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Home >> Isuzu >> 1999 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests (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.
    2. 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 about 4 volts and 90 kPa, go to step  4 . If MAP value reading is not 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 SPECIFIC DTC information. If scan tool indicates DTC P0108 failed, 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 between MAP sensor connector and PCM harness connector terminal for short to voltage. If voltage is indicated, locate and repair short to voltage in MAP sensor input and retest system. If voltage is not indicated, go to step  12 .
  6. Turn ignition off. Disconnect PCM harness connectors. Using a DVOM, check continuity of MAP sensor input circuit between MAP sensor connector and appropriate PCM harness connector terminal. See Figure and Figure . Also, check MAP sensor input circuit for continuity to ground. If continuity does not exist, repair open in MAP sensor input and retest system. If continuity to ground exists, repair short to ground and retest system. If continuity exists, and does not exist to ground, go to next step.
  7. Connect PCM harness connectors. Turn ignition on. Check MAP sensor connector 5-volt reference terminal for voltage. If reading indicates about 5 volts, go to next step. If reading does not indicate about 5 volts, locate and repair open or shorted condition in 5-volt reference circuit. Retest system.
  8. Turn ignition off. Using a fused jumper wire, connect 5-volt reference circuit to MAP sensor input circuit at MAP sensor connector. 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 continuity of MAP sensor ground circuit between MAP sensor connector and appropriate PCM harness connector terminal. If continuity does not exist, repair MAP sensor ground circuit as necessary. If continuity exists, go to next step.
  10. Connect PCM harness connectors. Connect DVOM positive lead to MAP sensor connector 5-volt reference terminal, and negative lead to sensor ground circuit terminal. 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 PCM. Program replacement PCM using required equipment. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. Retest system.
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