Note On Intermittents

Manipulate circuit No. 472 wiring, the MAT sensor and ECM connector while observing ECM parameter P.0.5. If failure is induced, manifold air temperature will jump from its normal value to shorted reading of 291-304°F (144-151°C).

Fig 1: Code E37 Schematic - Shorted Mat Sensor Circuit

Fig 2: Code E37 Flow Chart - Shorted Mat Sensor Circuit