Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 274 (HVAC CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS)DIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX
2010 Mercury Mariner Hybrid, AWD
Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
2010 Mercury Mariner Hybrid, AWDSECTION Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
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 MODULE DIAGNOSTIC TROUBLE CODE INDEX
| DTC | EATC (Hard) Self-Test Faults | EATC (Intermittent) Run-Time Faults | Description | Action to Take |
|---|---|---|---|---|
| B1249 | 024 | 025 | Blend door short or failure | GO to PINPOINT TEST A . |
| B1251 | 031 | N/A | In-vehicle temperature sensor open circuit | GO to PINPOINT TEST B . |
| B1253 | 030 | N/A | In-vehicle temperature sensor short to ground | GO to PINPOINT TEST B . |
| B1255 | 041 | 043 | Ambient temperature sensor open circuit | GO to PINPOINT TEST C . |
| B1257 | 040 | 042 | Ambient temperature sensor short to ground | GO to PINPOINT TEST C . |
| B1261 | 050 | 052 | Solar radiation sensor circuit short to ground | GO to PINPOINT TEST D . |
| U1073 | N/A | N/A | SCP invalid or missing data for engine coolant | If DTCs are present in the instrument cluster, diagnose those codes first. CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to
CLIMATE CONTROL
. TEST the system for normal operation. If no DTCs are present in the instrument cluster, CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation. |
| U1341 | N/A | N/A | SCP invalid or missing data for function read vehicle speed | REFER to the INTRODUCTION - GASOLINE article. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.