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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.8L)DIAGNOSTIC TESTSDTC P0121: TP SENSOR PERFORMANCEDIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada RWD

Diagnostic Procedures

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If any other DTCs are set, diagnose those DTCs first.
  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. Turn ignition on, engine off. Using scan tool, observe TP sensor angle parameter while slowly opening throttle to WOT. Parameter should be at zero percent at closed throttle and 98 percent at WOT. Does TP angle increase steadily and evenly from closed throttle value to more than wide open throttle value? If yes, go to next step. If no, go to step  4.
  3. Observe FREEZE FRAME/FAILURE RECORDS for this DTC. Turn ignition off for 30 seconds. Operate vehicle within Conditions for Running DTC or as close to FREEZE FRAME/FAILURE RECORDS as possible. Does DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect TP sensor connector. Turn ignition on, engine off. Using scan tool, observe TP sensor voltage parameter. Does scan tool indicate TP sensor voltage is zero? If yes, go to next step. If no, go to step  6.
  5. Turn ignition off. Connect a fused jumper wire between the 5-volt reference circuit and the signal circuit at the TP sensor harness connector. Turn on the ignition, with the engine off. Observe the TP sensor voltage parameter with a scan tool. Does the scan tool indicate TP sensor voltage at 5 volts? If yes, go to step  9. If no, go to step  7.
  6. Test the TP sensor signal circuit for a short to voltage with the DMM. Did you find and correct the condition? If yes, go to step  15. If no, go to step  12.
  7. Test the TP sensor 5-volt reference circuit for an open or for high resistance with the DMM. Did you find and correct the condition? If yes, go to step  15. If no, go to next step.
  8. Test the TP sensor signal circuit for an open or for high resistance. Did you find and correct the condition? If yes, go to step  15. If no, go to step  11.
  9. Test the TP sensor low reference circuit for an open or for high resistance. Did you find and correct the condition? If yes, go to step  15. If no, go to next step.
  10. Test the TP sensor 5-volt reference circuit for high resistance. Did you find and correct the condition? If yes, go to step  15. If no, go to next step.
  11. Inspect for a poor connection at the TP sensor harness connector. Did you find and correct the condition? If yes, go to step  15. If no, go to step  13.
  12. Inspect for a poor connection at the Powertrain Control Module (PCM) harness connector. Did you find and correct the condition? If yes, go to step  15. If no, go to step  14.
  13. Replace TP sensor. After repairs, go to step  15.
  14. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  15. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  16. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
RENDER: 1.0x

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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.