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EATC code 43 on my 2000 Merc Mountaineer

Just checked my EATC and is showing code 43.What is a code 43?

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6ya6ya
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Posted on Jan 02, 2017

jgwhomeequip
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SOURCE: 2002 merc mountaineer awd wont come out of awd

If the vehicle is made to be a AWD you cannot get it out of AWD unless you take off the front drive shaft

Posted on Feb 10, 2009

  • 204 Answers

SOURCE: 2003 Merc Mountaineer. Won't start. I get the

Could be a defective fuel cap, or you just need to take the cap off and put it back on.

Posted on Feb 04, 2010

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SOURCE: 2003 merc mountaineer error code p0171 what dose

System too lean bank 1. Either vacuum leak or bad O2 sensor bank 1.

Posted on Jun 30, 2010

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When heat is on it blow hot ondrivers side and cold on ppassenger side.


Do you hear any clicking sounds coming from behind the instrument panel ? Electrically controlled actuators move temp . blend doors and they wear out .Plastic gears etc..
Electronic Automatic Temperature Control System
The electronic automatic temperature control (EATC) system operation is determined by the settings on the EATC module. The EATC system automatically maintains a selected temperature for vehicle interior comfort, including capabilities to maintain separate temperature settings for the driver and front passenger. The electronic temperature control capabilities are achieved by splitting the air distribution system internally and utilizing 2 individually operated temperature blend doors. The EATC system is composed of the EATC module, automatic temperature control (ATC) solenoid and manifold, blower motor speed control, 4 vacuum control motors, 2 temperature blend door actuators, in-car temperature sensor, ambient air temperature sensor and solar amplifier (sunload sensor) to control the various functions. Do you know about DTC'S - diagnostic trouble codes ?

The electronic automatic temperature control (EATC) system must be diagnosed by first retrieving any DTCs, if present.
  • An on-demand (hard fault) DTC indicates that the fault is currently present. An on-demand DTC suggests a wiring fault, disconnected connector or component failure.
  • A continuous (intermittent) DTC alone (corresponding on-demand DTC is not present) indicates that the fault is an intermittent condition and may not be currently present. A continuous only DTC suggests a poor wiring connection, loose pin or terminal or intermittent component failure.
On-demand (hard fault) or continuous (intermittent fault) DTCs can be retrieved using a diagnostic tool. If using a diagnostic tool, refer to the diagnostic tool operating manual.
On-demand DTCs can also be retrieved by carrying out the Electronic Automatic Temperature Control Module On-Demand Self Test. To retrieve and/or clear continuous DTCs carry out the Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs procedure. Always carry out the Electronic Automatic Temperature Control Module On-Demand Self Test before retrieving continuous DTCs.
If no DTCs are present, GO to Symptom Chart for the appropriate diagnostic action.

DTC EATC DTC Displayed Notes Description Action to Take B2266 2266 N/A LH Blend Door Failure or Short Go To Pinpoint Test A . B2267 2267 EATC Only RH Blend Door Failure or Short Go To Pinpoint Test A .
  • The dual temperature control is inoperative/does not operate correctly - Dual Zone EATC
  • Temperature blend door/actuator broken/binding
  • EATC module
  • CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new EATC module. REFER to Section 412-01 . TEST the system for normal

Feb 05, 2017 | 2006 Mercury Mountaineer

2 Answers

Where is the fuel filter on a 97 merc mountianeer


Should be under the truck in the fuel line.

Nov 24, 2015 | Cars & Trucks

1 Answer

Sounds ike my 1999 merc mountaineer wants to start, but then clicking noise. someone says can knock it in place with screwdriver and hammer...is this true?


A mechanic would check for voltage at the battery, then the cables, then voltage at the starter. The starter gets voltage from the battery and from the key switch to energize the solenoid.
Fords need at least 10.5 volts and 200 amps to crank the starter. A battery can have a dead cell and show 12 volts but no cranking amps.

Jul 21, 2012 | 1999 Mercury Mountaineer

1 Answer

2003 merc mountaineer error code p0171 what dose that mean


System too lean bank 1. Either vacuum leak or bad O2 sensor bank 1.

Jun 30, 2010 | 2003 Mercury Mountaineer

1 Answer

Ford Merc PO455 Gross evap leak, could it be gas


gas cap, clean the maf sensor, check for vacuum leaks. i would start with those.

Apr 24, 2010 | 2003 Mercury Mountaineer

1 Answer

No air coming out air vents whats my problem i hae a 99 merc ls


If you have the electronic automatic climate control, it's likely that the rubber O-rings inside the vacuum solenoids in the EATC unit are leaking. Usually you'll get cold air only out the defrost vents or floor with this problem.

If you are mechanically oriented, you can fix it yourself. I repaired the EATC unit in my 2004 Mercury Marauder in about three hours.

Complete instructions, including photographs and the part numbers for new O-rings and the dielectric grease for reassembly can be found in the user forums at www.mercurymarauder.net.

This is a manufacturing issue with the EATC head unit, so if you get a new one, get a written warranty. A new EATC unit is around $600.00. The parts to do the work yourself are about $12.00.

Hope this helps!

D.M.

Feb 21, 2010 | 1999 Mercury Grand Marquis

1 Answer

2001 Merc Marq automatic ac blower motor stopped working. I wired blower directly to battery with a fused switch. This has worked for past 9 months----but, now the compressor stays on when the switch is...


check the fuses and blower motor resister first. Some systems don't have resisters. Use blower motor speed control instead.


SECTION 412-04: Control Components 2001 Crown Victoria/Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION Blower Motor Speed Control Removal and Installation
  1. Disconnect the wire harness connector.
  1. Remove the screws and remove the blower motor speed control.
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  1. To install, reverse the removal procedure.





  • The blower motor is inoperative—EATC
  • Fuse.
  • Circuitry open or shorted.
  • A/C blower motor switch.
  • A/C blower motor resistor.
  • A/C blower motor.
  • Go To Pinpoint Test


----------------------------------------------------------------------------------------------
Electronic Automatic Temperature Control Module Self-Test
  • The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns.
  • The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTCs) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4° and 32°C (40° and 90°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.
  • The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
  • To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
  • If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
  • If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.
  • To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
  • To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
  • Always exit the self-test before powering the system down (system turned OFF).
  • Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.

Apr 16, 2009 | 2001 Mercury Grand Marquis

1 Answer

'03 Merc Mountaineer humming noise when turning


If same tires as before & air pressure set correctly, or as usual, a humming when swerving, or turning one way or the other or both, it's usually a pretty good indicator.

Mar 06, 2009 | 2003 Mercury Mountaineer

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