Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




If the engine has been running for 3 minutes and been idling for at least 60 seconds and the control module receives a signal from the intake air temperature sensor corresponding to a temperature lower than -29°C (-20.2°F) or higher than +129°C (264.2°F) the control module interprets it as a fault and ECM-1200 is stored.

Substitute value
+20°C (68°F) Three-way catalytic converter (TWC) preheating and idle air trim diagnostics are disabled.

Possible source

Signal too high:
- short-circuit to ground in the signal cable
- defective temperature sensor

Signal too low:
- open-circuit in the signal cable
- short-circuit to supply voltage in the signal cable
- defective temperature sensor
- contact resistance in terminals

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit