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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 P0108: Map Sensor Circuit High 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.
    NOTE: If 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) for short to voltage between MAP sensor connector and PCM harness connector terminal F8. See Figure and Figure . 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 harness connector and PCM 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 Gray/Red wire (5-volt reference) and PCM harness connector terminal B1. 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 Gray/Red and Gray wires 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 Gray/Black wire between MAP sensor harness connector and PCM harness connector terminal D9. See Figure and Figure . Repair as necessary. If no problem was found, go to next step.
  10. Connect PCM harness connectors. Connect DVOM between MAP sensor harness connector Gray/Red wire and Gray/Black wire. 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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