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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 106 (ENGINE CONTROLS SELF-DIAGNOSTICS - 6.5L)DIAGNOSTIC TESTSDTC P1654: SERVICE THROTTLE SOON LIGHT CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada AWD

Diagnostic Procedures

2004 Oldsmobile Bravada AWDSECTION Diagnostic Procedures
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. 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. NOTE: Ensure that both the ON and the OFF states are commanded. Repeat the commands as many times as necessary.
  2. Turn ON the ignition, with the engine OFF. Use a scan tool in order to command the lamp ON and OFF. Does the lamp turn ON and OFF with each command? If yes, go to next step. If no, go to step  4 .
  3. The DTC is intermittent. If no additional DTCs are stored, see DIAGNOSTIC AIDS  . If additional DTCs are stored, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  4. Turn OFF the ignition. Disconnect the PCM connector containing the lamp control circuit. Turn ON the ignition, with the engine OFF. Is the lamp OFF? If yes, go to next step. If no, go to step  7 .
  5. With a fused jumper wire connected to ground, probe the lamp control circuit in the PCM harness connector. Does the lamp illuminate? If yes, go to next step. If no, go to step  8 .
  6. Inspect for poor connections at the PCM. If a problem is found, repair as necessary. Did you perform a repair? If yes, go to step  10 . If no, go to step  9 .
  7. The service throttle soon lamp control circuit is shorted to ground. Repair as necessary. After repairs, go to step  10 .
  8. Inspect the service throttle soon circuit for the following conditions:
    • An open ignition feed to the bulb.
    • A malfunctioning bulb.
    • The control circuit open or shorted to battery voltage.
    Repair the problem as necessary. After repairs, go to step  10 .
  9. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  10. Using the scan tool, clear the DTCs. Start engine and idle the engine at the normal operating temperature. Select DTC and the Specific DTC function. Enter the DTC number that was set. Operate the vehicle within the Conditions for Setting DTC until the scan tool indicates the diagnostic ran. Does the scan tool indicate the diagnostic passed? If yes, go to next step. If no, go to step  2 .
  11. 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.