI Spark Tester.
  6. 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 .
    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 CH-48027  Digital Pressure Gage. Turn ON the ignition and command the fuel pump ON while observing the CH-48027  . The fuel pressure should be between 384-425 kPa (56-62 psi).
  10. Inspect for the following conditions:
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