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Diagnostic Trouble Code: P0117
Diagnostic Trouble Code Name: Engine Coolant Temperature Sensor (ECT) circuit low input
Vehicle Make: Ford
Vehicle Model: Falcon (AU)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Gen F-Term Diag (Key on)
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTCP0622
Circuit / System Description
The engine control module (ECM) uses the generator field duty cycle signal circuit to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to the high side of the field winding in the generator. A pulse width modulated (PWM) high side driver in the voltage regulator turns the field winding ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads.
The ECM monitors the state of the generator field duty cycle signal circuit. When the key is in the RUN position and the engine is OFF, the ECM should detect a duty cycle near 0?percent. However, when the engine is running, the duty cycle should be between 5?percent and 100?percent. The ECM monitors the PWM signal using a key ON test and a RUN test. During the tests, if the ECM detects an out of range PWM signal, DTC?P0622 will set. When the DTC sets, the ECM will send a serial data message to the driver information center (DIC) to display a warning message.
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