F 350 2WD Super Duty V8-5.4L VIN 5 (2006)
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ABS module C135
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ABS module
Test C: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond to the
Diagnostic Tool
PINPOINT TEST C: THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DOES NOT RESPOND TO THE
DIAGNOSTIC TOOL
C1-C2
C3
Normal Operation
The EATC module communicates with the diagnostic tool through the universal asynchronous receiver-transmitter (UART) based protocol (UBP)
communications network, circuit 693 (OG). Check circuit 693 (OG) between the EATC module C228b and the data link connector (DLC) C251. The
total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in the UBP network circuit, damage to the
DLC C251, damage to the EATC module C228b, or a problem in an in-line connector.
Possible Causes
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UBP communications network, circuit 693 (OG) open