Ford Taurus 2003 - Page 11

A12 CHECK POTENTIOMETER LOW SIDE RESISTANCE
 Drive the actuator to the full clockwise position. Refer to A1.
 Measure the resistance between RCC module C228 pin 9, circuit 437 (YE/LG) and RCC module C228 pin 20,
circuit 438 (RD/WH).
 Is the resistance between 250 and 3,000 ohms?
Yes
GO to A15.
No
If the resistance is greater than 3,000 ohms, GO to A13 .
If the resistance is less than 250 ohms, GO to A14 .
A13 CHECK CIRCUIT 437 (YE/LG) FOR AN OPEN
 Disconnect: Temperature Blend Door Actuator C289.
 Measure the resistance between RCC module C228 pin 9, circuit 437 (YE/LG) and the temperature blend door
actuator C289 pin 1, circuit 437 (YE/LG).
 Is the resistance less than 5 ohms?
Yes
INSTALL a new temperature blend door actuator
(19E616). REFER to Section 412-04. TEST the system
for normal operation.
No
REPAIR circuit 437 (YE/LG) for an open. TEST the
system for normal operation.
A14 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 437 (YE/LG) FOR A SHORT TOGETHER
 Disconnect: Temperature Blend Door Actuator C289.
 Measure the resistance between RCC module C228 pin 20, circuit 438 (RD/WH) and RCC module C228 pin 9,
circuit 437 (YE/LG).
 Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new temperature blend door actuator
(19E616). REFER to Section 412-04. TEST the system
for normal operation.
No
REPAIR circuits 438 (RD/WH) and circuit 437 (YE/LG) for
a short together. TEST the system for normal operation.
A15 CHECK POTENTIOMETER HIGH SIDE RESISTANCE
 Measure the resistance between RCC module C228 pin 5, circuit 436 (RD/LG) and RCC module C228 pin 9,
circuit 437 (YE/LG).
 Is the resistance between 3,000 and 6,000 ohms?
Yes
GO to A17.
No
If the resistance is greater than 6,000 ohms, INSTALL a
new temperature blend door actuator. REFER to Section
412-04. TEST the system for normal operation. If the
resistance is less than 3,000 ohms, GO to A16 .
A16 CHECK CIRCUIT 437 (YE/LG) FOR A SHORT TO CIRCUIT 436 (RD/LG)
 Disconnect: Temperature Blend Door Actuator C289.
 Measure the resistance between RCC module C228 pin 5, circuit 436 (RD/LG) and RCC module C228 pin 9,
circuit 437 (YE/LG).
Yes
INSTALL a new temperature blend door actuator
(19E616). REFER to Section 412-04. TEST the system
for normal operation.
No
REPAIR circuits 437 (YE/LG) for a short to circuit 436
(RD/LG). TEST the system for normal operation.
Page
11
of
47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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