LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (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 Saturn Vue. 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 - engine controls, go to next step.
  2. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off 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, go to DIAGNOSTIC AIDS .
  3. Turn ignition off. Remove the air cleaner outlet resonator. Disconnect the fuel injector. Turn ignition on, with engine off. Probe the ignition 1 voltage circuit of the fuel injector with a test light that is 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 the 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 the test light remain illuminated at all times? If yes, go to step  7. If no, go to next step.
  6. Test 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 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 ECM. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  10. Repair the open or short to ground in the ignition 1 voltage circuit of the fuel injector. Replace the fuse as necessary. After repairs, go to step  13.
  11. Replace the affected fuel injector. After replacing injector(s), go to step  13.
  12. Turn ignition off. Replace ECM. Perform ECM relearn procedure. See ELECTRONIC CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing ECM, go to next step.
  13. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the conditions observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  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.
scientia non olet · About LEMON Manuals