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Home >> Cadillac >> 2000 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.0L >> Diagnostic Tests >> DTC P1511: Throttle Control System - Back-Up System Performance >> 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. Diagnose and repair any electronic throttle control related DTCs first. If no other DTCs are set, go to next step.
  3. Inspect throttle body and ensure throttle valve is in closed position. If throttle valve is closed, go to next step. If throttle valve is not closed, go to step  7 .
  4. Using scan tool, monitor TP sensors No. 1 and 2. If TP sensor No. 1 voltage reading is .16-.80 volt and TP sensor No. 2 voltage reading is -4.8 volts, go to step  8 . If TP sensor No. 1 voltage reading is not .16-.80 volt and TP sensor No. 2 voltage is not -4.8 volts, go to next step.
  5. Check TP sensors No. 1 and 2 circuit for open or short to ground. If circuit is faulty, go to next step. If circuit is okay, go to step  8 .
  6. Repair as necessary. After repairs, go to step  9 .
  7. Repair sticking or binding throttle valve. After repairs, go to step  9 .
  8. Replace ECM. Program replacement ECM using required equipment. New ECM must be programmed with frequency code of the theft deterrent module that is currently on vehicle. After replacing ECM, go to next step.
  9. 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 .
  10. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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