Note On Intermittents

Manipulate circuit No. 472 wiring, MAT sensor and PCM connector while observing PCM parameter P.0.5. If failure is induced, manifold air temperature will jump from its normal value to shorted reading of 288-304°F (142-151°C).

Fig 1: PCM Code E37 Schematic - Shorted MAT Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E37 Flow Chart - Shorted MAT Sensor Circuit

Courtesy of GENERAL MOTORS CORP.