Note On Intermittents

Manipulate circuit No. 472 wiring, MAT sensor and ECM connector while observing ECM 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: ECM Code EO37 Circuit Diagram

Fig 2: ECM Code EO37 Flow Chart