Overview
| WARNING | Take the following precautions when repairing an air conditioning system containing R-134a: Always wear safety goggles. Avoid contact with liquid refrigerant R-134a. R-134a vaporizes at approximately -25°C (-13°F) under atmospheric pressure and will freeze skin tissue. Never allow refrigerant R-134a gas to escape in quantity in an occupied space. It will displace the oxygen needed to support life. Never use a torch in an atmosphere containing R-134a gas. R-134a is non-toxic at all normal conditions, but it decomposes when exposed to high temperatures such as a torch flame. During decomposition it releases irritating and toxic gasses (as described in the Material Safety Data Sheet from the manufacturer). Decomposition products are hydrofluoric acid, carbon dioxide and water. Failure to follow these instructions may result in serious personal injury. |
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 ASE, MACS. 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 DATC system maintains the selected vehicle interior temperature by heating and/or cooling the air depending on the HVAC control panel selection.
- During A/C operation, the system reduces the relative humidity of the air inside the vehicle.
- The driver may override the automatic mode of operation.
- The temperature control setting is the desired cabin air temperature.
- The blower motor control override buttons vary the blower motor speed.
- The driver side and passenger side temperature settings can be individually controlled.
Scheme 155
Diagnostic Overview
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Normal Operation and Fault Conditions
Refer to AIR CONDITIONING (A/C) PRESSURE TRANSDUCER in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0532 | A/C Refrigerant Pressure Sensor A Circuit Low | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is lower than expected. |
| P0533 | A/C Refrigerant Pressure Sensor A Circuit High | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is greater than expected. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Voltage is provided to the A/C clutch relay coil. 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, energizing the A/C clutch relay. Refer to A/C REQUEST in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0645 | A/C Clutch Relay Control Circuit | The DTC sets when the PCM grounds the relay circuit and more current than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and no voltage is detected on the relay circuit. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
The externally controlled variable displacement compressor is electronically controlled by the PCM. The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P06A0 | Variable A/C Compressor Control Circuit | This DTC sets when the PCM senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to the IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A61:00 | Cabin Temperature Sensor: No Sub Type Information | This DTC sets when the HVAC module senses unexpected voltage on the circuit for the cabin temperature sensor. |
| B105A:00 | Cabin Temperature Sensor Fan: No Sub Type Information | This DTC sets when the HVAC module senses unexpected voltage on the circuit for the cabin temperature sensor fan. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to the IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A69:00 | Humidity Sensor: No Sub Type Information | This DTC sets when the HVAC module senses unexpected voltage on the circuit for the humidity sensor. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to A/C COMPRESSOR CYCLING in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor: Signal Amplitude < Minimum | This DTC sets when the BCM senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1B71:22 | Evaporator Temperature Sensor: Signal Amplitude > Maximum | This DTC sets when the BCM senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
| B1B71:2F | Evaporator Temperature Sensor: Signal Erratic | This DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to TEMPERATURE BLEND DOOR ACTUATOR - RH in Climate Control System.
During an actuator calibration cycle, the HVAC module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be the expected temperature.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1082:00 | Right Temperature Damper Motor: No Sub Type Information | This DTC sets when the HVAC module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
The purpose of this pinpoint test is to test the functions of the HVAC system and to identify the correct HVAC symptom pinpoint test.
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to MODE DOOR ACTUATOR - AIR INLET DOOR in Climate Control System.
During an actuator calibration cycle, the HVAC module drives the air inlet mode door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the air intake may not be from the expected source.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1083:00 | Recirculation Damper Motor: No Sub Type Information | This DTC sets when the HVAC module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
REFER to MODE DOOR ACTUATOR - DEFROST DOOR or PANEL-FLOOR DOOR in Climate Control System
During an actuator calibration cycle, the HVAC module drives the defrost mode door or the panel/floor mode door until the door reaches the internal stops in the HVAC case. If either mode door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1085:00 | Defroster Damper Motor: No Sub Type Information | This DTC sets when the HVAC module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
| B1086:00 | Air Distribution Damper Motor: No Sub Type Information | This DTC sets when the HVAC module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Warm coolant flows from the engine through the heater core and back to the engine. Proper coolant temperatures are critical for good heater performance.
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to A/C REQUEST in Climate Control System.
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to A/C COMPRESSOR CYCLING in Climate Control System.
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to A/C REQUEST in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1464 | A/C Demand Out Of Self Test Range | This DTC sets when the PCM senses an A/C request during a PCM self-test. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to TEMPERATURE BLEND DOOR ACTUATOR - LH in Climate Control System.
During an actuator calibration cycle, the HVAC module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be the expected temperature.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1081:00 | Left Temperature Damper Motor: No Sub Type Information | This DTC sets when the HVAC module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to AIR HANDLING in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:13 | Blower Fan Relay: Circuit Open | This DTC sets when the BCM senses no voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:19 | Blower Fan Relay: Circuit Current Above Threshold | This DTC sets when the BCM senses excessive voltage on the relay coil ground circuit when the module is grounding the circuit. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
Refer to AIR HANDLING in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:11 | Blower Fan Relay: Circuit Short to Ground | This DTC sets when the BCM senses a ground on the blower motor relay coil control circuit when the relay is not grounded by the module. |
| B10B9:00 | Blower Control: No Sub Type Information | This DTC sets when the HVAC module senses incorrect voltage on the blower motor control PWM circuit. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to CLIMATE CONTROL SYSTEM NETWORK COMMUNICATION in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0140:00 | Lost Communication With Body Control Module: No Sub Type Information | This DTC sets in the HVAC module if data messages received from the BCM over the MS-CAN are missing for 5 seconds or more. For a complete list of all network messages, refer to MODULE COMMUNICATIONS NETWORK . |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to CLIMATE CONTROL SYSTEM NETWORK COMMUNICATION in Climate Control System.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0155:00 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information | This DTC sets in the HVAC module if data messages received from the IPC over the MS-CAN are missing for 5 seconds or more. For a complete list of all network messages, refer to MODULE COMMUNICATIONS NETWORK . |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
The HVAC module is supplied constant battery voltage and ground.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U3006:16 | Control Module Input Power "A": Circuit Voltage Below Threshold | This DTC sets when the HVAC module senses lower than expected system voltage. |
| U3006:17 | Control Module Input Power "A": Circuit Voltage Above Threshold | This DTC sets when the HVAC module senses greater than expected system voltage. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
The autolamp/sunload sensor supplies information to the HVAC module indicating the intensity of the sun on the vehicle and the HVAC module adjusts the system based on the intensity.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A63:00 | Right Solar Sensor: No Sub Type Information | This DTC sets when the HVAC module senses an open, short to voltage or short to ground from the sunload sensor feedback circuit. |
| B1A64:00 | Left Solar Sensor: No Sub Type Information | This DTC sets when the HVAC module senses an open, short to voltage or short to ground from the sunload sensor feedback circuit. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS in SERVICE INFORMATION for information about these practices.
Refer to SYSTEM WIRING DIAGRAMS - Automatic Climate Control System for additional information.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10B3:00 | Right Panel Air Discharge Temperature: No Sub Type Information | This DTC sets when the HVAC module senses erratic voltages from the right panel air discharge temperature sensor. |
| B10B4:00 | Right Floor Air Discharge Temperature: No Sub Type Information | This DTC sets when the HVAC module senses erratic voltages from the right floor air discharge temperature sensor. |
| B10B5:00 | Left Panel Air Discharge Temperature: No Sub Type Information | This DTC sets when the HVAC module senses erratic voltages from the left panel air discharge temperature sensor. |
| B10B6:00 | Left Floor Air Discharge Temperature: No Sub Type Information | This DTC sets when the HVAC module senses erratic voltages from the left floor air discharge temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
Refrigerant Identification Testing
SPECIAL TOOLS Refrigerant Blend Identifier with Printer 198-00012 or equivalent
Scheme 156
Refrigerant Identification
- NOTE: A Refrigerant Blend Identifier with Printer must be used to identify gas samples taken directly from the refrigeration system or storage containers prior to recovering or charging the refrigerant system. Follow the instructions included with the Refrigerant Blend Identifier with Printer to obtain the sample for testing.
- The Refrigerant Blend Identifier with Printer 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.
- The percentage of air contained in the sample will be displayed if the R-134a content is 98% or greater. The Refrigerant Blend Identifier with Printer 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 Refrigerant Blend Identifier with Printer 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, it will prompt the user if an air purge is desired.
- If contaminated refrigerant is detected, repeat the refrigerant identification test to verify that the refrigerant is indeed contaminated.