2002 Chevy Cavalier Where is the throttle sensor A

Tiny
JAYSON78HAMER
  • MEMBER
  • 2002 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • MANUAL
  • 122,000 MILES
My wifes car has been hesitaiting for the last two months. She took it to sears and they said it needed spark plugs and an air filter. That did not fix the problem. I had changed the spark plugs just six months before. She then took the car somewhere else. They changed the spark plug wires and cleaned the injectors and that still did not fix the problem. I got back from a business trip and took the car to advance auto parts. They said the pedal position sensor A circuit low input, Code- P0122 was showing on the diagnostic test. Is that the same thing as the throttle sensor and where exactly is it located? Thank you for your help.
Jason
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Saturday, November 29th, 2008 AT 8:04 PM

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Tiny
BMRFIXIT
  • EXPERT
SELF-DIAGNOSTICS - 2.2L GASOLINE -2002 Chevrolet Cavalier
TPS located on the throttle body assembly

DTC P0122: TP SENSOR CIRCUIT - LOW VOLTAGE
Description
The Throttle Position (TP) sensor is used by the Powertrain Control Module (PCM) to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with 3 circuits: A 5-volt reference circuit, low reference circuit and signal circuit.
The PCM provides the TP sensor with a 5-volt reference circuit and a low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1 volt to greater than 4 volts through the TP sensor signal circuit. If the PCM detects an very low signal voltage, this DTC will set.
Conditions For Running DTC
The ignition is ON.

Conditions For Setting DTC
? TP sensor signal voltage is less than 0.1 volt.
? Condition is present for longer than 2 seconds.

Actions Taken When DTC Sets
? The control module illuminates the Malfunction Indicator Light (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
? The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions For Clearing MIL/DTC
? The control module turns OFF the Malfunction Indicator Light (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
? A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
? A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
? Clear the MIL and DTC with a scan tool.

Diagnostic Procedures
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. Install scan tool. Turn ignition on, with engine off. With a scan tool, observe the TP voltage parameter. Does the scan tool indicate that the TP sensor voltage is less than 0.1 volt? If yes, go to step 4. If no, go to next step. 3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Operate the vehicle within the Conditions for Running the DTC or within the conditions in the Freeze Frame/Failure Records. See CONDITIONS FOR RUNNING DTC. Does the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS. 4. Turn ignition off. Disconnect TP sensor harness connector. Connect a fused jumper wire between the TP sensor 5-volt reference circuit and the TP sensor signal circuit at the TP sensor harness connector. Turn ignition on, with engine off. With a scan tool, observe the TP sensor voltage parameter. Does the scan tool indicate TP sensor voltage at 5 volts? If yes, go to step 10. If no, go to next step. 5. With a Digital Multimeter (DMM), test the TP sensor 5-volt reference circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step 14. If no, go to next step. 6. Test all 5-volt reference circuits for a short to ground. Did you find and correct the condition? If yes, go to step 14. If no, go to next step. 7. Connect a DMM between the TP sensor 5-volt reference circuit and the TP sensor low reference circuit. Observe the voltage while disconnecting all sensors, one at a time, that use a 5-volt reference signal. A change in voltage indicates the faulty component. Replace that component as necessary. Did you find and correct the condition? If yes, go to step 14. If no, go to next step. 8. With a DMM, test the TP sensor signal circuit for an open, high resistance, or short to ground. Did you find and correct the condition? If yes, go to step 14. If no, go to next step. 9. Inspect for faulty connections at the PCM harness connector. Did you find and correct the condition? If yes, go to step 14. If no, go to step 13. 10. Test the TP sensor 5-volt reference circuit for high resistance. Did you find and correct the condition? If yes, go to step 14. If no, go to next step. 11. Inspect for faulty connections at the TP sensor harness connector. Did you find and correct the condition? If yes, go to step 14. If no, go to next step.
12. Replace TP sensor. When complete, go to step 14.
13. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING under PROGRAMMING. After replacing PCM,

go to next step.
14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step 2.
15. Using scan tool, observe stored information. Does scan tool display any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS. If no, system is okay.
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Saturday, November 29th, 2008 AT 9:14 PM

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