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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1276: Accelerator Pedal Position (App) Sensor No. 1 Performance ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Check if DTC P1518 is also set. If DTC P1518 is set, diagnose DTC first. See DTC P1518: THROTTLE ACTUATOR CONTROL (TAC) MODULE SERIAL DATA CIRCUIT ("Y" BODY) . If DTC P1518 is not set, go to next step.
  3. DO NOT depress accelerator pedal. Start and operate engine at idle. Using scan tool, monitor DTC information. If any other TAC module or APP sensor DTCs set (except P1125), go to applicable DTC test. If no other DTCs are set, go to next step.
  4. Using scan tool, monitor APP SENSOR DISAGREE parameter. If scan tool indicates YES for any of the parameters, go to step  6. If scan tool does not indicate YES for any of the parameters, go to next step.
  5. Using scan tool, monitor angle of APP sensors No. 1, 2 and 3. Slowly depress accelerator pedal to WOT position stopping briefly at about 25, 50 and 75 percent positions. Slowly return to closed position, stopping briefly at about 75, 50 and 25 percent positions. If APP sensor No. 1 angle corresponds to APP sensors No. 2 and 3 angles, see DIAGNOSTIC AIDS . If APP sensor No. 1 angle does not correspond to APP sensors No. 2 and 3, go to next step.
  6. Turn ignition off. Disconnect APP sensor harness connector. Using a jumper wire, jumper APP sensor No. 1 5-volt reference circuit to a known-good ground. Turn ignition on, with engine off. Using scan tool, monitor TP sensor No. 1 voltage. If scan tool indicates zero volts, go to next step. If scan tool does not indicate zero volts, go to step  11.
  7. Jumper APP sensor No. 1 5-volt reference circuit to APP sensor No. 1 ground circuit. If scan tool indicates zero volts, go to next step. If scan tool does not indicate zero volts, go to step  12.
  8. Jumper APP sensor No. 1 signal circuit to APP sensor No. 1 5-volt reference circuit. If scan tool indicates 5 volts, go to step  14. If scan tool does not indicate 5 volts, go to next step.
  9. Leave ignition on. Check resistance between APP sensor No. 1 signal circuit to all other circuit in APP sensor connectors. If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step  13.
  10. Turn ignition off. Disconnect both TAC module harness connectors. Check continuity between APP sensor No. 1 signal circuit to all other circuits at both TAC module harness connectors. If continuity exists, go to step  17. If continuity does not exist, go to step  15.
  11. Turn ignition off. Disconnect TAC module harness connector containing APP circuits. Check resistance of APP sensor No. 1 5-volt reference circuit. If resistance is 0-5 ohms, go to step  15. If resistance is not 0-5 ohms, go to step  16.
  12. Turn ignition off. Disconnect TAC module harness connector containing APP circuits. Check resistance of APP sensor No. 1 ground circuit. If resistance is 0-5 ohms, go to step  15. If resistance is not 0-5 ohms, go to step  16.
  13. Turn ignition off. Disconnect TAC module harness connector containing APP circuits. Check resistance of APP sensor No. 1 signal circuit. If resistance is 0-5 ohms, go to step  15. If resistance is not 0-5 ohms, go to step  16.
  14. Check for poor connections at APP harness connector. Repair as necessary. After repairs, go to step  20. If connections are okay, go to step  18.
  15. Check for poor connections at TAC module harness connector. Repair as necessary. After repairs, go to step  20. If connections are okay, go to step  19.
  16. Repair open or excessive resistance in affected circuit. After repairs, go to step  20.
  17. Repair shorted circuits that displayed continuity. After repairs are complete, go to step  20.
  18. Replace accelerator pedal assembly. After replacing pedal assembly, go to step  20.
  19. Replace TAC module. After replacing module, go to next step.
  20. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  21. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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