Intermittent Fault, Signal Too High

Intermittent fault, signal too high

Checking wiring
Check the engine control module (ECM) and intake air temperature (IAT) sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check in particular for damage or loose terminal pins.
Check the signal cable between engine control module (ECM) terminal #48 and intake air temperature (IAT) sensor terminal 1 for an intermittent short-circuit to ground. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults. Also check for an intermittent open-circuit. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check the ground lead between engine control module (ECM) terminal #79 and intake air temperature (IAT) sensor terminal 2 for an intermittent open-circuit. Remedy if necessary. See Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
If no faults are found in the above fault-tracing try a new intake air temperature (IAT) sensor.

Other information
- To replace the intake air temperature (IAT) sensor, see Replacing the intake air temperature sensor Replacing The Intake Air Temperature Sensor.
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000.













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