PINPOINT TEST T: NO OPERATION IN LOWER SPEEDS — MANUAL CLIMATE CONTROL
PINPOINT TEST U: NO OPERATION IN SOME BLOWER SPEEDS — EATC
Is the resistance less than 5 ohms?
Test Step Result / Action to Take
T1 CHECK CIRCUIT 261 (OG/BK)
Ignition OFF.
Disconnect: Blower Motor C2004.
Disconnect: Blower Motor Resistor C293.
Measure the resistance between the blower motor C2004, circuit 261 (OG/BK) and the blower motor resistor
C293 pin 2, circuit 261 (OG/BK).
Is the resistance less than 5 ohms?
Yes
GO to T2.
No
REPAIR circuit 261 (OG/BK). TEST the system for normal
operation.
T2 CHECK CIRCUIT 57 (BK)
Measure the resistance between the blower motor resistor C293 pin 3, circuit 57 (BK) and ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new blower motor resistor (19A706). TEST the
system for normal operation.
No
REPAIR circuit 57 (BK). TEST the system for normal
operation.
Test Step Result / Action to Take
U1 CHECK THE BLOWER OPERATION
Ignition ON.
Press the MAX A/C button and rotate the blower motor speed control to HI.
Does the blower speed increase as you rotate the blower motor speed override control toward HI?
Yes
The system is functioning correctly.
No
GO to U2.
U2 CHECK FOR DISCONTINUITIES IN THE CONTROL SIGNAL
Ignition OFF.
Without disconnecting the blower motor speed control C271a from the blower motor speed control, measure the voltage
between the blower motor speed control C271a pin 3, circuit 776 (OG/BK) and ground.
Ignition ON.
Press the MAX A/C button and adjust the blower motor speed to maximum.
Slowly adjust the blower motor speed to minimum while observing the voltmeter. Watch for discontinuities in the voltage as it
decreases. The voltage should decrease in steps from 5 volts to a point less than 1 volt.
Yes
INSTALL a new blower motor speed control.
TEST the system for normal operation.
No
GO to U3.
2003 Taurus/Sable Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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