October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnostic Aids

Codes 21 and 23 stored at the same time could be the result of an open in Gray/Yellow wire.

When replacing IAT sensor, check TEMPERATURE TO RESISTANCE VALUES table. A "shifted" sensor could result in poor driveability complaints.

Fig 1: Code 23 - Schematic Intake Air temperature Sensor Circuit, Low Temp. Indicated

Fig 2: Code 23 - Flow Chart Intake Air temperature Sensor Circuit, Low Temp. Indicated