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Home >> Ford >> 2005 >> F 150 2WD Pickup V6-4.2L VIN 2 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinpoint Tests >> Test G: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond to the Diagnostic Tool
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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


Test 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 circuit 1906 (VT) 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
- circuit 1906 (VT) open
- in-line connector
- DLC C251
- EATC module C228b
- EATC module
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