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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 P0108: Map Sensor Circuit High Input >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD system check, go to next step.
    NOTE: If the engine idle is rough, unstable or incorrect, repair idle problem before proceeding.
  2. With engine idling, note MAP value on scan tool display. If MAP value reading is more than 4 volts and 90 kPa, go to step  4. If MAP value reading is not more than about 4 volts and 90 kPa, go to next step.
  3. With ignition on and engine off, review and record FAILURE RECORDS data on scan tool. Operate vehicle within FAILURE RECORDS conditions specified. Monitor specified DTC information. If scan tool indicates DTC P0108 failed during this ignition cycle, go to next step. If scan tool does not indicate DTC P0108 failed, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect MAP sensor. Turn ignition on. Observe MAP value displayed on scan tool. If reading is about zero volts and 10.3 kPa, go to next step. If reading is not zero volts and 10.3 kPa, go to step  6.
  5. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Using a DVOM, check MAP sensor input circuit (Gray wire) between MAP sensor connector and PCM White 32-pin harness connector terminal F8 for short to voltage. If voltage is indicated, locate and repair short to voltage in MAP sensor input circuit and retest system. If voltage is not indicated, go to step  12.
  6. Turn ignition off. Disconnect PCM harness connectors. Using a DVOM, check MAP sensor input circuit (Gray wire) between MAP sensor connector and PCM White 32-pin harness connector terminal F8 for open circuit or short to ground. See Figure and Figure . Repair as necessary. If no problem was found, go to next step.
  7. Connect PCM harness connectors. Turn ignition on. Check for faulty circuit between MAP sensor harness connector Red wire (5-volt reference) and PCM Red 32-pin harness connector terminal A1. Repair as necessary. If no problem was found, go to next step.
  8. Turn ignition off. Disconnect MAP sensor. Using a fused jumper wire, connect MAP sensor harness connector Red wire (5-volt reference) and Gray wire (input circuit) together. Turn ignition on. Observe MAP value displayed on scan tool. If reading is about 5 volts and 104 kPa, go to next step. If reading is not as specified, go to step  12.
  9. Turn ignition off. Disconnect PCM harness connectors. Check for faulty circuit in MAP sensor Green wire (ground circuit) between MAP sensor connector and PCM White 32-pin harness connector terminal D8. Repair as necessary. If no problem was found, go to next step.
  10. Connect PCM harness connectors. Connect DVOM between MAP sensor harness connector Red wire (5-volt reference) and Green wire (ground circuit). Turn ignition on. If reading indicates about 5 volts, go to next step. If reading does not indicate about 5 volts, go to step  12.
  11. Replace MAP sensor. Retest system.
  12. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
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