'08 DATC Errors

[Vinny54]

I have multiple (10) error codes on my DATC. I have pulled it and have done the checks on the actuators. All checked out except the drivers blend door, That one has a shorted motor in it. I pulled the connector on it to see if that would restore functionality, but no cigar. Unfortunately, one of the errors is the outside air sensor, which shows -40F. This locks out the AC, and I get heat only. OK for now, but would be handy for defrost.

My question is, do you think the actuator motor short could have blown internal circuitry in the DATC, causing all the error codes? Like I said, I've checked the actuator and outside sensor, and all check good except that one. I have the Alldata online wiring manuals and trouble shooting guide which all point to the DATC being bad, do you agree? Has anyone else experienced this?

 

[Bedrck47]

Welcome to the Forum.

It would be very helpful if you post all the code numbers that you have recorded.

 

[Bedrck47]

Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Chart
NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

DTC Description Action to Take
B1200 Stuck Button Button held too long may set DTC. ATTEMPT to clean buttons. If code returns, INSTALL a new EATC module. REFER to Section 412-01 .
B1251 In-Vehicle Temperature Sensor Open Circuit Go To Pinpoint Test A .
B1253 In-Vehicle Temperature Sensor Circuit Short to Ground Go To Pinpoint Test A .
B1255 Ambient Temperature Sensor Open Circuit Go To Pinpoint Test B .
B1257 Ambient Temperature Sensor Circuit Short to Ground Go To Pinpoint Test B .
B2795 LH A/C Solar Radiation Sensor Circuit Short to Ground Go To Pinpoint Test C .
B2796 LH A/C Solar Radiation Sensor Open Circuit Go To Pinpoint Test C .
B2426 RH A/C Solar Radiation Sensor Open Circuit Go To Pinpoint Test C .
B2427 RH A/C Solar Radiation Sensor Circuit Short to Ground Go To Pinpoint Test C .
B2784 A/C Humidity Sensor Circuit Open Go To Pinpoint Test D .
B2783 A/C Humidity Sensor Circuit Short to Ground Go To Pinpoint Test D .
B2826 Evaporator Temperature Sensor Circuit Failure Go To Pinpoint Test E .
B2827 Evaporator Temperature Sensor Circuit Short to Ground Go To Pinpoint Test E .
B2268 Steering Wheel Control Switch Circuit Open Go To Pinpoint Test F .
B2269 Steering Wheel Control Switch Circuit Short to Ground Go To Pinpoint Test F .
B2266 LH Blend Door Failure or Short Go To Pinpoint Test M .
B2267 RH Blend Door Failure or Short Go To Pinpoint Test M .
B1003 Mode Door Short/Failure Go To Pinpoint Test H .
B2916 Auxiliary Blend Door Failure Go To Pinpoint Test T .
B2917 Auxiliary Mode Door Failure Go To Pinpoint Test U .
B2918 Auxiliary Temperature Input Circuit Open/Short to Ground If the vehicle is not equipped with a center console and rear auxiliary climate controls, ignore the DTC and continue diagnostics.
If the vehicle is equipped with a center console and rear auxiliary climate controls, Go To Pinpoint Test V .
B2919 Auxiliary Blower Motor Speed Input Circuit Open/Short to Ground If the vehicle is not equipped with a center console and rear auxiliary climate controls, ignore the DTC and continue diagnostics.
If the vehicle is equipped with a center console and rear auxiliary climate controls, Go To Pinpoint Test V .
B1676 Battery Voltage Out of Range Go To Pinpoint Test W .
B1342 EATC Module Faulted INSTALL a new EATC module. REFER to Section 412-01 .
U2050 No Application Present INSTALL a new EATC module. REFER to Section 412-01 .


Symptom Chart

SYMPTOM CHART
NOTE: Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Condition Possible Sources Action

• No communication with the electronic automatic temperature control (EATC) or electronic manual temperature control (EMTC) module

• Fuse(s)
• Circuitry open
• EATC or EMTC module communication network

• REFER to Section 418-00 .

• The air inlet door is inoperative

• Circuitry open/shorted
• Door actuator
• Air inlet door binding or stuck
• EMTC module or EATC module

• Go To Pinpoint Test G .

• Incorrect/erratic direction of airflow from outlets

• Circuitry open/shorted
• Door actuator
• Mode door binding or stuck
• EMTC module or EATC module

• Go To Pinpoint Test H .

• The EATC system is inoperative, intermittent or incorrect operation

• Fuse(s)
• Circuitry open

• Go To Pinpoint Test I .

• Insufficient, erratic or no heat

• Low engine coolant level
• Engine overheating
• Plugged or partially plugged heater core
• Temperature blend door is binding or stuck
• Temperature blend door actuator
• Heater hose is kinked or binding

• Go To Pinpoint Test J .

• The air conditioning (A/C) is inoperative/does not operate correctly

• Fuse(s)
• Circuitry open
• A/C system discharged/low charge
• PCM
• EATC module
• EMTC module
• A/C clutch relay
• A/C compressor clutch air gap
• A/C pressure transducer
• Evaporator discharge temperature sensor
• A/C clutch field coil
• Battery junction box (BJB)

• Go To Pinpoint Test K .

• The A/C is always on

• Circuitry shorted
• PCM
• EATC module
• EMTC module
• A/C clutch relay
• A/C compressor clutch air gap
• A/C pressure transducer
• Evaporator discharge temperature sensor
• A/C clutch field coil

• Go To Pinpoint Test L .

• Temperature control is inoperative/does not operate correctly

• Circuitry open/shorted
• EMTC module
• EATC module
• Temperature blend door is binding or stuck
• Temperature blend door actuator

• Go To Pinpoint Test M .

• The blower motor is inoperative — EMTC

• Fuse(s)
• Circuitry open
• A/C blower motor switch
• Blower motor relay
• A/C blower motor
• EMTC module
• BJB

• Go To Pinpoint Test N .

• The blower motor does not operate correctly — EMTC

• Circuitry open/shorted
• A/C blower motor resistor
• A/C blower motor switch

• Go To Pinpoint Test O .

• The blower motor is inoperative — EATC

• Fuse(s)
• Circuitry short/open
• Blower motor relay
• A/C blower motor
• EATC module
• A/C blower motor speed control
• BJB

• Go To Pinpoint Test P .

• The blower motor does not operate correctly — EATC

• Circuitry open/shorted
• A/C blower motor speed control
• EATC module

• Go To Pinpoint Test Q .

• The auxiliary blower motor is inoperative

• Fuse(s)
• Circuitry open
• Auxiliary blower motor relay 1
• Auxiliary blower motor resistor
• Auxiliary blower motor
• EMTC module
• EATC module

• Go To Pinpoint Test R .

• The auxiliary blower motor does not operate correctly

• Fuse(s)
• Circuitry open/shorted
• Auxiliary blower motor relay 1
• Auxiliary blower motor relay 2
• Auxiliary blower motor relay 3
• Auxiliary blower motor resistor
• Rear auxiliary control
• EMTC module
• EATC module

• If the auxiliary blower motor does not operate correctly from both the front and rear auxiliary controls, Go To Pinpoint Test S .
• If the auxiliary blower motor does not operate correctly from the rear auxiliary controls only, Go To Pinpoint Test V .
• If the auxiliary blower motor does not operate correctly from the front auxiliary controls only, CARRY OUT the Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process. If the condition returns, INSTALL a new EMTC/EATC module. REFER to Section 412-01 . TEST the system for normal operation.

• The auxiliary temperature control is inoperative/does not operate correctly using the front/rear auxiliary climate controls

• Circuitry open/shorted
• Auxiliary blend door actuator
• EMTC module
• EATC module

• If the auxiliary temperature control is inoperative/does not operate correctly from both the front and rear auxiliary controls, Go To Pinpoint Test T .
• If the auxiliary temperature control is inoperative/does not operate correctly from the rear auxiliary controls only, Go To Pinpoint Test V .
• If the auxiliary temperature control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process. If the condition returns, INSTALL a new EMTC/EATC module. REFER To Section 412-01 . TEST the system for normal operation.

• The auxiliary panel/floor control is inoperative/does not operate correctly using the front/rear auxiliary climate controls

• Circuitry open/shorted
• Auxiliary mode door actuator
• EMTC module
• EATC module

• If the auxiliary panel/floor control is inoperative/does not operate correctly from both the front and rear auxiliary controls, Go To Pinpoint Test U .
• If the auxiliary panel/floor control is inoperative/does not operate correctly from the rear auxiliary controls only, Go To Pinpoint Test V .
• If the auxiliary panel/floor control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process. If the condition returns, INSTALL a new EMTC/EATC module. REFER to Section 412-01 . TEST the system for normal operation.

• The auxiliary temperature, panel/floor and blower motor controls are inoperative/do not operate correctly using the front/rear auxiliary climate controls

• Circuitry open/shorted
• Rear auxiliary control
• EMTC module
• EATC module

• Go To Pinpoint Test V .

• The dual temperature control is inoperative/does not operate correctly

• Temperature blend door/actuator broken/binding
• EATC module
• Low A/C refrigerant charge

• CHECK that the A/C system pressure is above 290 kPa (42 psi). If the pressure is below 290 kPa (42 psi), REFER to Fluorescent Dye Leak Detection in this section. CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new EMTC/EATC module.

• The temperature set point does not repeat after turning the ignition switch OFF

• Fuse
• Circuitry short/open
• EATC module

• VERIFY smart junction box (SJB) fuse 15 (10A) is OK. If OK, CHECK circuit SBP15 (WH/RD) for a short or open and repair as necessary. If OK, INSTALL a new EATC module.

• The temperature display will not switch between Celsius and Fahrenheit

• EATC module
• Instrument cluster (IC) module

• If the instrument cluster does not switch between English and Metric, refer to Section 413-00 and diagnose.
• If only the EATC module does not switch between English and Metric, INSTALL a new EATC module.

 

[Mickey Bruzek]

Where is Pinpoint Test W? I am getting a code of B1676.

 

[Bedrck47]

Where is Pinpoint Test W? I am getting a code of B1676.

The test procedure is in the service manual.

The procedure that is posted was from the 2008 manual If you have a different year the let me know.

http://www.expeditionforum.com/threads/factory-service-manuals.25089/

 

[Mickey Bruzek]

I have a 2000. The battery light goes on at highway speed. My mechanic thought it might have something to do with the ABS...

 

[Bedrck47]

That it may But this thread was dealing with an 2008 with EATC (heat and A/C problems)

For your 2000 expy

B1676 Voltage Out of Range ABS Go To Pinpoint Test Q .


PINPOINT TEST Q: B1676 — VOLTAGE OUT OF RANGE
CONDITIONS DETAILS/RESULTS/ACTIONS
Q1 CHECK FOR FAULT REPEATABILITY

Scan Tool

Clean Continuous DTCs

Drive the vehicle at least 16 km/h (10 mph).

Retrieve and document continuous DTCs.

• Is DTC B1676 retrieved?

Yes
GO to Q2 .

No
If no DTCs are retrieved, RETURN vehicle to owner.

If a different DTC is retrieved, GO to ABS Control Module Diagnostic Trouble Code (DTC) Index.
Q2 CHECK IGNITION FEED VOLTAGE

Disconnect the wiring at the ABS module.

Start the engine.

Read the voltage across ABS connector pin 16, circuit 533 (TN/RD) and pin 8, circuit 530 (LG/YE).

• Is the voltage greater than 16.6 volts or less than 9.2 volts?

Yes
CHECK the charging system.

No
INSTALL a new anti-lock brake control module. REFER to Anti-Lock Brake System (ABS) Module in this section. CLEAR DTCs and ROAD TEST.