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Diagnostic Trouble Code: 129
Diagnostic Trouble Code Name: No Manifold Absolute Pressure (MAP I6) or Mass Air Flow (MAF V8) change in goose
Vehicle Make: Ford
Vehicle Model: Falcon (EL)
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:
Cooling Fan Relay 1 Control Circuit Low Voltage
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0480, P0481, P0691, P0692, P0693, or P0694
Circuit / System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the cooling fan low speed relay. This energizes the coil and applies voltage directly to the right cooling fan through the switch side of the low speed relay. The right cooling fan is connected in series to the left cooling fan through the de-energized series/parallel (S/P) cooling fan speed control relay. The series circuit operates both fans at low speed.
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