Pinpoint Test J: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond To The Diagnostic Tool
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- J1 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 J2.
No
REPAIR the EATC module C228b. CARRY OUT the data link diagnostics test.
- J2 CHECK CIRCUITS 3125 (RD/YE) AND 3126 (TN/YE) FOR AN OPEN
- Measure the resistance between the EATC module C228b-11, circuit 3126 (TN/YE), harness side and the DLC C251-6, circuit 3126 (TN/YE), harness side.
- Measure the resistance between the EATC module C228b-1 circuit 3125 (RD/YE), harness side and the DLC C251-14, circuit 3125 (RD/YE), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to J3.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
- J3 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 CLIMATE CONTROL SYSTEM . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.