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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 452 (Engine Controls - Self-Diagnostics - 6.0L Bi-Fuel & CNG) >> Diagnostic Tests >> DTC P0611: Fuel Injector Control Module Performance >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Alternative Fuels - Engine Controls. If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ALTERNATIVE FUELS - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on, with engine OFF. Using a scan tool, clear the DTC information. Attempt to start and idle the engine. Using a scan tool, observe the DTC information. If DTC P0611 resets, go to next step. If DTC P0611 does not reset. see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn ignition off. Disconnect the FICM harness connector. Turn ignition on, with engine off. Probe the FICM ignition feed circuit with a test light connected to a good ground. If the test light illuminates, go to next step. If the test light does not illuminate, go to step  5.
  4. Probe the FICM ground circuits with a test light connected to battery positive. If the test light illuminates for both ground circuits, go to step  7. If the test light does not illuminate for both ground circuits, go to step  6.
  5. Repair the open or short to ground on the FICM ignition feed circuit. After repairs are complete, go to step  9.
  6. Repair the open on the FICM ground circuit. After repairs are complete, go to step  9.
  7. Test for an intermittent and/or a poor connection at the control module. Did you find and an intermittent and/or poor connection? If yes, go to step  9. If no, go to next step.
  8. Replace the FICM. After replacement is complete, go to next step.
  9. Turn the ignition off for 30 seconds. Turn ignition on, with engine off. If the DTC failed this ignition cycle, go to step  2. If the DTC did not fail this ignition cycle, go to next step.
  10. Observe the Capture Info using a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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