Note On Intermittents

Manipulate circuits No. 472 and 469 wiring, MAT connector, and ECM connector while observing ECM parameter P.0.5. If failure is induced, MAT will jump from its normal value to open signal circuit reading of -26 to -40°F (-32 to -40°C).

Fig 1: Code E38 Schematic - Open Mat Sensor Circuit

Fig 2: Code E38 Flow Chart - Open Mat Sensor Circuit