Circuit Description The intake manifold air temperature sensor is used by the electronic control module (ECM) to monitor the temperature of the engine intake air. The intake air temperature is used by the ECM for the engine protection system, and the timing and fueling control. Component Location The intake manifold temperature sensor is located on the side of the intake manifold, toward the rear of the cylinder head, near cylinder No. 6.
Shop Talk This is a warning fault code. If the intake manifold air temperature continues to rise, Fault Code 155 will become active and shut down the engine.
Possible causes: 1) clogged, dirty, inadequate capacity air cleaner element 2) faulty fan clutch 3) intake restriction 4) 010-031 in the Troubleshooting and Repair Manual, ISB Engines, Bulletin No. 3666193.
