DTC P1129 - MANIFOLD ABSOLUTE PRESSURE (MAP) HIGHER THAN EXPECTED Isuzu Oasis I

Testing & Diagnostics

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. Using OBD-II scan tool, check manifold absolute pressure. If indicated pressure is 12.8 in. Hg or less, problem is intermittent. System is okay at this time. If indicated pressure is more than 12.8 in. Hg, replace MAP sensor.