Signal Too High. Intermittent Fault

Signal too high. Intermittent fault

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 supply voltage. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults and for an intermittent open-circuit 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 according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.

Other information
- To replace the intake air temperature (IAT) sensor, see Replacing the intake air temperature sensor Replacing 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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Continue - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking wiring

FAULT FOUND - DONE

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