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DTC P0108 - MAP SENSOR CIRCUIT HIGH VOLTAGE INPUT (LOW VACUUM) Isuzu Oasis I

Testing & Diagnostics ~328 words
  1. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on. Allow engine to idle. Check MAP sensor using OBD-II scan tool. If 30.0 in. Hg or more, or one volt or more is indicated, go to next step. If 30.0 in. Hg or more, or one volt or more is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at MAP sensor and PCM connectors. See WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect MAP sensor 3-pin connector. Connect a fused jumper wire between MAP sensor harness connector terminals No. 2 (Green/White wire) and No. 3 (Red/Green wire). (Схема №6) Turn ignition on. Check MAP sensor using OBD-II scan tool. If 3 0.0 in. Hg or more, or one volt or more is indicated, go to next step. If 30.0 in. Hg or more, or one volt or more is not indicated, replace MAP sensor.
  3. Turn ignition off. Remove jumper wire from MAP sensor connector. Turn ignition on. Measure voltage between MAP sensor harness connector terminals No. 1 (Yellow/Red wire) and No. 2 (Green/White wire). (Схема №6) If about 5.0 volts exists, go to next step. If about 5.0 volts does not exist, repair open in Green/White wire between PCM 31-pin connector "C" terminal C7 and MAP sensor. See WIRING DIAGRAMS article.
  4. Turn ignition off. Install a fused jumper wire between PCM 31-pin connector "C" terminal C7 (Green/White wire) and terminal C17 (Red/Green wire). (Схема №3) Turn ignition on. Check MAP sensor using OBD-II scan tool. If 30.0 in. Hg or more, or one volt or more is indicated, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM. If 30.0 in. Hg or more, or one volt or more is not indicated, repair open in Red/Green wire between MAP sensor and PCM.

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