Code 25 - Mat Sensor (High Temperature Indicated)

Code No. 25 will set if signal voltage indicates manifold air temperature is greater than 293°F (145°C), engine has operated at least 2 minutes and turbo wastegate control is not operated. The "CHECK ENGINE" light will remain on only while signal voltage is low.

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

If voltage is greater than 4 volts, the ECM and wiring are okay.

Fig 1: Flow Chart - Code 25, Mat Sensor (High Temp. Indicated)

Courtesy of ISUZU MOTOR CO.