Note On Intermittents

WARNING: This page is about a different car, the 1992 Cadillac Seville and 1992 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Manipulate circuit No. 472 wiring, MAT sensor and PCM connector while observing PCM parameter ED05. If failure is induced, manifold air temperature will jump from its normal value to shorted reading of 142-151°C. If wiring and connectors are okay, substitute a known good sensor, and retest.

Fig 1: PCM Code E037, Schematic, Shorted MAT Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E037, Flow Chart, Shorted MAT Sensor Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E037