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Home >> Cadillac >> 2000 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.0L >> Diagnostic Tests >> DTC P1530: TAC Module Internal Circuit >> 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. Turn ignition on, with engine off. Check throttle valve. If throttle valve is fully closed, go to next step. If throttle valve is not fully closed, go to step  5 .
  3. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Recheck DTCs. If this DTC resets, go to next step. If this DTC does not reset, problem is intermittent.
  4. Turn ignition off. Disconnect ECM and TP sensor harness connectors. Check TP sensor circuit for high resistance, open circuit, short to ground or short to other circuit. Check for poor terminal contact at ECM connector. Repair as necessary. After repairs, go to step  7 . If circuit and terminals are okay, go to step  6 .
  5. Replace throttle body assembly. After replacing throttle body, go to step  7 .
  6. Replace ECM. Program replacement ECM using required equipment. New ECM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing ECM, go to next step.
  7. 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 .
  8. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs.
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