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Home >> Cadillac >> 1996 >> Eldorado Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0121 - TP Sensor Circuit Insufficient Activity >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on. Using scan tool, select FAILURE REC. under DTC mode and note DTC P0121 display. If snapshot TP sensor reading is greater than 85 degrees, diagnose using DTC P0123 test. If TP snapshot reading is less than 85 degrees, go to next step.
  3. If snapshot TP sensor reading is less than -5 degrees, diagnose using DTC P0122 test. If snapshot TP sensor reading is greater than -5 degrees, go to next step.
  4. Replace TP sensor.
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