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Home >> Pontiac >> 2000 >> Firebird Formula, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P1515: Control Module Throttle Actuator Position Performance ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

  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. If DTC P1120, P1220 and P1221 are also set, diagnose these affected DTCs first. If these DTCs are not set, go to next step.
  3. Turn ignition off for 15 seconds. Turn ignition on, with engine off. Using scan tool in TAC DATA LIST option, monitor TP sensors No. 1 and No. 2 angles. Slowly depress accelerator pedal to wide open throttle. Slowly return to closed throttle. If TP angles increase (about 100 percent) as throttle blade is opened and decrease as throttle is closed, see DIAGNOSTIC AIDS . If TP angles does not increase, go to next step.
  4. Turn ignition off. Disconnect Throttle Actuator Control (TAC) harness connector. Turn ignition on, with engine off. Check voltage between TAC motor high and low circuits at TAC harness connector terminals. If voltage reading is 7.5-8.5 volts, go to step  15. If voltage reading is not 7.5-8.5 volts, go to next step.
  5. Check voltage between ground and TAC motor high and low circuits at TAC harness connector. If any voltage is present, go to step  9. If no voltage is present, go to next step.
  6. Check continuity on each TAC motor high and low circuits between TAC harness connector and TAC module harness connector. If continuity exists, go to next step. If continuity does not exist, go to step  10.
  7. Check for short to ground on each TAC motor high and low circuits. If circuit is shorted, go to step  11. If circuit is okay, go to next step.
  8. Check for continuity between each TAC motor high and low circuits and all other circuits in the TAC module connector. If continuity exists, go to step  12. If continuity does not exist, go to step  13.
  9. Repair short to voltage on affected circuit. After repairs, go to step  17.
  10. Repair open or high resistance on affected circuit. After repairs, go to step  17.
  11. Repair short to ground on affected circuit. After repairs, go to step  17.
  12. Repair circuits that are shorted together. After repairs, go to step  17.
  13. Check for poor connections at TAC module connectors. Repair as necessary. After repairs, go to step  17. If connections are okay, go to next step.
  14. Replace TAC module. After replacing module, go to step  17.
  15. Check for poor connections at TAC connectors. Repair as necessary. After repairs, go to step  17. If connections are okay, go to next step.
  16. Replace throttle body assembly. After replacing throttle body, go to next step.
  17. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions that set 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.
  18. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs.
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