Code E025: Mat Sensor Circuit (High Temp Indicated)

NOTE: Test numbers refer to test numbers on diagnostic chart.

Code E025 will set if:

Signal voltage indicates manifold air temperature greater than 275°F (135°C).
A vehicle speed is present.
Both of the above requirements are met for at least 16 seconds.

Due to the conditions necessary to set a Code E025, SERVICE ENGINE SOON light will only stay on while fault is present.

Test Number 1) If Code E025 is current, ED23 display may be used to diagnose this fault. If the fault is current, ECM will transmit 148°C as the data value.

Fig 1: Code E024: Circuit Diagram

Fig 2: Code E024: Flow Chart VSS Signal Circuit