HVAC Control System - General Information and Diagnostics Ford Taurus X I

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

a Manifold gauge set pressures may vary slightly depending on the distance between the service gauge port valve and the A/C pressure relief valve, the A/C cycling switch or the pressure cutoff switch location.

Material

Material

Climate Control System

Note. To avoid damaging the vehicle or air conditioning (A/C) components, the following precautions must be observed. The A/C refrigerant of all vehicles must be identified and analyzed prior to refrigerant charging. Failure to do so can contaminate the shop bulk refrigerant and other vehicles. Do not add R-12 refrigerant to an A/C system that requires the use of R-134a refrigerant. These 2 types of refrigerant must never be mixed. Doing so can damage the A/C system. Charge the A/C system with R-134a refrigerant gas while the engine is running only at the low-pressure side to prevent refrigerant slugging from damaging the A/C compressor. Use only R-134a refrigerant. Due to environmental concerns, when the A/C system is drained, the refrigerant must be collected using refrigerant recovery/recycling equipment. Federal, State/Provincial and/or local laws REQUIRE that R-134a be recovered into appropriate recovery equipment and the process be conducted by qualified technicians who have been certified by an approved organization, such as Automotive Service Excellence (ASE), Mobile Air Conditioning Society (MACS), etc. Use of a recovery machine dedicated to R-134a is necessary to reduce the possibility of oil and refrigerant incompatibility concerns. Refer to the instructions provided by the equipment manufacturer when removing refrigerant from or charging the A/C system. Refrigerant R-134a must not be mixed with air for leak testing or used with air for any other purpose above atmospheric pressure. R-134a is combustible when mixed with high concentrations of air and higher pressures. A number of manufacturers are producing refrigerant products that are described as direct substitutes for refrigerant R-134a. The use of any unauthorized substitute refrigerant can severely damage the A/C components. If repair is required, use only new or recycled refrigerant R-134a.

Note. To avoid contamination of the air conditioning (A/C) system, the following precautions must be observed. Never open or loosen a connection before recovering the refrigerant. When loosening a connection, if any residual pressure is evident, allow it to leak out before opening the fitting. Evacuate a system that has been opened to install a new component or one that has discharged through leakage before charging. Seal open fittings with a cap or plug immediately after disconnecting a component from the system. Clean the outside of the fittings thoroughly before disconnecting a component from the system. Do not remove the sealing caps from a new component until ready to install. Refrigerant oil will absorb moisture from the atmosphere if left uncapped. Do not open an oil container until ready to use and install the cap immediately after using. Store the oil in a clean, moisture-free container. Install a new O-ring seal before connecting an open fitting. Coat the fitting and O-ring seal with mineral oil before connecting. When installing a refrigerant line, avoid sharp bends. Position the line away from the exhaust or any sharp edges that can chafe the line. Tighten threaded fittings only to specifications. The steel and aluminum fittings used in the refrigerant system will not tolerate overtightening. When disconnecting a fitting, use a wrench on both halves of the fitting to prevent twisting of the refrigerant lines or tubes. Do not open a refrigerant system or uncap a new component unless it is as close as possible to room temperature. This will prevent condensation from forming inside a component that is cooler than the surrounding air.

The Electronic Manual Temperature Control (EMTC) system heats or cools the vehicle depending on the HVAC module - EMTC control panel selection.

1. The HVAC module - 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.

The Dual Automatic Temperature Control (DATC) 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.

The system consists of the following components

1. A/C compressor
2. A/C compressor clutch assembly
3. A/C condenser core
4. A/C evaporator core
5. Receiver/drier
6. Connecting refrigerant lines
7. Thermostatic Expansion Valve (TXV)
8. A/C pressure transducer
9. Heater core and evaporator core housing
10. HVAC module - EMTC
11. HVAC module - DATC
12. Blower switch (EMTC systems)
13. Temperature blend door actuators
14. Floor/defrost/panel door actuator
15. Air inlet door actuator
16. Blower motor resistor or speed control module
17. Blower motor
18. Ambient temperature sensor
19. In-vehicle temperature sensor
20. Solar radiation sensor
21. Evaporator discharge air temperature sensor

Electronic Manual Temperature Control (EMTC) System

The EMTC system heats or cools the vehicle depending on the EMTC control panel selection.

1. The HVAC module - 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.

The EMTC system operation is determined by the settings on the climate control module. To control the various functions, the EMTC system is composed of the following

1. HVAC module - EMTC
2. Blower motor resistor
3. Mode door actuator
4. Air inlet door actuator
5. Temperature blend door actuator

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 button

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 HVAC module - EMTC.

The function selector

1. selects airflow direction.
2. is serviced only with the HVAC module - EMTC.

The temperature selector

1. selects full warm and full cool as well as blended outlet temperatures.

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 HVAC module - EMTC.

The EMTC module also includes

1. a rear window defrost button. Refer to «GLASS, FRAMES AND MECHANISMS»(/ford/taurus-x/i-2007-2009/remont/heated-glassdefoggers/#windows-and-glass) article.

Dual Automatic Temperature Control (DATC) System

The DATC 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 desired air temperature.
4. The blower motor control override button varies the blower motor speed.
5. The driver side and passenger side temperature settings can be individually controlled.

The DATC system operation is determined by the settings on the HVAC module - DATC. The DATC system automatically maintains a selected temperature for vehicle interior comfort. To control the various functions, the DATC system is composed of the following

1. HVAC module - DATC
2. Blower motor speed control
3. Mode door actuator
4. Air inlet door actuator
5. Driver and passenger temperature blend door actuators
6. In-vehicle temperature sensor
7. Ambient temperature sensor
8. Solar radiation sensor
9. Evaporator temperature sensor

When the HVAC module - DATC 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 HVAC module - DATC 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.

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

The HVAC module - DATC also includes

1. a rear window DEFROST button. Refer to «GLASS, FRAMES AND MECHANISMS»(/ford/taurus-x/i-2007-2009/remont/heated-glassdefoggers/#windows-and-glass) article.
2. heated seat controls. Refer to «SEATING»(/ford/taurus-x/i-2007-2009/remont/seats/#seat-system) article.

External Temperature Display

The external temperature is displayed when the EXT button is pressed. While the actual external temperature can vary continuously, the value that is displayed will update at a specific rate depending on whether or not the engine is "hot" and whether or not the vehicle is moving.

When the external temperature is rising, the display will update slowly.

Updates (when the actual external temperature is higher than currently displayed value) will be limited to 0.6°C (1°F) every 20 seconds while the vehicle is moving at greater than 40 km/h (25 mph) for more than 90 seconds or 0.6°C (1°F) every 20 minutes if the vehicle is not moving at this speed. This is to prevent the heat from the engine compartment from affecting the accuracy of the display.

When the external temperature is dropping, the display will update quickly.

Updates (when the actual external temperature is lower than currently displayed value) will only be limited to 0.6°C (1°F) every 2 seconds (regardless of vehicle speed). Consequently the display will essentially follow the drop experienced by the external temperature thermistor.

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 HVAC module - EMTC or HVAC module - DATC 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 HVAC module - EMTC or HVAC module - DATC. 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 HVAC module - EMTC or HVAC module - DATC (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 HVAC module - DATC, based on the temperature setting.
3. the mode door actuators are automatically controlled by the HVAC module - DATC, based on the temperature setting.
4. the A/C compressor is automatically controlled by the HVAC module - DATC, 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 HVAC module - DATC, 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.

Special Tools Illustration Tool Name Tool Number A/C Flush Adapter Kit 219-00074 or equivalent Flex Probe Kit 105-R025B or equivalent Fluke 77 III Automotive Meter 105-R0056 or equivalent Pressure Test Kit 014-R1072 or equivalent R-134a Manifold Gauge Set 176-R032A or equivalent Refrigerant Leak Detector 216-00001 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Scheme 1

Scheme 2

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 occupants 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 (CASS)

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. The ignition is off for more than 8 hours
2. The 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 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 system settings.

The Refrigerant Cycle

During stabilized conditions (A/C 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 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 relief valve will open and vent refrigerant to relieve unusually high system pressure.

Scheme 3

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 Battery Junction Box (BJB) fuse(s): 24 (10A) 31 (30A) 35 (40A) Smart Junction Box (SJB) fuse(s): 15 (10A) 37 (10A) 45 (5A) Blower motor inoperative A/C compressor inoperative Circuitry open/shorted Disconnected electrical connectors Cooling fan inoperative
3. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
5. If the scan tool does not communicate with the VCM: check the VCM connection to the vehicle. check the scan tool connection to the VCM. refer to «MODULE COMMUNICATIONS NETWORK»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system) article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. refer to «MODULE COMMUNICATIONS NETWORK»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system) article to diagnose no response from the PCM, HVAC module - Electronic Manual Temperature Control (EMTC) or HVAC module - Dual Automatic Temperature Control (DATC).
7. Carry out the network test. If the scan tool responds with no communication from one or more modules, refer to «MODULE COMMUNICATIONS NETWORK»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system) article. If the network test passes, retrieve and record the continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics from the PCM, HVAC module - EMTC or HVAC module - DATC.
9. If the HVAC DTCs retrieved are related to the concern, go to the «HVAC Module DTC Table»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__hvac-module-dtc-table) . If the PCM DTCs retrieved are related to the concern, go to the «PCM DTC Table»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pcm-dtc-table) . For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article.
10. If no DTCs related to the concern are retrieved, go to «Symptom Chart - Climate Control Systems»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) or Go to «Symptom Chart - NVH»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) .

Alternate Diagnostic Methods - HVAC Module - Dual Automatic Temperature Control (DATC) Only

The DATC 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 scan tool. If using a scan tool, refer to the scan tool operating manual.

On-demand DTCs can also be retrieved by carrying out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. To retrieve and/or clear continuous DTCs, carry out the HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs procedure. Always retrieve both on-demand and continuous DTCs before proceeding with diagnosis and/or repair.

If no DTCs are present, go to Symptom Chart - Climate Control Systems or Go to Symptom Chart - NVH for the appropriate diagnostic action.

HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test

The HVAC Module - Dual Automatic Temperature Control (DATC) 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 HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the HVAC Module - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.

1. The HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A scan tool must be used to retrieve these concerns.
2. The HVAC Module - Dual Automatic Temperature Control (DATC) 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 HVAC module - DATC 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 «HVAC Module DTC Table»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__hvac-module-dtc-table) 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 - Climate Control Systems»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) .
7. To exit the self-test and retain all DTCs, press any button except DEFROST. The HVAC module - DATC will exit the self-test and retain all DTCs.
8. 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.
9. Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.
10. If a condition exists, but no on-demand DTCs appear during the self-test, carry out the HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs self test.

HVAC Module - Dual Automatic Temperature Control (DATC) - Retrieve Continuous DTCs

The HVAC module - DATC 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 Celsius symbol (°C) on the HVAC module - DATC display. Record all DTCs displayed.
3. If any DTCs appear, carry out the diagnostic procedure. Refer to the «HVAC Module DTC Table»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__hvac-module-dtc-table) and follow the ACTION for each DTC given.
4. If a condition exists but no DTCs appear, go to «Symptom Chart - Climate Control Systems»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) .
5. To exit and retain all continuous DTCs, press any button except DEFROST. The HVAC module - DATC will exit and retain all continuous DTCs.
6. To exit and clear all continuous DTCs, press the DEFROST button. The HVAC module - DATC will exit 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.

HVAC Module Cold Boot Process

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

1. Turn the ignition switch to the OFF position.
2. Disconnect the HVAC module electrical connectors.
3. Inspect the module connectors for: corrosion. pushed-out pins. incorrectly seated connector.
4. Wait one minute.
5. Connect the HVAC module electrical connectors.
6. Turn the ignition switch to the ON position.
7. Select any position except OFF on the HVAC module.

PCM DTC Table

a PCM DTC P1464 will set if the function selector is in PANEL with A/C button pressed, DEFROST or MAX A/C mode when the on-demand self test is being run.

HVAC Module DTC Table

Note. Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the Introduction - Gasoline Engines article.

HVAC MODULE DTC TABLE

Symptom Chart - Climate Control Systems

Note. Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to Introduction - Gasoline Engines article.

Symptom Chart - Climate Control Systems

Symptom Chart - NVH

Note. NVH symptoms will be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, refer to NOISE, VIBRATION AND HARSHNESS article. Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, refer back to NOISE, VIBRATION AND HARSHNESS article for the next likely system and continue diagnosis.

Symptom Chart - NVH

Pinpoint Tests

Note. 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.

Pinpoint Test A: DTC P0532 or P0533

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Electronic Engine Controls - 3.5L for schematic and connector information.

Normal Operation

Under normal operation, the A/C pressure transducer receives a ground from the PCM through circuit RE407 (YE/VT). A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM through circuit LE424 (YE/GN). The A/C pressure transducer sends a voltage to the PCM through circuit VH433 (VT/OG) to indicate the A/C pressure.

1. DTC P0532 A/C Pressure Refrigerant Sensor A Circuit Low - The A/C pressure transducer inputs a voltage to the PCM. If the voltage is below the calibrated level this DTC sets.
2. DTC P0533 A/C Pressure Refrigerant Sensor A Circuit High - The A/C pressure transducer inputs a voltage to the PCM. If the voltage is above the calibrated level this DTC sets.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. A/C pressure transducer
3. PCM

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.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. A1 CHECK THE PCM OUTPUT VOLTAGE Key in OFF position. Disconnect: A/C Pressure Transducer C1260 Key in ON position. Measure the voltage between ground and A/C pressure transducer C2160-2, circuit LE424 (YE/GN), harness side. Is the voltage between 4.7 and 5.1 volts? YES : Go to A2 . NO : REPAIR circuit LE424 (YE/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. A2 CHECK THE PCM SENSOR GROUND Measure the voltage between A/C pressure transducer C2160-1, circuit RE407 (YE/VT), harness side and A/C pressure transducer C2160-2, circuit LE424 (YE/GN), harness side. Is the voltage between 4.7 and 5.1 volts? YES : If diagnosing DTC P0532 , go to A3 . If diagnosing DTC P0533 , go to A5 . NO : REPAIR circuit RE407 (YE/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. A3 CHECK THE A/C PRESSURE TRANSDUCER HIGH Enter the following diagnostic mode on the diagnostic tool: A/C Pressure (ACP_PRESS) PCM PID While observing the ACP_PRESS PCM PID, connect a fused jumper between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C2160-2, circuit LE424 (YE/GN), harness side. Does the ACP_PRESS PCM PID voltage read greater than 4 volts? YES : INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to A4 .
4. A4 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO GROUND Key in OFF position. Disconnect: PCM C175b Measure the resistance between ground and A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side. Is the resistance greater than 10,000 ohms? YES : Go to A7 . NO : REPAIR circuit VH433 (VT/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. A5 CHECK THE A/C PRESSURE TRANSDUCER HIGH Enter the following diagnostic mode on the diagnostic tool: A/C Pressure (ACP_PRESS) PCM PID While observing the ACP_PRESS PCM PID, connect a fused jumper between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C2160-1, circuit RE407 (YE/VT), harness side. Does the ACP_PRESS PCM PID voltage read less than 4.9 volts? YES : INSTALL a new A/C pressure transducer. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to A6 .
6. A6 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: PCM C175b Key in ON position. Measure the voltage between ground and A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side. Is any voltage present? YES : REPAIR circuit VH433 (VT/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to A7 .
7. A7 CHECK CIRCUIT VH433 (VT/OG) FOR A SHORT TO CIRCUIT LE424 (YE/GN) OR RE407 (YE/VT) Key in OFF position. NOTE: For DTC P0532 only. Measure the resistance between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C2160-1, circuit RE407 (YE/VT), harness side. NOTE: For DTC P0533 only. Measure the resistance between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and A/C pressure transducer C2160-2, circuit LE424 (YE/GN), harness side. Is the resistance greater than 10,000 ohms? YES : Go to A8 . NO : REPAIR circuit VH433 (VT/OG) for a short to circuit LE424 (YE/GN) or RE407 (YE/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
8. A8 CHECK CIRCUIT VH433 (VT/OG) FOR AN OPEN Measure the resistance between A/C pressure transducer C2160-3, circuit VH433 (VT/OG), harness side and PCM C175b-37, circuit VH433 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to A9 . NO : REPAIR circuit VH433 (VT/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
9. A9 CHECK THE PCM MODULE CONNECTION Clear the DTCs. Disconnect all the PCM connectors. Check for: corrosion. pushed-out pins. incorrectly seated connector. Connect and correctly seat all the PCM connectors. Operate the system. Does the concern return? YES : INSTALL a new PCM. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test B: DTC P0645

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, voltage is provided to the A/C clutch relay coil through circuit CBP46 (WH/BU). When A/C is requested, and A/C line pressures allow, a ground is provided to the A/C clutch relay coil from the PCM through circuit CH302 (WH/BN), energizing the A/C clutch relay.

1. DTC P0645 - A/C Clutch Relay Control Circuit - The DTC sets when the PCM grounds the relay circuit, excessive current draw is detected on the relay circuit or, with the relay circuit not grounded by the PCM, voltage is not detected on the relay circuit the PCM expects to detect voltage coming through the relay coil to the relay circuit.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. A/C clutch relay
3. PCM

Scheme 13

Scheme 14

Scheme 15

Scheme 16

1. B1 CHECK THE VOLTAGE TO THE A/C CLUTCH RELAY Key in OFF position. Disconnect: A/C Clutch Relay Key in ON position. Measure the voltage between ground and the A/C clutch relay socket, circuit CBP46 (WH/BU). Is the voltage greater than 10 volts? YES : CARRY OUT the A/C clutch relay component test. Refer to appropriate COMPONENT TESTING article article. If the relay tests OK, go to B2 . NO : REPAIR circuit CBP46 (WH/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. B2 CHECK CIRCUIT CH302 (WH/BN) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: PCM C175b Key in ON position. Measure the voltage between ground and PCM C175b-18, circuit CH302 (WH/BN), harness side. Is any voltage present? YES : REPAIR circuit CH302 (WH/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to B3 .
3. B3 CHECK CIRCUIT CH302 (WH/BN) FOR A SHORT TO GROUND Key in OFF position. Measure the resistance between ground and PCM C175b-18, circuit CH302 (WH/BN), harness side. Is the resistance greater than 10,000 ohms? YES : Go to B4 . NO : REPAIR circuit CH302 (WH/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. B4 CHECK CIRCUIT CH302 (WH/BN) FOR AN OPEN Measure the resistance between A/C clutch relay socket, circuit CH302 (WH/BN) and PCM C175b-18, circuit CH302 (WH/BN), harness side. Is the resistance less than 5 ohms? YES : Go to B5 . NO : REPAIR circuit 321 (GY/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. B5 CHECK THE PCM MODULE CONNECTION Clear the DTCs. Disconnect all the PCM connectors. Check for: corrosion. pushed-out pins. incorrectly seated connector. Connect and correctly seat all the PCM connectors. Operate the system. Does the concern return? YES : INSTALL a new PCM. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test C: DTC B1251 or B1253

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, the in-vehicle air temperature sensor receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the in-vehicle air temperature sensor from the HVAC module - DATC through circuit VH414 (GN/BU).

1. DTC B1251 Air Temperature Internal Sensor Circuit Open - The module senses no voltage drop on the sensor reference voltage circuit, indicating an open circuit.
2. DTC B1253 Air Temperature Internal Sensor Circuit Short to Ground - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. In-vehicle air temperature sensor
3. HVAC module - DATC

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

1. C1 CHECK THE SENSOR RESISTANCE Key in OFF position. Disconnect: In-Vehicle Temperature Sensor C233 Measure the resistance between the in-vehicle temperature sensor C233 terminals and compare to the table below. Ambient Temperature Resistance -40°C (-40°F) 848,200-966,200 ohms -15°C (5°F) 199,600-217,100 ohms 0°C (32°F) 92,630-98,350 ohms 15°C (59°F) 45,820-47,600 ohms 25°C (77°F) 29,640-30,360 ohms 35°C (95°F) 19,330-20,100 ohms 60°C (140°F) 7,316-7,846 ohms 85°C (185°F) 3,117-3,429 ohms Is the resistance within the specified values for the temperatures? YES : Go to C2 . NO : INSTALL a new in-vehicle temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. C2 CHECK THE SENSOR OUTPUT VOLTAGE Key in ON position. Press the AUTO button. Measure the voltage between in-vehicle temperature sensor C233-1, circuit VH414 (GN/BU), harness side and C233-2, circuit RH111 (GY/BU), harness side. Is the voltage between 4.7 and 5.1 volts? YES : INSTALL a new in-vehicle sensor. CLEAR the DTCs. REPEAT the self-test. If code returns, go to C7 . NO : If diagnosing DTC B1251 , go to C3 . If diagnosing DTC B1253 , go to C5 .
3. C3 CHECK CIRCUIT VH414 (GN/BU) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228a Measure the resistance between HVAC module - DATC C228a-3, circuit VH414 (GN/BU), harness side and in-vehicle temperature sensor C233-1, circuit VH414 (GN/BU), harness side. Is the resistance less than 5 ohms? YES : Go to C4 . NO : REPAIR circuit VH414 (GN/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. C4 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and in-vehicle temperature sensor C233-2, circuit RH111 (GY/BU), harness side. Is the resistance less than 5 ohms? YES : Go to C7 . NO : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. C5 CHECK CIRCUIT VH414 (GN/BU) FOR A SHORT TO CIRCUIT RH111 (GY/BU) Key in OFF position. Disconnect: HVAC Module - DATC C228b Measure the resistance between in-vehicle temperature sensor C233-1, circuit VH414 (GN/BU), harness side and C233-2, circuit RH111 (GY/BU), harness side. Is the resistance greater than 10,000 ohms? YES : Go to C6 . NO : REPAIR circuit VH414 (GN/BU) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
6. C6 CHECK CIRCUIT VH414 (GN/BU) FOR A SHORT TO GROUND Measure the resistance between HVAC module - DATC C228a-3, circuit VH414 (GN/BU), harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to C7 . NO : REPAIR circuit VH414 (GN/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
7. C7 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test D: DTC B1255 or B1257

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, the ambient air temperature sensor receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the ambient air temperature sensor from the HVAC module - DATC through circuit VH407 (YE/GN).

1. DTC B1255 Air Temperature External Sensor Circuit Open - The module senses no voltage drop on the sensor reference voltage circuit, indicating an open circuit.
2. DTC B1257 Air Temperature External Sensor Circuit Short to Ground - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Ambient air temperature sensor
3. HVAC module - DATC

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Scheme 27

1. D1 CHECK THE SENSOR RESISTANCE Key in OFF position. Disconnect: Ambient Temperature Sensor C132 Measure the resistance between the ambient temperature sensor C132 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 D2 . NO : INSTALL a new in-vehicle temperature sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. D2 CHECK THE SENSOR OUTPUT VOLTAGE Key in ON position. Press the AUTO button. Measure the voltage between ambient temperature sensor C132-1, circuit VH407 (YE/GN), harness side and C132-2, circuit RH111 (GY/BU), harness side. Is the voltage between 4.7 and 5.1 volts? YES : INSTALL a new ambient temperature sensor. CLEAR the DTCs. REPEAT the self-test. If code returns, go to D7 . NO : If diagnosing DTC B1255 , go to D3 . If diagnosing DTC B1257 , go to D5 .
3. D3 CHECK CIRCUIT VH407 (YE/GN) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228a Measure the resistance between HVAC module - DATC C228a-2, circuit VH407 (YE/GN), harness side and ambient temperature sensor C132-1, circuit VH407 (YE/GN), harness side. Is the resistance less than 5 ohms? YES : Go to D4 . NO : REPAIR circuit VH407 (YE/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. D4 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and ambient temperature sensor C132-2, circuit RH111 (GY/BU), harness side. Is the resistance less than 5 ohms? YES : Go to D7 . NO : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. D5 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) Key in OFF position. Disconnect: HVAC Module - DATC C228a Measure the resistance between ambient temperature sensor C132-1, circuit VH407 (YE/GN), harness side and C132-2, circuit RH111 (GY/BU), harness side. Is the resistance greater than 10,000 ohms? YES : Go to D6 . NO : REPAIR circuit VH407 (YE/GN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
6. D6 CHECK CIRCUIT VH407 (YE/GN) FOR A SHORT TO GROUND Measure the resistance between HVAC module - DATC C228a-2, circuit VH407 (YE/GN), harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to D7 . NO : REPAIR circuit VH407 (YE/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
7. D7 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test E: DTC B2426, B2427, B2795 or B2796

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, the solar radiation sensor receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the solar radiation sensor from the HVAC module - DATC through circuit VH417 (YE/OG) (RH) and circuit VH416 (VT/GY) (LH).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. A/C solar radiation sensor
3. HVAC module - DATC

Scheme 28

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Scheme 30

Scheme 31

Scheme 32

Scheme 33

1. E1 CHECK THE SOLAR RADIATION SENSOR REFERENCE VOLTAGE Key in OFF position. Disconnect: Solar Radiation Sensor C286 Key in ON position. Press the AUTO button. Measure the voltage between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and solar radiation sensor: For DTC B2426 or B2427 , C286-1, circuit VH417 (YE/OG), harness side. For DTC B2795 or B2796 , C286-3, circuit VH416 (VT/GY), harness side. Is the voltage between 4.7 and 5.1 volts? YES : INSTALL a new solar radiation sensor. CLEAR the DTCs. REPEAT the self-test. If the code returns, go to E6 . NO : If diagnosing DTC B2796 or DTC B2426 , go to E2 . If diagnosing DTC B2795 or DTC B2427 , go to E4 .
2. E2 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228a Measure the resistance between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side. Is the resistance less than 5 ohms? YES : Go to E3 . NO : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. E3 CHECK CIRCUIT VH417 (YE/OG) OR CIRCUIT VH416 (VT/GY) FOR AN OPEN NOTE: For DTC B2796. Measure the resistance between HVAC module - DATC C228a-5, circuit VH416 (VT/GY), harness side and solar radiation sensor C286-3, circuit VH416 (VT/GY), harness side. NOTE: For DTC B2426. Measure the resistance between HVAC module - DATC C228a-4, circuit VH417 (YE/OG), harness side and solar radiation sensor C286-1, circuit VH417 (YE/OG), harness side. Is the resistance less than 5 ohms? YES : Go to E6 . NO : REPAIR circuit VH416 (VT/GY) or circuit VH417 (YE/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. E4 CHECK CIRCUIT VH417 (YE/OG) OR CIRCUIT VH416 (VT/GY) FOR A SHORT TO CIRCUIT RH111 (GY/BU) Key in OFF position. Disconnect: HVAC Module - DATC C228a Measure the resistance between solar radiation sensor C286-4, circuit RH111 (GY/BU), harness side and solar radiation sensor: For DTC B2795 , C286-3, circuit VH416 (VT/GY), harness side. For DTC B2427 , C286-1, circuit VH417 (YE/OG), harness side. Is the resistance greater than 10,000 ohms? YES : Go to E5 . NO : REPAIR circuits VH417 (YE/OG) and VH416 (VT/GY) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. E5 CHECK CIRCUIT VH416 (VT/GY) AND VH417 (YE/OG) FOR A SHORT TO GROUND Measure the resistance between ground and solar radiation sensor: For DTC B2795 , C286-3, circuit VH416 (VT/GY), harness side. For DTC B2427 , C286-1, circuit VH417 (YE/OG), harness side. Is the resistance greater than 10,000 ohms? YES : Go to E6 . NO : REPAIR circuit VH416 (VT/GY) or VH417 (YE/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
6. E6 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test F: DTC B2826 or B2827

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Under normal operation, the evaporator discharge air temperature sensor receives a ground from the HVAC module through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the evaporator discharge air temperature sensor from the HVAC module through circuit VH406 (VT/BN).

1. DTC B2826 Front Evaporator Temp Sensor Circuit Failure - The module senses no voltage drop on the sensor reference voltage circuit, indicating an open circuit.
2. DTC B2827 Front Evaporator Temp Sensor Short to Ground - The module senses excessive voltage drop on the sensor reference voltage circuit, indicating a short directly to ground.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Evaporator discharge air temperature sensor
3. HVAC module - Dual Automatic Temperature Control (DATC)
4. HVAC module - Electronic Manual Temperature Control (EMTC)

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

1. F1 CHECK THE SENSOR RESISTANCE Key in OFF position. Disconnect: Evaporator Discharge Temperature Sensor C296 Measure the resistance between the evaporator discharge temperature sensor C296 terminals and compare to the table below. Ambient Temperature Resistance -40°C (-40°F) 832,519-1,017,523 ohms -20°C (-4°F) 263,111-290,807 ohms 0°C (32°F) 91,058-100,644 ohms 20°C (68°F) 35,473-39,207 ohms 25°C (77°F) 28,500-31,500 ohms 40°C (104°F) 15,307-16,919 ohms 60°C (140°F) 7,171-7,925 ohms 100°C (212°F) 1,976-2,184 ohms 120°C (248°F) 1,131-1,251 ohms Is the resistance within the specified values for the temperatures? YES : Go to F2 . NO : INSTALL a new evaporator discharge sensor. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. F2 CHECK THE SENSOR OUTPUT VOLTAGE Key in ON position. Press the AUTO button. Measure the voltage between evaporator discharge temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side. Is the voltage between 4.7 and 5.1 volts? YES : INSTALL a new evaporator discharge sensor. CLEAR the DTCs. REPEAT the self-test. If code returns, go to F7 . NO : If diagnosing DTC B1946 , go to F3 . If diagnosing DTC B1947 , go to F5 .
3. F3 CHECK CIRCUIT VH406 (VT/BN) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228a or HVAC Module - EMTC C2357a Measure the resistance between HVAC module - EMTC C2357a-6 or HVAC module - DATC C228a-6, circuit VH406 (VT/BN), harness side and evaporator discharge temperature sensor C296-1, circuit VH406 (VT/BN), harness side. Is the resistance less than 5 ohms? YES : Go to F4 . NO : REPAIR circuit VH406 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. F4 CHECK CIRCUIT RH111 (GY/BU) FOR AN OPEN Measure the resistance between HVAC module - EMTC C2357a-10 or HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and evaporator discharge temperature sensor C296-2, circuit RH111 (GY/BU), harness side. Is the resistance less than 5 ohms? YES : Go to F7 . NO : REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. F5 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO CIRCUIT RH111 (GY/BU) Key in OFF position. Disconnect: HVAC Module - DATC C228a or HVAC Module - EMTC C2357a Measure the resistance between evaporator discharge temperature sensor C296-1, circuit VH406 (VT/BN), harness side and C296-2, circuit RH111 (GY/BU), harness side. Is the resistance greater than 10,000 ohms? YES : Go to F6 . NO : REPAIR circuit VH406 (VT/BN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
6. F6 CHECK CIRCUIT VH406 (VT/BN) FOR A SHORT TO GROUND Measure the resistance between HVAC module - EMTC C2357a-6 or HVAC module - DATC C228a-6, circuit VH406 (VT/BN), harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to F7 . NO : REPAIR circuit VH406 (VT/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
7. F7 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test G: HVAC Functions Verification

This pinpoint test is intended to diagnose the following

1. HVAC system

Note. Diagnose any HVAC module DTCs before carrying out the following pinpoint test.

Note. Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to PCM DTC Table .

1. G1 CHECK THE BLOWER MOTOR OPERATION Key in ON position. Select PANEL mode. Observe blower motor operation and select each blower motor speed. Does the blower motor operate in all selections and change speed in each? YES : Go to G2 . NO : Electronic Manual Temperature Control (EMTC) systems, if the blower motor does not operate in any setting, go to «Pinpoint Test O»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-o-the-blower-motor) . Dual Automatic Temperature Control (DATC) systems, if the blower motor does not operate in any setting, go to «Pinpoint Test Q»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-q-the-blower-motor) . EMTC systems, if the blower motor does not properly change speeds or shut OFF, go to «Pinpoint Test P»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-p-the-blower-motor) . DATC systems, if the blower motor does not properly change speeds or shut OFF, go to «Pinpoint Test R»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-r-the-blower-motor) .
2. G2 CHECK AIRFLOW OPERATION Select the highest blower motor setting. NOTE: Refer to Description and Operation in this article for proper airflow descriptions. While observing the airflow, select each of the airflow positions (PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST, DEFROST). Is the airflow directed to the proper outlets? YES : Go to G3 . NO : Go to «Pinpoint Test I»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-i-incorrecterratic-direction-of) .
3. G3 VERIFY TEMPERATURE CONTROL OPERATION Start the vehicle and allow it to reach normal operating temperature. With the A/C OFF, select PANEL mode. Change the temperature setting from the coldest to the warmest and back to the coldest. Does the temperature change between very warm to cool? YES : Go to G4 . NO : If the temperature does not get very warm, go to «Pinpoint Test J»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) . If the temperature does not change at all, go to «Pinpoint Test N»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-n-temperature-control-is) .
4. G4 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF With the A/C OFF, select PANEL mode. Select the coldest temperature setting. Is the outlet temperature close to ambient temperature? YES : Go to G5 . NO : If the temperature is warmer than ambient temperature, go to «Pinpoint Test N»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-n-temperature-control-is) and diagnose for inoperative blend door. If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, go to «Pinpoint Test M»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-m-the-air-conditioning) . If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, go to «Pinpoint Test L»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-l-the-air-conditioning) .
5. G5 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE Make sure the ambient air temperature is above 2°C (35°F). Select PANEL mode. Press the A/C button (indicator ON). Does the A/C clutch engage when the PANEL and A/C buttons (indicator ON) are pressed? YES : Go to G6 . NO : Go to «Pinpoint Test K»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-k-the-air-conditioning) .
6. G6 CHECK THE RECIRC OPERATION Press the RECIRC button (indicator OFF). Select PANEL mode. Select the highest blower motor setting. Observe airflow noise. Press the RECIRC button (indicator ON). Does the airflow noise increase when the RECIRC mode is selected (indicator ON)? YES : If the vehicle is not equipped with auxiliary climate control, the system is operating normally. If the vehicle is equipped with auxiliary climate control, go to G7 . NO : Go to «Pinpoint Test I»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-i-incorrecterratic-direction-of) .
7. G7 CHECK THE AUXILIARY BLOWER MOTOR OPERATION Using the front and rear auxiliary blower motor controls, observe blower motor operation and select each auxiliary blower motor speed. Does the auxiliary blower motor operate in all selections and change speed in each? YES : Go to G8 . NO : If the auxiliary blower motor does not operate in any setting, go to «Pinpoint Test S»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-s-the-auxiliary-blower) . If the auxiliary blower motor does not properly change speeds or shut OFF using both the front and rear auxiliary controls, go to «Pinpoint Test T»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-t-the-auxiliary-blower) . If the auxiliary blower motor does not properly change speeds or shut OFF using both the rear auxiliary controls only, go to «Pinpoint Test W»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-w-the-auxiliary-temperature) .
8. G8 VERIFY AUXILIARY TEMPERATURE/MODE OPERATION Select the highest auxiliary blower motor setting. Using the front and rear auxiliary controls, change the temperature/mode setting from the coldest to the warmest/floor and back to the coldest/overhead. Does the temperature change between very warm to cool and auxiliary airflow to the floor when warm is selected and headliner when cool is selected? YES : The system is operating normally. NO : If the auxiliary temperature control is inoperative/does not operate correctly from both the front and rear auxiliary controls, go to «Pinpoint Test U»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-u-the-auxiliary-temperature) . If the auxiliary temperature control is inoperative/does not operate correctly from the rear auxiliary controls only, go to «Pinpoint Test W»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-w-the-auxiliary-temperature) . If the auxiliary temperature control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the HVAC Module Cold Boot Process. If the condition returns, INSTALL a new HVAC module. REFER To «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. If the auxiliary panel/floor control is inoperative/does not operate correctly from both the front and rear auxiliary controls, go to «Pinpoint Test V»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-v-the-auxiliary-panelfloor) . If the auxiliary panel/floor control is inoperative/does not operate correctly from the rear auxiliary controls only, go to «Pinpoint Test W»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-w-the-auxiliary-temperature) . If the auxiliary panel/floor control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the HVAC Module Cold Boot Process. If the condition returns, INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation.

Pinpoint Test H: The Air Inlet Door is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, to rotate the air inlet door actuator clockwise, the HVAC module supplies voltage to the air inlet door actuator motor through the circuit CH207 (BU/GY), and supplies ground through circuit CH208 (GN/OG). To rotate the air inlet door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.

Note. Dual Automatic Temperature Control (DATC) only.

The air inlet door actuator feedback resistor is supplied a ground from the HVAC module - DATC through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module - DATC reads the voltage on the air inlet door actuator feedback circuit VH438 (GN/VT) to determine the air inlet door actuator position by the position of the actuator feedback resistor wiper arm.

1. DTC B1242 Air Flow Recirculation Door Driver Circuit Failure - The module senses no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Air inlet door actuator motor
3. HVAC module - DATC
4. HVAC module - Electronic Manual Temperature Control (EMTC)
5. Stuck or bound linkage or door

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

1. H1 CHECK FOR DATC Observe the climate controls. Is the vehicle equipped with DATC? YES : Go to H2 . NO : Go to H7 .
2. H2 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Key in OFF position. Disconnect: HVAC Module - DATC C228a Disconnect: HVAC Module - DATC C228b Disconnect: Auxiliary Climate Controls C990 (If equipped) Measure the resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side. Is the resistance greater than 500 ohms? YES : Go to H3 . NO : CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. H3 CHECK POTENTIOMETER HIGH- AND LOW-SIDE RESISTANCE Measure the low-side resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228b-15, circuit VH438 (GN/VT), harness side. Measure the high-side resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228b-15, circuit VH438 (GN/VT), harness side. Is the resistance between 120 and 4,380 ohms? YES : Go to H4 . NO : If the low-side resistance only is greater than 4,380 ohms, CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the low-side resistance only is less than 120 ohms, CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VH438 (GN/VT) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is greater than 4,380 ohms, CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is less than 120 ohms, CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VH438 (GN/VT) and LH111 (BN/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side and low-side resistance is greater than 4,380 ohms, CARRY OUT the Air Inlet Door Actuator Component Test. If the actuator tests OK, REPAIR circuit VH438 (GN/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. H4 CHECK CIRCUIT LH111 (BN/WH) OR VH438 (GN/VT) FOR A SHORT TO GROUND Disconnect: Air Inlet Door Actuator C289 Measure the resistance between ground and the following: HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side. HVAC module - DATC C228b-15, circuit VH438 (GN/VT), harness side. Are the resistances greater than 10,000 ohms? YES : Go to H5 . NO : REPAIR circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. H5 CHECK CIRCUIT RH111 (GY/BU) OR VH438 (GN/VT) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side. HVAC module - DATC C228b-15, circuit VH438 (GN/VT), harness side. Are any voltages present? YES : REPAIR circuit(s) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to H6 .
6. H6 CHECK DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. 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. Observe the actuator driveshaft. Key in ON position. Connect a fused jumper wire between: HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side. HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side. Remove the fused jumpers. Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228b-15, circuit VH438 (GN/VT), harness side. Connect a fused jumper wire between: HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side. HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side. HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for binding or broken door and linkage. REPAIR as necessary. If no condition is found, go to H9 . NO : Go to H8 .
7. H7 CHECK DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Key in OFF position. Disconnect: HVAC Module - EMTC C2357a 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. Observe the actuator driveshaft. Key in ON position. Connect a fused jumper wire between: HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side. HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side. HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side. Does the actuator motor rotate in both directions? YES : INSPECT for binding or broken door and linkage. REPAIR as necessary. If no condition is found, go to H9 . NO : Go to H8 .
8. H8 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN Disconnect: Air Inlet Door Actuator C289 Measure the resistance between HVAC module - EMTC C2357a-16 or HVAC module - DATC C228a-16, circuit CH207 (BU/GY), harness side and recirc door actuator C289-6, circuit CH207 (BU/GY), harness side. Measure the resistance between HVAC module - EMTC C2357a-15 or HVAC module - DATC C228a-15, circuit CH208 (GN/OG), harness side and recirc door actuator C289-5, circuit CH208 (GN/OG), harness side. Are the resistances less than 5 ohms? YES : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. NO : REPAIR the circuit(s) for an open. TEST the system for normal operation.
9. H9 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test I: Incorrect/Erratic Direction of Airflow From Outlets

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, to rotate the mode door actuator clockwise, the HVAC module supplies voltage to the FLOOR/DEFROST/PANEL mode door actuator motor through the circuit CH228 (YE/GY), and supplies ground through circuit CH229 (WH/BU). To rotate the mode door actuator counterclockwise, the HVAC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the HVAC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module reads the voltage on the mode door actuator feedback circuit VH436 (YE/VT) to determine the mode door actuator position by the position of the actuator feedback resistor wiper arm.

1. DTC B1003 Mode Door Short/Failure - The module senses no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Mode door actuator
3. HVAC module - Dual Automatic Temperature Control (DATC)
4. HVAC module - Electronic Manual Temperature Control (EMTC)
5. Stuck or bound linkage or door

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. I1 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 I2 . If the RECIRC button does not change the air inlet door position, go to «Pinpoint Test H»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-h-the-air-inlet) .
2. I2 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: HVAC Module - DATC C228a or HVAC Module - EMTC C2357a Disconnect: Auxiliary Climate Controls C990 (If equipped) Measure the resistance between HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side. Is the resistance greater than 500 ohms? YES : Go to I3 . NO : CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. I3 CHECK THE POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE Measure the low-side resistance between HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228a-8 or HVAC module - EMTC C2357a-8, circuit VH436 (YE/VT), harness side. Measure the high-side resistance between HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-8 or HVAC module - EMTC C2357a-8, circuit VH436 (YE/VT), harness side. Are the resistances between 187 and 4,313 ohms? YES : Go to I4 . NO : If the low-side resistance only is greater than 4,313 ohms, CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the low-side resistance only is less than 187 ohms, CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VH436 (YE/VT) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is greater than 4,313 ohms, CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is less than 187 ohms, CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VH436 (YE/VT) and LH111 (BN/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side and low-side resistance is greater than 4,313 ohms, CARRY OUT the FLOOR/DEFROST/PANEL Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuit VH436 (YE/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. I4 CHECK CIRCUIT LH111 (BN/WH) OR CIRCUIT VH436 (YE/VT) FOR A SHORT TO GROUND Disconnect: Floor/Defrost/Panel Door Actuator C2278 Measure the resistance between ground and the following: HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side. HVAC module - DATC C228a-8 or HVAC module - EMTC C2357a-8, circuit VH436 (YE/VT), harness side. Are the resistances greater than 10,000 ohms? YES : Go to I5 . NO : REPAIR circuit LH111 (BN/WH) or circuit VH436 (YE/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. I5 CHECK CIRCUIT RH111 (GY/BU) OR CIRCUIT VH436 (YE/VT) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side. HVAC module - DATC C228a-8 or HVAC module - EMTC C2357a-8, circuit VH436 (YE/VT), harness side. Is any voltage present? YES : REPAIR circuit RH111 (GY/BU) or circuit VH436 (YE/VT) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to I6 .
6. I6 CHECK THE DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Connect a fused jumper wire between: HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-19 or HVAC module - EMTC C2357a-19, circuit CH229 (WH/BU), harness side. HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-20 or HVAC module - EMTC C2357a-20, circuit CH228 (YE/GY), harness side. Remove the fused jumpers. Measure the resistance between HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228a-8 or HVAC module - EMTC C2357a-8, circuit VH436 (YE/VT), harness side. Connect a fused jumper wire between: HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-19 or HVAC module - EMTC C2357a-19, circuit CH229 (WH/BU), harness side. HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-20 or HVAC module - EMTC C2357a-20, circuit CH228 (YE/GY), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-19 or HVAC module - EMTC C2357a-19, circuit CH229 (WH/BU), harness side. HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-20 or HVAC module - EMTC C2357a-20, circuit CH228 (YE/GY), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to I8 . NO : Go to I7 .
7. I7 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test. Disconnect: Floor/Defrost/Panel Door Actuator C2278 Measure the resistance between HVAC module - DATC C228a-19 or HVAC module - EMTC C2357a-19, circuit CH229 (WH/BU), harness side and floor/defrost/panel door actuator C2278-1, circuit CH229 (WH/BU), harness side. Measure the resistance between HVAC module - DATC C228a-20 or HVAC module - EMTC C2357a-20, circuit CH228 (YE/GY), harness side and floor/defrost/panel door actuator C2278-6, circuit CH228 (YE/GY), harness side. Are the resistances less than 5 ohms? YES : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. NO : REPAIR the circuit CH228 (YE/GY) or circuit CH229 (WH/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
8. I8 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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

This pinpoint test is intended to diagnose the following

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

Scheme 56

Scheme 57

1. J1 CHECK FOR CORRECT 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 J3 . NO : Go to J2 .
2. J2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS Pressure test the cooling system for leaks. Refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article. Does the engine cooling system leak? YES : REPAIR the engine coolant leak. TEST the system for normal operation. NO : Go to J3 .
3. J3 CHECK FOR COOLANT FLOW TO THE HEATER CORE Run the engine until it reaches normal operation temperature. Select the FLOOR position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting. Using a suitable thermo-couple temperature measuring device, check the heater core inlet hose to see if it is hot. Is the heater core inlet hose hot? YES : Go to J4 . NO : REFER to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article to check cooling system function.
4. J4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE Using a suitable thermo-couple temperature measuring device, measure the heater core outlet hose temperature. Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17°C [10-30°F])? YES : Go to «Pinpoint Test K»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-k-the-air-conditioning) and diagnose for a blend door actuator. NO : INSTALL a new heater core. TEST the system for normal operation.

Pinpoint Test K: The Air Conditioning (A/C) is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, when A/C is requested, a message is sent from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) bus to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit SBB24 (VT/RD). When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH421 (GY). Ground is supplied for the A/C clutch through circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. PCM
4. HVAC module - Dual Automatic Temperature Control (DATC)
5. HVAC module - Electronic Manual Temperature Control (EMTC)
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. It is important to install relays in their correct position in the Battery Junction Box (BJB)). Installing a relay incorrectly may cause wiring shorts or damage to modules. While carrying out diagnostics on relays, have only one BJB relay removed at a time. Failure to follow these instructions may result in damage to the vehicle circuitry or to control modules.

Note. Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Table .

Note. Before carrying out the following test, diagnose any Instrument Cluster (IC) 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 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

1. K1 CHECK THE A/C PRESSURE SENSOR (ACP_PRESS) PCM PID Key in ON position. Enter the following diagnostic mode on the diagnostic tool: ACP_PRESS PCM PID With the R-134a Manifold Gauge Set connected, compare the pressure readings of the R-134a Manifold Gauge Set and the ACP_PRESS PID. Are the pressure values of the R-134a Manifold Gauge Set and the ACP_PRESS PID similar? YES : Go to K2 . NO : INSTALL a new A/C pressure transducer. TEST the system for normal operation.
2. K2 CHECK THE AIR CONDITIONING SWITCH STATUS (AC_SEL_SW) HVAC PID WITH THE A/C ON Enter the following diagnostic mode on the diagnostic tool: AC_SEL_SW HVAC PID Press the PANEL manual override button and press the A/C button (indicator on) on the HVAC module - DATC or select PANEL mode and press the A/C button (indicator on) on the HVAC module - EMTC. Does the AC_SEL_SW HVAC PID read PRESSED? YES : DATC, go to K3 . EMTC, CARRY OUT the A/C Evaporator Discharge Temperature Sensor Component Test. If the sensor tests OK, go to K4 . NO : Go to K10 .
3. K3 CHECK THE A/C EVAPORATOR TEMPERATURE (EVAP_TEMP) HVAC ) 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 diagnostic tool: EVAP_TEMP HVAC PID Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? YES : Go to K4 . NO : INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
4. K4 CHECK THE AIR CONDITIONING CLUTCH (WAC/ACCR) PCM PID WITH THE A/C ON Enter the following diagnostic mode on the diagnostic tool: WAC/ACCR PCM PID Does the WAC/ACCR PCM PID read ON? YES : Go to K5 . NO : Go to K11 .
5. K5 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 HVAC module - DATC or select MAX A/C on the HVAC module - EMTC. Measure the voltage between A/C compressor clutch field coil C100-1, circuit CH421 (GY), harness side and ground. Is the voltage greater than 10 volts? YES : Go to K6 . NO : Go to K8 .
6. K6 CHECK THE GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL Key in OFF position. Measure the resistance between A/C compressor clutch field coil C100-2, circuit GD120 (BK/GN), harness side and ground. Is the resistance less than 5 ohms? YES : Go to K7 . NO : REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.
7. K7 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 average greater than 0.65 mm (0.030 in)? YES : ADJUST the A/C compressor clutch gap. REFER to «Air Conditioning (A/C) Clutch Air Gap Adjustment»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-clutch-air-gap) . TEST the system for normal operation. NO : INSTALL a new A/C compressor clutch field coil. TEST the system for normal operation.
8. K8 CHECK THE A/C CLUTCH RELAY FOR VOLTAGE Key in OFF position. Disconnect: A/C Clutch Relay Key in ON position. Measure the voltage between the A/C clutch relay socket, circuit SBB24 (VT/RD) and ground. Is the voltage greater than 10 volts? YES : Go to K9 . NO : VERIFY Battery Junction Box (BJB) fuse 24 (10A) is OK. If OK, REPAIR circuit SBB24 (VT/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
9. K9 CHECK CIRCUIT CH421 (GY) FOR AN OPEN Key in OFF position. Measure the resistance between the A/C clutch relay socket, circuit CH421 (GY) and A/C compressor clutch field coil C100-1, circuit CH421 (GY), harness side. Is the resistance less than 5 ohms? YES : CARRY OUT the A/C clutch relay component test. If the relay tests OK, go to K11 . NO : REPAIR circuit CH421 (GY) for an open. TEST the system for normal operation.
10. K10 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
11. K11 CHECK THE PCM CONNECTION Clear the DTCs. Disconnect all of the PCM connectors. Check for: corrosion. pushed-out connectors. incorrectly seated connector. Connect and correctly seat all of the PCM connectors. Operate the system. Does the concern return? YES : INSTALL a new PCM. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test L: The Air Conditioning (A/C) is Always On - A/C Compressor Does Not Cycle

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, when A/C is requested, a message is sent from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) bus to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit SBB24 (VT/RD). When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH421 (GY). Ground is supplied for the A/C clutch through circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. PCM
3. HVAC module - Dual Automatic Temperature Control (DATC)
4. HVAC module - Electronic Manual Temperature Control (EMTC)
5. A/C evaporator discharge temperature sensor
6. A/C control relay
7. A/C clutch air gap

Note. Before carrying out the following test, diagnose any PCM or Instrument Cluster (IC) 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.

1. L1 CHECK THE A/C EVAPORATOR TEMPERATURE (EVAP_TEMP) HVAC PID Key in ON position. Allow the vehicle exterior and interior to stabilize to an ambient temperature above 16°C (60°F). Enter the following diagnostic mode on the diagnostic tool: EVAP_TEMP HVAC PID Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? YES : Go to L2 . NO : INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
2. L2 CHECK THE AIR CONDITIONING CLUTCH (WAC/ACCR) PCM PID WITH THE A/C OFF Enter the following diagnostic mode on the diagnostic tool: WAC/ACCR PCM PID Does the WAC/ACCR PCM PID read ON? YES : Go to L5 . NO : Go to L3 .
3. L3 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 HVAC module. With the engine running, measure the voltage between A/C compressor clutch field coil C100-1, circuit CH421 (GY), harness side and ground. Is the voltage greater than 10 volts? YES : Go to L4 . NO : ADJUST the A/C compressor clutch gap. REFER to «Air Conditioning (A/C) Clutch Air Gap Adjustment»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-clutch-air-gap) . TEST the system for normal operation.
4. L4 CHECK CIRCUIT CH421 (GY) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: A/C Clutch Relay Key in ON position. Measure the voltage between A/C compressor clutch field coil C100-1, circuit CH421 (GY), harness side and ground. Is the voltage greater than 10 volts? YES : REPAIR circuit CH421 (GY) for a short to voltage. TEST the system for normal operation. NO : INSTALL a new A/C clutch relay. TEST the system for normal operation.
5. L5 CHECK THE PCM CONNECTION Clear the DTCs. Disconnect all of the PCM connectors. Check for: corrosion. pushed-out connectors. incorrectly seated connector. Connect and correctly seat all of the PCM connectors. Operate the system. Does the concern return? YES : INSTALL a new PCM. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test M: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, when A/C is requested, a message is sent from the HVAC module over the Medium Speed Controller Area Network (MS-CAN) bus to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit SBB24 (VT/RD). When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH421 (GY). Ground is supplied for the A/C clutch through circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. PCM
3. HVAC module - Dual Automatic Temperature Control (DATC)
4. HVAC module - Electronic Manual Temperature Control (EMTC)
5. A/C evaporator discharge temperature sensor
6. A/C pressure transducer
7. A/C control relay
8. A/C clutch air gap

Note. Before carrying out the following test, diagnose any PCM or Instrument Cluster (IC) 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.

1. M1 CHECK THE ACCS PCM PID WITH THE A/C OFF Key in ON position. Enter the following diagnostic mode on the diagnostic tool: ACCS PCM PID Does the ACCS PCM PID read ON? YES : Go to M2 . NO : Go to M4 .
2. M2 CHECK THE AIR CONDITIONING SWITCH STATUS (AC_SEL_SW) HVAC PID WITH THE A/C OFF Enter the following diagnostic mode on the diagnostic tool: AC_SEL_SW HVAC PID Does the AC_SEL_SW HVAC PID read PRESSED? YES : Go to M3 . NO : Go to M4 .
3. M3 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. M4 CHECK THE PCM CONNECTION Clear the DTCs. Disconnect all of the PCM connectors. Check for: corrosion. pushed-out connectors. incorrectly seated connector. Connect and correctly seat all of the PCM connectors. Operate the system. Does the concern return? YES : INSTALL a new PCM. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Pinpoint Test N: Temperature Control is Inoperative/Does Not Operate Correctly

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, to rotate the blend door actuator clockwise, the HVAC 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 HVAC module reverses the voltage and ground circuits.

The blend door actuator feedback resistors are supplied a ground from the HVAC module by the blend door actuator return circuits and a 5-volt reference voltage on the blend door actuator reference circuits. The HVAC 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 - CH238 (YE/OG)
2. RH blend - CH212 (BU/OG)

Door actuator feed B circuits

1. LH blend - CH239 (BU/WH)
2. RH blend - CH213 (BN/GN)

Door actuator return circuits

1. LH blend - RH111 (GY/BU)
2. RH blend - RH111 (GY/BU)

Door actuator reference circuits

1. LH blend - LH111 (BN/WH)
2. RH blend - LH111 (BN/WH)

Door actuator feedback circuits

1. LH blend - VH440 (BU/BN)
2. RH blend - VH411 (VT/GN)

1. DTC B2266 LH Blend Door Failure or Short - The module senses no change in actuator feedback voltage when the actuator motor has been energized.
2. DTC B2267 RH Blend Door Failure or Short - The module senses no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Blend door actuator
3. HVAC module - Dual Automatic Temperature Control (DATC)
4. HVAC module - Electronic Manual Temperature Control (EMTC)
5. Stuck or bound linkage or door

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

1. N1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: HVAC Module - DATC C228a or HVAC Module - EMTC C2357a Disconnect: HVAC Module - DATC C228b Disconnect: Auxiliary Climate Controls C990 (If equipped) Measure the resistance between HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side. Is the resistance greater than 500 ohms? YES : Go to N2 . NO : CARRY OUT the Blend Door Actuator Component Test. If the actuator tests OK, REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. N2 CHECK THE POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE Measure the low-side resistance between HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side and the following: For DTC B2266 , HVAC module - DATC C228a-7 or HVAC module - EMTC C2357a-7, circuit VH440 (BU/BN), harness side. For DTC B2267 , HVAC module - DATC C228b-24, circuit VH411 (VT/GN), harness side. Measure the high-side resistance between HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side and the following: For DTC B2266 , HVAC module - DATC C228a-7 or HVAC module - EMTC C2357a-7, circuit VH440 (BU/BN), harness side. For DTC B2267 , HVAC module - DATC C228b-24, circuit VH411 (VT/GN), harness side. Are the resistances between 120 and 4,380 ohms? YES : Go to N3 . NO : If the low-side resistance only is greater than 4,380 ohms, CARRY OUT the Blend Door Actuator Component Test. If the actuator tests OK, REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the low-side resistance only is less than 120 ohms, CARRY OUT the Blend Door Actuator Test. If the actuator tests OK, REPAIR circuit VH440 (BU/BN) or VH411 (VT/GN) for a short to circuit RH111 (GY/BU). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is greater than 4,380 ohms, CARRY OUT the Blend Door Actuator Component Test. If the actuator tests OK, REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is less than 120 ohms, CARRY OUT the Blend Door Actuator Component Test. If the actuator tests OK, REPAIR circuits circuit VH440 (BU/BN) or VH411 (VT/GN) for a short to circuit LH111 (BN/WH). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side and low-side resistance is greater than 4,380 ohms, CARRY OUT the Blend Door Actuator Component Test. If the actuator tests OK, REPAIR circuit VH440 (BU/BN) or VH411 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. N3 CHECK CIRCUITS LH111 (BN/WH), VH440 (BU/BN) OR VH411 (VT/GN) FOR A SHORT TO GROUND Measure the resistance between ground and the following: HVAC module - DATC C228a-11 or HVAC module - EMTC C2357a-11, circuit LH111 (BN/WH), harness side. For DTC B2266 , HVAC module - DATC C228a-7 or HVAC module - EMTC C2357a-7, circuit VH440 (BU/BN), harness side. For DTC B2267 , HVAC module - DATC C228b-24, circuit VH411 (VT/GN), harness side. Are the resistances greater than 10,000 ohms? YES : Go to N4 . NO : REPAIR circuit LH111 (BN/WH), VH411 (VT/GN) or VH440 (BU/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. N4 CHECK CIRCUITS RH111 (GY/BU), VH440 (BU/BN) OR VH411 (VT/GN) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side. For DTC B2266 , HVAC module - DATC C228a-7 or HVAC module - EMTC C2357a-7, circuit VH440 (BU/BN), harness side. For DTC B2267 , HVAC module - DATC C228b-24, circuit VH411 (VT/GN), harness side. Are any voltages present? YES : REPAIR circuits RH111 (GY/BU), VH411 (VT/GN) or VH440 (BU/BN) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : For DTC B2266 , go to N5 . For DTC B2267 , go to N6 .
5. N5 CHECK THE DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Connect a fused jumper wire between: HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-22 or HVAC module - EMTC C2357a-22, circuit CH238 (YE/OG), harness side. HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-21 or HVAC module - EMTC C2357a-21, circuit CH239 (BU/WH), harness side. Remove the fused jumpers. Measure the resistance between HVAC module - DATC C228a-10 or HVAC module - EMTC C2357a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228a-7 or HVAC module - EMTC C2357a-7, circuit VH440 (BU/BN), harness side. Connect a fused jumper wire between: HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-22 or HVAC module - EMTC C2357a-22, circuit CH238 (YE/OG), harness side. HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-21 or HVAC module - EMTC C2357a-21, circuit CH239 (BU/WH), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - DATC C228a-23 or HVAC module - EMTC C2357a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-22 or HVAC module - EMTC C2357a-22, circuit CH238 (YE/OG), harness side. HVAC module - DATC C228a-13 or HVAC module - EMTC C2357a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-21 or HVAC module - EMTC C2357a-21, circuit CH239 (BU/WH), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to N8 . NO : Go to N7 .
6. N6 CHECK THE DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-26, circuit CH212 (BU/OG), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-25, circuit CH213 (BN/GN), harness side. Remove the fused jumpers. Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side and HVAC module - DATC C228b-24, circuit VH411 (VT/GN), harness side. Connect a fused jumper wire between: HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228a-26, circuit CH212 (BU/OG), harness side. HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-24, circuit CH213 (BN/GN), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228a-26, circuit CH212 (BU/OG), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-25, circuit CH213 (BN/GN), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to N8 . NO : Go to N7 .
7. N7 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test. 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 , HVAC module - DATC C228a-22 or HVAC module - EMTC C2357a-22, circuit CH238 (YE/OG), harness side and LH blend door actuator C2091-6, circuit CH238 (YE/OG), harness side. For DTC B2267 , HVAC module - DATC C228b-26, circuit CH212 (BU/OG), harness side and RH blend door actuator C2092-6, circuit CH212 (BU/OG), harness side. Measure the resistance between: For DTC B2266 , HVAC module - DATC C228a-21 or HVAC module - EMTC C2357a-21, circuit CH239 (BU/WH), harness side and LH blend door actuator C2091-5, circuit CH239 (BU/WH), harness side. For DTC B2267 , HVAC module - DATC C228b-25, circuit CH213 (BN/GN), harness side and RH blend door actuator C2092-5, circuit CH213 (BN/GN), harness side. Are the resistances less than 5 ohms? YES : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. NO : REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
8. N8 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. NOTE: DATC systems only. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test O: The Blower Motor is Inoperative - EMTC

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Under normal operation, the blower motor relay coil receives ignition voltage through circuit CBP45 (YE). The coil receives ground from the HVAC module - Electronic Manual Temperature Control (EMTC) through circuit CH123 (VT/GN). Voltage is supplied to the relay switch contact through circuit SBB35 (BU/RD). When the relay coil is energized, voltage is delivered to the blower motor through circuit CH402 (YE/GN). Ground for the blower motor is provided through circuit CH426 (YE/OG) from the blower resistor or the blower switch (HI). The blower resistor and blower switch is grounded through circuit GD111 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. Blower motor
4. Blower motor relay
5. Blower motor switch
6. HVAC module - EMTC

Scheme 75

Scheme 76

Scheme 77

Scheme 78

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Scheme 80

Scheme 81

Scheme 82

Scheme 83

1. O1 CHECK CIRCUIT CH426 (YE/OG) FOR GROUND Disconnect: Blower Motor C2004 Turn the function selector switch to the PANEL position. Turn the blower motor switch to the HI position. Measure the resistance between blower motor connector C2004-2, circuit CH426 (YE/OG), harness side and ground. Is the resistance less than 5 ohms? YES : Go to O4 . NO : Go to O2 .
2. O2 CHECK CIRCUIT CH426 (YE/OG) FOR AN OPEN Disconnect: Blower Motor Switch C2357b Measure the resistance between blower motor switch C2357b-2, circuit CH426 (YE/OG), harness side and blower motor C2004-2, circuit CH426 (YE/OG), harness side. Is the resistance less than 5 ohms? YES : Go to O3 . NO : REPAIR circuit CH426 (YE/OG) for an open. TEST the system for normal operation.
3. O3 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN Measure the resistance between blower motor switch C2357b-1, circuit GD111 (BK/BU), harness side 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 GD111 (BK/BU) for an open. TEST the system for normal operation.
4. O4 CHECK A/C BLOWER MOTOR CIRCUIT CH402 (YE/GN) FOR VOLTAGE Key in ON position. Measure the voltage between blower motor connector C2004-1, circuit CH402 (YE/GN), harness side and ground. Is the voltage greater than 10 volts? YES : INSTALL a new blower motor. TEST the system for normal operation. NO : Go to O5 .
5. O5 CHECK CIRCUIT CH402 (YE/GN) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Relay Measure the resistance between blower motor relay connector pin 87, circuit CH402 (YE/GN) and blower motor C2004-1, circuit CH402 (YE/GN), harness side. Is the resistance less than 5 ohms? YES : Go to O6 . NO : REPAIR circuit CH402 (YE/GN) for an open. TEST the system for normal operation.
6. O6 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 SBB35 (BU/RD) and pin 87, circuit CH402 (YE/GN). Does the blower motor operate? YES : Go to O7 . NO : VERIFY Battery Junction Box (BJB) fuse 35 (40A) is OK. If OK, REPAIR circuit SBB35 (BU/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
7. O7 CHECK THE RELAY COIL SUPPLY VOLTAGE Key in OFF position. Measure the voltage between blower motor relay socket pin 85, circuit CBP45 (YE) and ground. Is the voltage greater than 10 volts? YES : Go to O8 . NO : VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR circuit CBP45 (YE) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
8. O8 CHECK THE BLOWER MOTOR RELAY NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use the test lamp probe. Key in ON position. With the engine running, connect a 12-volt test lamp between blower motor relay socket pin 86, circuit CH123 (VT/GN) and socket pin 85, circuit CBP45 (YE). Does the test lamp illuminate? YES : INSTALL a new blower motor relay. TEST the system for normal operation. NO : Go to O9 .
9. O9 CHECK CIRCUIT CH123 (VT/GN) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - EMTC C2357b Measure the resistance between blower motor relay connector pin 86, circuit CH123 (VT/GN) and HVAC module - EMTC C2357a-24, circuit CH123 (VT/GN), harness side. Is the resistance less than 5 ohms? YES : Go to O10 . NO : REPAIR circuit CH123 (VT/GN) for an open. TEST the system for normal operation.
10. O10 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - EMTC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

Pinpoint Test P: The Blower Motor Does Not Operate Correctly - EMTC

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Under normal operation, the blower motor is provided a ground from the blower resistor through circuit CH426 (YE/OG). The resistor gets a ground from circuit GD111 (BK/BU) in the lowest blower setting. In MED-LO and MED-HI, the resistor gets a ground from the blower motor switch through circuit CH428 (GN/WH) or CH429 (GY/BN), depending on selected speed. In HI, the blower motor is grounded directly through the blower motor switch from circuit CH426 (YE/OG) to circuit GD111 (BK/BU). The blower switch receives its ground from circuit GD111 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Blower motor resistor
3. Blower motor switch

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

1. P1 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 P2 . If the blower motor does not operate in MED-HI, go to P3 . If the blower motor does not operate in MED-LO, go to P4 . If the blower motor does not operate in LO, go to P5 . For all other symptoms, go to P7 . NO : Go to «Pinpoint Test O»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-o-the-blower-motor) .
2. P2 CHECK CIRCUIT CH426 (YE/OG) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C2357b Disconnect: Blower Motor C2004 Measure the resistance between blower motor switch C2357b-2, circuit CH426 (YE/OG), harness side and blower motor C2004-2, circuit CH426 (YE/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P6 . NO : REPAIR circuit CH426 (YE/OG) for an open. TEST the system for normal operation.
3. P3 CHECK CIRCUIT CH429 (GY/BN) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C2357b Disconnect: Blower Motor Resistor C2185 Measure the resistance between blower motor switch C2357b-3, circuit CH429 (GY/BN), harness side and blower motor resistor C2185-3, circuit CH429 (GY/BN), harness side. Is the resistance less than 5 ohms? YES : Go to P6 . NO : REPAIR circuit CH429 (GY/BN) for an open. TEST the system for normal operation.
4. P4 CHECK CIRCUIT CH428 (GN/WH) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Switch C2357b Disconnect: Blower Motor Resistor C2185 Measure the resistance between blower motor switch C2357b-4, circuit CH428 (GN/WH), harness side and blower motor resistor C2185-1, circuit CH428 (GN/WH), harness side. Is the resistance less than 5 ohms? YES : Go to P6 . NO : REPAIR circuit CH428 (GN/WH) for an open. TEST the system for normal operation.
5. P5 CHECK BLOWER MOTOR RESISTOR GROUND CIRCUIT GD111 (BK/BU) FOR AN OPEN Measure the resistance between blower motor resistor C2185-4, circuit GD111 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to P6 . NO : REPAIR circuit GD111 (BK/BU) for an open. TEST the system for normal operation.
6. P6 CHECK THE BLOWER MOTOR RESISTOR Carry out the blower motor resistor component test. Does the blower motor resistor test good? YES : Go to P7 . NO : INSTALL a new blower motor resistor. TEST the system for normal operation.
7. P7 CHECK THE BLOWER MOTOR SWITCH CIRCUIT GD111 (BK/BU) FOR AN OPEN Measure the resistance between blower motor switch C2357b-1, circuit GD111 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to P8 . NO : REPAIR circuit GD111 (BK/BU) for an open. TEST the system for normal operation.
8. P8 CHECK CIRCUITS CH426 (YE/OG), CH428 (GN/WH) AND CH429 (GY/BN) 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: C2185-1, circuit CH428 (GN/WH), harness side. C2185-2, circuit CH426 (YE/OG), harness side. C2185-3, circuit CH429 (GY/BN), harness side. Are the resistances greater than 10,000 ohms? YES : Go to P9 . NO : REPAIR the affected circuit for a short to ground. TEST the system for normal operation.
9. P9 CHECK THE BLOWER MOTOR CIRCUITS FOR SHORTS TOGETHER Measure the resistance between blower motor resistor: C2185-1, circuit CH428 (GN/WH), harness side and C2185-2, circuit CH426 (YE/OG), harness side. C2185-1, circuit CH428 (GN/WH), harness side and C2185-3, circuit CH429 (GY/BN), harness side. C2185-2, circuit CH426 (YE/OG), harness side and C2185-3, circuit CH429 (GY/BN), harness side. 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.

Pinpoint Test Q: The Blower Motor is Inoperative - DATC

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, the blower motor relay coil receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit CH123 (VT/GN). The coil receives ignition voltage through circuit CBP45 (YE). Voltage is supplied to the relay switch contact through circuit SBB35 (BU/RD). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit CH402 (YE/GN). Ground for the motor is provided through circuit VH301 (YE/BU) from the blower control module. Ground for the blower control module is provided by circuit GD111 (BK/BU). The HVAC module - DATC sends a Pulse-Width Modulation (PWM) signal to the blower control module through circuit VH101 (WH/VT) to control the blower speed.

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. Blower motor relay
4. Blower motor control module
5. HVAC module - DATC
6. Blower motor

Scheme 90

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Scheme 97

1. Q1 VERIFY THE BLOWER MOTOR OPERATION Key in ON position. Press the PANEL button on the HVAC module - DATC. Adjust the blower motor setting to LO and then to HI. Is the blower motor inoperative in all settings? YES : Go to Q2 . NO : Go to «Pinpoint Test R»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-r-the-blower-motor) .
2. Q2 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 CH402 (YE/GN), harness side and ground. Is the voltage greater than 10 volts? YES : Go to Q3 . NO : Go to Q9 .
3. Q3 CHECK FOR VOLTAGE TO THE BLOWER MOTOR CONTROLLER Key in OFF position. Disconnect: Blower Motor Speed Control C271 Key in ON position. Measure the voltage between blower motor speed control C271-4, circuit CH402 (YE/GN), harness side and ground. Is the voltage greater than 10 volts? YES : Go to Q4 . NO : REPAIR circuit CH402 (YE/GN) for an open. TEST the system for normal operation.
4. Q4 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C271-1, circuit GD111 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to Q5 . NO : REPAIR circuit GD111 (BK/BU) for an open. TEST the system for normal operation.
5. Q5 CHECK CIRCUIT VH301 (YE/BU) FOR AN OPEN Measure the resistance between blower motor C2004-2, circuit VH301 (YE/BU), harness side and blower motor speed control C271-2, circuit VH301 (YE/BU), harness side. Is the resistance less than 5 ohms? YES : Go to Q6 . NO : REPAIR circuit VH301 (YE/BU) for an open. TEST the system for normal operation.
6. Q6 CHECK THE BLOWER MOTOR Connect: Blower Motor C2004 Connect a fused jumper lead between blower motor speed control C271-2, circuit VH301 (YE/BU), harness side and C271-1, circuit GD111 (BK/BU), harness side. Key in ON position. Does the blower motor operate? YES : Go to Q7 . NO : INSTALL a new blower motor. TEST the system for normal operation.
7. Q7 CHECK CIRCUIT VH101 (WH/VT) FOR A SHORT TO GROUND Key in OFF position. Remove the fused jumper lead from blower motor speed control C271. Disconnect: HVAC Module - DATC C228b Measure the resistance between blower motor speed control C271-3, circuit VH101 (WH/VT), harness side and ground. Is the resistance greater than 10,000 ohms? YES : Go to Q8 . NO : REPAIR circuit VH101 (WH/VT) for a short to ground. TEST the system for normal operation.
8. Q8 CHECK CIRCUIT VH101 (WH/VT) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C271-3, circuit VH101 (WH/VT), harness side and HVAC module - DATC C228b-16, circuit VH101 (WH/VT), harness side. 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 HVAC module - DATC. TEST the system for normal operation. NO : REPAIR circuit VH101 (WH/VT) for an open. TEST the system for normal operation.
9. Q9 CHECK CIRCUIT CH402 (YE/GN) FOR AN OPEN Key in OFF position. Disconnect: Blower Motor Relay Measure the resistance between blower motor relay socket pin 87, circuit CH402 (YE/GN) and blower motor C2004-1, circuit CH402 (YE/GN), harness side. Is the resistance less than 5 ohms? YES : Go to Q10 . NO : REPAIR circuit CH402 (YE/GN) for an open. TEST the system for normal operation.
10. Q10 CHECK THE RELAY COIL SUPPLY VOLTAGE Measure the voltage between blower motor relay socket pin 85, circuit CBP45 (YE) and ground. Is the voltage greater than 10 volts? YES : Go to Q11 . NO : VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR circuit CBP45 (YE) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
11. Q11 CHECK THE RELAY SWITCH POWER CIRCUIT FOR AN OPEN Measure the voltage between blower motor relay socket pin 30, circuit SBB35 (BU/RD) and ground. Is the voltage greater than 10 volts? YES : Go to Q12 . NO : VERIFY Battery Junction Box (BJB) fuse 35 (40A) is OK. If OK, REPAIR circuit SBB35 (BU/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
12. Q12 CHECK THE MODULE OUTPUT NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use the test lamp probe. Key in ON position. With the engine running, connect a 12-volt test lamp between blower motor relay socket pin 85, circuit CBP45 (YE) and socket pin 86, circuit CH123 (VT/GN). Is the voltage greater than 10 volts? YES : INSTALL a new blower motor relay. TEST the system for normal operation. NO : Go to Q13 .
13. Q13 CHECK CIRCUIT CH123 (VT/GN) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: HVAC Module - DATC C228a Key in ON position. Measure the voltage between blower motor relay socket pin 86, circuit CH123 (VT/GN) and ground. Is any voltage present? YES : REPAIR circuit CH123 (VT/GN) for a short to voltage. TEST the system for normal operation. NO : Go to Q14 .
14. Q14 CHECK CIRCUIT CH123 (VT/GN) FOR AN OPEN Measure the resistance between HVAC module - DATC C228a-24, circuit CH123 (VT/GN), harness side and blower motor relay socket pin 86, circuit CH123 (VT/GN). Is the resistance less than 5 ohms? YES : INSTALL a new HVAC module - DATC. TEST the system for normal operation. NO : REPAIR circuit CH123 (VT/GN) for an open. TEST the system for normal operation.

Pinpoint Test R: The Blower Motor Does Not Operate Correctly - DATC

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Under normal operation, the blower motor relay coil receives a ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit CH123 (VT/GN). The coil receives ignition voltage through circuit CBP45 (YE). Voltage is supplied to the relay switch contact. When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit CH402 (YE/GN). Ground for the motor is provided through circuit VH301 (YE/BU) from the blower control module. Ground for the blower control module is provided by circuit GD111 (BK/BU). The HVAC module - DATC sends a Pulse-Width Modulation (PWM) signal to the blower control module through circuit VH101 (WH/VT) to control the blower speed.

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. Blower motor control module
4. HVAC module - DATC

Scheme 98

Scheme 99

Scheme 100

1. R1 VERIFY THE BLOWER MOTOR OPERATION Key in ON position. Press the PANEL button on the HVAC module - DATC. 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 R2 . If the blower motor is always ON, go to R5 . NO : Go to «Pinpoint Test Q»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__pinpoint-test-q-the-blower-motor) .
2. R2 CHECK CIRCUIT VH301 (YE/BU) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Blower Motor Speed Control C271 Key in ON position. Does the blower motor operate? YES : REPAIR circuit VH301 (YE/BU) for a short to ground. TEST the system for normal operation. NO : Go to R3 .
3. R3 CHECK CIRCUIT VH101 (WH/VT) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: HVAC Module - DATC C228b Key in ON position. Measure the voltage between blower motor speed control C271-3, circuit VH101 (WH/VT), harness side and ground. Is any voltage present? YES : REPAIR circuit VH101 (WH/VT) for a short to voltage. TEST the system for normal operation. NO : Go to R4 .
4. R4 CHECK CIRCUIT VH101 (WH/VT) FOR AN OPEN Key in OFF position. Measure the resistance between blower motor speed control C271-3, circuit VH101 (WH/VT), harness side and HVAC module - DATC C228b-16, circuit VH101 (WH/VT), harness side. Is the resistance less than 5 ohms? YES : INSTALL a new blower motor speed control. TEST the system for normal operation. NO : REPAIR circuit VH101 (WH/VT) for an open. TEST the system for normal operation.
5. R5 CHECK CIRCUIT CH123 (VT/GN) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Blower Motor Relay Disconnect: HVAC Module - DATC C228a Measure the resistance between blower motor relay socket pin 86, circuit CH123 (VT/GN) and ground. Is the resistance greater than 10,000 ohms? YES : Go to R6 . NO : REPAIR circuit CH123 (VT/GN) for a short to ground. TEST the system for normal operation.
6. R6 CHECK CIRCUIT CH402 (YE/GN) 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 CH402 (YE/GN), harness side and ground. Is any voltage present? YES : REPAIR circuit CH402 (YE/GN) 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, go to R7 .
7. R7 CHECK THE MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test S: The Auxiliary Blower Motor is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Auxiliary Climate Control for schematic and connector information.

Under normal operation, the auxiliary blower motor relay coil receives ignition voltage through circuit SBB31 (WH/RD). The coil receives ground from the HVAC module - Dual Automatic Temperature Control (DATC) through circuit CH112 (VT/WH) if any auxiliary blower speed but OFF is selected. Voltage is supplied to the relay switch contact through circuit CBP45 (YE). When the relay coil is energized, voltage is delivered to the blower motor through circuit CHA02 (BN/GN). Ground for the blower motor is provided through circuit CHA03 (GY/OG) from the blower motor resistor. The blower resistor is grounded through circuit GD147 (BK/VT).

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. Auxiliary blower motor
4. Auxiliary blower motor relay 1
5. Auxiliary blower motor resistor

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

1. S1 CHECK CIRCUIT CHA02 (BN/GN) 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 CHA02 (BN/GN), harness side and ground. Is the voltage greater than 10 volts? YES : Go to S6 . NO : Go to S2 .
2. S2 CHECK CIRCUIT SBB31 (WH/RD) 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 SBB31 (WH/RD) and ground. Is the voltage greater than 10 volts? YES : Go to S3 . NO : VERIFY Battery Junction Box (BJB) fuse 31 (30A) is OK. If OK, REPAIR circuit SBB31 (WH/RD) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
3. S3 CHECK CIRCUIT CBP45 (YE) FOR VOLTAGE Measure the voltage between the auxiliary blower motor relay 1 socket pin 85, circuit CBP45 (YE) and ground. Is the voltage greater than 10 volts? YES : Go to S4 . NO : VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR circuit CBP45 (YE) for an open. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
4. S4 CHECK CIRCUIT CH112 (VT/WH) FOR GROUND Measure the resistance between the auxiliary blower motor relay 1 socket pin 86, circuit CH112 (VT/WH) 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 CHA02 (BN/GN) for an open. TEST the system for normal operation. NO : Go to S5 .
5. S5 CHECK CIRCUIT CH112 (VT/WH) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228b Measure the resistance between HVAC module - DATC C228b-2, circuit CH112 (VT/WH), harness side and auxiliary blower motor relay 1 socket pin 86, circuit CH112 (VT/WH). Is the resistance less than 5 ohms? YES : Go to S8 . NO : REPAIR circuit CH112 (VT/WH) for an open. TEST the system for normal operation.
6. S6 CHECK CIRCUIT CHA03 (GY/OG) FOR GROUND Key in OFF position. Measure the resistance between auxiliary blower motor C3021-2, circuit CHA03 (GY/OG), harness side 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 S7 .
7. S7 CHECK CIRCUIT GD147 (BK/VT) FOR GROUND Key in OFF position. Disconnect: Auxiliary Blower Motor Resistor C3022 Measure the resistance between auxiliary blower motor resistor C3022-2, circuit GD147 (BK/VT), harness side and ground. Is the resistance less than 5 ohms? YES : CARRY OUT the component test on the auxiliary blower motor resistor. If OK, REPAIR circuit CHA03 (GY/OG) for an open between the auxiliary blower motor and splice S396. TEST the system for normal operation. NO : REPAIR circuit GD147 (BK/VT) for an open. TEST the system for normal operation.
8. S8 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test T: The Auxiliary Blower Motor Does Not Operate Correctly

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Auxiliary Climate Control for schematic and connector information.

Under normal operation, ground for the blower motor is provided through circuit CHA03 (GY/OG) from the blower motor resistor. The blower resistor is grounded through circuit GD147 (BK/VT). The blower motor speed relay coils are supplied through circuit CBP45 (YE). Blower motor speed is received by the HVAC module - Dual Automatic Temperature Control (DATC) from the rear auxiliary control through circuit VHA17 (VT/GN). Reference voltage for the blower speed selector resistor is provided by the HVAC module - DATC through circuit LH111 (BN/WH). When the relay 1 coil is energized, voltage is delivered to the blower motor through circuit CHA02 (BN/GN). The auxiliary blower motor relay coil receives ground from the HVAC module - DATC through circuit CH112 (VT/WH) 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 HVAC module - DATC through circuit CH114 (GN/WH). Blower motor ground circuit CHA03 (GY/OG) is connected through one half of the blower motor resistor to circuit CHA04 (GN/WH). Circuit CHA04 (GN/WH) is connected through blower motor speed relay 3 to the blower motor resistor through circuit ZA110 (OG/YE). The blower resistor is grounded through circuit GD147 (BK/VT).

In MED-HI, blower motor relay 2 is grounded by the HVAC module - DATC through circuit CH113 (VT/GY). Blower motor ground circuit CHA03 (GY/OG) is connected through blower motor speed relay 2 to circuit CHA04 (GN/WH). Circuit CHA04 (GN/WH) is connected through one half of the blower motor resistor to the blower motor resistor to ground circuit GD147 (BK/VT).

In HI, blower motor speed relays 2 and 3 are grounded by the HVAC module - DATC through circuit CH114 (GN/WH) and CH113 (VT/GY). Blower motor ground circuit CHA03 (GY/OG) is connected through blower motor speed relay 2 to circuit CHA04 (GN/WH). Circuit CHA04 (GN/WH) is connected through blower motor speed relay 3 to the blower motor resistor ground circuit GD147 (BK/VT) by circuit ZA110 (OG/YE).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Auxiliary blower motor relay
3. Auxiliary blower motor speed relay 1
4. Auxiliary blower motor speed relay 2
5. Auxiliary blower motor speed relay 3
6. Auxiliary blower motor resistor
7. HVAC module - DATC

Scheme 107

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

1. T1 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 relay 1. If OK, go to T2 . NO : Go to T4 .
2. T2 CHECK CIRCUIT CHA02 (BN/GN) 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 auxiliary blower motor relay 1 socket pin 87, circuit CHA02 (BN/GN) and ground. Is any voltage present? YES : REPAIR circuit CHA02 (BN/GN) for a short to voltage. TEST the system for normal operation. NO : Go to T3 .
3. T3 CHECK CIRCUITS CH112 (VT/WH) FOR A SHORT TO GROUND Key in OFF position. Disconnect: HVAC Module - DATC C228b Measure the resistance between ground and auxiliary blower motor relay 1 socket pin 86, circuit CH112 (VT/WH). Is the resistance greater than 10,000 ohms? YES : Go to T14 . NO : REPAIR circuit CH112 (VT/WH) for a short to ground. TEST the system for normal operation.
4. T4 CHECK AUXILIARY BLOWER MOTOR OPERATION Select all auxiliary blower speeds. Is the auxiliary blower motor always one speed? YES : Go to T5 . NO : Go to T6 .
5. T5 CHECK CIRCUIT CHA03 (GY/OG) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Auxiliary Blower Motor Resistor C3022 Measure the resistance between auxiliary blower motor relay 2 socket pin 87, circuit CHA03 (GY/OG) and ground. Is the resistance greater than 10,000 ohms? YES : Go to T14 . NO : REPAIR circuit CHA03 (GY/OG) for a short to ground. TEST the system for normal operation.
6. T6 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. If OK, REPAIR circuit CHA03 (GY/OG) 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 T7 .
7. T7 CHECK CIRCUIT CBP45 (YE) FOR VOLTAGE Key in OFF position. Disconnect: Auxiliary Blower Motor Speed Relay 2 and 3 Key in ON position. Measure the voltage between auxiliary blower motor relay 2 and 3 socket pin 85, circuit CBP45 (YE) and ground. Is the voltage greater than 10 volts? YES : Go to T8 . NO : REPAIR circuit CBP45 (YE) for an open. TEST the system for normal operation.
8. T8 CHECK CIRCUITS CH114 (GN/WH) AND CH113 (VT/GY) FOR A SHORT TO GROUND Key in OFF position. Disconnect: HVAC Module - DATC C228b Measure the resistance between ground and: auxiliary blower motor relay 2 socket pin 86, circuit CH113 (GN/WH). auxiliary blower motor relay 3 socket pin 86, circuit CH114 (VT/GY). Are the resistances greater than 10,000 ohms? YES : Go to T9 . NO : REPAIR circuit CH114 (GN/WH) or CH113 (VT/GY) for a short to ground. TEST the system for normal operation.
9. T9 CHECK CIRCUITS CH114 (GN/WH) AND CH113 (VT/GY) FOR AN OPEN Measure the resistance between: HVAC module - DATC C228b-1, circuit CH114 (GN/WH), harness side and auxiliary blower motor relay 3 socket pin 86, circuit CH114 (GN/WH). HVAC module - DATC C228b-14, circuit CH113 (VT/GY), harness side and auxiliary blower motor relay 2 socket pin 86, circuit CH113 (VT/GY). Are the resistances less than 5 ohms? YES : Go to T10 . NO : REPAIR circuit CH114 (GN/WH) or CH113 (VT/GY) for an open. TEST the system for normal operation.
10. T10 CHECK CIRCUIT CHA04 (GN/WH) FOR AN OPEN Disconnect: Auxiliary Blower Motor Resistor C3022 Measure the resistance between auxiliary blower motor resistor C3022-1, circuit CHA04 (GN/WH), harness side and: auxiliary blower motor relay 2 socket pin 30, circuit CHA04 (GN/WH). auxiliary blower motor relay 3 socket pin 30, circuit CHA04 (GN/WH). Are the resistances less than 5 ohms? YES : Go to T11 . NO : REPAIR circuit CHA04 (GN/WH) for an open. TEST the system for normal operation.
11. T11 CHECK CIRCUIT CHA04 (GN/WH) FOR A SHORT TO GROUND Measure the resistance between ground and auxiliary blower motor relay 2 and 3 socket pin 86, circuit CHA04 (GN/WH). Is the resistance greater than 10,000 ohms? YES : Go to T12 . NO : REPAIR circuit CHA04 (GN/WH) for a short to ground. TEST the system for normal operation.
12. T12 CHECK CIRCUIT ZA110 (OG/YE) FOR AN OPEN Measure the resistance between auxiliary blower motor resistor C3022-3, circuit ZA110 (OG/YE), harness side and auxiliary blower motor relay 3 socket pin 87, circuit ZA110 (OG/YE). Is the resistance less than 5 ohms? YES : Go to T13 . NO : REPAIR circuit ZA110 (OG/YE) for an open. TEST the system for normal operation.
13. T13 CHECK CIRCUITS CHA04 (GN/WH), ZA110 (OG/YE) AND CHA03 (GY/DG) FOR A SHORT TOGETHER Measure the resistance between auxiliary blower motor resistor: C3022-4, circuit CHA03 (GY/DG), harness side and auxiliary blower motor resistor C3022-1, circuit CHA04 (GN/WH), harness side. C3022-4, circuit CHA03 (GY/DG), harness side and auxiliary blower motor resistor C3022-3, circuit ZA110 (OG/YE), harness side. C3022-1, circuit CHA04 (GN/WH), harness side and auxiliary blower motor resistor C3022-3, circuit ZA110 (OG/YE), harness side. Are the resistances greater than 10,000 ohms? YES : REPAIR circuit CHA03 (GY/OG) for an open between auxiliary blower motor relay 2 and the auxiliary blower motor resistor. TEST the system for normal operation. NO : REPAIR circuit CHA04 (GN/WH), ZA110 (OG/YE) or CHA03 (GY/OG) for a short together. TEST the system for normal operation.
14. T14 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test U: The Auxiliary Temperature Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Auxiliary Climate Control for schematic and connector information.

Under normal operation, to rotate the mode door actuator clockwise, the HVAC module - Dual Automatic Temperature Control (DATC) supplies voltage to the auxiliary temperature door actuator through circuit CH245 (BU/BN), and supplies ground through circuit CH244 (GY). To rotate the auxiliary temperature door actuator counterclockwise, the HVAC module - DATC reverses the voltage and ground circuits.

The auxiliary temperature door actuator feedback resistor is supplied a ground from the HVAC module - DATC through circuit RH111 (GY/BN) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module - DATC reads the voltage on the auxiliary temperature door actuator feedback circuit VHA09 (VT/BN) to determine the auxiliary temperature door actuator position by the position of the actuator feedback resistor wiper arm.

1. DTC B2916 Rear Blend Door Circuit Failure - The module senses an open/short in the feedback circuit or no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Auxiliary temperature door actuator
3. HVAC module - DATC
4. Stuck or bound linkage or door

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

1. U1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: HVAC Module - DATC C228a Disconnect: HVAC Module - DATC C228b Disconnect: Auxiliary Climate Controls C990 Measure the resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH) and HVAC module - DATC C228a-10, circuit RH111 (GY/BU). Is the resistance greater than 500 ohms? YES : Go to U2 . NO : CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. U2 CHECK POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE Measure the low-side resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side and HVAC module - DATC C228b-18, circuit VHA09 (VT/BN), harness side. Measure the high-side resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228b-18, circuit VHA09 (VT/BN), harness side. Are the resistances between 200 and 12,300 ohms? YES : Go to U3 . NO : If the low-side resistance only is greater than 12,300 ohms, CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the low-side resistance only is less than 200 ohms, CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VHA09 (VT/BN) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is greater than 12,300 ohms, CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is less than 200 ohms, CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VHA09 (VT/BN) and LH111 (BN/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side and low-side resistance is greater than 12,300 ohms, CARRY OUT the Auxiliary Temperature Door Actuator Component Test. If the actuator tests OK, REPAIR circuit VHA09 (VT/BN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. U3 CHECK CIRCUIT LH111 (BN/WH) OR VHA09 (VT/BN) FOR A SHORT TO GROUND Measure the resistance between ground and the following: HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side. HVAC module - DATC C228b-18, circuit VHA09 (VT/BN), harness side. Are the resistances greater than 10,000 ohms? YES : Go to U4 . NO : REPAIR circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. U4 CHECK CIRCUIT RH111 (GY/BN) OR VHA09 (VT/BN) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side. HVAC module - DATC C228b-18, circuit VHA09 (VT/BN), harness side. Is any voltage present? YES : REPAIR circuit(s) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to U5 .
5. U5 CHECK DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-13, circuit CH245 (BU/BN), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-12, circuit CH244 (GY), harness side. Remove the fused jumpers. Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side and HVAC module - DATC C228b-18, circuit VHA09 (VT/BN), harness side. Connect a fused jumper wire between: HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-13, circuit CH245 (BU/BN), harness side. HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-12, circuit CH244 (GY), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-13, circuit CH245 (BU/BN), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-12, circuit CH244 (GY), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to U7 . NO : Go to U6 .
6. U6 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test. Disconnect: Auxiliary Temperature Door Actuator C3275 Measure the resistance between HVAC module - DATC C228b-13, circuit CH245 (BU/BN), harness side and auxiliary temperature door actuator C3275-6, circuit CH245 (BU/BN), harness side. Measure the resistance between HVAC module - DATC C228b-12, circuit CH244 (GY), harness side and auxiliary temperature door actuator C3275-1, circuit CH244 (GY), harness side. Are the resistances less than 5 ohms? YES : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. NO : REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
7. U7 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test V: The Auxiliary Panel/Floor Control is Inoperative/Does Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Auxiliary Climate Control for schematic and connector information.

Under normal operation, to rotate the mode door actuator clockwise, the HVAC module - Dual Automatic Temperature Control (DATC) supplies voltage to the auxiliary panel/floor door actuator through the circuit CH243 (GY/BU), and supplies ground through circuit CH242 (VT/BN). To rotate the auxiliary panel/floor door actuator counterclockwise, the HVAC module - DATC reverses the voltage and ground circuits.

The auxiliary panel/floor door actuator feedback resistor is supplied a ground from the HVAC module - DATC through circuit RH111 (GY/BN) and a 5-volt reference voltage on circuit LH111 (BN/WH). The HVAC module - DATC reads the voltage on the auxiliary panel/floor door actuator feedback circuit VHA18 (YE/GN) to determine the auxiliary panel/floor door actuator position by the position of the actuator feedback resistor wiper arm.

1. DTC B2917 Rear Mode Door Circuit Failure - The module senses an open/short in the feedback circuit or no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Auxiliary panel/floor door actuator
3. HVAC module - DATC
4. Stuck or bound linkage or door

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

1. V1 CHECK THE FEEDBACK POTENTIOMETER TOTAL RESISTANCE Disconnect: HVAC Module - DATC C228a Disconnect: HVAC Module - DATC C228b Disconnect: Auxiliary Climate Controls C990 Measure the resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side. Is the resistance greater than 500 ohms? YES : Go to V2 . NO : CARRY OUT the Auxiliary Panel/Floor Door Actuator Component Test. If the actuator tests OK, REPAIR circuits LH111 (BN/WH) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
2. V2 CHECK POTENTIOMETER LOW- AND HIGH-SIDE RESISTANCE Measure the low-side resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side and HVAC module - DATC C228b-19, circuit VHA18 (YE/GN), harness side. Measure the high-side resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228b-19, circuit VHA18 (YE/GN), harness side. Are the resistances between 200 and 12,300 ohms? YES : Go to V3 . NO : If the low-side resistance only is greater than 12,300 ohms, CARRY OUT the Auxiliary Panel/Floor Door Actuator Component Test. If the actuator tests OK, REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the low-side resistance only is less than 200 ohms, CARRY OUT the Auxiliary Panel/Floor Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VHA18 (YE/GN) and RH111 (GY/BU) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is greater than 12,300 ohms, CARRY OUT the Auxiliary Panel/Floor Door Actuator Mode Door Actuator Component Test. If the actuator tests OK, REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side resistance only is less than 200 ohms, CARRY OUT the Auxiliary Panel/Floor Door Actuator Component Test. If the actuator tests OK, REPAIR circuits VHA18 (YE/GN) and LH111 (BN/WH) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the high-side and low-side resistance is greater than 12,300 ohms, CARRY OUT the Auxiliary Panel/Floor Door Actuator Component Test. If the actuator tests OK, REPAIR circuit VHA18 (YE/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. V3 CHECK CIRCUIT LH111 (BN/WH) OR VHA18 (YE/GN) FOR A SHORT TO GROUND Measure the resistance between ground and the following: HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side. HVAC module - DATC C228b-19, circuit VHA18 (YE/GN), harness side. Are the resistances greater than 10,000 ohms? YES : Go to V4 . NO : REPAIR circuit(s) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. V4 CHECK CIRCUIT RH111 (GY/BN) OR VHA18 (YE/GN) FOR A SHORT TO POWER Key in ON position. Measure the voltage between ground and the following: HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side. HVAC module - DATC C228b-19, circuit VHA18 (YE/GN), harness side. Are any voltages present? YES : REPAIR circuit(s) for a short to power. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : Go to V5 .
5. V5 CHECK DOOR ACTUATOR OPERATION NOTE: If a jumper fuse opens while carrying out this test step, repair the circuit(s) for a short. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-11, circuit CH243 (GY/BU), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-10, circuit CH242 (VT/BN), harness side. Remove the fused jumpers. Measure the low-side resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side and HVAC module - DATC C228b-19, circuit VHA18 (YE/GN), harness side. Connect a fused jumper wire between: HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-11, circuit CH243 (GY/BU), harness side. HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-10, circuit CH242 (VT/BN), harness side. Remove the fused jumpers. Connect a fused jumper wire between: HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and HVAC module - DATC C228b-11, circuit CH243 (GY/BU), harness side. HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side and HVAC module - DATC C228b-10, circuit CH242 (VT/BN), harness side. Does the resistance increase and decrease when the jumpers are connected? YES : INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found, go to V7 . NO : Go to V6 .
6. V6 CHECK THE ACTUATOR MOTOR DRIVE CIRCUITS FOR AN OPEN NOTE: Due to limited connector accessibility, before carrying out this test step, visually inspect the wiring between the HVAC module and actuator for opens or shorts. If no damage is visually evident, proceed with the test. Disconnect: Auxiliary Panel/Floor Door Actuator C3274 Measure the resistance between HVAC module - DATC C228b-11, circuit CH243 (GY/BU), harness side and auxiliary panel/floor door actuator C3274-6, circuit CH243 (GY/BU), harness side. Measure the resistance between HVAC module - DATC C228b-10, circuit CH242 (VT/BN), harness side and auxiliary panel/floor door actuator C3274-5, circuit CH242 (VT/BN), harness side. Are the resistances less than 5 ohms? YES : INSPECT for binding or broken linkage. REPAIR as necessary. If no condition is found, INSTALL a new door actuator. TEST the system for normal operation. NO : REPAIR the circuit(s) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
7. V7 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Pinpoint Test W: The Auxiliary Temperature, Panel/Floor and Blower Motor Controls are Inoperative/Do Not Operate Correctly Using the Front/Rear Auxiliary Climate Controls

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Auxiliary Climate Control for schematic and connector information.

Under normal operation, the panel/floor and cool/warm signal is received by the HVAC module - Dual Automatic Temperature Control (DATC) from the rear auxiliary control through circuit VHA15 (YE/GY). The blower speed signal is received by the HVAC module - DATC from the rear auxiliary control through circuit VHA17 (VT/GN). Reference voltage for the auxiliary controls signal resistor is provided by the HVAC module - DATC through circuit LH111 (BN/WH). Ground for the auxiliary controls signal resistor is provided by the HVAC module - DATC through circuit RH111 (GY/BN).

1. DTC B2918 Aux Temp Blend Input Circuit Failure - The module senses an open/short in the auxiliary temperature control input to the HVAC module - DATC circuit.
2. DTC B2919 Aux Blower Motor Speed Input Circuit Failure - The module senses an open/short in the auxiliary blower control input to the HVAC module - DATC circuit.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Rear auxiliary control
3. HVAC module - DATC

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

1. W1 CHECK HVAC DTCS Key in ON position. Check for HVAC DTCs. Is DTC B2918 or B2919 present? YES : One DTC present, go to W2 . Both DTCs present, go to W4 . NO : Go to W6 .
2. W2 CHECK CIRCUIT VHA15 (YE/GY) OR VHA17 (VT/GN) FOR AN OPEN Key in OFF position. Disconnect: Auxiliary Controls C990 Disconnect: HVAC Module - DATC C228b NOTE: For DTC B2918 only. Measure the resistance between HVAC module - DATC C228b-21, circuit VHA15 (YE/GY), harness side and auxiliary controls C990-4, circuit VHA15 (YE/GY), harness side. NOTE: For DTC B2919 only. Measure the resistance between HVAC module - DATC C228b-20, circuit VHA17 (VT/GN), harness side and auxiliary controls C990-2, circuit VHA17 (VT/GN), harness side. Are the resistances less than 5 ohms? YES : Go to W3 . NO : REPAIR circuit VHA15 (YE/GY) or VHA17 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
3. W3 CHECK CIRCUIT VHA15 (YE/GY) OR VHA17 (VT/GN) FOR A SHORT TO GROUND Measure the resistance between ground and HVAC module - DATC: For DTC B2918 only , C228b-21, circuit VHA15 (YE/GY), harness side. For DTC B2919 only , C228b-20, circuit VHA17 (VT/GN), harness side. Are the resistances greater than 10,000 ohms? YES : REPAIR circuit VHA15 (YE/GY) or VHA17 (VT/GN) for a short to circuit RH111 (GY/BN). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : REPAIR circuit VHA15 (YE/GY) or VHA17 (VT/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
4. W4 CHECK CIRCUITS RH111 (GY/BN) AND LH111 (BN/WH) FOR AN OPEN Key in OFF position. Disconnect: Auxiliary Controls C990 Disconnect: HVAC Module - DATC C228a Measure the resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and auxiliary controls C990-3, circuit LH111 (BN/WH), harness side. Measure the resistance between HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side and auxiliary controls C990-1, circuit RH111 (GY/BN), harness side. Is the resistance greater than 10,000 ohms? YES : Go to W5 . NO : REPAIR circuits RH111 (GY/BN) or LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
5. W5 CHECK CIRCUIT LH111 (BN/WH) FOR A SHORT TO GROUND Measure the resistance between ground and HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side. Is the resistance greater than 10,000 ohms? YES : INSTALL a new auxiliary control. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. NO : REPAIR circuit LH111 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
6. W6 CHECK CIRCUITS VHA15 (YE/GY) AND VHA17 (VT/GN) FOR A SHORT TO VOLTAGE Key in OFF position. Disconnect: Auxiliary Controls C990 Disconnect: HVAC Module - DATC C228b Key in ON position. Measure the voltage between HVAC module - DATC: C228b-20, circuit VHA17 (VT/GN), harness side. C228b-21, circuit VHA15 (YE/GY), harness side. Are any voltages present? YES : REPAIR circuit VHA15 (YE/GY) or VHA17 (VT/GN) for a short to voltage. TEST the system for normal operation. NO : Go to W7 .
7. W7 CHECK CIRCUIT RH111 (GY/BN) FOR A SHORT TO VOLTAGE Measure the voltage between ground and HVAC module - DATC C228a-10, circuit RH111 (GY/BN), harness side. Is any voltage present? YES : REPAIR circuit RH111 (GY/BN) for a short to voltage. TEST the system for normal operation. NO : Go to W8 .
8. W8 CHECK CIRCUITS RH111 (GY/BN) AND LH111 (BN/WH) FOR A SHORT TOGETHER Key in OFF position. Measure the resistance between HVAC module - DATC C228a-11, circuit LH111 (BN/WH), harness side and HVAC module - DATC C228a-10, circuit RH111 (GY/BU), harness side. Is the resistance greater than 500 ohms? YES : Go to W9 . NO : REPAIR circuits RH111 (GY/BN) and LH111 (BN/WH) for a short together. TEST the system for normal operation.
9. W9 CHECK CIRCUITS VHA15 (YE/GY) AND VHA17 (VT/GN) FOR A SHORT TOGETHER Measure the resistance between HVAC module - DATC C228b-21, circuit VHA15 (YE/GY), harness side and HVAC module - DATC C228b-20, circuit VHA17 (VT/GN), harness side. Is the resistance greater than 10,000 ohms? YES : INSTALL a new auxiliary control. TEST the system for normal operation. NO : REPAIR circuits VHA15 (YE/GY) and VHA17 (VT/GN) for a short together. TEST the system for normal operation.

Pinpoint Test X: DTC B1317 or B1318

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Automatic Climate Control System for schematic and connector information.

Note. DTCs B1317 or B1318 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.

Note. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Refer to Inspection and Verification .

Under normal operation, the HVAC module receives a ground through circuit GD111 (BK/BU). The HVAC module is supplied constant battery voltage through circuit SBP15 (WH/RD) and ignition switched voltage through circuit CBP37 (WH).

1. DTC B1317 Battery Voltage High - The module senses when battery voltage is greater than 16 volts.
2. DTC B1318 Battery Voltage Low - The module senses when battery voltage is less than 9 volts.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. HVAC module - Electronic Manual Temperature Control (EMTC)
3. HVAC module - Dual Automatic Temperature Control (DATC)

Scheme 138

Scheme 139

Scheme 140

1. X1 RETRIEVE ALL Continuous Memory Diagnostic Trouble Codes (CMDTCs) IN ALL MODULES Key in ON position. Enter the following diagnostic mode on the diagnostic tool: Self Test - All CMDTCs Is B1317, B1318 or B1676 present in one or more modules AND P0563, P0620, P0625, P0626 or P065B present in the PCM? YES : REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(/ford/taurus-x/i-2007-2009/remont/charging-system/#charging-system-general-information) article for diagnosis of the battery and charging system. NO : Go to X2 .
2. X2 CHECK BATTERY CONDITION Key in OFF position. Refer to «BATTERY, MOUNTING AND CABLES»(/ford/taurus-x/i-2007-2009/remont/body-electrical/#battery-mounting-and-cables) article and carry out the Battery - Condition Test. Does the battery pass the condition test? YES : If the battery passed the condition test but required a recharge, REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(/ford/taurus-x/i-2007-2009/remont/charging-system/#charging-system-general-information) article to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation. If the battery passed the condition test and did not require a recharge, go to X3 . NO : INSTALL a new battery. CLEAR all continuous memory DTCs. TEST the system for normal operation.
3. X3 CHECK THE CHARGING SYSTEM VOLTAGE NOTE: Do not allow the engine RPM to increase above 2,000 RPM while performing this step or the generator may self excite and result in default charging system output voltage. If engine RPM has gone above 2,000 RPM, shut the vehicle OFF and restart the engine before performing this step. Start the engine. Measure the voltage of the battery: For DTC B1317, turn off all accessories and run the engine at 1,500 RPM for a minimum of 2 minutes. For DTC B1318, turn on headlights and HVAC fan on high and run engine at 1,500 RPM for a minimum of 2 minutes. Is the battery voltage between 13-15.2 volts? YES : For DTC B1318, go to X4 . For DTC B1317, INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. CLEAR all CMDTCs. REPEAT the self-test. NO : REFER to «CHARGING SYSTEM - GENERAL INFORMATION»(/ford/taurus-x/i-2007-2009/remont/charging-system/#charging-system-general-information) article to diagnose the charging system. CLEAR all CMDTCs. TEST the system for normal operation.
4. X4 CHECK CIRCUITS SBP15 (WH/RD) AND CBP37 (WH) FOR AN OPEN Key in OFF position. Disconnect: HVAC Module - DATC C228a or EMTC C2357a Key in ON position. With the engine running, measure the voltage between HVAC module - EMTC C2357a-13 or HVAC module - DATC C228a-13, circuit SBP15 (WH/RD), harness side, HVAC module - EMTC C2357a-12 or HVAC module - DATC C228a-12, circuit CBP37 (WH), harness side and ground. Is the voltage greater than 10 volts? YES : Go to X5 . NO : VERIFY Smart Junction Box (SJB) fuse 15 (10A) and fuse 37 (10A) are OK. If OK, REPAIR circuit SBP15 (WH/RD) or CBP37 (WH) for an open. CLEAR all CMDTCs. REPEAT the self-test. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short.
5. X5 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between HVAC module - EMTC C2357a-23 or HVAC module - DATC C228a-23, circuit GD111 (BK/BU), harness side and ground. Repeat this measurement while wiggling the harness. Is the resistance less than 5 ohms? YES : Go to X6 . NO : REPAIR circuit GD111 (BK/BU) for an open. TEST the system for normal operation.
6. X6 CHECK MODULE CONNECTION Carry out the HVAC Module Cold Boot Process. Carry out the HVAC Module - Dual Automatic Temperature Control (DATC) On-Demand Self Test. Operate the system. Does the concern return? YES : INSTALL a new HVAC module - DATC. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Scheme 141

Resistor - Auxiliary Blower Motor

Scheme 142

Scheme 143

Temperature Sensor - Evaporator Discharge

Scheme 144

Scheme 145

Blend Door Actuator - Electronic Manual Temperature Control (EMTC)

Blend Door Actuator - Dual Automatic Temperature Control (DATC)

Auxiliary Temperature Door Actuator

Auxiliary Panel/Floor Door Actuator

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.

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 plug 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 bench test.

Heater Core - Bench Test

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. Refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .
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 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) Clutch Air Gap Adjustment

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

Fluorescent Dye Leak Detection

Special Tools Illustration Tool Name Tool Number Cordless/Rechargeable True UV LED Light ES 023-00182 or equivalent R-134a Leak Detection Dye 164-R6060 R-134a Loop/Add On Injector Kit-Set 219-00069 or equivalent R-134a Manifold Gauge Set 023-00047 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 023-00181 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 199-00067 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 265-00012 or equivalent

Scheme 146

Scheme 147

Fluorescent Dye Injection - Using an R-134a Refrigerant Management Machine 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 UV 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. This method of fluorescent dye injection requires the addition of R-134a from an R-134a Refrigerant Management Machine or R-134a Manifold Gauge Set hooked to an external tank to charge the dye into the refrigerant system. If adding fluorescent dye to a refrigerant system that is already fully charged, the R-134a Loop/Add On Injector Kit-Set method should be used.

Note. Before using the R-134a Loop/Add On Injector Kit-Set for the first time, refer to the manufacturer's instructions on evacuation of any non-condensable gasses from the hoses.

Note. Only connect the dye/lubricant injector from the R-134a Loop/Add On Injector Kit-Set when fluorescent dye is to be injected. The dye/lubricant injector has a one-way check valve that will prevent refrigerant system recovery and evacuation.

Note. Following fluorescent dye injection, the refrigerant system pressure should be between 413-551 kPa (60-80 psi) at 24°C (75°F) with the engine off and cool.

1. Connect an R-134a Refrigerant Management Machine or a R-134a Manifold Gauge Set to the refrigerant system service port valves.
2. Verify that the valves on the dye/lubricant injector from the R-134a Loop/Add On Injector Kit-Set are closed.
3. Fill the R-134a fluorescent dye injector reservoir with 7 ml (0.25 oz) of fluorescent dye.
4. Install the dye/lubricant injector between the low-pressure service gauge port valve and the R-134a Refrigerant Management Machine or R-134a 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 dye/lubricant injector.
8. Remove the dye/lubricant injector from the low-pressure service gauge port valve and the R-134a Refrigerant Management Machine or R-134a Manifold Gauge Set.

Fluorescent Dye Injection - Using an R-134a Loop/Add On Injector Kit-Set

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 UV 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 Loop/Add On Injector Kit-Set for the first time, refer to the equipment manufacturer's 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) with the engine off and cool.

1. Verify that the valves on the R-134a Loop/Add On Injector Kit-Set are closed.
2. Fill the R-134a Loop/Add On Injector Kit-Set reservoir with 7 ml (0.25 oz) of fluorescent dye.
3. Install the R-134a Loop/Add On Injector Kit-Set between the high-pressure and low-pressure service gauge port valves.
4. With the A/C off, start the engine. Allow engine speed to stabilize below 1,000 RPM.
5. Set the A/C to the ON position.
6. Open the high-pressure service valve.
7. Open the R-134a Loop/Add On Injector Kit-Set valves and inject the fluorescent dye into the refrigerant system.
8. Close the high-pressure service valve to allow the pressure inside the R-134a Loop/Add On Injector Kit-Set to equalize with the suction side of the refrigerant system.
9. Close the valves on the R-134a Loop/Add On Injector Kit-Set.
10. Disconnect the high-pressure and low-pressure service valves and remove the R-134a Loop/Add On Injector Kit-Set from the vehicle.

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.

1. Check for leaks using a Rotunda-approved UV lamp and dye enhancing glasses. 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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .
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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .
5. After the leak(s) is 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.

Electronic Leak Detection

Special Tools Illustration Tool Name Tool Number Heated Pentode Halogen Leak Detector 023-00178 or equivalent

Note. Good ventilation is necessary in the area where electronic A/C leak testing is to be carried out. If the surrounding air is contaminated with refrigerant gas, the Heated Pentode Halogen Leak Detector will indicate this gas all the time. Odors from other chemicals such as antifreeze, diesel fuel, disc brake cleaner or other cleaning solvents can cause the same problem. Using a fan to ventilate the area to be tested before proceeding with the leak detection procedure is helpful in removing small traces of contamination from the air, but the fan should be turned off during actual testing.

Note. R-134a is heavier than air, and will tend to move downward from the source of the leak if present. It is possible that a leak may not be detected if the leak detector tip is held above the leaking fitting, line or component. Always be sure to thoroughly leak test below the fitting, line or component for the presence of R-134a as well as leak testing above and around.

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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) . Repair the system. Test the system for normal operation.

Air Conditioning (A/C) System Flushing

Special Tools Illustration Tool Name Tool Number A/C Flush Adapter Kit 219-00074 or equivalent A/C Flush and Purge Fitting Kit 219-00024 (part of 219-00023) or equivalent A/C Flush and Purge Machine 219-00022 (part of 219-00023) or equivalent

Scheme 148

Material

Note. An air conditioning (A/C) refrigerant analyzer must be used before the recovery of any vehicle's A/C refrigerant. Failure to do so puts the shop's bulk refrigerant at risk of contamination. If the vehicle's A/C refrigerant is contaminated, refer the customer to the service facility that carried out the last A/C service. If the customer wishes to pay the additional cost, use the A/C recovery equipment that is designated for recovering contaminated A/C refrigerant. All contaminated A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow the equipment manufacturer procedures and instructions.

Note. Suction accumulator or receiver/drier, Thermostatic Expansion Valve (TXV) and/or evaporator core orifice, and hoses with mufflers, should be removed when flushing the air conditioning (A/C) system. Internal plumbing of these devices makes it impossible to correctly remove any residual-flushing agent. These components are typically discarded after A/C system contamination. Hoses without mufflers can normally be reused unless they are clogged with foreign material. The 3.785L (1 gal) of A/C System Flushing Solvent YN-23 and FL1-A filter used in A/C Flush and Purge Machine 219-00022 are intended for use on one vehicle only. They may be used to flush both the A/C condenser core and the A/C evaporator core on an individual vehicle, but under no circumstances should they be used on more than one vehicle.

Note. Only the A/C Flush and Purge Machine 219-00022, A/C Flush and Purge Fitting Kit 219-00024, A/C Flush Adapter Kit 219-00074 and A/C System Flushing Solvent are approved for use on Ford vehicles. No other flushing device or solvent is approved for flushing heat exchangers (air conditioning [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. Prior to using the A/C Flush and Purge Machine 219-00022 for the first time, review the operating instructions.

Note. Ford Motor Company has approved a procedure to provide technicians with a non-Chlorofluorocarbons (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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .
2. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
3. Using the correct adapters from the A/C Flush Adapter Kit or A/C Flush and Purge Fitting Kit, connect the A/C Flush and Purge Machine to the heat exchanger to be flushed. Do not flush through the evaporator core orifice (if equipped), Thermostatic Expansion Valve (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 air to 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), receiver/drier (if equipped) or receiver/drier cartridge (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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .

Air Conditioning (A/C) System Recovery, Evacuation and Charging

Special Tools Illustration Tool Name Tool Number 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 R-134a Manifold Gauge Set 023-00047 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 023-00181 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 199-00067 or equivalent R-134a Refrigerant Management Machine (SAE J-2788 Compliant) 265-00012 or equivalent

Material

Refrigerant System Recovery

Note. An air conditioning (A/C) refrigerant analyzer must be used before the recovery of any vehicle's A/C refrigerant. Failure to do so puts the shop's bulk refrigerant at risk of contamination. If the vehicle's A/C refrigerant is contaminated, refer the customer to the service facility that carried out the last A/C service. If the customer wishes to pay the additional cost, use the A/C recovery equipment that is designated for recovering contaminated A/C refrigerant. All contaminated A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow the equipment manufacturer procedures and instructions.

Note. Ford Motor Company recommends use of an R-134a Refrigerant Management Machine to carry out recovery. If an R-134a Refrigerant Management Machine is not available, refrigerant system recovery may be accomplished using a separate recovery station.

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, the purity of the refrigerant must be verified. For additional information, refer to «Refrigerant Identification Testing»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__refrigerant-identification-testing) .
2. Connect an R-134a Refrigerant Management Machine 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. Note the amount of oil removed during the refrigerant recovery (if any). Add that same amount back into the system once repairs are complete.
4. Once the R-134a Refrigerant 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 Refrigerant Management Machine

Note. Ford Motor Company recommends use of an R-134a Refrigerant Management Machine to carry out recovery, evacuation and charging of the refrigerant system. If an R-134a Refrigerant Management Machine is not available, evacuation may be accomplished using a separate Vacuum Pump and R-134a 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 Refrigerant Management Machine 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 R-134a Refrigerant Management Machine to carry out evacuation of the refrigerant system. If an R-134a Refrigerant Management Machine is not available, refrigerant system evacuation may be accomplished using a separate Vacuum Pump and R-134a 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 R-134a 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 R-134a 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 Refrigerant Management Machine

Note. Ford Motor Company recommends use of an R-134a Refrigerant Management Machine to carry out charging of the refrigerant system. If an R-134a Refrigerant Management Machine is not available, refrigerant system charging may be accomplished using a separate Automatic Refrigerant Charging Meter and R-134a 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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__refrigerant-oil-adding) .
2. Connect an R-134a Refrigerant Management Machine 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 Using an R-134a Manifold Gauge Set and Automatic Refrigerant Charging Motor

Note. Ford Motor Company recommends use of an R-134a Refrigerant Management Machine to carry out charging of the refrigerant system. If an R-134a Refrigerant Management Machine is not available, refrigerant system charging may be accomplished using a separate Automatic Refrigerant Charging Meter and R-134a 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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__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 MAX A/C operation and allow the refrigerant charge to complete.

Refrigerant Oil Adding

Special Tools Illustration Tool Name Tool Number R-134a Loop/Add On Injector Kit-Set 219-00069 or equivalent

Material

Note. During normal A/C operation, oil is circulated through the system with the refrigerant, and a small amount is retained in each component. If certain components of the system are removed, some of the PAG oil will go with the component. To maintain the original total oil charge, it is necessary to compensate for the oil lost by adding oil to the system with the new part.

1. Refer to the chart below for refrigerant oil adding amounts and methods of installation. Component PAG Oil Amount Method of Adding A/C Compressor See heading below Add directly to A/C compressor low-side port 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 (TXV) 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 a 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 b 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. a If an excessive amount of PAG oil is lost due to a hose rupture/separation or other damage, the total system refrigerant oil capacity must be added. b The amount specified may be used for one or multiple O-ring leak repairs. Do not multiply the PAG oil amount by the number of O-ring leaks being repaired.

Refrigerant Oil Adding for New A/C Compressor Installation

Note. This PAG oil adding method is to be used when a new A/C compressor only has been installed. If a new suction accumulator or receiver drier and evaporator core orifice or Thermostatic Expansion Valve (TXV) have also been installed due to system contamination, refer to the appropriate heading.

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 plus 30 ml (1 fl oz).

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

Note. This refrigerant oil adding method is to be used when a new suction accumulator or receiver drier only has been installed. If a new A/C compressor and evaporator core orifice or TXV have also been installed due to system contamination, refer to the appropriate heading.

1. Drill one 12.7 mm (1/2 in) 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).

Refrigerant Oil Adding for Multiple Component Installation After A/C System Contamination

Note. This refrigerant oil adding method is to be used when a new A/C compressor, suction accumulator or receiver drier and evaporator core orifice or TXV have been installed due to system contamination and the A/C system has been flushed.

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

1. Add 60 ml (2 fl oz) directly to the new A/C compressor suction port.
2. Inject the total vehicle PAG oil capacity minus 60 ml (2 fl oz) to the low-side service port during system charging. For the total PAG oil capacity specification, refer to «SPECIFICATIONS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) .

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, from the R-134a Loop/Add On Injector Kit-Set, along with the PAG oil.

1. Evacuate the refrigerant system. For additional information, refer to «Air Conditioning (A/C) System Recovery, Evacuation and Charging»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .
2. Assemble the dye/lubricant injector and the correct adapters from the R-134a Loop/Add On Injector Kit-Set 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/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics__air-conditioning-ac-system-recovery-evacuation) .

Refrigerant Identification Testing

Special Tools Illustration Tool Name Tool Number Refrigerant Identifier with Air-Radiator 198-00003 or equivalent

Refrigerant Identification

1. Follow the instructions included with the Refrigerant Identifier with Air-Radiator to obtain the sample for testing.
2. The Refrigerant Identifier with Air-Radiator will display one of the following: If the purity level of R-134a is 98% or greater by weight, the green PASS 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. If contaminated refrigerant is detected, DO NOT recover the refrigerant into R-134a recovery/recycling equipment. Recovery of contaminated refrigerant will contaminate the recovered refrigerant supply and may damage the recovery/recycling equipment.

Note. A new suction accumulator or receiver/drier must be installed as directed by the A/C 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 the area with the correct equipment to carry out this service.
2. Determine and correct the cause of the customers initial concern.
3. Flush the A/C system.
4. Dispose of the contaminated refrigerant in accordance with all federal, state and local regulations.

Air Conditioning (A/C) Odor Treatment

Special Tools Illustration Tool Name Tool Number Flexible Applicator Tool 258-00004

Material

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: foam seals. rubber seals. adhesives. standing water. water soaked carpet/trim.

See also:
• GLASS, FRAMES AND MECHANISMS
• SEATING
• MODULE COMMUNICATIONS NETWORK
• MULTIFUNCTION ELECTRONIC MODULES
• Introduction - Gasoline Engines
• CLIMATE CONTROL
• INSTRUMENT CLUSTER AND PANEL ILLUMINATION
• NOISE, VIBRATION AND HARSHNESS
• ENGINE COOLING
• CHARGING SYSTEM - GENERAL INFORMATION
• BATTERY, MOUNTING AND CABLES
• PCM DTC Table
• HVAC Module DTC Table
• Symptom Chart - Climate Control Systems
• Pinpoint Test I
• Pinpoint Test H
• Pinpoint Test C
• Pinpoint Test D
• Pinpoint Test X
• Pinpoint Test N
• Pinpoint Test E
• Pinpoint Test F
• Pinpoint Test U
• Pinpoint Test V
• Pinpoint Test W
• Pinpoint Test G
• Pinpoint Test L
• Pinpoint Test P
• Pinpoint Test R
• Pinpoint Test K
• Pinpoint Test M
• Pinpoint Test O
• Pinpoint Test Q
• Pinpoint Test S
• Pinpoint Test T
• Air Conditioning (A/C) Clutch Air Gap Adjustment
• Fluorescent Dye Leak Detection
• Inspection and Verification
• Air Conditioning (A/C) System Recovery, Evacuation and Charging
• Refrigerant Oil Adding
• Refrigerant Identification Testing