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12.16 - Fuel Fail 16 : intake air temp sensor out of range ( Brett Gadzinsky,  )


Conditions for flagging : signal to ECM under .1 or over 4.9 volts for 69 milliseconds. Default setting 86F if FF 16 is flagged.

Possible faults :

Dirty connection at air temp sensor,
High resistance or short between air temp sensor and ecu,
Bad intake air temp sensor.

The intake air temp sensors function is to retard the ignition timing during intake air temp rise to prevent detonation. The intake air temp sensor resistance reads he same as the coolant temp sensor.

14F 9200 ohms
32F 5900 ohms
50F 3700 ohms
68F 2500 ohms
86F 1700 ohms
104F 1180 ohms
122F 840 ohms
140F 600 ohms
158F 435 ohms
176F 325 ohms
193F 250 ohms
212F 190 ohms

At high engine loads, the air intake temp sensor retards the timing 2.25 degrees every 10C above 86F (30C), at light loads, it retards the timing starting at a higher temperature. It has NO effect on mixture.

The intake air temp sensor is located on the top of the elbow.


 

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