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Home >> Isuzu >> 2001 >> Rodeo S, 2.2 D, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Tests >> DTC P0122: TP Sensor Circuit Low Input >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform OBD-II system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK  . After performing OBD-II system check, go to next step.
  2. Turn ignition on. With throttle closed, observe scan tool display. If TP sensor value reading is less than .235 volt, go to step  4 . If TP sensor value is .235 volt or more, 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. If scan tool indicates DTC P0122 RAN AND PASSED, go to DIAGNOSTIC AIDS  . If scan tool does not indicate DTC P0122 RAN AND PASSED, go to next step.
  4. Turn ignition off. Disconnect TP sensor. Using a fused jumper wire, connect TP sensor harness connector Red and Blue wires together. Turn ignition on. If TP sensor reading is about 5 volts, go to step  10 . 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 harness connectors. Check for open or short circuit in Red wire between PCM harness connector terminal A1 and TP sensor harness connector. See Figure and Figure . Repair as necessary and retest system. If no problem was found, 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 harness connectors. Check for faulty circuit in Blue wire between PCM harness connector terminal E8 and TP sensor harness connector. See Figure and Figure . 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. Repair as necessary. If terminals and connections are okay, go to step  12 .
  10. Inspect terminals and harness connectors at TP sensor for poor connections or damaged terminals. 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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