Pinpoint Test G: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond To The Diagnostic Tool
WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- G1 CHECK THE EATC MODULE C228B FOR DAMAGE
- Key in OFF position.
- Disconnect: EATC Module C228b.
- Inspect the EATC module C228b for damage.
- Is the EATC module C228b OK?
- Yes : GO to G2.
- No : REPAIR the EATC module C228b as necessary. CARRY OUT the data link diagnostics test.
- G2 CHECK CIRCUIT 1906 (VT) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE EATC MODULE C228B FOR AN OPEN
- Measure the resistance between the EATC module C228b-12, circuit 1906 (VT), harness side and the DLC C251-3, circuit 1906 (VT), harness side.
- Is the resistance less than 5 ohms?
- Yes : GO to G3.
- No : REPAIR the circuit. CARRY OUT the data link diagnostics test.
- G3 CHECK FOR CORRECT EATC MODULE OPERATION
- Disconnect all the EATC module connectors.
- Check for:
- Corrosion
- Push-out pins
- Connect all the EATC module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new EATC module. REFER to CONTROL COMPONENTS . CARRY OUT the data link diagnostics test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the data link diagnostics test.