HVAC Control System - General Information Ford Five Hundred I

GENERAL SPECIFICATIONS CHART

GENERAL SPECIFICATIONS CHART

Climate Control System

The electronic manual temperature control (EMTC) system heats or cools the vehicle depending on the EMTC control panel selection.

1. The EMTC control panel selections determine heating or cooling, air distribution and enables blower motor operation.
2. The temperature control setting determines the air temperature.
3. The blower motor switch varies the blower motor speed.
4. During A/C operation the system also reduces the relative humidity of the air.
5. The driver side and passenger side temperature settings can be individually controlled. (Dual-zone EMTC only.)

The dual-zone electronic automatic temperature control (EATC) system maintains the selected vehicle interior temperature by heating and/or cooling the air.

1. During A/C operation the system also reduces the relative humidity of the air.
2. The driver may override the automatic mode of operation.
3. The temperature control setting determines the air temperature.
4. The blower motor control override buttons vary the blower motor speed.
5. The driver side and passenger side temperature settings can be individually controlled.

Principles of Operation

There are 4 main principles involved with the basic theory of operation

1. Heat transfer
2. Latent heat of vaporization
3. Relative humidity
4. Effects of pressure

Heat Transfer

If 2 substances of different temperature are placed near each other, the heat in the warmer substance will transfer to the colder substance.

Latent Heat of Vaporization

When a liquid boils (converts to gas) it absorbs heat without raising the temperature of the resulting gas. When the gas condenses (converts back to a liquid), it gives off heat without lowering the temperature of the resulting liquid.

Relative Humidity

The amount of moisture (water vapor content) that the air can hold is directly related to the air temperature. The more heat there is in the air, the more moisture the air can hold. The lower the moisture content in the air, the more comfortable you feel. Removing the moisture from the air lowers its relative humidity and improves personal comfort.

Effects of Pressure on Boiling or Condensation

As the pressure is increased on a liquid, the temperature at which the liquid boils (converts to gas) also increases. Conversely, when the pressure on a liquid is reduced, its boiling point is also reduced. When in the gas state, an increase in pressure causes an increase in temperature, while a decrease in pressure will decrease the temperature of the gas.

Compressor Anti-Slugging Strategy

Liquid refrigerant may accumulate in the A/C compressor under certain conditions. To alleviate damage to the A/C compressor, compressor anti-slugging strategy (CASS) is utilized.

CASS is initiated only under specific conditions

1. Ignition is off for more than 8 hours
2. Ambient temperature is above -4°C (25°F)
3. Battery voltage is above 8.5 volts during engine cranking

When these conditions are present, the powertrain control module (PCM) will activate the A/C control relay prior to cranking of the engine. The A/C control relay engages the A/C compressor for approximately 4-15 A/C compressor revolutions or a maximum of 2 seconds (depending upon vehicle application), allowing the liquid refrigerant to be pushed from the A/C compressor. CASS is initiated by the PCM regardless of the EMTC or the EATC system settings.

The Refrigerant Cycle

During stabilized conditions (air conditioning system shutdown), the refrigerant pressures are equal throughout the system. When the A/C compressor is in operation it increases pressure on the refrigerant vapor, raising its temperature. The high-pressure and high-temperature vapor is then released into the top of the A/C condenser core.

The A/C condenser, being close to ambient temperature, causes the refrigerant vapor to condense into a liquid when heat is removed from the refrigerant by ambient air passing over the fins and tubing. The now liquid refrigerant, still at high pressure, exits from the bottom of the A/C condenser and enters the inlet side of the A/C receiver/drier. The receiver/drier is designed to remove moisture from the refrigerant.

The outlet of the receiver/drier is connected to the thermostatic expansion valve (TXV). The TXV provides the orifice which is the restriction in the refrigerant system and separates the high and low pressure sides of the A/C system. As the liquid refrigerant passes across this restriction, its pressure and boiling point are reduced.

The liquid refrigerant is now at its lowest pressure and temperature. As it passes through the A/C evaporator, it absorbs heat from the airflow passing over the plate/fin sections of the A/C evaporator. This addition of heat causes the refrigerant to boil (convert to gas). The now cooler air can no longer support the same humidity level of the warmer air and this excess moisture condenses on the exterior of the evaporator coils and fins and drains outside the vehicle.

The refrigerant cycle is now repeated with the A/C compressor again increasing the pressure and temperature of the refrigerant.

A thermistor which monitors the temperature of the air that has passed through the evaporator core controls A/C clutch cycling. If the temperature of the evaporator core discharge air is low enough to cause the condensed water vapor to freeze, the A/C clutch is disengaged by the vehicle powertrain control module (PCM).

The high-side line pressure is also monitored so that A/C compressor operation will be interrupted if the system pressure becomes too high or is determined to be too low (low charge condition).

The A/C compressor thermal protection switch will interrupt compressor operation if the compressor housing exceeds temperature limits.

The A/C compressor relief valve will open and vent refrigerant to relieve unusually high system pressure.

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Electronic Manual Temperature Control System

The electronic manual temperature control (EMTC) system operation is determined by the settings on the climate control assembly. The EMTC system is composed of the EMTC module, blower motor resistor, mode door actuator, air inlet door actuator and temperature blend door actuator to control the various functions.

The blower motor switch

1. sets the blower motor speed.
2. directs the blower motor path to ground through the blower motor resistor to allow blower motor operation in LO, MED LO and MED HI.
3. directs the blower motor path directly to ground, bypassing the blower motor resistor, to allow blower motor operation in HI.

The A/C request switch

1. can command the A/C compressor ON when the function selector switch is in PANEL, FLOOR/PANEL, FLOOR/DEFROST and FLOOR when the A/C request switch is pressed. Indicator illuminates when A/C request switch is toggled ON.
2. is inoperative in MAX A/C, OFF and DEFROST.
3. indicator illuminates when the function selector switch is in MAX A/C and cannot be toggled.
4. indicator does not illuminate in OFF and cannot be toggled.
5. indicator does not illuminate in DEFROST but can be toggled ON or OFF. The A/C compressor will operate regardless of indicator status if the outside air temperature is above 6°C (43°F).
6. is serviced only with the climate control assembly.

The function selector switch

1. selects airflow direction.
2. is serviced only with the climate control assembly.

The air recirculation button

1. selects either recirculated or outside air source.
2. recirculates air in any mode except DEFROST, if requested.
3. is disabled in MAX A/C or OFF mode where recirculated air only is used.
4. is disabled in DEFROST mode where outside air only is used.
5. is serviced only with the climate control assembly.

The auxiliary climate controls

1. select the auxiliary blower motor speed.
2. select the auxiliary airflow mode/temperature.

The EMTC module also includes

1. a rear window defrost button, refer to «GLASS, FRAMES AND MECHANISMS»(/ford/five-hundred/i-2004-2007/remont/windows/#window-and-glass) .
2. heated/cooled seat controls, refer to «SEATING»(/ford/five-hundred/i-2004-2007/remont/seats/#seat-system) .

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. The EATC system is composed of the EATC module, blower motor speed control, mode door actuator, air inlet door actuator, temperature blend door actuator, in-vehicle temperature sensor and solar radiation sensor to control the various functions.

When the EATC module is set to AUTO

1. the air distribution direction, blower motor speed and A/C compressor operation are automatically controlled based on the temperature(s) selected.

The EATC module manual override settings

1. allow the air distribution direction to be manually selected.
2. allow the blower motor speed to be manually selected.
3. allow RECIRCULATION mode to be manually selected in all modes except DEFROST. The A/C request can be cancelled by pressing the A/C request switch, turning the indicator OFF.
4. allow A/C compressor operation to be manually selected except in DEFROST.

The auxiliary climate controls

1. select the auxiliary blower motor speed.
2. select the auxiliary airflow mode/temperature.

The EATC module also includes

1. a rear window DEFROST button, refer to «GLASS, FRAMES AND MECHANISMS»(/ford/five-hundred/i-2004-2007/remont/windows/#window-and-glass) .
2. heated/cooled seat controls, refer to «SEATING»(/ford/five-hundred/i-2004-2007/remont/seats/#seat-system) .

Auxiliary Climate Control System

An auxiliary climate control system is available as optional equipment. The auxiliary climate control system operation is determined by the settings on the front or rear auxiliary climate control assembly. The auxiliary climate control assemblies include a blower motor switch and temperature control/air distribution mode knob, neither of which can be individually serviced.

Auxiliary blower motor operation is enabled when the EMTC or EATC is in any mode except OFF. The auxiliary system air can be cooled below interior air temperature only when A/C compressor operation has been requested by the settings of the climate control assembly of the base (front) system. The auxiliary system air can be heated at any time.

The front auxiliary climate controls

1. are built into the dual-zone EMTC or EATC module. The blower motor speed can be set to OFF, LO, MED LO, MED HI or HI by pressing the auxiliary blower FAN button either right (higher) or left (lower). The temperature/airflow mode can be adjusted by pressing the rear button either right (warm/floor) or left (cool/panel). If the front (main) driver side temperature is set to full COOL or full HEAT, the auxiliary temperature will be set to the same as the driver and cannot be changed. When the front auxiliary REAR button is depressed, all control of the auxiliary climate control system functions are then transferred to the rear auxiliary climate control assembly and the auxiliary temperature can be fully independently controlled.

The rear auxiliary climate control assembly

1. blower motor switch controls the auxiliary blower motor speed only when the front auxiliary climate control assembly blower motor switch is set to REAR. The blower motor speed can be set to OFF, LO, MED LO, MED HI or HI.
2. temperature/airflow mode control switch is a potentiometer that outputs a variable voltage to the auxiliary temperature blend door actuator and auxiliary mode door actuator to set the position of the auxiliary temperature blend and mode doors only when the front auxiliary climate control assembly blower motor switch is set to REAR. When A/C compressor operation has not been initiated (A/C compressor commanded on) by the EMTC or EATC module (as equipped), the auxiliary climate control system cannot cool the air below that of the interior air temperature.

Max A/C

When MAX A/C is selected

1. the air inlet door actuator closes off outside air and admits only recirculated air.
2. the recirc button is disabled and the indicator is illuminated.
3. the floor/defrost/panel door directs airflow to the instrument panel A/C registers.
4. blended air temperature is available.
5. the A/C request button is illuminated and will be disabled.
6. the A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
7. the blower motor is ON.

PANEL

When PANEL is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the instrument panel A/C registers.
3. blended air temperature is available.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

PANEL/FLOOR

When PANEL/FLOOR is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct and the instrument panel A/C registers. A small amount of airflow from the side window demisters and defrost duct will be present.
3. blended air temperature is available.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

OFF

When OFF is selected

1. the recirc request button is disabled.
2. the air inlet door actuator closes off outside air and admits only recirculated air.
3. the A/C request button is disabled.
4. the blower motor is OFF.

FLOOR

When FLOOR is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct. A small amount of airflow from the defroster duct and side window demisters will be present.
3. blended air temperature is available.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

FLOOR/DEFROST

When the FLOOR/DEFROST is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct, the defroster duct and the side window demisters.
3. blended air temperature is available.
4. the A/C request button will indicate the last status and the indicator can be toggled. To reduce fogging, the A/C compressor will operate automatically, regardless of indicator status, if the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

DEFROST

When DEFROST is selected

1. the air inlet door actuator opens, admitting only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the defroster duct and side window demisters. A small amount of airflow from the floor duct will be present.
3. blended air temperature is available.
4. the A/C request button will indicate the last status and the indicator can be toggled. To reduce fogging, the A/C compressor will operate automatically, regardless of indicator status, if the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

AUTO

When AUTO is selected

1. the temperature control setting is manually set to the desired setting.
2. the air inlet door actuator is automatically controlled by the EATC module, based on the temperature setting.
3. the mode door actuators are automatically controlled by the EATC module based on the temperature setting.
4. the A/C compressor is automatically controlled by the EATC module based on the temperature setting. The A/C compressor will not operate if the outside temperature is below approximately 6°C (43°F).
5. the A/C request button or the RECIRC request button, if pressed, will transfer the system to semi-auto operation.
6. the blower motor is ON. The blower motor speed is automatically controlled by the EATC module based on the temperature setting, but can be manually overridden.

When OFF is selected

1. the RECIRC request button is disabled.
2. the air inlet door actuator closes off outside air and admits only recirculated air.
3. the floor/defrost/panel door actuator is in the DEFROST position.
4. the A/C request button is disabled.
5. the blower motor is OFF.

When PANEL is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the instrument panel A/C registers.
3. blended air temperature is available. Only when A/C compressor operation has been selected by pressing the A/C request button (indicator ON), can the airflow temperature be cooled below the outside air temperature.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

When PANEL/FLOOR is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct and the instrument panel A/C registers. A small amount of airflow from the side window demisters and defrost duct will be present.
3. blended air temperature is available. Only when A/C compressor operation has been selected by pressing the A/C request button (indicator ON), can the airflow temperature be cooled below the outside air temperature.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

When FLOOR is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct. A small amount of airflow from the defroster duct and side window demisters will be present.
3. blended air temperature is available. Only when A/C compressor operation has been selected by pressing the A/C request button (indicator ON), can the airflow temperature be cooled below the outside air temperature.
4. the A/C request button is enabled. The A/C compressor will operate and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

When the FLOOR/DEFROST is selected

1. the recirc request button is enabled. If the recirc request button is selected (indicator ON), the air inlet door actuator closes off outside air from entering the passenger compartment. If the recirc request button is not selected (indicator OFF), the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the floor duct, the defroster duct and the side window demisters.
3. blended air temperature is available.
4. the A/C request button is enabled. The A/C compressor will operate automatically and the indicator will illuminate if the A/C request button is selected and the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

When DEFROST is selected

1. the recirc request button and indicator is disabled. Regardless of button and indicator status, the air inlet door actuator admits only outside air into the passenger compartment.
2. the floor/defrost/panel door directs airflow to the defroster duct and side window demisters. A small amount of airflow from the floor duct will be present.
3. blended air temperature is available.
4. the A/C request button will indicate the last status and the indicator can be toggled. To reduce fogging, the A/C compressor will operate automatically, regardless of indicator status, if the outside temperature is above approximately 6°C (43°F).
5. the blower motor is ON.

Refer to SYSTEM WIRING DIAGRAMS (Montego), SYSTEM WIRING DIAGRAMS (Five Hundred), or SYSTEM WIRING DIAGRAMS (Freestyle) for schematic and connector information.

Special Tool(s)

SPECIAL TOOL(S) CHART Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool Fluke 77 III Automotive Meter 105-R0056 or equivalent R-134a Manifold Gauge Set 176-R032A or equivalent A/C Pressure Test Adapter 412-093 (T94P-19623-E) Set, A/C Fittings 412-DS028 (014-00333, D93L-19703B) or equivalent Refrigerant Leak Detector 216-00001 or equivalent Pressure Test Kit 014-R1072 or equivalent

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Inspection and Verification

1. Verify the customer's concern by operating the climate control system to duplicate the condition.
2. Inspect to determine if one of the following mechanical or electrical concerns apply: VISUAL INSPECTION CHART Mechanical Electrical Loose, missing or damaged A/C compressor drive belt Loose or disconnected A/C clutch Broken or binding door/actuator Broken or leaking refrigerant lines Obstructed in-vehicle temperature sensor Disconnected in-vehicle temperature aspirator hose Open fuses Blower motor inoperative A/C compressor inoperative Circuitry open/shorted Disconnected electrical connectors Cooling fan inoperative
3. As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting or incorrectly installed component, module and in-line electrical connectors and pins.
4. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
5. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the vehicle selection cannot be entered: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position. check that the battery voltage is greater than 9V. If the diagnostic tool still does not allow the vehicle selection to be entered, refer to the diagnostic tool manual.
6. CARRY OUT the Data Link Diagnostic Test using the diagnostic tool. If the scan tool responds with: SCP+, SCP-, CAN or UBP circuits fault = ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Module Communication Network Diagnostics to diagnose the network concern. If the powertrain control module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and execute the self-test diagnostics for the PCM. If the EATC module is not listed for a communication concern, execute the self-test diagnostics for the EATC module.
7. If any PCM or EATC DTCs are retrieved, and are related to the concern, go to the «POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-eatc-module) or the «DUAL AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-eatc-module) to continue the diagnostics.
8. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__symptom-chart) to continue the diagnostics.
9. If the EATC module cannot be accessed by the scan tool, GO to «PINPOINT TEST E»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .

Electronic Automatic Temperature Control Module - Diagnostic Methods

The electronic automatic temperature control system must be diagnosed by first retrieving any DTCs, if present.

1. 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.
2. 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 . 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.

Electronic Automatic Temperature Control Module On-Demand Self Test

The EATC Module On-Demand Self Test will retrieve on-demand (hard fault) DTCs only, it will not retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the EATC Module On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.

1. The EATC Module On-Demand 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.
2. The EATC Module On-Demand Self Test will detect concerns in the system control functions and will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The vehicle interior temperature should be between 4°C-38°C (40°F-100°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false DTCs may be displayed.
3. The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when the self-test is activated.
4. To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press the AUTO button within 2 seconds. The display will show a flashing blower icon for 20 seconds, after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs present. If DTCs are present, the EATC module will display "00 00" and then on-demand DTCs. Record all DTCs displayed.
5. If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the «Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-eatc-module) and follow the ACTION for each DTC given.
6. If a condition exists, but no DTCs appear during the self-test, GO to «SYMPTOM CHART»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__symptom-chart) Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation.
7. To exit the self-test and retain all DTCs, press any button except DEFROST. The EATC module will exit the self-test and retain all DTCs.
8. To exit the self-test and clear all DTCs, press the DEFROST button. The EATC module will exit the self-test and all DTCs will be cleared.
9. Always exit the self-test before powering the system down (system turned OFF). Once the self-test is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
10. Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

Electronic Automatic Temperature Control Module - Retrieve Continuous DTCs

The EATC module will retrieve only continuous (intermittent) DTCs when carrying out this procedure.

1. Retrieval of continuous DTCs can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when retrieving continuous DTCs.
2. To retrieve continuous DTCs, press the OFF and DEFROST buttons simultaneously and release, then press the RECIRC button within 2 seconds. All vacuum fluorescent segments will be displayed if there are no continuous DTCs present. Continuous DTCs are indicated by the presence of the c Celsius symbol (°C) on the EATC module display. Record all DTCs displayed.
3. If any DTCs appear, carry out the diagnostic procedure. Refer to the «Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-eatc-module) and follow the ACTION for each DTC given.
4. If a condition exists but no DTCs appear, GO to «SYMPTOM CHART»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__symptom-chart) Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation.
5. To exit and retain all continuous DTCs, press any button except DEFROST. The EATC module will exit the retrieved continuous DTCs mode and retain all continuous DTCs.
6. To exit and clear all continuous DTCs, press the DEFROST button. The EATC module will exit the retrieve continuous DTCs mode and all continuous DTCs will be cleared.
7. Always exit the procedure before powering the system down (system turned OFF). Once the procedure is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
8. Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.

Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index

Note. All DTCs can be retrieved as an on-demand (hard fault) or continuous (intermittent fault) fault. If a continuous (intermittent) fault, the degrees Celsius symbol (°C) will be displayed in addition to the DTCs.

DIAGNOSTIC TROUBLE CODE INDEX

Symptom Chart

SYMPTOM CHART

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Normal Operation

Under normal operation, the in-vehicle air temperature sensor receives a ground from the electronic automatic temperature control (EATC) module through circuit 3051 (BK/YE). A 5-volt reference voltage is supplied to the in-vehicle air temperature sensor from the EATC module through circuit 3050 (WH/OG).

Possible Causes

1. An open in circuit 3051 (BK/YE) or 3050 (WH/OG)
2. A short to voltage in circuit 3051 (BK/YE)
3. A short to ground in circuit 3050 (WH/OG)
4. In-vehicle air temperature sensor
5. EATC module

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1. A1 CHECK THE SENSOR RESISTANCE Key in OFF position. Disconnect: In-Vehicle Temperature Sensor C233. Measure the resistance between the in-vehicle temperature sensor terminals. Is the resistance within the specified values for these temperature ranges: 10--20°C (50--68°F), 37,000--58,000 ohms; 20--30°C (68--86°F), 24,000--37,000 ohms; 30--40°C (86--104°F), 16,000--24,000 Ohms? Yes : GO to A2. No : INSTALL a new in-car temperature sensor. TEST the system for normal operation.
2. A2 CHECK THE EATC SENSOR OUTPUT VOLTAGE Key in ON position. Press the AUTOMATIC button. Measure the voltage between the in-vehicle temperature sensor C233-1, circuit 3050 (WH/OG) and C233-2, circuit 3051 (BK/YE). Is the voltage between 4.7 and 5.1 volts? Yes : INSTALL a new in-vehicle sensor. If code returns, INSTALL a new EATC module. TEST the system for normal operation. No : If diagnosing DTC B1251, GO to A3. If diagnosing DTC B1253, GO to A5 .
3. A3 CHECK CIRCUIT 3050 (WH/OG) FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between the EATC module C228b-4, circuit 3050 (WH/OG) and the in-vehicle temperature sensor C233-1, circuit 3050 (WH/OG). Is the resistance less than 5 ohms? Yes : GO to A4. No : REPAIR circuit 3050 (WH/OG) for an open. TEST the system for normal operation.
4. A4 CHECK CIRCUIT 3051 (BK/YE) FOR AN OPEN Measure the resistance between the EATC module C228b-3, circuit 3051 (BK/YE) and the in-vehicle temperature sensor C233-2, circuit 3051 (BK/YE). Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 3051 (BK/YE) for an open. TEST the system for normal operation.
5. A5 CHECK CIRCUIT 3050 (WH/OG) FOR A SHORT TO CIRCUIT 3051 (BK/YE) Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between the in-vehicle temperature sensor C233-1, circuit 3050 (WH/OG) and J233-2, circuit 3051 (BK/YE). Is the resistance greater than 10,000 ohms? Yes : GO to A6. No : REPAIR circuit 3050 (WH/OG) for a short to circuit 3051 (BK/YE). TEST the system for normal operation.
6. A6 CHECK CIRCUIT 3050 (WH/OG) FOR A SHORT TO GROUND Measure the resistance between the EATC module C228b-4, circuit 3050 (WH/OG) and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 3050 (WH/OG) for a short to ground. TEST the system for normal operation.

Under normal operation, the ambient air temperature sensor receives a ground from the EATC module through circuit 3051 (BK/YE). A 5-volt reference voltage is supplied to the ambient air temperature sensor from the EATC module through circuit 3060 (GY/RD).

1. An open in circuit 3051 (BK/YE) or 3060 (GY/RD)
2. A short to voltage in circuit 3051 (BK/YE)
3. A short to ground in circuit 3060 (GY/RD)
4. Ambient air temperature sensor
5. EATC module

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1. B1 CHECK THE SENSOR RESISTANCE Key in OFF position. Disconnect: Ambient Temperature Sensor C132. Measure the resistance between the ambient temperature sensor terminals. Is the resistance within the specified values for these temperature ranges: 10--20°C (50--68°F), 37,000--58,000 ohms; 20--30°C (68--86°F), 24,000--37,000 ohms; 30--40°C (86--104°F), 16,000--24,000 Ohms? Yes : GO to B2. No : INSTALL a new in-car temperature sensor. TEST the system for normal operation.
2. B2 CHECK THE EATC SENSOR OUTPUT VOLTAGE Key in ON position. Press the AUTOMATIC button. Measure the voltage between the ambient temperature sensor C132-1, circuit 3060 (GY/RD) and C132-2, circuit 3051 (BK/YE). Is the voltage between 4.7 and 5.1 volts? Yes : INSTALL a new ambient sensor. If code returns, INSTALL a new EATC module. TEST the system for normal operation. No : If diagnosing DTC B1255, GO to B3. If diagnosing DTC B1257, GO to B5 .
3. B3 CHECK CIRCUIT 3060 (GY/RD) FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between the EATC module C228b-17, circuit 3060 (GY/RD) and the ambient temperature sensor C132-1, circuit 3060 (GY/RD). Is the resistance less than 5 ohms? Yes : GO to B4. No : REPAIR circuit 3060 (GY/RD) for an open. TEST the system for normal operation.
4. B4 CHECK CIRCUIT 3051 (BK/YE) FOR AN OPEN Measure the resistance between the EATC module C228b-3, circuit 3051 (BK/YE) and the ambient temperature sensor C132-2, circuit 3051 (BK/YE). Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 3051 (BK/YE) for an open. TEST the system for normal operation.
5. B5 CHECK CIRCUIT 3060 (GY/RD) FOR A SHORT TO CIRCUIT 3051 (BK/YE) Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between the ambient temperature sensor C132-1, circuit 3060 (GY/RD) and C132-2, circuit 3051 (BK/YE). Is the resistance greater than 10,000 ohms? Yes : GO to B6. No : REPAIR circuit 3060 (GY/RD) for a short to circuit 3051 (BK/YE). TEST the system for normal operation.
6. B6 CHECK CIRCUIT 3060 (GY/RD) FOR A SHORT TO GROUND Measure the resistance between the EATC module C228b-17, circuit 3060 (GY/RD) and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 3060 (GY/RD) for a short to ground. TEST the system for normal operation.

Under normal operation, the solar radiation sensor receives a ground through circuit 3051 (BK/YE). A 5-volt reference voltage is supplied to the solar radiation sensor from the EATC module through circuit 468 (BN).

1. An open in circuit 3051 (BK/YE) or 468 (BN)
2. A short to ground in circuit 468 (BN)
3. Solar radiation sensor
4. EATC module

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Scheme 51

1. C1 CHECK THE SOLAR RADIATION SENSOR RESISTANCE Key in OFF position. Disconnect: Solar Radiation Sensor C286. Measure the resistance between the solar radiation sensor terminals 3 and 4, component side. Is continuity present and the resistance greater than 0 ohms? Yes : GO to C2. No : INSTALL a new solar radiation sensor. TEST the system for normal operation.
2. C2 CHECK THE SOLAR RADIATION SENSOR REFERENCE VOLTAGE Key in ON position. Press the AUTOMATIC button. Measure the voltage between the solar radiation sensor C286-3, circuit 468 (BN) and C286-4, circuit 1205 (BK). Are the voltages between 4.7 and 5.1 volts? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : If diagnosing DTC B2796, GO to C3. If diagnosing DTC B2795, GO to C5 .
3. C3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Key in OFF position. Measure the resistance between the solar radiation sensor C286-4, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : GO to C4. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
4. C4 CHECK CIRCUIT 468 (BN) FOR AN OPEN Disconnect: EATC Module C228b. Measure the resistance between the EATC module C228b-18, circuit 468 (BN) and the solar radiation sensor C286-3, circuit 468 (BN). Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 468 (BN) for an open. TEST the system for normal operation.
5. C5 CHECK CIRCUIT 468 (BN) FOR A SHORT TO GROUND Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between the solar radiation sensor C286-3, circuit 468 (BN) and ground. Are the resistances greater than 10,000 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 468 (BN) for a short to ground. TEST the system for normal operation.

Under normal operation, to rotate the air inlet door actuator clockwise, the EMTC module or EATC module supplies voltage to the air inlet air inlet door actuator motor through the circuit 1990 (WH/LB), and supplies ground through circuit 1991 (LB/WH). To rotate the air inlet door actuator counterclockwise, the EATC module reverses the voltage and ground circuits.

Note. EATC only.

The air inlet door actuator feedback resistor is supplied a ground from the EATC module through circuit 438 (RD/WH) and a 5-volt reference voltage on circuit 436 (RD/LG). The EATC module reads the voltage on the air inlet door actuator feedback circuit 3053 (BN/WH) to determine the air inlet door actuator position by the position of the actuator feedback resistor wiper arm.

1. An open, short to voltage, ground or together in circuits 1991 (LB/WH), 1990 (WH/LB), 438 (RD/WH), 436 (RD/LG) and 3053 (BN/WH)
2. Air inlet door actuator motor
3. EATC module
4. EMTC module
5. Stuck or bound linkage or door

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1. D1 CHECK FOR EATC EQUIPPED Observe the climate controls. Is the vehicle equipped with EATC? Yes : GO to D2. No : GO to D13 .
2. D2 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Key in OFF position. Disconnect: EATC Module C228a. Disconnect: EATC Module C228b. Disconnect: RH Temperature Blend Door Actuator C2092. Disconnect: LH Temperature Blend Door Actuator C2091. Disconnect: Mode Door Actuator C2278. Measure the resistance between EATC module C228a-5, circuit 436 (RD/LG) and EATC module C228a-15, circuit 438 (RD/WH). Is the resistance between 8,400 and 12,600? Yes : GO to D3. No : If the resistance is greater than 12,600 ohms, GO to D5 . If the resistance is less than 8,400 ohms, GO to D7 .
3. D3 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure the resistance between EATC module C228a-15, circuit 438 (RD/WH) and EATC module C228b-1, circuit 3053 (BN/WH). Is the resistance between 250 and 10,250 ohms? Yes : GO to D4. No : If the resistance is greater than 10,250 ohms, GO to D8 . If the resistance is less than 250 ohms, GO to D9 .
4. D4 CHECK POTENTIOMETER HIGH SIDE RESISTANCE Measure the resistance between EATC module C228a-5, circuit 436 (RD/LG) and EATC module C228b-1, circuit 3053 (BN/WH). Is the resistance between 250 and 10,250 ohms? Yes : GO to D11 . No : If the resistance is greater than 10,250 ohms, INSTALL a new door actuator. TEST the system for normal operation. If the resistance is less than 250 ohms, GO to D10 .
5. D5 CHECK CIRCUIT 436 (RD/LG) FOR AN OPEN Disconnect: Air Inlet Door Actuator C289. Measure the resistance between EATC module C228a-5, circuit 436 (RD/LG) and air inlet door actuator C289-1, circuit 436 (RD/LG). Is the resistance less than 5 ohms? Yes : GO to D6. No : REPAIR circuit 436 (RD/LG) for an open. TEST the system for normal operation.
6. D6 CHECK THE ACTUATOR RETURN CIRCUIT 438 (RD/WH) FOR AN OPEN Measure the resistance between EATC module C228a-15, circuit 438 (RD/WH) and air inlet door actuator C289-3, circuit 438 (RD/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 438 (RD/WH) for an open. TEST the system for normal operation.
7. D7 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 436 (RD/LG) FOR A SHORT TOGETHER Disconnect: Air Inlet Door Actuator C289. Measure the resistance between EATC module C228a-5, circuit 436 (RD/LG) and EATC module C228a-15, circuit 438 (RD/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 436 (RD/LG) for a short together. TEST the system for normal operation.
8. D8 CHECK CIRCUIT 3053 (BN/WH) FOR AN OPEN Disconnect: Air Inlet Door Actuator C289. Measure the resistance between air inlet door actuator, EATC module C228b-1, circuit 3053 (BN/WH) and air inlet door actuator C289-2, circuit 3053 (BN/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 3053 (BN/WH) for an open. TEST the system for normal operation.
9. D9 CHECK CIRCUIT 438 (RD/WH) FOR A SHORT TO CIRCUIT 3053 (BN/WH) Disconnect: Air Inlet Door Actuator C289. Measure the resistance between EATC module C228a-15, circuit 438 (RD/WH) and EATC module C228b-1, circuit 3053 (BN/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 3053 (BN/WH) for a short together. TEST the system for normal operation.
10. D10 CHECK CIRCUIT 436 (RD/LG) FOR A SHORT TO CIRCUIT 3053 (BN/WH) Disconnect: Air Inlet Door Actuator C289. Measure the resistance between EATC module C228a-5, circuit 436 (RD/LG) and EATC module C228b-1, circuit 3053 (BN/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 436 (RD/LG) and circuit 3053 (BN/WH) for a short together. TEST the system for normal operation.
11. D11 CHECK CIRCUIT 436 (RD/LG) OR 3053 (BN/WH) FOR A SHORT TO GROUND Disconnect: Air Inlet Door Actuator C289. Measure the resistance between ground and the following: EATC module C228a-5, circuit 436 (RD/LG). EATC module C228b-1, circuit 3053 (BN/WH). Is the resistance greater than 10,000 ohms? Yes : GO to D12. No : REPAIR circuit(s) for a short to ground. TEST the system for normal operation.
12. D12 CHECK CIRCUIT 438 (RD/WH) OR 3053 (BN/WH) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: EATC module C228a-15, circuit 438 (RD/WH). EATC module C228b-1, circuit 3053 (BN/WH). Is voltage present? Yes : REPAIR circuit(s) for a short to power. TEST the system for normal operation. No : GO to D13.
13. D13 CHECK DOOR ACTUATOR CLOCKWISE OPERATION Key in OFF position. Connect: Air Inlet Door Actuator C289 (if previously disconnected). Remove the door actuator and disengage the actuator driveshaft from the actuator door. Mark the door actuator driveshaft position. Key in ON position. Connect a fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and EATC module C228a-8 or EMTC module C294a-8, circuit 1991 (LB/WH). Connect a second fused jumper wire between EATC module C228A-1, or EMTC module C294a-1, circuit 1203 (BK/LB) and EATC module C228a-9 or EMTC module C294a-9, circuit 1990 (WH/LB). Does the actuator motor move in the clockwise direction? Yes : GO to D14. No : GO to D15 .
14. D14 CHECK DOOR ACTUATOR COUNTERCLOCKWISE OPERATION Connect a fused jumper wire between EATC module C228a-1 or EMTC module C294a-1, circuit 1203 (BK/LB) and EATC module C228a-8 or EMTC module C294a-8, circuit 1991 (LB/WH). Connect a second fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and EATC module C228a-9 or EMTC module C294a-9, circuit 1990 (WH/LB). Does the actuator motor move in the counterclockwise direction? Yes : INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EATC or EMTC module. TEST the system for normal operation. No : GO to D15.
15. D15 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: Air Inlet Door Actuator C289. Measure the resistance between EATC module C228a-8 or EMTC module C294a-8, circuit 1991 (LB/WH) and air inlet door actuator C289-5, circuit 1991 (LB/WH). Measure the resistance between EATC module C228a-9 or EMTC module C294a-9, circuit 1990 (WH/LB) and air inlet door actuator C289-6, circuit 1990 (WH/LB). Are the resistances less than 5 ohms? Yes : GO to D16. No : REPAIR the circuit(s) for an open. TEST the system for normal operation.
16. D16 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND Measure the resistance between ground and EATC module C228a-8 or EMTC module C294a-8, circuit 1991 (LB/WH). Measure the resistance between ground and EATC module C228a-9 or EMTC module C294a-9, circuit 1990 (WH/LB). Are the resistances greater than 10,000 ohms? Yes : GO to D17. No : REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
17. D17 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and EATC module C228a-8 or EMTC module C294a-8, circuit 1991 (LB/WH). Measure the voltage between ground and EATC module C228a-9 or EMTC module C294a-9, circuit 1990 (WH/LB). Is voltage present? Yes : REPAIR the circuit(s) for a short to power. TEST the system for normal operation. No : GO to D18.
18. D18 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between EATC module C228a-8 or EMTC module C294a-8, circuit 1990 (WH/LB) and EATC module C228a-9 or EMTC module C294a-9, circuit 1991 (LB/WH). Is the resistance greater than 10,000 ohms? Yes : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit(s) for a short together. TEST the system for normal operation.

Under normal operation, to rotate the mode door actuator clockwise, the EMTC module or EATC module supplies voltage to the Floor/Defrost/Panel mode door actuator motor through the circuit 1989 (OG/LB), and supplies ground through circuit 1988 (BN/OG). To rotate the mode door actuator counterclockwise, the EMTC module or EATC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the EMTC module or EATC module through circuit 438 (RD/WH) and a 5-volt reference voltage on circuit 436 (RD/LG). The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuit 1982 (LB/BK) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

1. An open, short to voltage, ground or together in circuits 1988 (BN/OG), 1989 (OG/LB), 438 (RD/WH), 436 (RD/LG) and 1982 (LB/BK)
2. Floor/defrost/panel mode door actuator motor
3. EATC module
4. EMTC module
5. Stuck or bound linkage or door

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1. E1 CHECK THE AIRFLOW Key in ON position. Check the airflow in the PANEL, RECIRC, DEFROST and FLOOR modes. Is the airflow correct in each setting? Yes : The system is operating normally. No : GO to E2. If the RECIRC button does not change the air inlet door position, GO to «PINPOINT TEST D»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. E2 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: EATC Module C228a or EMTC Module C294a. Disconnect: RH Temperature Blend Door Actuator C2092. NOTE: EATC only. Disconnect: LH Temperature Blend Door Actuator C2091. Disconnect: Air Inlet Door Actuator C289. NOTE: For EATC only. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). Is the resistance between 16,800 and 25,200 ohms? Yes : GO to E3. No : If the resistance is greater than 25,200 ohms, GO to E5 . If the resistance is less than 16,800 ohms, GO to E7 .
3. E3 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK). Is the resistance between 500 and 20,500 ohms? Yes : GO to E4. No : If the resistance is greater than 20,500 ohms, GO to E8 . If the resistance is less than 500 ohms, GO to E9 .
4. E4 CHECK POTENTIOMETER HIGH SIDE RESISTANCE Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK). Is the resistance between 500 and 20,500 ohms? Yes : GO to E11 . No : If the resistance is greater than 20,500 ohms, INSTALL a new door actuator. TEST the system for normal operation. If the resistance is less than 500 ohms, GO to E10 .
5. E5 CHECK CIRCUIT 436 (RD/LG) FOR AN OPEN Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and floor/defrost/panel door actuator C2278-3, circuit 436 (RD/LG). Is the resistance less than 5 ohms? Yes : GO to E6. No : REPAIR circuit 436 (RD/LG) for an open. TEST the system for normal operation.
6. E6 CHECK THE ACTUATOR RETURN CIRCUIT 438 (RD/WH) FOR AN OPEN Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and floor/defrost/panel door actuator C2278-2, circuit 438 (RD/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 438 (RD/WH) for an open. TEST the system for normal operation.
7. E7 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 436 (RD/LG) FOR A SHORT TOGETHER Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 436 (RD/LG) for a short together. TEST the system for normal operation.
8. E8 CHECK CIRCUIT 1982 (LB/BK) FOR AN OPEN Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between floor/defrost/panel door actuator, EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK) and floor/defrost/panel door actuator C2278-4, circuit 1982 (LB/BK). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 1982 (LB/BK) for an open. TEST the system for normal operation.
9. E9 CHECK CIRCUIT 438 (RD/WH) FOR A SHORT TO CIRCUIT 1982 (LB/BK) Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 1982 (LB/BK) for a short together. TEST the system for normal operation.
10. E10 CHECK CIRCUIT 436 (RD/LG) FOR A SHORT TO CIRCUIT 1982 (LB/BK) Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 436 (RD/LG) and circuit 1982 (LB/BK) for a short together. TEST the system for normal operation.
11. E11 CHECK CIRCUIT 436 (RD/LG) OR 1982 (LB/BK) FOR A SHORT TO GROUND Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between ground and the following: EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG). EATC module C228a-16 or EMTC module C294a-16, circuit 1982 (LB/BK). Is the resistance greater than 10,000 ohms? Yes : GO to E12. No : REPAIR circuit(s) for a short to ground. TEST the system for normal operation.
12. E12 CHECK CIRCUIT 438 (RD/WH) OR 1982 (LB/BK) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). EATC module C228a-16 or EMTC module 3294a-16, circuit 1982 (LB/BK). Is voltage present? Yes : REPAIR circuit(s) for a short to power. TEST the system for normal operation. No : GO to E13.
13. E13 CHECK DOOR ACTUATOR CLOCKWISE OPERATION Key in OFF position. Connect: Floor/Defrost/Panel Door Actuator C2278. Remove the door actuator and disengage the actuator driveshaft from the actuator door. Mark the door actuator driveshaft position. Key in ON position. Connect a fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG). Connect a second fused jumper wire between EATC module C228a-1 or EMTC module C294a-1, circuit 1203 (BK/LB) and EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB). Does the actuator motor move in the clockwise direction? Yes : GO to E14. No : GO to E15 .
14. E14 CHECK DOOR ACTUATOR COUNTERCLOCKWISE OPERATION Connect a fused jumper wire between EATC module C228a-1 or EMTC module C294a-1, circuit 1203 (BK/LB) and EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG). Connect a second fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB). Does the actuator motor move in the counterclockwise direction? Yes : INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EATC or EMTC module. TEST the system for normal operation. No : GO to E15.
15. E15 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: Floor/Defrost/Panel Door Actuator C2278. Measure the resistance between EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG) and floor/defrost/panel door actuator C2278-6, circuit 1988 (BN/OG). Measure the resistance between EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB) and floor/defrost/panel door actuator C2278-1, circuit 1989 (OG/LB). Are the resistances less than 5 ohms? Yes : GO to E16. No : REPAIR the circuit(s) for an open. TEST the system for normal operation.
16. E16 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND Measure the resistance between ground and EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG). Measure the resistance between ground and EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB). Are the resistances greater than 10,000 ohms? Yes : GO to E17. No : REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
17. E17 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG). Measure the voltage between ground and EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB). Is voltage present? Yes : REPAIR the circuit(s) for a short to power. TEST the system for normal operation. No : GO to E18.
18. E18 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between EATC module C228a-19 or EMTC module C294a-19, circuit 1989 (OG/LB) and EATC module C228a-20 or EMTC module C294a-20, circuit 1988 (BN/OG). Is the resistance greater than 10,000 ohms? Yes : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit(s) for a short together. TEST the system for normal operation.

Under normal operation, the EATC module receives a ground through circuit 1203 (BK/LB). The EATC module is supplied constant battery voltage through circuit 483 (RD) and ignition switched voltage through circuit 1566 (RD/YE).

1. An open in circuit 1203 (BK/LB), 483 (RD) or 1566 (RD/YE)
2. EATC module

Scheme 89

Scheme 90

1. F1 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228a. Measure the resistance between the EATC module C228a-1, circuit 1203 (BK/LB) and ground. Is the resistance less than 5 ohms? Yes : GO to F2. No : REPAIR circuit 1203 (BK/LB). TEST the system for normal operation.
2. F2 CHECK CIRCUITS 483 (RD) AND 1566 (RD/YE) FOR AN OPEN Key in ON position. Measure the voltage between the EATC module C228a-26, circuit 483 (RD), C228a-14, circuit 1566 (RD/YE) and ground. Is the voltage greater than 10 volts? Yes : GO to «MODULE COMMUNICATIONS NETWORK»(/ford/five-hundred/i-2004-2007/remont/communication-devices/#module-communications-network-system) to diagnose the network concern. No : REPAIR circuit 483 (RD) or 1566 (RD/YE) for an open. TEST the system for normal operation.

Under normal operation, the EATC module receives a ground through circuit 1203 (BK/LB). The EATC module is supplied constant battery voltage through circuit 483 (RD) and ignition switched voltage through circuit 1566 (RD/YE).

Note. For a complete explanation of the EATC system functions, REFER to DESCRIPTION AND OPERATION .

1. An open in circuit 1203 (BK/LB), 483 (RD) or 1566 (RD/YE)
2. EATC module

Testing

1. G1 VERIFY AUTOMATIC OPERATION Key in ON position. With the engine running, press the AUTOMATIC button. Does the indicator above the AUTO button illuminate and the selected temperature for both the driver and passenger appear in the display window? Yes : GO to G2. No : GO to G11 .
2. G2 PERFORM THE EATC MODULE SELF-TEST Key in ON position. CARRY OUT the EATC module self-test. Refer to the «ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE SELF-TEST»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-module-on-demand) . Record the DTCs displayed, if any. Were any DTCs displayed as a result of the EATC self-test? Yes : REFER to the «EATC module Diagnostic Trouble Code (DTC) Index»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__electronic-automatic-temperature-control-eatc-module) . CARRY OUT the necessary diagnosis and REPAIR as required. No : GO to G3.
3. G3 CHECK THE VACUUM FLUORESCENT DISPLAY Exit self-test by pressing the DEFROST button. Observe the button indicators and function symbols displayed on the vacuum fluorescent display while changing the temperature, blower speed and functions. Are the display and indicators correct and complete without any missing elements? Yes : GO to G4. No : INSTALL a new EATC module. TEST the system for normal operation.
4. G4 CHECK THE BLOWER MANUAL OVERRIDE OPERATION Press the blower motor speed override control fully up and fully down. Does the blower motor speed increase from low speed to high and high speed to low? Yes : GO to G5. No : If the blower motor is inoperative, GO to «PINPOINT TEST N»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . If the blower motor does not operate correctly, GO to «PINPOINT TEST O»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
5. G5 VERIFY THE DEFROST OVERRIDE OPERATION Press the override button for DEFROST operation. Is outside air being discharged from the windshield defroster nozzle and the side window demisters? Yes : GO to G6. No : GO to «PINPOINT TEST E»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
6. G6 VERIFY THE FLOOR OVERRIDE OPERATION Press the override button for FLOOR operation. Is outside air being discharged from the floor duct? Yes : GO to G7. No : GO to «PINPOINT TEST D»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
7. G7 VERIFY THE PANEL OVERRIDE OPERATION Press the override button for PANEL operation. Is outside air being discharged from the instrument panel registers? Yes : GO to G8. No : GO to «PINPOINT TEST E»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
8. G8 VERIFY THE A/C CLUTCH DOES NOT ENGAGE IN THE PANEL MODE In PANEL operation and the A/C OFF, listen for the compressor clutch to engage. Does the A/C clutch engage with the PANEL override button pressed? Yes : GO to «PINPOINT TEST J»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . No : GO to G9.
9. G9 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE Make sure the ambient air temperature is above 6°C (43°F). Press the override button for A/C operation. Does the A/C clutch engage when the A/C override button is pressed? Yes : GO to G10. No : GO to «PINPOINT TEST I»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
10. G10 VERIFY THE RECIRC OVERRIDE OPERATION Press the PANEL and RECIRC override buttons. Is recirculated air being discharged from the instrument panel registers? Yes : The test is complete. The system is functioning normally. No : GO to «PINPOINT TEST D»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
11. G11 CHECK THE EATC MODULE FUNCTIONS Press each function button and observe the display. Does the EATC perform and display any functions? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : GO to G12.
12. G12 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228a. Measure the resistance between the EATC module C228a-1, circuit 1203 (BK/LB) and ground. Is the resistance less than 5 ohms? Yes : GO to G13. No : REPAIR circuit 1203 (BK/LB). TEST the system for normal operation.
13. G13 CHECK CIRCUITS 483 (RD) AND 1566 (RD/YE) FOR AN OPEN Key in ON position. Measure the voltage between the EATC module C228a-26, circuit 483 (RD), C228a-14, circuit 1566 (RD/YE) and ground. Is the voltage greater than 10 volts? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 483 (RD) or 1003 (GY/YE) for an open. TEST the system for normal operation.

Under normal operation, warm coolant flows from the engine through the heater core and back to the engine.

1. Plugged heater core
2. Coolant level
3. Temperature blend door

Scheme 91

Scheme 92

1. H1 CHECK FOR PROPER ENGINE COOLANT LEVEL Key in OFF position. Check the engine coolant level when hot and cold. Is the engine coolant at the correct level (hot/cold) as indicated on the engine coolant recovery reservoir? Yes : GO to H3 . No : GO to H4 .
2. H2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS Pressure test the cooling system for leaks. Refer to «ENGINE COOLING»(/ford/five-hundred/i-2004-2007/remont/cooling-system-mechanical/#engine-cooling-system) . Does the engine cooling system leak? Yes : REPAIR the engine coolant leak. TEST the system for normal operation. No : GO to H3 .
3. H3 CHECK FOR COOLANT FLOW TO THE HEATER CORE WARNING: The heater core inlet hose will become too hot to handle and may cause serious burns if the system is working correctly. Run the engine until it reaches normal operation temperature. Select the FLOOR position on the control assembly. Set the temperature control to full WARM. Feel the heater core inlet hose to see if it is hot. Is the heater core inlet hose hot? Yes : GO to H4. No : REFER to «ENGINE COOLING»(/ford/five-hundred/i-2004-2007/remont/cooling-system-mechanical/#engine-cooling-system) to check cooling system function.
4. H4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE WARNING: The heater core outlet hose will become too hot to handle and may cause serious burns if the system is operating correctly. Feel the heater core outlet hose to see if it is hot. Is the heater core outlet hose hot? Yes : GO to «PINPOINT TEST K»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) and diagnose for a blend door actuator. No : INSTALL a new heater core. TEST the system for normal operation.

Under normal operation, when A/C is requested, a message is sent over the MSCAN bus to the instrument cluster, then from the instrument cluster through the HSCAN bus to the PCM (EATC systems) or a voltage is sent to the instrument cluster through circuit 1424 (TN/BK) then a message from the instrument cluster through the HSCAN bus to the PCM (EMTC systems).

Ignition voltage for the A/C clutch relay switch is provided through circuit 3028 (DB/YE). When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit 1810 (LG/OG). Ground is supplied for the A/C clutch through circuit 1205 (BK).

1. An open in circuits 1424 (TN/BK), 3028 (DB/YE), 1810 (LG/OG) or 1205 (BK)
2. An short to voltage on circuit 1424 (TN/BK)
3. PCM
4. EATC module
5. EMTC module
6. A/C evaporator discharge temperature sensor
7. A/C pressure transducer
8. A/C compressor clutch field coil
9. A/C control relay
10. A/C clutch air gap

Note. Before carrying out the following test, diagnose any PCM or instrument cluster DTCs.

Note. When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.

Note. Before carrying out the following test, 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 .

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

1. I1 CHECK THE A/C PRESSURE PCM PID Key in ON position. Enter the following diagnostic mode on the scan tool: A/C Pressure PCM PID. With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the A/C pressure PID. Are the pressure values of the manifold gauge set and the A/C pressure PID similar? Yes : GO to I2. No : INSTALL a new A/C pressure transducer. TEST the system for normal operation.
2. I2 CHECK THE A/C EVAPORATOR TEMPERATURE PID Allow the vehicle exterior and interior to stabilize to an ambient temperature above 16°C (60°F). Enter the following diagnostic mode on the scan tool: A/C Evaporator Discharge Temperature PCM PID. Does the A/C evaporator discharge temperature PID read similar to the ambient temperature? Yes : EATC, GO to I3. EMTC, GO to I4 . No : INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
3. I3 CHECK THE A/C SWITCH PID WITH THE A/C ON Enter the following diagnostic mode on the scan tool: PCM A/C SWITCH PID. Press the PANEL and A/C manual override buttons on the EATC module. Does the PCM A/C SWITCH PID read ON? Yes : GO to I5 . No : INSTALL a new EATC module. TEST the system for normal operation.
4. I4 CHECK THE EMTC A/C SIGNAL WITH THE A/C ON Key in OFF position. Disconnect: Instrument Cluster C220. Key in ON position. Select PANEL mode and press the A/C button on the EMTC module. Measure the resistance between instrument cluster C220-10, circuit 1424 (TN/BK) and ground. Is the resistance less than 5 ohms? Yes : GO to I5. No : GO to I7 .
5. I5 CHECK THE A/C REQUEST PID WITH THE A/C ON Key in OFF position. NOTE: EMTC only. Disconnect: Instrument Cluster C220. NOTE: EMTC only. Key in ON position. NOTE: EMTC only. Enter the following diagnostic mode on the scan tool: PCM A/C REQUEST PID. Press the PANEL and A/C manual override buttons on the EATC module or select MAX A/C on the EMTC module. Does the PCM A/C REQUEST PID read ON? Yes : GO to I6. No : INSTALL a new PCM. TEST the system for normal operation.
6. I6 CHECK THE A/C CLUTCH RELAY PID WITH THE A/C ON Enter the following diagnostic mode on the scan tool: PCM A/C CLUTCH RELAY PID. Does the PCM A/C CLUTCH RELAY PID read ON? Yes : GO to I9 . No : INSTALL a new PCM. TEST the system for normal operation.
7. I7 CHECK CIRCUIT 1424 (TN/BK) FOR AN OPEN Key in OFF position. Disconnect: EMTC Module C294a. Measure the resistance between EMTC module C294a-3, circuit 1424 (TN/BK) and IC C220-10, circuit 1424 (TN/BK). Is the resistance less than 5 ohms? Yes : GO to I8. No : REPAIR circuit 1424 (TN/BK) for an open. TEST the system for normal operation.
8. I8 CHECK CIRCUIT 1424 (TN/BK) FOR A SHORT TO VOLTAGE Key in ON position. Measure the voltage between EMTC module C294a-3, circuit 1424 (TN/BK) and ground. Is the voltage greater than 10 volts? Yes : INSTALL a new PCM. TEST the system for normal operation. No : REPAIR circuit 1424 (TN/BK) for a short to voltage. TEST the system for normal operation.
9. I9 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL Key in OFF position. Disconnect: A/C Compressor Clutch Field Coil C100. Key in ON position. Press the PANEL and A/C manual override buttons on the EATC module or select MAX A/C on the EMTC module. Measure the voltage between the A/C compressor clutch field coil C100-1, circuit 1810 (LG/OG) and ground. Is the voltage greater than 10 volts? Yes : GO to I10. No : GO to I12 .
10. I10 CHECK THE GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL Key in OFF position. Measure the resistance between the A/C compressor clutch field coil C100-2, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : GO to I11. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
11. I11 CHECK THE A/C COMPRESSOR CLUTCH AIR GAP Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley. Is the A/C compressor clutch air gap greater than 0.75 (0.030 in)? Yes : ADJUST the A/C compressor clutch gap. REFER to «AIR CONDITIONING (A/C) CLUTCH AIR GAP ADJUSTMENT»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . TEST the system for normal operation. No : INSTALL a new A/C compressor clutch field coil. TEST the system for normal operation.
12. I12 CHECK CIRCUIT 364 (BK/LG) Key in OFF position. Disconnect: A/C Clutch Relay. Key in ON position. Measure the voltage between the A/C clutch relay socket pin 3, circuit 3028 (DB/YE) and ground. Is the voltage greater than 10 volts? Yes : GO to I13. No : REPAIR circuit 364 (BK/LG) for an open. TEST the system for normal operation.
13. I13 CHECK CIRCUIT 1810 (LG/OG) Key in OFF position. Measure the resistance between the A/C clutch relay socket pin 5, circuit 1810 (LG/OG) and the A/C compressor clutch field coil C100-1, circuit 1810 (LG/OG). Is the resistance less than 5 ohms? Yes : INSTALL a new PCM. TEST the system for normal operation. No : REPAIR circuit 1810 (LG/OG) for an open. TEST the system for normal operation.

Under normal operation, when A/C is requested, a message is sent over the MSCAN bus to the instrument cluster, then from the instrument cluster through the HSCAN bus to the PCM (EATC systems) or a voltage is sent to the instrument cluster through circuit 1424 (TN/BK) then a message from the instrument cluster through the HSCAN bus to the PCM (EMTC systems).

Ignition voltage for the A/C clutch relay switch is provided through circuit 3028 (DB/YE). When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit 1810 (LG/OG). Ground is supplied for the A/C clutch through circuit 1205 (BK).

1. An short to ground on circuit 1424 (TN/BK)
2. An short to voltage on circuit 1810 (LG/OG)
3. PCM
4. EATC module
5. EMTC module
6. A/C evaporator discharge temperature sensor
7. A/C pressure transducer
8. A/C control relay
9. A/C clutch air gap

Note. Before carrying out the following test, diagnose any PCM or instrument cluster DTCs.

Note. When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connetor-locking device is in place and that the locking device and connector are correctly and fully seated.

1. J1 CHECK THE A/C PRESSURE PCM PID Key in ON position. Enter the following diagnostic mode on the scan tool: A/C Pressure PCM PID. With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the A/C pressure PID. Are the pressure values of the manifold gauge set and the A/C pressure PID similar? Yes : GO to J2. No : INSTALL a new A/C pressure transducer. TEST the system for normal operation.
2. J2 CHECK THE A/C EVAPORATOR TEMPERATURE PID Allow the vehicle exterior and interior to stabilize to an ambient temperature above 16°C (60°F). Enter the following diagnostic mode on the scan tool: A/C Evaporator Discharge Temperature PCM PID. Does the A/C evaporator discharge temperature PID read similar to the ambient temperature? Yes : GO to J3. No : INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
3. J3 CHECK A/C REQUEST PID WITH THE A/C OFF Enter the following diagnostic mode on the scan tool: PCM A/C REQUEST PID. Does the PCM A/C REQUEST PID read ON? Yes : EATC, GO to J4. EMTC, GO to J5 . No : GO to J7 .
4. J4 CHECK A/C SWITCH PID WITH THE A/C OFF Enter the following diagnostic mode on the scan tool: PCM A/C SWITCH PID. Does the PCM A/C SWITCH PID read ON? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : INSTALL a new PCM. TEST the system for normal operation.
5. J5 CHECK EMTC A/C REQUEST OUTPUT Key in OFF position. Disconnect: IC C220. Key in ON position. Select the OFF position on the EMTC module. Measure the resistance between IC C220-10, circuit 1424 (TN/BK) and ground. Is the resistance less than 5 ohms? Yes : GO to J6. No : INSTALL a new PCM. TEST the system for normal operation.
6. J6 CHECK CIRCUIT 1424 (TN/BK) FOR A SHORT TO GROUND Key in OFF position. Disconnect: EMTC C294a. Key in ON position. Measure the resistance between IC C220-10, circuit 1424 (TN/BK) and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new EMTC module. TEST the system for normal operation. No : REPAIR circuit 1424 (TN/BK) for a short to ground. TEST the system for normal operation.
7. J7 CHECK A/C CLUTCH RELAY PID WITH THE A/C OFF Enter the following diagnostic mode on the scan tool: PCM A/C CLUTCH RELAY PID. Does the PCM A/C CLUTCH RELAY PID read ON? Yes : REFER to «INTRODUCTION - GASOLINE»(/ford/five-hundred/i-2004-2007/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article . No : GO to J8.
8. J8 CHECK FOR VOLTAGE TO THE A/C COMPRESSOR CLUTCH FIELD COIL Key in OFF position. Disconnect: A/C Compressor Clutch Field Coil C100. Key in ON position. Select the OFF position on the EMTC module. Measure the voltage between the A/C compressor clutch field coil C100-1, circuit 1810 (LG/OG) and ground. Is the voltage greater than 10 volts? Yes : GO to J9. No : ADJUST the A/C compressor clutch gap. REFER to «AIR CONDITIONING (A/C) CLUTCH AIR GAP ADJUSTMENT»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . TEST the system for normal operation.
9. J9 CHECK CIRCUIT 1810 (LG/OG) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: A/C Clutch Relay. Key in ON position. Measure the voltage between the A/C compressor clutch field coil C100-1, circuit 1810 (LG/OG) and ground. Is the voltage greater than 10 volts? Yes : REPAIR circuit 1810 (LG/OG) for a short to voltage. TEST the system for normal operation. No : INSTALL a new A/C clutch relay. Check the A/C clutch diode. INSTALL a new diode if necessary. TEST the system for normal operation.

Under normal operation, to rotate the blend door actuator clockwise, the EMTC module or EATC module supplies voltage to the Blend door actuator motors through the door actuator feed A circuits, and supplies ground through the door actuator feed B circuits. To rotate the blend door actuator counterclockwise, the EMTC module or EATC module reverses the voltage and ground circuits.

The blend door actuator feedback resistors are supplied a ground from the EMTC module or EATC module by the blend door actuator return circuits and a 5-volt reference voltage on the blend door actuator reference circuits. The EMTC module or EATC module reads the voltage on the blend door actuator feedback circuits to determine the blend door actuator position by the position of the actuator feedback resistor wiper arm.

Door actuator feed A circuits

1. LH Blend - 246 (VT)
2. RH Blend - 660 (YE/LG)

Door actuator feed B circuits

1. LH Blend - 245 (BN/LG)
2. RH Blend - 1069 (OG/LB)

Door actuator return circuits

1. LH Blend - 438 (RD/WH)
2. RH Blend - 438 (RD/WH)

Door actuator reference circuits

1. LH Blend - 436 (RD/LG)
2. RH Blend - 436 (RD/LG)

Door actuator feedback circuits

1. LH Blend - 437 (YE/LG)
2. RH Blend - 435 (YE/LB)

1. An open, short to voltage, ground or together in door actuator open, close, return, reference or feedback circuits
2. Blend door actuator motor
3. EATC module
4. EMTC module
5. Stuck or bound linkage or door

Note. Before carrying out the following test, 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 .

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

1. K1 CHECK THE AIRFLOW TEMPERATURE Key in ON position. Check the air discharge temperature in full COOL and full WARM. Is the air discharge temperature correct ? Yes : The system is operating normally. No : For electronic automatic temperature control (EATC) systems: DTC B2266 or B2267, GO to K2. For EMTC systems: If the LH temperature control is inoperative/does not operate correctly, follow diagnostics for the LH blend door actuator. GO to K2. If the RH temperature control is inoperative/does not operate correctly, follow diagnostics for the RH blend door actuator. GO to K2.
2. K2 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: EATC Module C228a or EMTC Module C294a. Disconnect: For DTC B2266 or LH Temperature Blend Door Actuator, RH Temperature Blend Door Actuator C2092. Disconnect: For DTC B2267 or RH Temperature Blend Door Actuator, LH Temperature Blend Door Actuator C2091. Disconnect: Mode Door Actuator C2278. Disconnect: Air Inlet Door Actuator C289. NOTE: For EATC only. Measure the resistance between EATC module C288a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). Is the resistance between 8,400 and 12,600 ohms? Yes : GO to K3. No : If the resistance is greater than 12,600 ohms, GO to K5 . If the resistance is less than 8,400 ohms, GO to K7 .
3. K3 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and the following: For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is the resistance between 250 and 10,250 ohms? Yes : GO to K4. No : If the resistance is greater than 10,250 ohms, GO to K8 . If the resistance is less than 250 ohms, GO to K9 .
4. K4 CHECK POTENTIOMETER HIGH SIDE RESISTANCE Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and the following: For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is the resistance between 250 and 10,250 ohms? Yes : GO to K11 . No : If the resistance is greater than 10,250 ohms, INSTALL a new door actuator. TEST the system for normal operation. If the resistance is less than 250 ohms, GO to K10 .
5. K5 CHECK CIRCUIT 436 (RD/LG) FOR AN OPEN Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and the following: For DTC B2266 or LH blend door actuator C2091-3, circuit 436 (RD/LG). For DTC B2267 or RH blend door actuator C2092-3, circuit 436 (RD/LG). Is the resistance less than 5 ohms? Yes : GO to K6. No : REPAIR circuit 436 (RD/LG) for an open. TEST the system for normal operation.
6. K6 CHECK THE ACTUATOR RETURN CIRCUIT 438 (RD/WH) FOR AN OPEN Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and the following: For DTC B2266 or LH blend door actuator 32091-2, circuit 438 (RD/WH). For DTC B2267 or RH blend door actuator C2092-2, circuit 438 (RD/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 438 (RD/WH) for an open. TEST the system for normal operation.
7. K7 CHECK CIRCUIT 438 (RD/WH) AND CIRCUIT 436 (RD/LG) FOR A SHORT TOGETHER Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 436 (RD/LG) for a short together. TEST the system for normal operation.
8. K8 CHECK CIRCUIT 435 (YE/LB) OR CIRCUIT 437 (YE/LG) FOR AN OPEN Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between the following: For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG) and floor door actuator C2091-4, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB) and RH blend door actuator C2092-4, circuit 435 (YE/LB). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 435 (YE/LB) or circuit 437 (YE/LG) for an open. TEST the system for normal operation.
9. K9 CHECK CIRCUIT 438 (RD/WH) FOR A SHORT TO CIRCUIT 435 (YE/LB) OR CIRCUIT 437 (YE/LG) Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH) and the following: For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 438 (RD/WH) and circuit 435 (YE/LB) or circuit 437 (YE/LG) for a short together. TEST the system for normal operation.
10. K10 CHECK CIRCUIT 436 (RD/LG) FOR A SHORT TO CIRCUIT 435 (YE/LB) OR CIRCUIT 437 (YE/LG) Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG) and the following: For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 436 (RD/LG) and circuit 435 (YE/LB) or circuit 437 (YE/LG) for a short together. TEST the system for normal operation.
11. K11 CHECK CIRCUIT 436 (RD/LG), 437 (YE/LG), OR 435 (YE/LB) FOR A SHORT TO GROUND Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH blend Door Actuator C2092. Measure the resistance between ground and the following: EATC module C228a-5 or EMTC module C294a-5, circuit 436 (RD/LG). For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is the resistance greater than 10,000 ohms? Yes : GO to K12. No : REPAIR circuit(s) for a short to ground. TEST the system for normal operation.
12. K12 CHECK CIRCUIT 438 (RD/WH), 437 (YE/LG) OR 435 (YE/LB) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: EATC module C228a-15 or EMTC module C294a-15, circuit 438 (RD/WH). For DTC B2266 or LH blend door actuator, EATC module C228a-18 or EMTC module C294a-18, circuit 437 (YE/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-17 or EMTC module C294a-17, circuit 435 (YE/LB). Is voltage present? Yes : REPAIR circuit(s) for a short to power. TEST the system for normal operation. No : GO to K13.
13. K13 CHECK DOOR ACTUATOR CLOCKWISE OPERATION Remove the door actuator and disengage the actuator driveshaft from the actuator door. Mark the door actuator driveshaft position. Connect a fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and: For DTC B2266 or LH blend door actuator, EATC module C228a-7 or EMTC module C294a-7, circuit 246 (VT). For DTC B2267 or RH blend door actuator, EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG). Connect a second fused jumper wire between EATC module C228a-1 or EMTC module C294a-1, circuit 1203 (BK/LB) and: For DTC B2266 or LH blend door actuator, EATC module C228a-6 or EMTC module C294a-6, circuit 245 (BN/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-24 or EMTC module C294a-24, circuit 1069 (OG/LB). Does the actuator motor move in the clockwise direction? Yes : GO to K14. No : GO to K15 .
14. K14 CHECK DOOR ACTUATOR COUNTERCLOCKWISE OPERATION Connect a fused jumper wire between EATC module C228a-1 or EMTC module C294a-1, circuit 1203 (BK/LB) and : For DTC B2266 or LH blend door actuator, EATC module C228a-7 or EMTC module C294a-1, circuit 246 (VT). For DTC B2267 or RH blend door actuator, EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG). Connect a second fused jumper wire between EATC module C228a-26 or EMTC module C294a-26, circuit 483 (RD) and: For DTC B2266 or LH blend door actuator, EATC module C228a-6 or EMTC module C294a-6, circuit 245 (BN/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-24 or EMTC module C294a-24, circuit 1069 (OG/LB). Does the actuator motor move in the counterclockwise direction? Yes : INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EATC or EMTC module. TEST the system for normal operation. No : GO to K15.
15. K15 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: For DTC B2266, LH Blend Door Actuator C2091. Disconnect: For DTC B2267, RH Blend Door Actuator C2092. Measure the resistance between: For DTC B2266 or LH blend door actuator, EATC module C228a-7 or EMTC module C294a-7, circuit 246 (VT) and LH blend door actuator C2091-6, circuit 246 (VT). For DTC B2267 or RH blend door actuator, EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG) and RH blend door actuator C2092-6, circuit 660 (YE/LG). Measure the resistance between: For DTC B2266 or LH blend door actuator, EATC module C228a-6 or EMTC module C294a-6, circuit 245 (BN/LG) and LH blend door actuator C2091-1, circuit 245 (BN/LG). For DTC B2267 or RH blend door actuator, EATC module C228a-24 or EMTC module 3294a-24, circuit 1069 (OG/LB) and RH blend door actuator C2092-1, circuit 1069 (OG/LB). Are the resistances less than 5 ohms? Yes : GO to K16. No : REPAIR the circuit(s) for an open. TEST the system for normal operation.
16. K16 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND Measure the resistance between ground and: For DTC B2266 or LH blend door actuator, EATC module C228a-7 or EMTC module C294a-7, circuit 246 (VT). For DTC B2267 or RH blend door actuator, EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG). Measure the resistance between ground and: For DTC B2266 or LH blend door actuator, EATC module C228a-6 or EMTC module C294a-6, circuit 245 (BN/LG). For DTC C2267 or RH blend door actuator, EATC module C228a-24 or EMTC module C294a-24, circuit 1069 (OG/LB). Are the resistances greater than 10,000 ohms? Yes : GO to K17. No : REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
17. K17 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and: For DTC B2266 or LH blend door actuator, EATC module C228a-7 or EMTC module C294a-7, circuit 246 (VT). For DTC C2267 or RH blend door actuator, EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG). Measure the voltage between ground and: For DTC B2266 or LH blend door actuator, EATC module C228a-6 or EMTC module C294a-6, circuit 245 (BN/LG). For DTC C2267 or RH blend door actuator, EATC module C228a-24 or EMTC module C294a-24, circuit 1069 (OG/LB). Is voltage present? Yes : REPAIR the circuit(s) for a short to power. TEST the system for normal operation. No : GO to K18.
18. K18 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER Key in OFF position. NOTE: For DTC B2266 or LH blend door actuator. Measure the resistance between EATC module C228a-6 or EMTC module C228a-6, circuit 245 (BN/LG) and EATC module C228a-7 or EMTC module C228a-7, circuit 246 (VT). NOTE: For DTC C2267 or RH blend door actuator. Measure the resistance between EATC module C228a-24 or EMTC module C294a-24, circuit 1069 (OG/LB) and EATC module C228a-25 or EMTC module C294a-25, circuit 660 (YE/LG). Is the resistance greater than 10,000 ohms? Yes : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit(s) for a short together. TEST the system for normal operation.

Under normal operation, the blower motor relay coil receives ignition voltage through circuit 296 (WH/VT). The coil receives ground from the EMTC module through circuit 1322 (BN/WH) if any function selector position but OFF is selected. Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 261 (OG/BK). Ground for the blower motor is provided through circuit 752 (YE/RD) from the blower resister or the blower switch (HI). The blower resister and blower switch is grounded through circuit 1205 (BK).

1. An open in circuit 752 (YE/RD), 1205 (BK), 261 (OG/BK), 364 (BK/LG), 1322 (BN/WH) or 296 (WH/VT)
2. Blower motor
3. Blower motor relay
4. Blower motor switch

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

1. L1 CHECK CIRCUIT 752 (YE/RD) FOR GROUND Disconnect: Blower Motor C2004. Turn the function selector switch to the vent position. Turn the blower motor switch to the HIGH position. Measure the resistance between A/C blower motor connector C2004-2, circuit 752 (YE/RD) and ground. Is the resistance less than 5 ohms? Yes : GO to L4 . No : GO to L2.
2. L2 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN Disconnect: Blower Motor Switch C294b. Measure the resistance between blower motor switch C294b-2, circuit 752 (YE/RD) and blower motor C2004-2, circuit 752 (YE/RD). Is the resistance less than 5 ohms? Yes : GO to L3. No : REPAIR circuit 752 (YE/RD) for an open. TEST the system for normal operation.
3. L3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Measure the resistance between blower motor switch C294b-1, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : INSTALL a new blower motor switch. TEST the system for normal operation. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
4. L4 CHECK A/C BLOWER MOTOR CIRCUIT 261 (OG/BK) FOR VOLTAGE Key in ON position. Measure the voltage between A/C blower motor connector C2004-1, circuit 261 (OG/BK) and ground. Is the voltage greater than 10 volts? Yes : INSTALL a new blower motor. TEST the system for normal operation. No : GO to L5.
5. L5 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Relay. Measure the resistance between blower motor relay connector pin 87, circuit 261 (OG/BK) and blower motor C2004-1, circuit 261 (OG/BK). Is the resistance less than 5 ohms? Yes : GO to L6. No : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
6. L6 CHECK THE BLOWER MOTOR RELAY Connect: Blower Motor C2004. Key in ON position. Connect a fused jumper lead between blower motor relay socket pin 30, circuit 364 (BK/LG) and pin 87, circuit 261 (OG/BK). Does the blower motor operate? Yes : GO to L7. No : REPAIR the relay power circuit. TEST the system for normal operation.
7. L7 CHECK THE RELAY COIL SUPPLY VOLTAGE Key in OFF position. Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and ground. Is the voltage greater than 10 volts? Yes : GO to L8. No : REPAIR circuit 296 (WH/VT) for an open. TEST the system for normal operation.
8. L8 CHECK THE BLOWER MOTOR RELAY Key in ON position. Measure the voltage between blower motor relay socket pin 86, circuit 1322 (BN/WH) and socket pin 85, circuit 296 (WH/VT). Is the voltage greater than 10 volts? Yes : INSTALL a new blower motor relay. TEST the system for normal operation. No : GO to L9.
9. L9 CHECK CIRCUIT 1322 (BN/WH) FOR AN OPEN Key in OFF position. Disconnect: EMTC module C294a. Measure the resistance between blower motor relay connector pin 86, circuit 1322 (BN/WH) and EMTC module C294a-23, circuit 1322 (BN/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new EMTC module. TEST the system for normal operation. No : REPAIR circuit 1322 (BN/WH) for an open. TEST the system for normal operation.

Under normal operation, the blower motor is provided a ground from the blower resistor through circuit 752 (YE/RD). The resistor gets a ground from circuit 1205 (BK) in the lowest blower setting. In MED-LO and MED-HI the resistor gets a ground from the blower motor switch through circuit 260 (RD/OG) or 269 (LB/OG), depending on selected speed. In HI, the blower motor is grounded directly through the blower motor switch from circuit 752 (YE/RD) to circuit 1205 (BK). The blower switch receives its ground from circuit 1205 (BK).

1. An open in circuit 1205 (BK), 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
2. A short to ground in circuit 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
3. A short together circuits 260 (RD/OG), 269 (LB/OG) or 752 (YE/RD)
4. Blower motor resistor
5. Blower motor switch

Scheme 127

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

1. M1 CHECK THE BLOWER MOTOR OPERATION Key in ON position. Turn the function selector switch to the FLOOR position. Select all blower speed positions. Does the blower motor operate in any position? Yes : If the blower motor does not operate in HI, GO to M2. If the blower motor does not operate in MED-HI, GO to M3 . If the blower motor does not operate in MED-LO, GO to M4 . If the blower motor does not operate in LO, GO to M5 . For all other symptoms, GO to M9 . No : GO to «PINPOINT TEST L»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. M2 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C294b. Disconnect: Blower Motor C2004. Measure the resistance between blower motor switch C294b-2, circuit 752 (YE/RD) and blower motor C2004-2, circuit 752 (YE/RD). Is the resistance less than 5 ohms? Yes : GO to M6 . No : REPAIR circuit 752 (YE/RD) for an open. TEST the system for normal operation.
3. M3 CHECK CIRCUIT 269 (LB/OG) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C294b. Disconnect: Blower Motor Resistor C2185. Measure the resistance between blower motor switch C294b-3, circuit 269 (LB/OG) and blower motor resistor C2185-3, circuit 269 (LB/OG). Is the resistance less than 5 ohms? Yes : GO to M6 . No : REPAIR circuit 269 (LB/OG) for an open. TEST the system for normal operation.
4. M4 CHECK CIRCUIT 260 (RD/OG) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C294b. Disconnect: Blower Motor Resistor C2185. Measure the resistance between blower motor switch C294b-4, circuit 260 (RD/OG) and blower motor resistor C2185-1, circuit 260 (RD/OG). Is the resistance less than 5 ohms? Yes : GO to M6 . No : REPAIR circuit 260 (RD/OG) for an open. TEST the system for normal operation.
5. M5 CHECK BLOWER MOTOR RESISTOR GROUND CIRCUIT 1205 (BK) FOR AN OPEN Measure the resistance between blower motor resistor C2185-4, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : GO to M6. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
6. M6 CHECK THE BLOWER MOTOR RESISTOR CIRCUIT 752 (YE/RD) FOR AN OPEN Connect: Blower Motor C2004. Measure the resistance between blower motor resistor C2185-2, circuit 752 (YE/RD) and blower motor C2004-2, circuit 752 (YE/RD). Is the resistance less than 5 ohms? Yes : GO to M7. No : REPAIR circuit 752 (YE/RD) for an open. TEST the system for normal operation.
7. M7 CHECK THE BLOWER MOTOR RESISTOR Carry out the «Blower Motor Resistor»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) component test. Does the blower motor resistor test good? Yes : GO to M8. No : INSTALL a new blower motor resistor. TEST the system for normal operation.
8. M8 CHECK THE BLOWER MOTOR SWITCH CIRCUIT 1205 (BK) FOR AN OPEN Measure the resistance between blower motor switch C294b-1, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : INSTALL a new blower motor switch. TEST the system for normal operation. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
9. M9 CHECK CIRCUITS 752 (YE/RD), 260 (RD/OG) AND 269 (LB/OG) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Blower Motor C2004. Disconnect: Blower Motor Resistor C2185. Place the blower switch in the lowest setting. Measure the resistance between ground and blower motor resistor C2185, circuit: 260 (RD/OG) pin 1 752 (YE/RD) pin 2 269 (LB/OG) pin 3 Are the resistances less than 5 ohms? Yes : GO to M10. No : REPAIR the affected circuit. TEST the system for normal operation.
10. M10 CHECK THE BLOWER MOTOR CIRCUITS FOR SHORTS TOGETHER Measure the resistance between blower motor resistor C2185: pin 1, circuit 260 (RD/OG) and pin 2, circuit 752 (YE/RD). pin 1, circuit 260 (RD/OG) and pin 3, circuit 269 (LB/OG). pin 2, circuit 752 (YE/RD) and pin 3, circuit 269 (LB/OG). Are the resistances greater than 10,000 ohms? Yes : INSTALL a new blower motor switch. TEST the system for normal operation. No : REPAIR the affected circuits. TEST the system for normal operation.

Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 1322 (BN/WH). The coil receives voltage ignition voltage through circuit 296 (WH/VT). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 261 (OG/BK). Ground for the motor is provided through circuit 515 (BK/WH) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.

1. An open in circuit 1205 (BK), 261 (OG/BK), 1322 (BN/WH), 515 (BK/WH), 1120 (BK/WH), 296 (WH/VT) or 364 (BK/LG)
2. A short to ground in circuit 1120 (BK/WH)
3. A short to voltage in circuit 1322 (BN/WH)
4. Blower motor relay
5. Blower motor control module
6. EATC module
7. Blower motor

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

1. N1 VERIFY THE BLOWER MOTOR OPERATION Key in ON position. Press the PANEL button on the EATC module. Adjust the blower motor setting to LO and then to HI. Is the blower motor inoperative in all settings? Yes : GO to N2. No : GO to «PINPOINT TEST O»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. N2 CHECK FOR VOLTAGE TO THE BLOWER MOTOR Key in OFF position. Disconnect: Blower Motor C2004. Key in ON position. Measure the voltage between blower motor C2004-1, circuit 261 (OG/BK) and ground. Is the voltage greater than 10 volts? Yes : GO to N3. No : GO to N9 .
3. N3 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROLLER Key in OFF position. Disconnect: Blower Motor Speed Control C2185. Key in ON position. Measure the voltage between blower motor speed control C2185-4, circuit 261 (OG/BK) and ground. Is the voltage greater than 10 volts? Yes : GO to N4. No : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
4. N4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C2185-1, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : GO to N5. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.
5. N5 CHECK CIRCUIT 515 (OG/RD) FOR AN OPEN Measure the resistance between blower motor C2004-2, circuit 515 (OG/RD) and blower motor speed control C2185-2, circuit 515 (OG/RD). Is the resistance less than 5 ohms? Yes : GO to N6. No : REPAIR circuit 515 (OG/RD) for an open. TEST the system for normal operation.
6. N6 CHECK THE BLOWER MOTOR Connect: Blower Motor C2004. Connect a fused jumper lead between blower motor speed control C2185-2, circuit 515 (OG/RD) and C2185-1, circuit 1205 (BK). Key in ON position. Does the blower motor operate? Yes : GO to N7. No : INSTALL a new blower motor. TEST the system for normal operation.
7. N7 CHECK CIRCUIT 1120 (BK/WH) FOR A SHORT TO GROUND Key in OFF position. Remove the fused jumper lead from blower motor speed control C271. Disconnect: EATC Module C228b. Measure the resistance between blower motor speed control C2185-3, circuit 1120 (BK/WH) and ground. Is the resistance greater than 10,000 ohms? Yes : GO to N8. No : REPAIR circuit 1120 (BK/WH) for a short to ground. TEST the system for normal operation.
8. N8 CHECK CIRCUIT 1120 (BK/WH) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C2185-3, circuit 1120 (BK/WH) and EATC module C228b-22, circuit 1120 (BK/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new blower motor speed control. TEST the system for normal operation. If the blower motor is still inoperative, INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 1120 (BK/WH) for an open. TEST the system for normal operation.
9. N9 CHECK CIRCUIT 261 (OG/BK) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Relay. Measure the resistance between blower motor relay socket pin 87, circuit 261 (OG/BK) and blower motor C2004-1, circuit 261 (OG/BK). Is the resistance less than 5 ohms? Yes : GO to N10. No : REPAIR circuit 261 (OG/BK) for an open. TEST the system for normal operation.
10. N10 CHECK THE RELAY COIL SUPPLY VOLTAGE Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and ground. Is the voltage greater than 10 volts? Yes : GO to N11. No : REPAIR circuit 296 (WH/VT) for an open. TEST the system for normal operation.
11. N11 CHECK THE RELAY SWITCH POWER CIRCUIT FOR AN OPEN Measure the voltage between blower motor relay socket pin 30, circuit 364 (BK/LG) and ground. Is the voltage greater than 10 volts? Yes : GO to N12. No : REPAIR circuit 364 (BK/LG) for an open. TEST the system for normal operation.
12. N12 CHECK THE EATC MODULE OUTPUT Key in ON position. Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and socket pin 86, circuit 1322 (BN/WH). Is the voltage greater than 10 volts? Yes : INSTALL a new blower motor relay. TEST the system for normal operation. No : GO to N13.
13. N13 CHECK CIRCUIT 1322 (BN/WH) FOR SHORT TO A VOLTAGE Key in OFF position. Disconnect: EATC Module C228b. Key in ON position. Measure the voltage between blower motor relay socket pin 86, circuit 1322 (BN/WH) and ground. Is voltage present? Yes : REPAIR circuit 1322 (BN/WH). TEST the system for normal operation. No : GO to N14.
14. N14 CHECK CIRCUIT 1322 (BN/WH) FOR AN OPEN Measure the resistance between EATC module C228a-16, circuit 1322 (BN/WH) and blower motor relay socket pin 86, circuit 1322 (BN/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 1322 (BN/WH) for an open. TEST the system for normal operation.

Under normal operation, the blower motor relay coil receives a ground from the EATC module through circuit 1322 (BN/WH). The coil receives voltage ignition voltage through circuit 296 (WH/VT). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 261 (OG/BK). Ground for the motor is provided through circuit 515 (BK/WH) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.

1. An open in circuit 1120 (BK/WH)
2. A short to ground in circuit 515 (BK/WH) or circuit 1322 (BN/WH)
3. A short to voltage in circuit 1120 (BK/WH) or circuit 261 (OG/BK)
4. Blower motor control module
5. Blower motor relay
6. EATC module

Scheme 141

Scheme 142

1. O1 VERIFY THE BLOWER MOTOR OPERATION Key in ON position. Press the PANEL button on the EATC module. Adjust the blower motor setting to LO and then to HI. Does the blower motor operate at any setting? Yes : If the blower motor operates always in HI, GO to O2. If the blower motor is always ON, GO to O5 . No : GO to «PINPOINT TEST N»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. O2 CHECK CIRCUIT 515 (OG/RD) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Blower Motor Speed Control C2185. Key in ON position. Does the blower motor operate? Yes : REPAIR circuit 515 (OG/RD) for a short to ground. TEST the system for normal operation. No : GO to O3.
3. O3 CHECK CIRCUIT 1120 (BK/WH) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: EATC Module C228b. Key in ON position. Measure the voltage between blower motor speed control C2185-3, circuit 1120 (BK/WH) and ground. Is voltage present? Yes : REPAIR circuit 1120 (BK/WH) for a short to voltage. TEST the system for normal operation. No : GO to O4.
4. O4 CHECK CIRCUIT 1120 (BK/WH) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C2185-3, circuit 1120 (BK/WH) and EATC module C228b-22, circuit 1120 (BK/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new blower motor speed control. TEST the system for normal operation. No : REPAIR circuit 269 (LB/OG) for an open. TEST the system for normal operation.
5. O5 CHECK THE EATC MODULE OUTPUT Key in OFF position. Disconnect: Blower Motor Relay. Key in ON position. Press the EATC OFF button. Measure the voltage between blower motor relay socket pin 85, circuit 296 (WH/VT) and socket pin 86, circuit 1322 (BN/WH). Is the voltage greater than 10 volts? Yes : GO to O6. No : GO to O7 .
6. O6 CHECK CIRCUIT 1322 (BN/WH) FOR A SHORT TO GROUND Key in OFF position. Disconnect: EATC Module C228b. Measure the resistance between blower motor relay socket pin 86, circuit 1322 (BN/WH) and ground. Is the resistance greater than 10,000 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 1322 (BN/WH) for a short to ground. TEST the system for normal operation.
7. O7 CHECK CIRCUIT 261 (OG/BK) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Blower Motor C2004. Key in ON position. Measure the voltage between blower motor C2004-1, circuit 261 (OG/BK) and ground. Is the voltage greater than 10 volts? Yes : REPAIR circuit 261 (OG/BK) for a short to voltage. TEST the system for normal operation. No : INSTALL a new blower motor speed control. TEST the system for normal operation. If the blower motor still does not operate correctly, INSTALL a new EATC module. TEST the system for normal operation.

Under normal operation, the auxiliary blower motor relay coil receives ignition voltage through circuit 181 (BN/OG). The coil receives ground from the electronic automatic temperature control (EATC) module through circuit 1371 (TN/OG) if any auxiliary blower speed but OFF is selected. Voltage is supplied to the relay switch contact through circuit 1004 (LB/RD). When the relay coil is energized, voltage is delivered to the blower motor through circuit 536 (BK/LG). Ground for the blower motor is provided through circuit 515 (OG/RD) from the blower motor resistor. The blower resistor is grounded through circuit 1205 (BK).

1. An open in circuit 181 (BN/OG), 1004 (LB/RD), 1371 (TN/OG), 1205 (BK), 536 (BK/LG) or 515 (OG/RD).
2. Auxiliary blower motor
3. Auxiliary blower motor relay 1
4. Auxiliary blower motor resistor

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Scheme 144

1. P1 CHECK CIRCUIT 536 (BK/LG) FOR VOLTAGE Key in OFF position. Disconnect: Auxiliary Blower Motor C3021. Key in ON position. Measure the voltage between auxiliary blower motor C3021-1, circuit 536 (BK/LG) and ground. Is the voltage greater than 10 volts? Yes : GO to P6 . No : GO to P2.
2. P2 CHECK CIRCUIT 181 (BN/OG) FOR VOLTAGE Key in OFF position. Disconnect: Auxiliary Blower Motor Relay 1. Key in ON position. Measure the voltage between the auxiliary blower motor relay 1 socket pin 30, circuit 181 (BN/OG) and ground. Is the voltage greater than 10 volts? Yes : GO to P3. No : REPAIR circuit 181 (BN/OG) for an open. TEST the system for normal operation.
3. P3 CHECK CIRCUIT 1004 (LB/RD) FOR VOLTAGE Measure the voltage between the auxiliary blower motor relay 1 socket pin 85, circuit 1004 (LB/RD) and ground. Is the voltage greater than 10 volts? Yes : GO to P4. No : REPAIR circuit 1004 (LB/RD) for an open. TEST the system for normal operation.
4. P4 CHECK CIRCUIT 1371 (TN/OG) FOR GROUND Measure the resistance between the auxiliary blower motor relay 1 socket pin 86, circuit 1371 (TN/OG) and ground. Is the resistance less than 5 ohms? Yes : CARRY OUT the relay component test on the auxiliary blower motor relay 1. If OK, REPAIR circuit 536 (BK/LG) for an open. TEST the system for normal operation. No : GO to P5.
5. P5 CHECK CIRCUIT 1371 (TN/OG) FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228a. Measure the resistance between EATC module C228a-23, circuit 1371 (TN/OG) and auxiliary blower motor relay socket pin 86, circuit 1371 (TN/OG). Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 1371 (TN/OG) for an open. TEST the system for normal operation.
6. P6 CHECK CIRCUIT 515 (OG/RD) FOR GROUND Key in OFF position. Measure the resistance between auxiliary blower motor C3021-2, circuit 515 (OG/RD) and ground. Is the resistance less than 5 ohms? Yes : INSTALL a new auxiliary blower motor. TEST the system for normal operation. No : GO to P7.
7. P7 CHECK CIRCUIT 1205 (BK) FOR GROUND Key in OFF position. Disconnect: Auxiliary Blower Motor Resistor C3022. Measure the resistance between auxiliary blower motor resistor C3022-2, circuit 1205 (BK) and ground. Is the resistance less than 5 ohms? Yes : CARRY OUT the component test on the «Auxiliary Blower Motor Resistor»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . If OK, REPAIR circuit 515 (OG/RD) for an open between the auxiliary blower motor and splice S396. TEST the system for normal operation. No : REPAIR circuit 1205 (BK) for an open. TEST the system for normal operation.

Under normal operation, ground for the blower motor is provided through circuit 515 (OG/RD) from the blower motor resistor. The blower resistor is grounded through circuit 1205 (BK). The blower motor speed relay coils are supplied through circuit 1004 (LB/RD). Blower motor speed is received by the electronic automatic temperature control (EATC) module from the rear auxiliary control through circuit 1125 (BN). Reference voltage for the blower speed selector resistor is provided by the EATC module through circuit 1381 (WH/LB). The auxiliary blower motor relay coil receives ground from the EATC module through circuit 1371 (TN/OG) if any blower speed but OFF is selected.

In LO, ground for the blower motor is provided through the blower motor resistor.

In MED-LO, blower motor speed relay 3 is grounded by the EATC module through circuit 1372 (PK/BK). Blower motor ground circuit 515 (OG/RD) is connected through one half of the blower motor resistor to circuit 751 (DB/WH). Circuit 751 (DB/WH) is connected through blower motor speed relay 3 to the blower motor resistor through circuit 752 (YE/RD). The blower resistor is grounded through circuit 1205 (BK).

In MED-HI, blower motor relay 2 is grounded by the EATC module through circuit 1373 (GY/YE). Blower motor ground circuit 515 (OG/RD) is connected through blower motor speed relay 2 to circuit 751 (DB/WH). Circuit 751 (DB/WH) is connected through one half of the blower motor resistor to the blower motor resistor to ground circuit 1205 (BK).

In HI, blower motor speed relays 2 and 3 are grounded by the EATC module through circuit 1372 (PK/BK) and 1373 (GY/YE). Blower motor ground circuit 515 (OG/RD) is connected through blower motor speed relay 2 to circuit 751 (DB/WH). Circuit 751 (DB/WH) is connected through blower motor speed relay 3 to the blower motor resistor ground circuit 1205 (BK) by circuit 752 (YE/RD).

1. An open in circuit 1372 (PK/BK), 1373 (GY/YE), 1004 (LB/RD), 751 (DB/WH), 752 (YE/RD) or 515 (OG/RD)
2. A short to ground in circuit 1371 (TN/OG), 1372 (PK/BK), 1373 (GY/YE), 515 (OG/RD) or 751 (DB/WH)
3. A short to voltage in circuit 536 (BK/LG)
4. A short together circuits 751 (DB/WH), 752 (YE/RD) and 515 (OG/RD)
5. Auxiliary blower motor relay
6. Auxiliary blower motor speed relay 1
7. Auxiliary blower motor speed relay 2
8. Auxiliary blower motor speed relay 3
9. Auxiliary blower motor resistor
10. EATC module

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Scheme 151

1. Q1 CHECK AUXILIARY BLOWER MOTOR OPERATION Key in ON position. Turn the auxiliary climate controls OFF. Is the auxiliary blower motor ON? Yes : CARRY OUT the relay component test on the «Auxiliary Blower Motor Resistor»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) 1. If OK, GO to Q2. No : GO to Q4 .
2. Q2 CHECK CIRCUIT 536 (BK/LG) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Auxiliary Blower Motor C3021. Disconnect: Auxiliary Blower Motor Speed Relay 1. Key in ON position. Measure the voltage between the auxiliary blower motor relay socket pin 87, circuit 536 (BK/LG) and ground. Is voltage present? Yes : REPAIR circuit 536 (BK/LG) for a short to voltage. TEST the system for normal operation. No : GO to Q3.
3. Q3 CHECK CIRCUITS 1371 (TN/OG) FOR A SHORT TO GROUND Key in OFF position. Disconnect: EATC C228a. Measure the resistance between ground and auxiliary blower motor relay 1 socket pin 86, circuit 1371 (TN/OG). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 1371 (TN/OG) for a short to ground. TEST the system for normal operation.
4. Q4 CHECK AUXILIARY BLOWER MOTOR OPERATION Select all auxiliary blower speeds. Is the auxiliary blower motor always 1 speed? Yes : GO to Q5. No : GO to Q6 .
5. Q5 CHECK CIRCUIT 515 (OG/RD) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Auxiliary Blower Motor Resistor C3022. Measure the resistance between auxiliary blower motor relay socket pin 87, circuit 515 (OG/RD) and ground. Is the resistance less than 5 ohms? Yes : INSTALL a new EATC module. TEST the system for normal operation. No : REPAIR circuit 515 (OG/RD) for a short to ground. TEST the system for normal operation.
6. Q6 CHECK AUXILIARY BLOWER MOTOR OPERATION Select all auxiliary blower speeds. Is the auxiliary blower motor inoperative in any speed? Yes : CARRY OUT the component test on the «Auxiliary Blower Motor Resistor»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . If OK, REPAIR circuit 515 (OG/RD) for an open between the blower motor resistor and splice S396. TEST the system for normal operation. No : CARRY OUT the relay component test on the auxiliary blower motor relay 2 and 3. If OK, GO to Q7.
7. Q7 CHECK CIRCUIT 1004 (LB/RD) FOR VOLTAGE Key in OFF position. Disconnect: Auxiliary Blower Motor Speed Relay 2 and 3. Key in ON position. Measure the voltage between the auxiliary blower motor relay 2 and 3 socket pin 85, circuit 1004 (LB/RD) and ground. Is the voltage greater than 10 volts? Yes : GO to Q8. No : REPAIR circuit 1004 (LB/RD) for an open. TEST the system for normal operation.
8. Q8 CHECK CIRCUITS 1372 (PK/BK) AND 1373 (GY/YE) FOR A SHORT TO GROUND Key in OFF position. Disconnect: EATC C228a. Disconnect: EATC C228b. Measure the resistance between ground and: auxiliary blower motor relay 2 socket pin 86, circuit 1372 (PK/BK). auxiliary blower motor relay 3 socket pin 86, circuit 1373 (GY/YE). Are the resistances greater than 10,000 ohms? Yes : GO to Q9. No : REPAIR circuit 1372 (PK/BK) or 1373 (GY/YE) for a short to ground. TEST the system for normal operation.
9. Q9 CHECK CIRCUITS 1372 (PK/BK) AND 1373 (GY/YE) FOR AN OPEN Measure the resistance between: EATC module C228a-11, circuit 1372 (PK/BK) and auxiliary blower motor relay 2 socket pin 86, circuit 1372 (PK/BK). EATC module C228b-15, circuit 1373 (GY/YE) and auxiliary blower motor relay 3 socket pin 86, circuit 1373 (GY/YE). Are the resistances less than 5 ohms? Yes : GO to Q10. No : REPAIR circuit 1372 (PK/BK) or 1373 (GY/YE) for an open. TEST the system for normal operation.
10. Q10 CHECK CIRCUIT 751 (DB/WH) FOR AN OPEN Disconnect: Auxiliary Blower Motor Resistor C3022. Measure the resistance between auxiliary blower motor resistor C3022-1, circuit 751 (DB/WH) and: auxiliary blower motor relay 2 socket pin 30, circuit 751 (DB/WH). auxiliary blower motor relay 3 socket pin 30, circuit 751 (DB/WH). Are the resistances less than 5 ohms? Yes : GO to Q11. No : REPAIR circuit 751 (DB/WH) for an open. TEST the system for normal operation.
11. Q11 CHECK CIRCUITS 751 (DB/WH) FOR A SHORT TO GROUND Measure the resistance between ground and auxiliary blower motor relay 2 and 3 socket pin 86, circuit 751 (DB/WH). Is the resistance greater than 10,000 ohms? Yes : GO to Q12. No : REPAIR circuit 751 (DB/WH) for a short to ground. TEST the system for normal operation.
12. Q12 CHECK CIRCUIT 752 (YE/RD) FOR AN OPEN Measure the resistance between auxiliary blower motor resistor C3022-3, circuit 752 (YE/RD) and auxiliary blower motor relay 3 socket pin 87, circuit 752 (YE/RD). Is the resistance less than 5 ohms? Yes : GO to Q13. No : REPAIR circuit 752 (YE/RD) for an open. TEST the system for normal operation.
13. Q13 CHECK CIRCUITS 751 (DB/WH), 752 (YE/RD) AND 515 (OG/RD) FOR A SHORT TOGETHER Measure the resistance between auxiliary blower motor resistor C3022-4, circuit 515 (OG/RD) and auxiliary blower motor resistor C3022-1, circuit 751 (DB/WH). C3022-4, circuit 515 (OG/RD) and auxiliary blower motor resistor C3022-3, circuit 752 (YE/RD). C3022-1, circuit 751 (DB/WH) and auxiliary blower motor resistor C3022-3, circuit 752 (YE/RD). Are the resistances greater than 10,000 ohms? Yes : REPAIR circuit 515 (OG/RD) for an open between auxiliary blower motor relay 2 and the auxiliary blower motor resistor. TEST the system for normal operation. No : REPAIR circuit 751 (DB/WH), 752 (YE/RD) or 515 (OG/RD) for a short together. TEST the system for normal operation.

Under normal operation, to rotate the mode door actuator clockwise, the EATC module supplies voltage to the auxiliary temperature door actuator through the circuit 1376 (BK/LB), and supplies ground through circuit 1375 (PK/YE). To rotate the auxiliary temperature door actuator counterclockwise, the EATC module reverses the voltage and ground circuits.

The auxiliary temperature door actuator feedback resistor is supplied a ground from the EATC module through circuit 1377 (TN/LG) and a 5-volt reference voltage on circuit 1381 (WH/LB). The EATC module reads the voltage on the auxiliary temperature door actuator feedback circuit 1378 (GY/WH) to determine the auxiliary temperature door actuator position by the position of the actuator feedback resistor wiper arm.

1. An open, short to voltage, ground or together in circuits 1376 (BK/LB), 1375 (PK/YE), 1377 (TN/LG), 1381 (WH/LB) and 1378 (GY/WH)
2. Auxiliary temperature door actuator
3. EATC module
4. Stuck or bound linkage or door

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Scheme 170

1. R1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: EATC Module C228a. Disconnect: EATC Module C228b. Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Disconnect: Auxiliary Climate Controls C990. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228a-22, circuit 1377 (TN/LG). Is the resistance between 8,400 and 12,600 ohms? Yes : GO to R2. No : If the resistance is greater than 12,600 ohms, GO to R4 . If the resistance is less than 8,400 ohms, GO to R6 .
2. R2 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and EATC module C228b-10, circuit 1378 (GY/WH). Is the resistance between 250 and 10,250 ohms? Yes : GO to R3. No : If the resistance is greater than 10,250 ohms, GO to R7 . If the resistance is less than 250 ohms, GO to R8 .
3. R3 CHECK POTENTIOMETER HIGH SIDE RESISTANCE Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228b-10, circuit 1378 (GY/WH). Is the resistance between 250 and 10,250 ohms? Yes : GO to R10 . No : If the resistance is greater than 10,250 ohms, INSTALL a new door actuator. TEST the system for normal operation. If the resistance is less than 250 ohms, GO to R9 .
4. R4 CHECK CIRCUIT 1381 (WH/LB) FOR AN OPEN Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and auxiliary temperature door actuator C3275-3, circuit 1381 (WH/LB). Is the resistance less than 5 ohms? Yes : GO to R5. No : REPAIR circuit 1381 (WH/LB) for an open. TEST the system for normal operation.
5. R5 CHECK THE ACTUATOR RETURN CIRCUIT 1377 (TN/LG) FOR AN OPEN Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and auxiliary temperature door actuator C3275-2, circuit 1377 (TN/LG). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 1377 (TN/LG) for an open. TEST the system for normal operation.
6. R6 CHECK CIRCUIT 1377 (TN/LG) AND CIRCUIT 1381 (WH/LB) FOR A SHORT TOGETHER Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228a-22, circuit 1377 (TN/LG). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1377 (TN/LG) and circuit 1381 (WH/LB) for a short together. TEST the system for normal operation.
7. R7 CHECK CIRCUIT 1378 (GY/WH) FOR AN OPEN Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between EATC module C228b-10, circuit 1378 (GY/WH) and auxiliary temperature door actuator C3275-4, circuit 1378 (GY/WH). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 1378 (GY/WH) for an open. TEST the system for normal operation.
8. R8 CHECK CIRCUIT 1377 (TN/LG) FOR A SHORT TO CIRCUIT 1378 (GY/WH) Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and EATC module C228b-10, circuit 1378 (GY/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1377 (TN/LG) and circuit 1378 (GY/WH) for a short together. TEST the system for normal operation.
9. R9 CHECK CIRCUIT 1381 (WH/LB) FOR A SHORT TO CIRCUIT 1378 (GY/WH) Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228b-10, circuit 1378 (GY/WH). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1381 (WH/LB) and circuit 1378 (GY/WH) for a short together. TEST the system for normal operation.
10. R10 CHECK CIRCUIT 1381 (WH/LB) OR 1378 (GY/WH) FOR A SHORT TO GROUND Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between ground and the following: EATC module C228a-21, circuit 1381 (WH/LB). EATC module C228b-10, circuit 1378 (GY/WH). Is the resistance greater than 10,000 ohms? Yes : GO to R11. No : REPAIR circuit(s) for a short to ground. TEST the system for normal operation.
11. R11 CHECK CIRCUIT 1377 (TN/LG) OR 1378 (GY/WH) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: EATC module C228a-22, circuit 1377 (TN/LG). EATC module C228b-10, circuit 1378 (GY/WH). Is voltage present? Yes : REPAIR circuit(s) for a short to power. TEST the system for normal operation. No : GO to R12.
12. R12 CHECK DOOR ACTUATOR CLOCKWISE OPERATION Key in OFF position. Connect: Auxiliary Temperature Door Actuator C3275. Remove the door actuator and disengage the actuator driveshaft from the actuator door. Mark the door actuator driveshaft position. Key in ON position. Connect a fused jumper wire between EATC module C228a-26, circuit 483 (RD) and EATC module C228b-24, circuit 1376 (BK/LB). Connect a second fused jumper wire between EATC module C228a-1, circuit 1203 (BK/LB) and EATC module C228b-23, circuit 1375 (PK/YE). Does the actuator motor move in the clockwise direction? Yes : GO to R13. No : GO to R14 .
13. R13 CHECK DOOR ACTUATOR COUNTERCLOCKWISE OPERATION Connect a fused jumper wire between EATC module C228a-1, circuit 1203 (BK/LB) and EATC module C228b-24, circuit 1376 (BK/LB). Connect a second fused jumper wire between EATC module C228a-26, circuit 483 (RD) and EATC module C228b-23, circuit 1375 (PK/YE). Does the actuator motor move in the counterclockwise direction? Yes : INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EATC. TEST the system for normal operation. No : GO to R14.
14. R14 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: Auxiliary Temperature Door Actuator C3275. Measure the resistance between EATC module C228b-24, circuit 1376 (BK/LB) and auxiliary temperature door actuator C3275-6, circuit 1376 (BK/LB). Measure the resistance between EATC module C228b-23, circuit 1375 (PK/YE) and auxiliary temperature door actuator C3275-1, circuit 1375 (PK/YE). Are the resistances less than 5 ohms? Yes : GO to R15. No : REPAIR the circuit(s) for an open. TEST the system for normal operation.
15. R15 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND Measure the resistance between ground and EATC module C228b-24, circuit 1376 (BK/LB). Measure the resistance between ground and EATC module C228b-23, circuit 1375 (PK/YE). Are the resistances greater than 10,000 ohms? Yes : GO to R16. No : REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
16. R16 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and EATC module C228b-24, circuit 1376 (BK/LB). Measure the voltage between ground and EATC module C228b-23, circuit 1375 (PK/YE). Is voltage present? Yes : REPAIR the circuit(s) for a short to power. TEST the system for normal operation. No : GO to R17.
17. R17 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between EATC module C228b-23, circuit 1375 (PK/YE) and EATC module C228b-24, circuit 1376 (BK/LB). Is the resistance greater than 10,000 ohms? Yes : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit(s) for a short together. TEST the system for normal operation.

Under normal operation, to rotate the mode door actuator clockwise, the EATC module supplies voltage to the auxiliary panel/floor door actuator through the circuit 1380 (TN/YE), and supplies ground through circuit 1379 (PK/LB). To rotate the auxiliary panel/floor door actuator counterclockwise, the EATC module reverses the voltage and ground circuits.

The auxiliary panel/floor door actuator feedback resistor is supplied a ground from the EATC module through circuit 1377 (TN/LG) and a 5-volt reference voltage on circuit 1381 (WH/LB). The EATC module reads the voltage on the auxiliary panel/floor door actuator feedback circuit 1382 (BK/OG) to determine the auxiliary panel/floor door actuator position by the position of the actuator feedback resistor wiper arm.

1. An open, short to voltage, ground or together in circuits 1380 (TN/YE), 1379 (PK/LB), 1377 (TN/LG), 1381 (WH/LB) and 1382 (BK/OG)
2. Auxiliary panel/floor door actuator
3. EATC module
4. Stuck or bound linkage or door

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1. S1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: EATC Module C228a. Disconnect: EATC Module C228b. Disconnect: Auxiliary Temperature Blend Door Actuator C3275. Disconnect: Auxiliary Climate Controls C990. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228a-22, circuit 1377 (TN/LG). Is the resistance between 8,400 and 12,600 ohms? Yes : GO to S2. No : If the resistance is greater than 12,600 ohms, GO to S4 . If the resistance is less than 8,400 ohms, GO to S6 .
2. S2 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and EATC module C228b-11, circuit 1382 (BK/OG). Is the resistance between 250 and 10,250 ohms? Yes : GO to S3. No : If the resistance is greater than 10,250 ohms, GO to S7 . If the resistance is less than 250 ohms, GO to S8 .
3. S3 CHECK POTENTIOMETER HIGH SIDE RESISTANCE Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228b-11, circuit 1382 (BK/OG). Is the resistance between 250 and 10,250 ohms? Yes : GO to S10 . No : If the resistance is greater than 10,250 ohms, INSTALL a new door actuator. TEST the system for normal operation. If the resistance is less than 250 ohms, GO to S9 .
4. S4 CHECK CIRCUIT 1381 (WH/LB) FOR AN OPEN Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and auxiliary panel/floor door actuator C3274-1, circuit 1381 (WH/LB). Is the resistance less than 5 ohms? Yes : GO to S5. No : REPAIR circuit 1381 (WH/LB) for an open. TEST the system for normal operation.
5. S5 CHECK THE ACTUATOR RETURN CIRCUIT 1377 (TN/LG) FOR AN OPEN Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and auxiliary panel/floor door actuator C3274-3, circuit 1377 (TN/LG). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 1377 (TN/LG) for an open. TEST the system for normal operation.
6. S6 CHECK CIRCUIT 1377 (TN/LG) AND CIRCUIT 1381 (WH/LB) FOR A SHORT TOGETHER Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228a-22, circuit 1377 (TN/LG). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1377 (TN/LG) and circuit 1381 (WH/LB) for a short together. TEST the system for normal operation.
7. S7 CHECK CIRCUIT 1382 (BK/OG) FOR AN OPEN Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228b-11, circuit 1382 (BK/OG) and auxiliary panel/floor door actuator C3274-2, circuit 1382 (BK/OG). Is the resistance less than 5 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit 1382 (BK/OG) for an open. TEST the system for normal operation.
8. S8 CHECK CIRCUIT 1377 (TN/LG) FOR A SHORT TO CIRCUIT 1382 (BK/OG) Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228a-22, circuit 1377 (TN/LG) and EATC module C228b-11, circuit 1382 (BK/OG). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1377 (TN/LG) and circuit 1382 (BK/OG) for a short together. TEST the system for normal operation.
9. S9 CHECK CIRCUIT 1381 (WH/LB) FOR A SHORT TO CIRCUIT 1382 (BK/OG) Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228b-11, circuit 1382 (BK/OG). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuits 1381 (WH/LB) and circuit 1382 (BK/OG) for a short together. TEST the system for normal operation.
10. S10 CHECK CIRCUIT 1381 (WH/LB) OR 1382 (BK/OG) FOR A SHORT TO GROUND Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between ground and the following: EATC module C228a-21, circuit 1381 (WH/LB). EATC module C228b-11, circuit 1382 (BK/OG). Is the resistance greater than 10,000 ohms? Yes : GO to S11. No : REPAIR circuit(s) for a short to ground. TEST the system for normal operation.
11. S11 CHECK CIRCUIT 1377 (TN/LG) OR 1382 (BK/OG) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: EATC module C228a-22, circuit 1377 (TN/LG). EATC module C228b-11, circuit 1382 (BK/OG). Is voltage present? Yes : REPAIR circuit(s) for a short to power. TEST the system for normal operation. No : GO to S12.
12. S12 CHECK DOOR ACTUATOR CLOCKWISE OPERATION Key in OFF position. Connect: Auxiliary Panel/Floor Door Actuator C3274. Remove the door actuator and disengage the actuator driveshaft from the actuator door. Mark the door actuator driveshaft position. Key in ON position. Connect a fused jumper wire between EATC module C228a-26, circuit 483 (RD) and EATC module C228b-26, circuit 1380 (TN/YE). Connect a second fused jumper wire between EATC module C228a-1, circuit 1203 (BK/LB) and EATC module C228b-25, circuit 1379 (PK/LB). Does the actuator motor move in the clockwise direction? Yes : GO to S13. No : GO to S14 .
13. S13 CHECK DOOR ACTUATOR COUNTERCLOCKWISE OPERATION Connect a fused jumper wire between EATC module C228a-1, circuit 1203 (BK/LB) and EATC module C228b-26, circuit 1380 (TN/YE). Connect a second fused jumper wire between EATC module C228a-26, circuit 483 (RD) and EATC module C228b-25, circuit 1379 (PK/LB). Does the actuator motor move in the counterclockwise direction? Yes : INSPECT for binding or broken door and linkage. If no condition is found, INSTALL a new EATC. TEST the system for normal operation. No : GO to S14.
14. S14 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between EATC module C228b-26, circuit 1380 (TN/YE) and auxiliary panel/floor door actuator C3274-6, circuit 1380 (TN/YE). Measure the resistance between EATC module C228b-25, circuit 1379 (PK/LB) and auxiliary panel/floor door actuator C3274-5, circuit 1379 (PK/LB). Are the resistances less than 5 ohms? Yes : GO to S15. No : REPAIR the circuit(s) for an open. TEST the system for normal operation.
15. S15 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO GROUND Measure the resistance between ground and EATC module C228b-2b, circuit 1380 (TN/YE). Measure the resistance between ground and EATC module C228b-25, circuit 1379 (PK/LB). Are the resistances greater than 10,000 ohms? Yes : GO to S16. No : REPAIR the circuit(s) for a short to ground. TEST the system for normal operation.
16. S16 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and EATC module C228b-26, circuit 1380 (TN/YE). Measure the voltage between ground and EATC module C228b-25, circuit 1379 (PK/LB). Is voltage present? Yes : REPAIR the circuit(s) for a short to power. TEST the system for normal operation. No : GO to S17.
17. S17 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between EATC module C228b-25, circuit 1379 (PK/LB) and EATC module C228b-26, circuit 1380 (TN/YE). Is the resistance greater than 10,000 ohms? Yes : INSPECT for binding or broken linkage. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. No : REPAIR circuit(s) for a short together. TEST the system for normal operation.

Under normal operation, the panel/floor and cool/warm signal is received by the EATC module from the rear auxiliary control through circuit 1121 (DG/YE). The blower speed signal is received by the EATC from the rear auxiliary control through circuit 1125 (BN). Reference voltage for the auxiliary controls signal resistor is provided by the EATC module through circuit 1381 (WH/LB). Ground for the auxiliary controls signal resistor is provided by the EATC module through circuit 1377 (TN/LG).

1. An open in circuit 1377 (TN/LG), 1121 (DG/YE), 1125 (BN) or 1381 (WH/LB)
2. A short to ground in circuit 1121 (DG/YE), 1125 (BN) or 1381 (WH/LB)
3. A short to voltage in circuit 1121 (DG/YE), 1125 (BN) or 1377 (TN/LG)
4. A short together circuits 1377 (TN/LG) and 1121 (DG/YE), 1125 (BN) or 1381 (WH/LB)
5. A short together circuits 1121 (DG/YE) and 1125 (BN)
6. Rear auxiliary control
7. EATC module

Scheme 190

Scheme 191

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

1. T1 CHECK EATC DTCS Key in ON position. Check for EATC DTCs. Is DTC B2918 or B2919 present? Yes : One DTC present, GO to T2. Both DTCs present, GO to T4 . No : GO to T6 .
2. T2 CHECK CIRCUIT 1121 (DG/YE) OR 1125 (BN) FOR AN OPEN Key in OFF position. Disconnect: Auxiliary Controls C990. Disconnect: EATC Module C228b. Measure the resistance between EATC module: (DTC B2918 only) C228b-13, circuit 1121 (DG/YE) and auxiliary controls C990-4, circuit 1121 (DG/YE). (DTC B2919 only) C228b-12, circuit 1125 (BN) and auxiliary controls J990-2, circuit 1125 (BN). Are the resistances less than 5 ohms? Yes : GO to T3. No : REPAIR circuit 1121 (DG/YE) or 1125 (BN) for an open. TEST the system for normal operation.
3. T3 CHECK CIRCUIT 1121 (DG/YE) OR 1125 (BN) FOR A SHORT TO GROUND Measure the resistance between ground and EATC module: (DTC B2918 only) C228b-13. (DTC B2919 only) C228b-12. Are the resistances greater than 10,000 ohms? Yes : REPAIR circuit 1121 (DG/YE) or 1125 (BN) for a short to circuit 1377 (TN/LG). TEST the system for normal operation. No : REPAIR circuit 1121 (DG/YE) or 1125 (BN) for a short to ground. TEST the system for normal operation.
4. T4 CHECK CIRCUIT 1377 (TN/LG) AND CIRCUIT 1381 (WH/LB) FOR AN OPEN Key in OFF position. Disconnect: Auxiliary Controls C990. Disconnect: EATC Module C228a. Measure the resistance between EATC module: C228a-21, circuit 1381 (WH/LB) and auxiliary controls C990-3, circuit 1381 (WH/LB). C228a-22, circuit 1377 (TN/LG) and auxiliary controls C990-1, circuit 1377 (TN/LG). Is the resistance greater than 10,000 ohms? Yes : GO to T5. No : REPAIR circuits 1377 (TN/LG) or 1381 (WH/LB) for an open. TEST the system for normal operation.
5. T5 CHECK CIRCUIT 1381 (WH/LB) FOR A SHORT TO GROUND Disconnect: Auxiliary Temperature Door Actuator C3275. Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Measure the resistance between ground and the following EATC module C228a-21, circuit 1381 (WH/LB). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new auxiliary control. TEST the system for normal operation. No : REPAIR circuit 1381 (WH/LB) for a short to ground. TEST the system for normal operation.
6. T6 CHECK CIRCUIT 1121 (DG/YE) AND 1125 (BN) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Auxiliary Controls C990. Disconnect: EATC Module C228b. Key in ON position. Measure the voltage between EATC module: C228b-12, circuit 1125 (BN). C228b-13, circuit 1121 (DG/YE). Is voltage present? Yes : REPAIR circuit 1121 (DG/YE) or 1125 (BN) for a short to voltage. TEST the system for normal operation. No : GO to T7.
7. T7 CHECK CIRCUIT 1377 (TN/LG) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Auxiliary Temperature Door Actuator C3275. Disconnect: Auxiliary Panel/Floor Door Actuator C3274. Key in ON position. Measure the voltage between ground and the following EATC module J228a-22, circuit 1377 (TN/LG). Is voltage present? Yes : REPAIR circuit 1377 (TN/LG) for a short to voltage. TEST the system for normal operation. No : GO to T8.
8. T8 CHECK CIRCUIT 1377 (TN/LG) AND CIRCUIT 1381 (WH/LB) FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between EATC module C228a-21, circuit 1381 (WH/LB) and EATC module C228a-22, circuit 1377 (TN/LG). Is the resistance greater than 10,000 ohms? Yes : GO to T9. No : REPAIR circuits 1377 (TN/LG) and circuit 1381 (WH/LB) for a short together. TEST the system for normal operation.
9. T9 CHECK CIRCUITS 1121 (DG/YE) AND 1125 (BN) FOR A SHORT TOGETHER Measure the resistance between EATC module C228b-13, circuit 1121 (DG/YE) and EATC module C228b-12, circuit 1125 (BN). Is the resistance greater than 10,000 ohms? Yes : INSTALL a new auxiliary control. TEST the system for normal operation. No : REPAIR circuits 1121 (DG/YE) and 1125 (BN) for a short together. TEST the system for normal operation.

Scheme 197

BLOWER MOTOR RESISTOR PINS AND RESISTANCE CHART

Scheme 198

Scheme 199

Scheme 200

Heater Core

1. Inspect for evidence of coolant leakage at the heater hose to heater core attachments. A coolant leak in the heater hose could follow the heater core tube to the heater core and appear as a leak in the heater core.
2. Check the integrity of the heater hose clamps.

Heater Core - Plugged

1. Check to see that the engine coolant is at the correct level.
2. Start the engine and turn on the heater.
3. When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hoses to see if they are hot.
4. If the outlet only is not hot: the heater core may have an air pocket. the heater core may be plugged.
5. If the inlet only is not hot: the thermostat may not be working correctly.

Heater Core - Pressure Test

Use the Pressure Test Kit to carry out the pressure test.

Scheme 201

1. Drain the coolant from the cooling system.
2. Disconnect the heater hoses from the heater core.
3. Install a short piece of heater hose, approximately 101-mm (4-in) long on each heater core tube.
4. Fill the heater core and heater hoses with water and install the 2 plugs BT-7422-B and the adapter BT-7422-A from the Pressure Test Kit. Secure the heater hoses, plug and adapter with hose clamps.
5. Attach the pump and gauge assembly from the Pressure Test Kit to the adapter.
6. Close the bleed valve at the base of the gauge. Pump 138 kPa (20 psi) of air pressure into the heater core.
7. Observe the pressure gauge for a minimum of 3 minutes.
8. If the pressure drops, check the heater hose connections to the core tubes for leaks. If the heater hoses do not leak, remove the heater core from the vehicle and carry out the «HEATER CORE - Bench Test»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .

Scheme 202

1. Remove the heater core from the vehicle.
2. Drain all of the coolant from the heater core.
3. Connect the 101-mm (4-in) test heater hoses with plug and adapter to the core tubes. Then connect the Pressure Test Kit to the adapter.
4. Apply 138 kPa (20 psi) of air pressure to the heater core. Submerge the heater core in water.
5. If a leak is observed, install a new heater core.

Evaporator/Condenser Core - On-Vehicle Leak Test

1. Discharge and recover the refrigerant. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. Disconnect the suspect evaporator core or condenser core from the A/C system.
3. Clean the manifold fittings.
4. Connect the appropriate test fittings from the A/C Fittings Set to the condenser or evaporator core tube connections.
5. Connect the red and blue hoses from the R-134a Manifold Gauge Set to the test fittings on the evaporator core or condenser core. Connect the yellow hose to a known good vacuum pump.
6. Open both gauge set valves and start the vacuum pump. Allow the vacuum pump to operate for a minimum of 45 minutes after the gauge set low pressure gauge indicates 101 kPa (30 in-Hg). The 45-minute evacuation is necessary to remove any refrigerant from oil left in the evaporator core or condenser core. If the refrigerant is not completely removed from the oil, outgassing will degrade the vacuum and appear as a refrigerant leak.
7. If the low pressure gauge reading will not drop to 101 kPa (30 in-Hg) when the valves on the gauge and manifold set are open and the vacuum pump is operating, close the gauge set valves and observe the low pressure gauge. If the pressure rises rapidly to zero, a large leak is indicated. Recheck the test fitting connections and gauge set connections before installing a new evaporator core or condenser core.
8. After evacuating for 45 minutes, close the gauge set valves and stop the vacuum pump. Observe the low pressure gauge; it should remain at the 101 kPa (30 in-Hg) mark. If the low pressure gauge reading rises 34 or more kPa (10 or more in-Hg) of vacuum from the 101 kPa (30 in-Hg) position in 10 minutes, a leak is indicated. If a very small leak is suspected, wait 30 minutes and observe the vacuum gauge. If a small amount of vacuum is lost, operate the vacuum pump with gauge valves open for an additional 30 minutes to remove any remaining refrigerant from the oil in the evaporator core or condenser core. Then recheck for loss of vacuum. If a very small leak is suspected, allow the system to sit overnight with vacuum applied and check for vacuum loss.
9. If the evaporator core or condenser core does leak, as verified by the above procedure, install a new evaporator core or condenser core.

A/C Compressor - External Leak Test

1. Install the A/C Pressure Test Adapter on the port of the A/C compressor, using the existing manifold retaining bolt.
2. Connect the high and low pressure lines of a manifold gauge set or a refrigerant recovery/recycling station such as the R-134a A/C service center to the corresponding fittings on the A/C Pressure Test Adapter.
3. Attach the center hose of a manifold gauge set to a refrigerant container standing in an upright position.
4. Hand-rotate the compressor shaft 10 complete revolutions to distribute the oil inside the A/C compressor.
5. Open the low pressure gauge valve, the high pressure gauge valve and the valve on the refrigerant container to allow the refrigerant vapor to flow into the A/C compressor.
6. Using the Refrigerant Leak Detector, check for leaks at the compressor shaft.
7. If a shaft seal leak is found, replace the compressor shaft seal. If an external leak is found, install a new A/C compressor.
8. When the leak test is complete, recover the refrigerant from the compressor.

Air Conditioning (A/C) System Check - Retail Procedure

Note. This Retail Procedure is not eligible for claims on Ford paid repairs (warranty and ESP).

Note. The engine should be run at idle for 10 minutes with the air conditioning on and set to MAX A/C (if equipped) or FULL COOL and RECIRC (if equipped) before carrying out this retail procedure.

Note. Read and follow all of the Warnings, Cautions and Notes at the beginning of this section before continuing.

Visual inspection

1. Open the hood and visually inspect the heating and air conditioning systems for the following: Coolant reservoir for correct coolant level Heater hoses for deterioration or loose connections Radiator and condenser for foreign material or damaged fins restricting airflow, loose mounting or connections Accessory drive belt(s) and cooling fan(s) for wear or physical damage Refrigerant lines and connections for physical damage or loose connections Compressor for physical damage or loose connections Suction accumulator (if equipped) or receiver/drier (if equipped) for physical damage or loose connections Wiring and connectors for excessive wear, loose or damaged connections, or incorrect routing
2. Carry out air conditioning refrigerant analysis. For additional information, refer to «REFRIGERANT IDENTIFICATION TESTING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . If the refrigerant fails the analysis, discontinue diagnosis and make recommendations for repairs. If the refrigerant passes the analysis, carry out the air conditioning system check.
3. Check the air conditioning system. Connect an R-134a manifold gauge set or refrigerant service center with gauges to the refrigerant system. With the vehicle in PARK, parking brake set, thermometer installed in center panel vent, and air conditioning system on and set to MAX A/C (if equipped) or FULL COOL and RECIRC (if equipped), start the engine. Record the air refrigerant system pressures while running the engine at 1,500 rpm and allow the engine to return to idle. Operate the blower motor in all control positions and check for correct blower speed changes. With the blower motor on MED HI, operate the air discharge mode selector in all positions and check for correct airflow in each position. Operate the temperature blend selector in all positions and check for correct change in discharge temperature. Check the air discharge temperature with the selector in the coolest position and the air conditioning on and set to MAX A/C (if equipped) or FULL COOL and RECIRC (if equipped) to determine if the air discharge temperature is acceptable for the current ambient air temperature. Carry out the ATC self-test (if applicable). If the refrigerant system pressures were low, carry out the refrigerant system leak test.
4. Use either an ultraviolet (UV) or an electronic leak detector to check for leaks at all refrigerant lines, connections, and components. After all tests have been completed, report all findings and recommended repairs to your service advisor before carrying out further diagnostic procedures.

Disconnect

1. Remove the nut and separate the 2 halves of the peanut fitting.
2. Remove the O-ring seal with a non-metallic tool.

Connect

1. Clean all dirt or foreign material from the fittings.
2. Install the O-ring seal.
3. Assemble the male and female fittings together.

Scheme 203

1. Check the A/C clutch air gap at 3 equally spaced places between the clutch plate and the A/C clutch pulley.
2. If the A/C clutch air gap is out of range, remove the clutch plate. Add or remove spacers between the clutch plate hub and the compressor shaft until the clearance is within specification.

SPECIAL TOOL(S) CHART R-134a Refrigerant Center 176-00002 or equivalent R-134a Refrigerant Center 023-00174 or equivalent R-134a Manifold Gauge Set 023-00047 or equivalent 120 Watt UV Spot Lamp 164-R0721 or equivalent High Intensity UV Lamp - 12 Volt 164-R6000 or equivalent R-134a Fluorescent Dye Injector 164-R0775 or equivalent Deluxe Injector Loop Kit 219-00069 or equivalent R-134a Leak Detection Dye 164-R6060

Scheme 204

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Fluorescent Dye Detection

Note. Ford Motor Company vehicles are produced with R-134a fluorescent dye installed in the refrigerant system from the factory. The location of leaks can be pinpointed by the bright yellow-green glow of the fluorescent dye under a UV lamp. Since more than one leak can exist, make sure to inspect each component, line and fitting in the refrigerant system for a leak.

Scheme 209

1. Check for leaks using a Rotunda-approved UV lamp. Inspect all components, lines and fittings of the refrigerant system.
2. If a leak is found, recover the refrigerant. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
3. Repair the refrigerant system leak(s).
4. Evacuate and charge the refrigerant system. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
5. After the leak(s) is/are repaired, remove any traces of fluorescent dye with a general purpose oil solvent.
6. Verify the repair by running the vehicle for a short period of time and rechecking the area of the leak with a Rotunda-approved UV lamp.

Fluorescent Dye Injection - Using an A/C Refrigerant Center and Dye Injector

Note. Fluorescent refrigerant system dye is added to the refrigerant system at the factory to assist in refrigerant system leak diagnosis using a Rotunda-approved ultraviolet blacklight. It is not necessary to add additional dye to the refrigerant system before diagnosing leaks, even if a significant amount of refrigerant has been removed from the system. Replacement suction accumulators and receiver/driers are shipped with a fluorescent dye "wafer" included in the desiccant bag which will dissolve after approximately 30 minutes of continued A/C operation. It is not necessary to add dye after flushing or filtering the refrigerant system because a new suction accumulator or receiver/drier is installed as part of the flushing or filtering procedure. Additional refrigerant system dye should only be added if more than 50% of the refrigerant system lubricant capacity has been lost due to a fitting separation, hose rupture or other damage.

Note. Before using the R-134a fluorescent dye injector for the first time, refer to the manufacturers instructions on evacuation of any non-condensable gasses from the hoses.

Note. Only connect the R-134a fluorescent dye injector to a manifold and gauge set or R-134a service center when fluorescent dye is to be injected. The R-134a fluorescent dye injector has a one way check valve that will prevent refrigerant system recovery and evacuation.

Note. Refrigerant system pressure should be between 413-551 kPa (60-80 psi) at 24°C (75°F) with the engine off.

Scheme 210

Scheme 211

1. Connect an R-134a A/C refrigerant service center or a manifold and gauge set to the refrigerant system service port valves.
2. Verify that the valves on the fluorescent dye injector are closed.
3. Fill the fluorescent dye injector reservoir with 7 ml (0.25 oz) of fluorescent dye.
4. Install the fluorescent dye injector between the low-pressure service gauge port valve and the R-134a refrigerant service center or manifold gauge set.
5. Open all valves and inject the fluorescent dye into the refrigerant system.
6. When fluorescent dye injection is complete, close all valves.
7. Recover the refrigerant from the R-134a fluorescent dye injector.
8. Remove the fluorescent dye injector from the low-pressure service gauge port valve and the R-134a A/C refrigerant service center or manifold gauge set.

Fluorescent Dye Injection - Using a Dye Injector Loop Kit

Note. Fluorescent refrigerant system dye is added to the refrigerant system at the factory to assist in refrigerant system leak diagnosis using a Rotunda-approved ultraviolet blacklight. It is not necessary to add additional dye to the refrigerant system before diagnosing leaks, even if a significant amount of refrigerant has been removed from the system. Replacement suction accumulators and receiver/driers are shipped with a fluorescent dye "wafer" included in the desiccant bag which will dissolve after approximately 30 minutes of continued A/C operation. It is not necessary to add dye after flushing or filtering the refrigerant system because a new suction accumulator or receiver/drier is installed as part of the flushing or filtering procedure. Additional refrigerant system dye should only be added if more than 50% of the refrigerant system lubricant capacity has been lost due to a fitting separation, hose rupture or other damage.

Note. Before using the R-134a fluorescent dye injector for the first time, refer to the equipment manufacturers instructions on evacuation of non-condensable gasses from the hoses.

Note. Refrigerant system pressure should be between 413-551 kPa (60-80 psi) at 24°C (75°F).

Scheme 212

Scheme 213

1. Verify that the valves on the deluxe injector loop kit are closed.
2. Fill the deluxe injector loop kit reservoir with 7 ml (0.25 oz) of fluorescent dye.
3. Install the deluxe injector loop kit between the high-pressure and low-pressure service gauge port valves.
4. Start the engine.
5. Open the high-pressure service valve.
6. Open the deluxe injector loop kit valves and inject the fluorescent dye into the refrigerant system.
7. Close the high-pressure service valve to allow the pressure inside the deluxe injector loop kit to equalize with the suction side of the refrigerant system.
8. Close the valves on the deluxe injector loop kit.
9. Disconnect the high-pressure and low-pressure service valves and remove the deluxe injector loop kit from the vehicle.

SPECIAL TOOL(S) CHART H10PM Refrigerant Leak Detector With Battery 216-00001 or equivalent

Leak Detection

Scheme 214

1. Leak test the refrigerant system using the leak detector. Follow the instructions included with the leak detector for handling and operation techniques.
2. If a leak is found, recover the refrigerant. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) . Repair the system. Test the system for normal operation.

SPECIAL TOOL(S) CHART A/C Flush and Purge Machine 219-00022 (part of 219-00023) or equivalent A/C Flush and Purge Fitting Kit 219-00024 (part of 219-00023) or equivalent

Scheme 215

Scheme 216

Material

MATERIAL SPECIFICATION CHART

System Flushing

Note. Prior to using the A/C Flush and Purge Machine 219-00022 for the first time, review the operating instructions.

Note. Only the A/C Flush and Purge Machine kit 219-00023, which includes A/C Flush and Purge Machine 219-00022, A/C Flush and Purge Fitting Kit 219-00024 and A/C Systems Flushing Solvent, is approved for use on Ford vehicles. No other flushing device or solvent is approved for flushing heat exchangers (A/C condenser, A/C evaporator). Use of any other flusher or solvent may cause damage to the A/C system and the flushing unit.

Note. Ford Motor Company has approved a procedure to provide technicians with a non-CFC method of flushing contaminated A/C system heat exchangers. The procedure allows the specific components to be cleaned and flushed while installed in their normal in-vehicle location. The types of contamination flushed include particle matter that results from A/C compressor or desiccant failure and gummy residue that can form when refrigerant oil is overheated during A/C compressor seizure. The flushing process is a 2-step procedure that involves the use of an A/C Flush and Purge Machine 219-00022 to: circulate the flushing solvent through the heat exchanger in the reverse direction of normal refrigerant flow (back-flushing). Particulate matter picked up during flushing is filtered from the returning solvent before the solvent is returned to the reservoir for continued circulation. remove the flushing solvent from the heat exchanger. In this step of the procedure, pressurized air 621-862 kPa (90-125 psi) is used to push and evaporate any remaining flush solvent from the heat exchanger.

1. Recover the refrigerant. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
3. Connect the A/C flush and purge machine fitting kit and the A/C flush and purge machine to the heat exchanger to be flushed. Do not flush through the evaporator core orifice (if equipped), TXV (if equipped), or hoses with mufflers. Internal plumbing and material make-up of these components make it impossible to correctly remove foreign material or residual flushing solvent.
4. Flush the heat exchanger for a minimum of 15 minutes.
5. Apply 621-862 kPa (90-125 psi) pressurized auto the component for a minimum of 30 minutes. The 30-minute purge time is required to force and evaporate all residual solvent from the A/C system component. Failure to successfully remove all residual solvent within the component can result in system damage when reconnected and operated. Dispose of the used flush solvent and filter in accordance with local, state and federal regulations.
6. Install a new A/C evaporator core orifice (if equipped) and/or TXV (if equipped) in any vehicle being serviced for an internal A/C compressor or desiccant failure.
7. Install new refrigerant hoses with mufflers if clogged with foreign material.
8. Install a new suction accumulator (if equipped) or receiver/drier (if equipped) in any vehicle being serviced for an internal A/C compressor or desiccant failure.
9. Reconnect the heat exchanger being serviced.
10. If a new A/C compressor is not to be installed, lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «REFRIGERANT OIL ADDING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__refrigerant-oil-adding) .
11. If a new A/C compressor is not to be installed, evacuate, leak test and charge the A/C system. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .

SPECIAL TOOL(S) CHART R-134a Refrigerant Center 176-00002 or equivalent R-134a Refrigerant Center 023-00174 or equivalent R-134a Manifold Gauge Set 023-00047 or equivalent 1.2 CFM Vacuum Pump 023-00162 or equivalent 4.0 CFM Vacuum Pump 023-00163 or equivalent Automatic Refrigerant Charging Meter 023-00155 or equivalent

Scheme 217

Scheme 218

Scheme 219

MATERIAL SPECIFICATION CHART

Refrigerant System Recovery

Note. Ford Motor Company recommends use of an A/C service center to carry out recovery, evacuation and charging of the refrigerant system. If an A/C service center is not available, refrigerant system recovery, evacuation and charging may be accomplished using a separate recovery station, vacuum pump, charging meter and manifold gauge set.

Note. Leaks in refrigerant system service equipment, hoses or gauges can cause a leak in vacuum that may be misinterpreted as a problem with the vehicle's refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

1. Prior to recovering, you must verify the purity of the refrigerant. For additional information, refer to «REFRIGERANT IDENTIFICATION TESTING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. Connect an R-134a refrigerant service center to the low- and high-pressure service gauge port valves following the operating instructions provided by the equipment manufacturer.
3. Recover the refrigerant from the system following the operating instructions provided by the equipment manufacturer.
4. Once the refrigerant service center has recovered the refrigerant, switch OFF the power supply.
5. Allow the system to set for about 2 minutes, and observe the system vacuum reading. If the vacuum is not lost, disconnect the recovery equipment.
6. If the system does lose vacuum, repeat Steps 3 through 5 until the vacuum level remains stable for 2 minutes.
7. Carry out the required repairs.

Refrigerant System Evacuation Using an R-134a Service Center

Note. Ford Motor Company recommends use of an A/C service center to carry out recovery, evacuation and charging of the refrigerant system. If an A/C service center is not available, refrigerant system recovery, evacuation and charging may be accomplished using a separate recovery station, vacuum pump, charging meter and manifold gauge set.

Note. Leaks in refrigerant system service equipment, hoses or gauges can cause a leak in vacuum that may be misinterpreted as a problem with the vehicle's refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

1. Connect an R-134a service center to the low-and high-pressure service gauge port valves following the operating instructions provided by the equipment manufacturer.
2. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) of vacuum and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for a minimum of 45 minutes.
3. Turn OFF the vacuum pump. Observe the low-pressure gauge for 5 minutes to make sure that the system vacuum is held. If vacuum is not held for 5 minutes, leak test the system, repair the leak and evacuate the system again.

Refrigerant System Evacuation Using an R-134a Manifold Gauge Set

Note. Ford Motor Company recommends use of an A/C service center to carry out recovery, evacuation and charging of the refrigerant system. If an A/C service center is not available, refrigerant system recovery, evacuation and charging may be accomplished using a separate recovery station, vacuum pump, charging meter and manifold gauge set.

Note. Leaks in refrigerant system service equipment, hoses or gauges can cause a leak in vacuum that may be misinterpreted as a problem with the vehicle's refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

1. Connect the R-134a manifold gauge set to the low-side and high-side service gauge port valves.
2. Connect the center (yellow) hose from the manifold gauge set to the suction port on the vacuum pump.
3. Open all valves on the R-134a manifold gauge set and both service gauge port valves.
4. Turn on the vacuum pump and evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) of vacuum and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for a minimum of 45 minutes.
5. Close the high-side and low-side valves on the manifold gauge set (not the service gauge port valves) and turn OFF the vacuum pump.
6. Observe the low-pressure gauge for 5 minutes to make sure that the system vacuum is held. If vacuum is not held for 5 minutes, leak test the system, repair the leak and evacuate the system again.

Refrigerant System Charging Using an R-134a Service Center

Note. Ford Motor Company recommends use of an A/C service center to carry out recovery, evacuation and charging of the refrigerant system. If an A/C service center is not available, refrigerant system recovery, evacuation and charging may be accomplished using a separate recovery station, vacuum pump, charging meter and manifold gauge set.

Note. Leaks in refrigerant system service equipment, hoses or gauges can cause a leak that may be misinterpreted as a problem with the vehicle's refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

1. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «REFRIGERANT OIL ADDING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__refrigerant-oil-adding) .
2. Connect an R-134a A/C service center to the low-side and high-side service gauge port valves following the operating instructions provided by the equipment manufacturer.
3. Set the refrigerant charge amount, and charge the refrigerant system following the instructions provided by the equipment manufacturer.

Refrigerant System Charging

Note. Ford Motor Company recommends use of an A/C service center to carry out recovery, evacuation and charging of the refrigerant system. If an A/C service center is not available, refrigerant system recovery, evacuation and charging may be accomplished using a separate recovery station, vacuum pump, charging meter and manifold gauge set.

Note. Leaks in refrigerant system service equipment, hoses or gauges can cause a leak that may be misinterpreted as a problem with the vehicle's refrigerant system. It is necessary to leak-test all refrigerant system service equipment, hoses and gauges on a weekly basis to verify that no leaks are present.

1. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «REFRIGERANT OIL ADDING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information__refrigerant-oil-adding) .
2. Assemble the R-134a manifold gauge set, automatic refrigerant charging meter and R-134a supply tank following the automatic refrigerant charging meter operating instructions.
3. Charge the refrigerant system following the automatic refrigerant charging meter operating instructions.
4. If the refrigerant flow stops before the refrigerant charge is complete, start the engine, select A/C operation and allow the refrigerant charge to complete.

SPECIAL TOOL(S) CHART Dye/Lubricant Injector 164-R0775 Add-On Module Kit 219-00069

MATERIAL SPECIFICATION CHART

Refrigerant Oil Adding

1. Refer to the chart below for refrigerant oil adding amounts and methods of installation. REFRIGERANT OIL ADDING AMOUNTS AND METHODS Component PAG Oil Amount Method of Adding A/C Compressor See heading below Add directly to A/C compressor before installation. Suction Accumulator or Receiver/Drier See heading below Add directly to suction accumulator inlet port or inject to low-side service port during system charging. Evaporator Core 45 ml (1.5 fl oz.) added to the amount collected during refrigerant recovery Add directly to evaporator core inlet tube or inject to low-side service port during system charging. Condenser Core 60 ml (2 fl oz.) added to the amount collected during refrigerant recovery Add directly to condenser core inlet or inject to low-side service port during system charging. Evaporator Core Orifice or Thermostatic Expansion Valve The amount collected during refrigerant recovery Inject to low-side service port during system charging. A/C Pressure Relief Valve 60 ml (2 fl oz.) added to the amount collected during refrigerant recovery Inject to low-side service port during system charging. Refrigerant Hose/Line 60 ml (2 fl oz.) added to the amount collected during refrigerant recovery (1) Inject to low-side service port during system charging. O-ring Leak Repair 60 ml (2 fl oz.) added to the amount collected during refrigerant recovery (2) Inject to low-side service port during system charging. Service Port Leak Repair 60 ml (2 fl oz.) added to the amount collected during refrigerant recovery Inject to low-side service port during system charging. (1) If an excessive amount of refrigerant oil is lost due to a hose rupture/separation or other damage, the total system refrigerant oil capacity must be added. (2) The amount specified may be used for one or multiple O-ring leak repairs. Do not multiply the refrigerant oil amount by the number of O-ring leaks being repaired.

Refrigerant Oil Adding for New A/C Compressor Installation

Note. Service A/C compressors are shipped without refrigerant oil.

1. Rotate the old A/C compressor shaft 8 to 10 full rotations (clockwise) while collecting the refrigerant oil in a clean measuring cup. Add the same amount plus the amount collected during refrigerant recovery.

Refrigerant Oil Adding for New Suction Accumulator or Receiver/Drier Installation

1. Drill one 12.7 mm (1/2 inch) hole in the old suction accumulator or receiver/drier cylinder and drain the oil into a clean measuring cup.
2. Add the quantity of oil drained, plus the amount collected during refrigerant recovery and 60 ml (2 fl oz).

Oil Injection Using a Dye/Lubricant Injector

Note. If fluorescent leak detection dye is also to be added during A/C charging, the dye may be added to the dye/lubricant injector along with the refrigerant oil.

1. Evacuate the refrigerant system. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .
2. Assemble the dye/lubricant injector using the correct adapters to match the amount of refrigerant compressor oil to be injected.
3. Verify that all the valves on the dye/lubricant injector are closed.
4. Fill the dye/lubricant injector with the correct amount of clean, new PAG oil.
5. Install the dye/lubricant injector between the low-side service gauge port valve and the refrigerant service station or manifold gauge set.
6. Open all valves and charge the refrigerant system. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/five-hundred/i-2004-2007/remont/automatic-hvac-system/#hvac-control-system-general-information) .

SPECIAL TOOL(S) CHART Refrigerant Identifier with Air-Radiator 198-00003 or equivalent

Scheme 220

Refrigerant Identification

1. Follow the instructions included with the refrigerant identifier to obtain the sample for testing.
2. The scan tool will display one of the following: If the purity level of R-134a is 98% or greater by weight, the green "PASS" light emitting diode (LED) will light. The weight concentrations of R-134a, R-12, R-22, hydrocarbons and air will be displayed on the digital display. If refrigerant R-134a does not meet the 98% purity level, the red "FAIL" LED will light and an alarm will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22 and hydrocarbons will be displayed on the digital display. If hydrocarbon concentrations are 2% or greater by weight, the red "FAIL" LED will light, "Hydrocarbon High" will be displayed on the digital display, and an alarm will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22 and hydrocarbons will also be displayed on the digital display.
3. The percentage of air contained in the sample will be displayed if the R-134a content is 98% or greater. The scan tool eliminates the effect of air when determining the refrigerant sample content because air is not considered a contaminant, although air can affect A/C system performance. When the scan tool has determined that a refrigerant source is pure (R-134a is 98% or greater by weight) and air concentration levels are 2% or greater by weight, the scan tool will prompt the user if an air purge is desired.
4. If contaminated refrigerant is detected, repeat the refrigerant identification test to verify that the refrigerant is indeed contaminated.

Contaminated Refrigerant Handling

Note. A new suction accumulator or receiver/drier must be installed as directed by the air conditioning system flushing procedure.

1. Recover the contaminated refrigerant using suitable recovery-only equipment designed for capturing and storing contaminated refrigerant only. If this equipment is not available, contact an A/C service facility in your area with the correct equipment to carry out this service.
2. Determine and correct the cause of the customers initial concern.
3. Flush the air conditioning system.
4. Dispose of the contaminated refrigerant in accordance with all federal, state and local regulations.

SPECIAL TOOL(S) CHART Flexible Applicator Tool Kit 258-00004 30 oz Sure Shot Pressure Sprayer 167-R4700 or equivalent

Scheme 221

MATERIAL SPECIFICATION CHART

A/C Odor Treatment

Note. There are typically 4 types of objectionable odors found in a vehicle: Chemical odors Environmental odors Human and other interior-generated odors Microbiological odors

Before determining that A/C order treatment is required, the source and the circumstances under which the odor occurs must be determined.

Note. Chemical odors are usually constant regardless of the climate control system setting although they may be enhanced by A/C operation. Most chemical odors are caused by fluid leaks or incorrectly cured adhesives. Chemical odors can be eliminated by repairing the leaking component and removing any residue.

Note. Environmental odors usually occur for a short time and diminish after the vehicle passes through the affected area. These odors are typically only detected when the vehicle windows are open, or when the climate control system is operating in a mode that allows for fresh air. Environmental odors cannot be eliminated because they are external in source, but they may be minimized by switching to a climate control setting that uses recirculated air.

Note. Human and other interior-generated odors occur while the source is present and may linger for a short time after. These odors may be more noticeable during A/C operation. Human odors may be eliminated by removing the source and cleaning the affected area.

Note. Microbiological odors, if in the A/C system, usually last for about 30 seconds after the system is turned on. They will be detected while the A/C is turned on and using either outside or recirculated air. Microbiological odors that occur in areas other than the A/C system (for example, water in doors or wet carpeting) may last indefinitely and will be more intense when recirculated air is used. Microbiological odors will not be present at temperatures at or below 10°C (50°F).

Microbiological odors can be eliminated by removing the source and treating the affected area. Standing water must be allowed to drain and dry out. A/C systems may be treated by using A/C cooling coil coating as described in the service procedure below.

Microbiological odors result from microbial growth supported by warm temperatures and moisture. Microbiological odors are described as musty/mildew type smells and may occur on/in

1. foam seals.
2. rubber seals.
3. adhesives.
4. standing water.
5. water soaked carpet/trim.

See also:
• GLASS, FRAMES AND MECHANISMS
• SEATING
• AIR DISTRIBUTION & FILTERING
• INSTRUMENT CLUSTER AND PANEL ILLUMINATION
• MODULE COMMUNICATIONS NETWORK
• ENGINE COOLING
• INTRODUCTION - GASOLINE
• POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX
• SYMPTOM CHART
• PINPOINT TEST E
• ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE - Retrieve Continuous DTCs
• Electronic Automatic Temperature Control Module On-Demand Self Test
• REFRIGERANT OIL ADDING