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Home › Isuzu › 1999 › Rodeo LS, 2.2 D › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics - Tests (2.2L) › Diagnostic Trouble Code Identification › DTC P0106: Map Sensor System Performance › Diagnostic Procedures

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. With ignition on and engine off, review and record FAILURE RECORDS data on scan tool, then clear the DTCs. Operate vehicle within conditions noted in FAILURE RECORDS data. Monitor SPECIFIC DTC information. If scan tool indicates DTC P0106 RAN AND PASSED, go to next step. If scan tool does not indicate DTC P0106 RAN AND PASSED, go to step  4 .
  3. Check for the following conditions: MAP sensor seal missing or damaged; vacuum hoses disconnected, damaged or incorrectly routed, intake manifold vacuum leaks, throttle body leaks, and EGR valve flange and pipe leaks. Repair as necessary. Retest system. If no problem is found, see DIAGNOSTIC AIDS  .
  4. Disconnect MAP sensor connector and observe MAP value displayed on scan tool. Normal reading would show zero volts and 10.3 kPa. If reading is normal, go to step  6 . If reading is not normal, go to next step.
  5. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Using a DVOM, check for short to voltage in MAP sensor input circuit between MAP sensor connector and appropriate PCM harness connector terminal. See Figure and Fig 1 . If voltage is indicated, locate and repair as necessary. If no voltage is indicated, go to step  12 .
    Fig 1: Identifying PCM Wiring Harness Connectors & Terminals
    G98G12696Courtesy of ISUZU MOTOR CO.
  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. Also, check Gray wire for continuity to ground. If continuity does not exist in input circuit, repair open. If continuity to ground exists in Gray wire, repair short to ground. 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.
  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 MAP sensor connector 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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