Diagnostic Aids

When replacing IAT sensor, refer to TEMPERATURE TO RESISTANCE VALUES table to evaluate possibility of a "shifted" sensor. A "shifted" sensor could result in poor driveability complaints. For IAT sensor specification, refer to I - SYS/COMP TESTS article in this section.

Fig 1: Code 25 Schematic Intake Air Temperature Circuit, High Temperature Indicated

Fig 2: Code 25 Flow Chart Intake Air Temperature Circuit, High Temperature Indicated