Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-112

Condition




Diagnostic trouble code (DTC) EFI-112 is stored if the engine control module (ECM) detects a fault in the ROM/EPROM memory circuits for the , engine control module (ECM) temperature sensor circuit, knock control circuit (zero test, short term fuel trim test) or engine coolant temperature (ECT) sensor circuit NTC switch.

Substitute value

Fault in the ROM/EPROM memory circuit, engine control module (ECM) temperature sensor circuit:
- no substitute value.
- temperature sensor engine coolant fan low-speed.

Fault in knock control circuit (zero test, integrator test):
- ignition retarded for safety reasons.

Fault in engine coolant temperature (ECT) sensor circuit NTC switch:
- when the engine is started a substitute value of 20°C is adopted, after the engine has been running for a short time a value of 83°C is adopted.
- the engine cooling fan (FC) starts running at low-speed
- idle air trim adaptation disabled
- long-term fuel trim disabled

Possible source
- fault in engine control module (ECM) ROM/EPROM circuits
- fault in engine control module (ECM) temperature sensor circuit
- fault in engine control module (ECM) knock control circuit
- fault in engine control module (ECM) engine coolant temperature (ECT) sensor circuit (NTC switch).

Fault symptom[s]
- none