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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0201-P0204: Injector Control Circuit >> 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. After performing diagnostic system check, go to next step.
  2. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF ignition for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC  . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, see DIAGNOSTIC AIDS  .
  3. Turn ignition off. Disconnect fuel injector. Turn ignition on, with engine off. Probe the ignition 1 voltage circuit of the fuel injector with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  10 .
  4. Connect Injector Test Light (J-34730-405) between the control circuit and ignition 1 voltage circuit of the fuel injector. Start engine. Does the test light flash? If yes, go to step  8 . If no, go to next step.
  5. Does test light remains illuminated at all times? If yes, go to step  7 . If no, go to next step.
  6. Test the control circuit of the fuel injector for an open and for a short to voltage. Did you find and correct the condition? If yes, go to step  13 . If no, go to step  9 .
  7. test the control circuit of the fuel injector for a short to ground. did you find and correct the condition? If yes, go to step  13 . If no, go to step  12 .
  8. Test for an intermittent and for a poor connection at the fuel injector. Did you find and correct the condition? If yes, go to step  13 . If no, go to step  11 .
  9. Test for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  13 . If no, go to step  12 .
  10. Repair open or short to ground in the ignition 1 voltage circuit of the fuel injector. Replace fuse as necessary. After repairs, go to step  13 .
  11. Replace affected fuel injector. After replacing fuel injector, go to step  13 .
  12. Replace PCM. After replacing PCM, go to next step.
  13. Use scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC  . Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  14. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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