Signal Too High - Intermittent Fault

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

Checking wiring and connectors



Check the control module and Mass Air Flow (MAF) sensor connectors for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults Also check for loose connections according to [1][2]Checking Wiring and Terminals. Intermittent Faults The Intake Air Temperature (IAT) sensor is integrated in the Mass Air Flow (MAF) sensor.

Check the signal cable between control module connector terminal A4 (# A4) and Mass Air Flow (MAF) sensor connector terminal 3 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults Also check for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check the ground lead between control module connector terminal A61 (# B3) and Mass Air Flow (MAF) sensor connector terminal 4 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information:
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the mass air flow (MAF) sensor, Mass Air Flow (MAF) Sensor, Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.