Signal Too High - Permanent Fault

ECM-1200 INTAKE AIR TEMPERATURE (IAT) SENSOR INLET
SIGNAL TOO HIGH - PERMANENT FAULT

Checking wiring and components



Check the Intake Air Temperature (IAT) sensor resistance.

Check signal cable between control module #A5 (#A5) and intake air temperature sensor # 1 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault

Hint: With the ignition on and the Intake Air Temperature (IAT) sensor connector disconnected, the voltage between #1 and ground should be approximately 5 V.

Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, Connecting the Breakout Box (ECM)
- To access/replace the Intake Air Temperature (IAT) sensor, Intake Air Temperature Sensor, Replacing
- For resistance values, see Component Specifications. Specifications
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect the connectors, reinstall components etc.
- Ignition on.
- Read Intake Air Temperature (IAT) sensor signal. The Intake Air Temperature (IAT) sensor is integrated into the Mass Air Flow (MAF) sensor.
Check that the signal is OK according to the table value.




Is the signal OK?
Yes - Testing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault tracing for this diagnostic trouble code (DTC) or make another attempt.