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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Engine Controls - System & Component Tests - 2.2L) >> Fuel Systems (Gasoline) >> Fuel Injector Circuit Diagnosis >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  2. Is DTC P0201, P0202, P0203, or P0204 set? If yes, go to DTC P0201-P0204: INJECTOR CONTROL CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article. If no, go to next step.
  3. Turn ignition switch to OFF position. Remove the air cleaner outlet resonator. Disconnect a fuel injector harness connector. Turn ignition switch to RUN position, engine OFF. Probe the fuel injector ignition 1 voltage circuit, fuse side, using a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  5.
  4. Remove the F/P-INJR (Alero and Grand Am) or F/P-INJ (Cavalier and Sunfire) fuse. Measure the resistance from the fuse to the fuel injector ignition 1 voltage circuit terminal using a DMM. Is the resistance more than 5 ohms? If yes, go to step  6. If no, go to DIAGNOSTIC AIDS .
  5. Repair the open in the appropriate fuel injector ignition 1 voltage circuit. After repair, go to step  7.
  6. Repair the high resistance in the appropriate fuel injector ignition 1 voltage circuit. After repair, go to next step.
  7. Operate the system to verify the repair. Did you correct the condition? If yes, system is okay at this time. If no, go to step  2.
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