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Home >> Oldsmobile >> 2004 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Control System & Engine Component Tests - 2.2L) >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L SONOMA & S10 PICKUP article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Is DTC P0201, P0202, P0203 or P0204 set? If yes, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 2.2L SONOMA & S10 PICKUP article. If no, go to next step.
  3. Turn ignition off. Disconnect fuel injector harness connector. Turn ignition on, with engine off. Using a test light connected to ground, probe fuel injector ignition 1 voltage circuit (fuse side). Does test light illuminate? If yes, go to next step. If no, go to step  5.
  4. Using a DVOM, measure resistance from the ECM 1 fuse to the ignition 1 voltage circuit terminal of a fuel injector. Is resistance greater than 5 ohms, go to step  6. If no, problem is intermittent.
  5. Repair open in the ignition 1 voltage circuit of the fuel injectors. After repairs, go to step  7.
  6. Repair high resistance in the ignition 1 voltage circuit of the fuel injectors. After repairs, go to next step.
  7. Operate the system in order to verify the repair. Did you correct the condition? If yes, system is okay. If no, go to step  3.
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