HINT
When any of these DTCs are set, check the engine coolant temperature by entering the following menus on the Techstream:
Powertrain / Engine / Data List / Coolant Temp.
MONITOR DESCRIPTION
The resistance of the engine coolant temperature sensor varies in proportion to the actual engine coolant temperature. The ECM supplies a constant
voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output varies according to the changing resistance of
the sensor. After the engine is started, the engine coolant temperature is monitored through this signal. If the engine coolant temperature sensor
indicates that the engine is not yet warm enough for closed loop fuel control, despite a specified period of time having elapsed since the engine was
started, the ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.
Example:
The engine coolant temperature is 0锟斤拷C (32锟斤拷F) at engine start. After about 1 minute running time, the engine coolant temperature sensor still indicates
that the engine is not warm enough to begin closed loop fuel (air fuel ratio feedback) control. The ECM interprets this as a malfunction in the sensor
or cooling system and sets the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
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