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Home >> Isuzu >> 2000 >> Rodeo LS, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P0122: TP Sensor Circuit Low Input >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on. With throttle closed, observe scan tool display. If TP sensor value reading is about 0.22 volt or less, go to step  4. If TP sensor value is more than about 0.22 volt, go to next step.
  3. Review and record FAILURE RECORDS data on scan tool. Operate vehicle within FAILURE RECORDS conditions specified. Using scan tool, monitor specified DTC information for DTC P0122. If scan tool indicates DTC P0122 failed, go to next step. If scan tool does not indicate DTC P0122 failed, go to DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect TP sensor. Using a fused jumper wire, connect TP sensor harness connector Red wire (5-volt reference) and Blue wire (sensor input) together. Turn ignition on. If TP sensor reading is about 5 volts, go to step  11. If reading is not as specified, go to next step.
  5. Disconnect jumper wire. Connect a test light between positive battery terminal and TP sensor harness connector Blue wire. If TP sensor value reading on scan tool is about 5 volts, go to next step. If TP sensor value does not read about 5 volts, go to step  8.
  6. Turn ignition off. Disconnect PCM. Check for open or shorted 5-volt reference circuit between PCM Red 32-pin harness connector terminal A1 and TP sensor harness connector (Red wire). Repair as necessary. Retest system. If 5-volt reference circuit is okay, go to next step.
  7. Inspect terminals of PCM, TP sensor and harness connectors for poor connection or damaged terminals. Repair as necessary. If terminals and connections are okay, go to step  12.
  8. Turn ignition off. Disconnect PCM. Check for faulty TP sensor input circuit between TP sensor harness connector and PCM White 32-pin harness connector terminal E8 (Blue wire). Repair as necessary. Retest system. If no problem was found, go to next step.
  9. Inspect terminals and harness connectors at PCM for poor connections or damaged terminals. See Figure. Repair as necessary. If terminals and connections are okay, go to next step.
  10. Inspect terminals and harness connectors at TP sensor for poor connections or damaged terminals. See Figure. Repair as necessary. If terminals and connections are okay, go to next step.
  11. Replace TP sensor. Retest system.
  12. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
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