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Diagnostic Trouble Code: 029
Diagnostic Trouble Code Name: Left Front Window Motor Circuit
Vehicle Make: Daewoo
Vehicle Model: Tosca (V250)
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 2 and 3 Control Circuit
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTCP0481
Circuit / System Description
The following DTCs are for the cooling fan relay control circuits controlled by the engine control module (ECM):
DTC?P0480--low speed cooling fan relay control circuit
DTC?P0481--high speed cooling fan relay control circuit
Ignition?1 voltage is supplied to the cooling fan?1 relay from the IGN?E fuse. The ECM controls the low speed cooling fan relay by grounding the low speed cooling fan relay control circuit.
Ignition?1 voltage is supplied to the cooling fan?2 relay from the IGN?E fuse. The ECM controls the low speed cooling fan relay by grounding the low speed cooling fan relay control circuit.
The ECM grounds the cooling fan relay control circuits through an internal solid state device called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line that is monitored by the ECM. When the ECM is commanding a component ON, the voltage potential of the control circuit should be low, near 0?volts. When the ECM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, the DTC will set.
The ECM will monitor the control circuit for the following:
A short to ground
A short to voltage
An open circuit
An open relay coil
An internally shorted or excessively low resistance relay coil
When the ECM detects any of the above conditions, the DTC will set and the effected driver will be disabled.
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