Electronic Automatic Temperature Control (EATC) Module Cold Boot Process

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of the cold boot process is to allow the EATC module to reinitialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.

Turn the ignition switch to the OFF position.
Disconnect the EATC module electrical connectors.
Wait one minute.
Connect the EATC module electrical connectors.
Turn the ignition switch to the ON position.
Select any position except OFF on the EATC module.

The EATC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the INTRODUCTION - GASOLINE article.

ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC	EATC (On Demand) Self-Test Faults	EATC (Continuous) Run-Time Faults	Description	Action to Take
B2266	024	025	Blend door failure or short	GO to PINPOINT TEST A .
B1251	031	N/A	A/C in-vehicle temperature sensor open circuit	GO to PINPOINT TEST B .
B1253	030	N/A	A/C in-vehicle temperature sensor short to ground	GO to PINPOINT TEST B .
B1255	041	043	A/C ambient temperature sensor open circuit	GO to PINPOINT TEST C .
B1257	040	042	A/C ambient temperature sensor short to ground	GO to PINPOINT TEST C .
B1259	N/A	N/A	A/C solar radiation sensor circuit open	GO to PINPOINT TEST D .
B1261	050	052	A/C solar radiation sensor circuit short to ground	GO to PINPOINT TEST D .
U1073	N/A	-	SCP invalid or missing data for engine coolant	Refer to the INTRODUCTION - GASOLINE article.
U1341	N/A	N/A	SCP invalid data for vehicle speed	Refer to the INTRODUCTION - GASOLINE article.