Note On Intermittents

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 EO37, Schematic, Shorted MAT Sensor Circuit

Fig 2: Flow Chart, PCM Code EO37, Shorted MAT Sensor Circuit