Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




- Diagnostic trouble code (DTC) CI-121 is stored if the combined instrument panel receives a signal from the engine control module (ECM) which corresponds to a temperature lower than -45 °C (low frequency) or higher than +150 °C (high frequency).

Possible source

Note! An accessory immobilizer with separate plastic key can cause diagnostic trouble code (DTC) CI-121 if the ignition is switched on before the immobilizer has been deactivated. This type of diagnostic trouble code (DTC) is not included in fault-tracing.

- Short-circuit to battery voltage in signal cable
- Short-circuit to ground in signal cable.
- Open-circuit in signal cable
- Fault in ignition/fuel injection system.
- Large contact resistance.
- loose connections

Fault symptom[s]
- The engine coolant temperature (ECT) gauge constantly displays lowest temperature.