X3: Check IAT Sensor Range

NOTE: Use a refrigerator, freezer or freeze spray so that the operation of the sensor can be checked at temperatures below the ambient test temperature.







With the MAF meter plug (PI035) disconnected, measure the resistance between the IAT pins PI035/003 and PI035/004; Refer to 'Air Temperature Sensor.' Testing and Inspection

- Relationship OK?
Yes
GO to X4 X4: Check Continuity Harness
No
Remove sensor and check for correct temperature/resistance relationship at ambient temperature.
Repeat checks for at least 3 different temperatures. Renew as necessary and test the system for normal operation.