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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 4.2L)DIAGNOSTIC TESTSDTC P0201-P0206: FUEL INJECTOR CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada RWD

Diagnostic Procedures

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. 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, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Clear the DTCs with a scan tool. Idle the engine at the normal operating temperature. Monitor the misfire current counters with a scan tool. Are any of the counters incrementing? If yes, go to step  4 . If no, go to next step.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS  .
  4. Turn OFF the ignition. Disconnect the fuel injector harness multi-way connector. Probe the appropriate fuel injector control circuit, PCM side, with a test lamp connected to battery voltage. Crank the engine. Does the test lamp flash when cranking the engine? If yes, go to step  8 . If no, go to next step.
  5. Does the test lamp remain 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 a short to voltage or an open between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step  18 . If no, go to step  14 .
  7. Test the control circuit of the fuel injector for a short to ground between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step  18 . If no, go to step  17 .
  8. Inspect the accessible fuel injector jumper harness between the multi-way connector and the intake manifold for the following:
    • Poor connections at the multi-way connector.
    • Damaged or pinched wiring.
    • Broken wires inside the insulation.

    Did you find and correct the condition? If yes, go to step  18 . If no, go to next step.

  9. Probe the appropriate fuel injector control circuit, fuel injector side, at the multi-way connector, with a test lamp connected to battery voltage. Does the test lamp illuminate? If yes, go to step  15 . If no, go to next step.
  10. With a DMM, test for continuity between the ignition 1 voltage supply terminal and the appropriate fuel injector control circuit terminal, at the multi-way connector. Does the DMM indicate OL? If yes, go to next step. If no, go to step  13 .
  11. Test the control circuit of the fuel injector for an open or for poor connections at the fuel injector. Did you find and correct the condition? If yes, go to step  18 . If no, go to next step.
  12. Test the ignition 1 voltage supply circuit of the fuel injector for an open between the fuel injector and the splice. Did you find and correct the condition? If yes, go to step  18 . If no, go to step  16 .
  13. Test the control circuit of the fuel injector for a short to voltage or a short to another circuit. Did you find and correct the condition? If yes, go to step  18 . If no, go to step  16 .
  14. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  18 . If no, go to step  17 .
  15. Repair the short to ground in the fuel injector control circuit. After repairs, go to step  18 .
  16. Replace the appropriate fuel injector. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  18 .
  17. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  18. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  19. Observe the stored information, Capture Info with a scan tool. 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.