Mark LT 4WD V8-5.4L VIN 5 (2006)
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CAN data plus circuit 1827 (WH/LG) open
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CAN data minus circuit 1828 (PK/LG) open
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instrument cluster C220a
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instrument cluster
Test G: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond to the
Diagnostic Tool
PINPOINT TEST G: THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL
G1-G3
Normal Operation
The EATC module communicates with the diagnostic tool through the universal asynchronous receiver transmitter (UART)-based protocol (UBP)
communications network circuit 1906 (VT).
Check the UBP circuit between the EATC module C228b and the data link connector (DLC) C251. The total resistance value must not be more than 5
ohms. If the resistance is more than 5 ohms there is an open in circuit 1906 (VT), damage to the DLC C251, damage to the EATC module C228b, or
a problem in the in-line connector.
Possible Causes
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UBP circuit 1906 (VT) open
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EATC module C228b
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EATC module
Test H: The Anti-Lock Brake System (ABS) Module Does Not Respond to the Diagnostic Tool
