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HOMESERVICE MANUALSCHEVROLET1995CAVALIER LS, 4D SEDAN, 2.2 4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 14 (ENGINE CONTROLS - TESTS W/CODES - 2.2L)DIAGNOSTIC TROUBLE CODESDTC P0121 - TP SENSOR SYSTEM PERFORMANCEDIAGNOSTIC PROCEDURES
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4

Diagnostic Procedures

1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 1996 Pontiac Sunfire and 1996 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Observing scan tool, depress accelerator to floor, then slowly release pedal. TP sensor angle value should increase steadily to about 95 percent when pedal is depressed and decrease steadily to about 2 percent when pedal is released. If TP sensor angle value is as specified, go to next step. If TP sensor angle value is not as specified, go to step 4).
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. If TP sensor angle value-versus-RPM value is more than specified value in conditions for setting DTC, go to next step. If TP sensor angle value-versus-RPM value is not more than the specified value in conditions for setting DTC, go to step 12).
  4. Disconnect TP sensor connector. Observe TP sensor display on scan tool. If TP sensor voltage is less than .5 volt, go to next step. If TP sensor voltage is .5 volt or more, go to step 6).
  5. Connect a jumper wire between 5-volt reference circuit and signal circuit terminals at TP sensor harness connector. If scan tool voltage is more than 4.5 volts, go to step 7). If scan tool voltage is 4.5 volts or less, go to step 8).
  6. Check TP signal circuit for short to voltage. Repair wiring as necessary. After repair is completed, go to step 12). If circuit is okay, go to step 9).
  7. Check TP sensor ground circuit for high resistance between PCM and TP sensor. Check TP sensor ground circuit for poor connection. Repair as necessary. After repair is completed, go to step 12). If circuit is okay, go to step 10).
  8. Check TP sensor signal circuit for high resistance between PCM and TP sensor connectors. Repair as necessary. After repair is completed, go to step 12). If circuit is okay, go to next step.
  9. Disconnect and inspect TP sensor and PCM connectors. Repair connectors as necessary. After repair is completed, go to step 12). If connectors are okay, go to step 11).
  10. Replace TP sensor. After repair is completed, go to step 12).
  11. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  12. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start and warm engine to normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function then enter DTC P0121. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step 2).
  13. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time.
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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.