Note On Intermittents:

If an intermittent Code EO37 is being set, manipulate the related wiring while observing engine data parameter ED05. If the failure is induced, the "MAT" reading will jump from its normal valve to the "shorted" reading of 142-151°C. This will help to isolate the location of the malfunction.

Fig 1: Code E037, Manifold Air Temperature (MAT) Sensor Too High

Fig 2: Code E037, Schematic