Climate Control - Datc: Overview Ford Explorer V

Overview

Failure to follow these instructions may result in serious personal injury .

Note. To avoid damaging the vehicle or 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 or 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 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 PAG 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.

1. During A/C operation, the system reduces the relative humidity of the air inside the vehicle.
2. The driver may override the automatic mode of operation.
3. The temperature control setting is the desired cabin 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.

Scheme 4

Normal Operation and Fault Conditions

The A/C pressure transducer receives a ground from the PCM. A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM. The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C refrigerant pressure.

DTC FAULT TRIGGER CONDITIONS

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.

DTC FAULT TRIGGER CONDITIONS

A 5-volt reference voltage is supplied to the sensors and actuators from the HVAC module.

DTC FAULT TRIGGER CONDITIONS

The in-vehicle temperature and humidity sensor receive a ground from the HVAC module. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls, the resistance rises. The HVAC module measures this resistance to determine the temperature at the sensor. The sensor DTCs set if there is a fault in either the temperature or humidity part of the sensor or circuits.

DTC FAULT TRIGGER CONDITIONS

Scheme 5

Scheme 6

Scheme 7

Scheme 8

1. CHECK THE IN-VEHICLE TEMPERATURE SENSOR RESISTANCE Ignition OFF. Disconnect: In-Vehicle Temperature Sensor. Carry out the in-vehicle temperature sensor component test. REFER to «In-Vehicle Temperature Sensor»(ref-517581-S40575426972012121200000) . Does the in-vehicle temperature sensor test OK? Yes: GO to 2 . No: INSTALL a new in-vehicle temperature sensor. REFER to «In-Vehicle Temperature Sensor»(ref-517581-S00510998232012121200000) .
2. CHECK THE HVAC MODULE OUTPUT VOLTAGE Ignition ON. Measure: In-Vehicle Temperature Sensor In-Vehicle Temperature Sensor C233 C233 Pin Circuit Measurement / Action Pin Circuit 1 VH414 (GN/BU) 3 RH111 (GY/BU) Is the voltage between 4.7 and 5.1 volts? Yes: INSTALL a new in-vehicle temperature sensor. REFER to «In-Vehicle Temperature Sensor»(ref-517581-S00510998232012121200000) . TEST the system for normal operation. If the DTC returns, GO to 8 . No: For DTC B1A61:11, GO to 6 . For DTC B1A61:15, GO to 3 .
3. CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228A. Disconnect: HVAC Module C228B. Measure: HVAC Module In-Vehicle Temperature Sensor C228B C233 Pin Circuit Measurement / Action Pin Circuit 29 VH414 (GN/BU) 1 VH414 (GN/BU) Is the resistance less than 3 ohms? Yes: GO to 4 . No: REPAIR the circuit.
4. CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN Measure: HVAC Module In-Vehicle Temperature Sensor C228A C233 Pin Circuit Measurement / Action Pin Circuit 23 RH111 (GY/BU) 3 RH111 (GY/BU) Is the resistance less than 3 ohms? Yes: GO to 5 . No: REPAIR the circuit.
5. CHECK THE SIGNAL RETURN CIRCUIT FOR SHORT TO VOLTAGE Measure: In-Vehicle Temperature Sensor Ground C233 Ground Pin Circuit Measurement / Action Pin Circuit 1 VH414 (GN/BU) - Ground Is any voltage present? Yes: REPAIR the circuit. No: GO to 8 .
6. CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT Ignition OFF. Disconnect: HVAC Module C228A. Disconnect: HVAC Module C228B. Measure: In-Vehicle Temperature Sensor In-Vehicle Temperature Sensor C233 C233 Pin Circuit Measurement / Action Pin Circuit 1 VH414 (GN/BU) 3 RH111 (GY/BU) Is the resistance greater than 10, 000 ohms? Yes: GO to 7 . No: REPAIR the circuits.
7. CHECK THE IN-VEHICLE TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND Measure: HVAC Module Ground C228B Ground Pin Circuit Measurement / Action Pin Circuit 29 VH414 (GN/BU) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 8 . No: REPAIR the circuit.
8. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «Heating Ventilation Air Conditioning (HVAC) Module»(ref-517581-S13895863382012121200000) . No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

As the light applied to the sensor changes, the HVAC module detects the change through the RH and LH feedback circuits.

DTC FAULT TRIGGER CONDITIONS

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

1. CHECK THE AUTOLAMP/SUNLOAD SENSOR REFERENCE VOLTAGE Ignition OFF. Disconnect: Autolamp/Sunload Sensor. Ignition ON. Press the AUTO button. For DTC B1A63:11 or B1A63:15, measure: Autolamp/Sunload Sensor Autolamp/Sunload Sensor C286 C286 Pin Circuit Measurement / Action Pin Circuit 1 VH417 (YE/OG) 4 GD215 (BK/GY) For DTC B1A64:11 or B1A64:15, measure: Autolamp/Sunload Sensor Autolamp/Sunload Sensor C286 C286 Pin Circuit Measurement / Action Pin Circuit 3 VH416 (VT/GY) 4 GD215 (BK/GY) Is the voltage between 4.7 and 5.1 volts? Yes: INSTALL a new autolamp/sunload sensor. No: If DTC B1A63:15 and DTC B1A64:15 are both set, GO to 2 . If diagnosing DTC B1A63:11 or DTC B1A64:11, GO to 5 . If diagnosing DTC B1A63:15 or DTC B1A64:15, GO to 3 .
2. CHECK THE AUTOLAMP/SUNLOAD SENSOR GROUND CIRCUIT FOR AN OPEN Ignition OFF. Disconnect: HVAC Module C228B. Measure: Autolamp/Sunload Sensor Ground C286 Ground Pin Circuit Measurement / Action Pin Circuit 4 GD215 (BK/GY) - Ground Is the resistance less than 3 ohms? Yes: INSTALL a new autolamp/sunload sensor. No: REPAIR the circuit.
3. CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR AN OPEN For DTC B1A63:15, measure: HVAC Module Autolamp/Sunload Sensor C228B C286 Pin Circuit Measurement / Action Pin Circuit 22 VH417 (YE/OG) 1 VH417 (YE/OG) For DTC B1A64:15, measure: HVAC Module Autolamp/Sunload Sensor C228B C286 Pin Circuit Measurement / Action Pin Circuit 23 VH416 (VT/GY) 3 VH416 (VT/GY) Is the resistance less than 3 ohms? Yes: GO to 4 . No: REPAIR the circuit.
4. CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO VOLTAGE For DTC B1A63:15, measure: Autolamp/Sunload Sensor Ground C286 Ground Pin Circuit Measurement / Action Pin Circuit 1 VH417 (YE/OG) - Ground For DTC B1A64:15, measure: Autolamp/Sunload Sensor Ground C286 C286 Pin Circuit Measurement / Action Pin Circuit 3 VH416 (VT/GY) 3 Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 6 . No: REPAIR the circuit.
5. CHECK THE AUTOLAMP/SUNLOAD SENSOR FEEDBACK CIRCUITS FOR A SHORT TO GROUND Ignition OFF. Disconnect: HVAC Module C228B. For DTC B1A64:11, measure: Autolamp/Sunload Sensor Ground C286 Ground Pin Circuit Measurement / Action Pin Circuit 3 VH416 (VT/GY) - Ground For DTC B1A63:11, measure: Autolamp/Sunload Sensor Ground C286 Ground Pin Circuit Measurement / Action Pin Circuit 1 VH417 (YE/OG) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 6 . No: REPAIR the circuit.
6. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «Heating Ventilation Air Conditioning (HVAC) Module»(ref-517581-S13895863382012121200000) . No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

The evaporator discharge air temperature sensor receives a ground from the HVAC module. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls, the resistance rises. The HVAC module measures this resistance to determine the temperature at the sensor.

The evaporator discharge air temperature sensor is used for A/C compressor cycling. An accurate evaporator temperature is critical to prevent evaporator icing. The HVAC module uses the temperature measurement to turn off the A/C compressor before the evaporator temperatures are cold enough to freeze the condensation. This prevents ice blockage of airflow over the evaporator core.

DTC FAULT TRIGGER CONDITIONS

Scheme 18

Scheme 19

Scheme 20

1. CHECK THE HVAC MODULE OUTPUT VOLTAGE Ignition ON. Press the POWER button on the HVAC controls. Measure: Evaporator Discharge Air Temperature Sensor Evaporator Discharge Air Temperature Sensor C296 C296 Pin Circuit Measurement / Action Pin Circuit 1 VH406 (VT/BN) 2 RH111 (BY/BU) Is the voltage between 4.7 and 5.1 volts? Yes: INSTALL a new evaporator discharge air temperature sensor. REFER to «Control Components - Exploded View»(ref-517581-S37343797002012121200000) . CLEAR the DTCs and REPEAT the self-test. If the DTC returns, GO to 7 . No: For DTC B1B71:11, GO to 5 . For DTC B1B71:15, GO to 2 .
2. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE Ignition OFF. Disconnect: HVAC Module C228A. Ignition ON. Measure: HVAC Module Ground C228A Ground Pin Circuit Measurement / Action Pin Circuit 19 VH406 (VT/BN) - Ground Is any voltage present? Yes: REPAIR the circuit. No: GO to 3 .
3. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR AN OPEN Ignition OFF. Measure: HVAC Module Evaporator Discharge Air Temperature Sensor C228A C296 Pin Circuit Measurement / Action Pin Circuit 19 VH406 (VT/BN) 1 VH406 (VT/BN) Is the resistance less than 3 ohms? Yes: GO to 4 . No: REPAIR the circuit.
4. CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN Measure: HVAC Module Evaporator Discharge Air Temperature Sensor C228A C296 Pin Circuit Measurement / Action Pin Circuit 23 RH111 (GY/BU) 2 RH111 (GY/BU) Is the resistance less than 3 ohms? Yes: GO to 7 . No: REPAIR the circuit.
5. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT Ignition OFF. Disconnect: HVAC Module C228A. Measure: Evaporator Discharge Air Temperature Sensor Evaporator Discharge Air Temperature Sensor C296 C296 Pin Circuit Measurement / Action Pin Circuit 2 RH111 (GY/BU) 1 VH406 (VT/BN) Is the resistance greater than 10, 000 ohms? Yes: GO to 6 . No: REPAIR the circuits.
6. CHECK THE EVAPORATOR TEMPERATURE SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND Measure: HVAC Module Ground C228A Ground Pin Circuit Measurement / Action Pin Circuit 19 VH406 (VT/BN) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 7 . No: REPAIR the circuit.
7. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «Heating Ventilation Air Conditioning (HVAC) Module»(ref-517581-S13895863382012121200000) . No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

DTC FAULT TRIGGER CONDITIONS

This pinpoint test checks the functions of the HVAC system and identifies the correct HVAC symptom pinpoint test.

REFER to Air Inlet Mode Door Actuator .

To rotate the air inlet mode door actuator, the HVAC module supplies voltage and ground to the air inlet mode door actuator through the door actuator motor circuits. To reverse the air inlet mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.

The air inlet mode door actuator feedback resistors are supplied a ground from the HVAC module by the air inlet mode door actuator return circuits and a 5-volt reference voltage on the air inlet mode door actuator reference circuits. The HVAC module reads the voltage on the air inlet mode door actuator feedback circuits to determine the air inlet mode door actuator position by the position of the actuator feedback resistor wiper arm.

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 FAULT TRIGGER CONDITIONS

To rotate the defrost/panel/floor mode door actuator, the HVAC module supplies voltage and ground to the defrost/panel/floor mode door actuator motor through the actuator motor circuits. To reverse the defrost/panel/floor mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.

The defrost/panel/floor mode door actuator feedback resistor is supplied a 5-volt reference voltage and ground from the HVAC module. The HVAC module measures the resistance on the defrost/panel/floor mode door actuator feedback circuit to determine the defrost/panel/floor mode door actuator position by the position of the actuator feedback resistor wiper arm.

During an actuator calibration cycle, the HVAC module drives the defrost/panel/floor mode door until the door reaches both internal stops in the HVAC case. If the defrost/panel/floor 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 FAULT TRIGGER CONDITIONS

Warm coolant flows from the engine through the heater core and back to the engine. Proper coolant temperatures are critical for good heater performance.

When the A/C is requested, the FCIM sends the message over the I-CAN to the IPC. The IPC then sends the button press message to BCM over the HS-CAN . The BCM then sends the button press message to the HVAC module over the MS-CAN . Lastly, the HVAC module sends an A/C request message through the MS-CAN to the BCM and the BCM sends the A/C request through the HS-CAN to the PCM.

REFER to Control System Logic

REFER to Controls and Compressor Cycling

When an A/C request is received by the PCM, the A/C compressor clutch only engages through the A/C clutch relay if all of these conditions are met

1. The PCM does not detect excessively high or low refrigerant pressure from the A/C pressure transducer.
2. The PCM does not detect excessively high engine coolant temperature.
3. The PCM does not detect an ambient air temperature below -1 C (30.2 F).
4. The PCM has not detected a WOT condition.
5. The HVAC module does not detect an evaporator discharge air temperature below 7.5 C (45.5 F).

When the A/C is requested, the FCIM sends the button press message over the I-CAN to the IPC. The IPC then sends the button press message to BCM over the HS-CAN . The BCM then sends the button press message to the HVAC module over the MS-CAN . Lastly the HVAC module sends an A/C request message through the MS-CAN to the BCM and the BCM sends the A/C request through the HS-CAN to the PCM.

REFER to Control System Logic

REFER to Controls and Compressor Cycling

When the A/C is requested, the FCIM sends the button press message over the I-CAN to the IPC. The IPC then sends the button press message to BCM over the HS-CAN . The BCM then sends the button press message to the HVAC module over the MS-CAN . Lastly the HVAC module sends an A/C request message through the MS-CAN to the BCM and the BCM sends the A/C request through the HS-CAN to the PCM.

REFER to Control System Logic

DTC FAULT TRIGGER CONDITIONS

To rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuator through the door actuator motor circuits. To reverse the temperature blend door actuator rotation, the HVAC module reverses the voltage and ground circuits.

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

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 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 the expected temperature.

DTC FAULT TRIGGER CONDITIONS

To rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuator through the door actuator motor circuits. To reverse the temperature blend door actuator rotation, the HVAC module reverses the voltage and ground circuits.

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

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 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 the expected temperature.

DTC FAULT TRIGGER CONDITIONS

When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered to the blower motor and the blower motor speed control from the relay. Ground for the motor is provided from the blower motor speed control. Ground is provided for the blower control module. The HVAC module sends a PWM signal to the blower motor speed control to control the blower speed.

DTC FAULT TRIGGER CONDITIONS

When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered to the blower motor and the blower motor speed control from the relay. Ground for the motor is provided from the blower motor speed control. Ground is provided for the blower control module. The HVAC module sends a PWM signal to the blower motor speed control to control the blower speed.

DTC FAULT TRIGGER CONDITIONS

REFER to Externally Controlled Variable Displacement Compressor (EVDC)

DTC FAULT TRIGGER CONDITIONS

Scheme 21

Scheme 22

1. CHECK FOR VOLTAGE TO THE A/C COMPRESSOR Ignition OFF. Disconnect: A/C Compressor. Ignition ON. Measure: A/C Compressor Ground C1110 Ground Pin Circuit Measurement / Action Pin Circuit 2 CBK03 (GY) - Ground Is the voltage greater than 11 volts? Yes: GO to 2 . No: VERIFY the BJB fuse 70 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate wiring diagrams to identify the possible causes of the circuit short. REFER to «OEM FUSE AND RELAY INFORMATION»(ref-485835) and «OEM WIRING DIAGRAMS»(ref-514995) .
2. CHECK THE A/C COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Disconnect: PCM C1381E. Measure: A/C Compressor Ground C1110 Ground Pin Circuit Measurement / Action Pin Circuit 1 VE462 (WH/BN) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 3 . No: REPAIR the circuit.
3. CHECK THE A/C COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO POWER Ignition ON. Measure: A/C Compressor Ground C1110 Ground Pin Circuit Measurement / Action Pin Circuit 1 VE462 (WH/BN) - Ground Is any voltage present? Yes: REPAIR the circuit. No: GO to 4 .
4. CHECK THE A/C COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR AN OPEN Ignition OFF. Measure: A/C Compressor PCM C1110 C1381E Pin Circuit Measurement / Action Pin Circuit 1 VE462 (WH/BN) 66 VE462 (WH/BN) Is the resistance less than 3 ohms? Yes: INSTALL a new A/C compressor, REFER to «Air Conditioning (AC) Compressor - 2.0L GTDI»(ref-517581-S35030191792012121200000) . CLEAR the DTC and REPEAT the self-test. If the DTC returns, GO to 5 . No: REPAIR the circuit.
5. CHECK FOR CORRECT PCM OPERATION Ignition OFF. Disconnect and inspect all PCM connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the PCM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to «POWERTRAIN CONTROL MODULE (PCM) - 2.0L GTDI»(ref-517566-S00665914912012121200000) . No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

REFER to In-Vehicle Temperature and Humidity Sensor .

DTC FAULT TRIGGER CONDITIONS

Scheme 23

Scheme 24

1. CHECK FOR HVAC MODULE DTCs Ignition ON. Using a scan tool, perform a HVAC module self-test. Are DTCs C1B14:11 or C1B14:12 present? Yes: REFER to «Diagnostic Routine C: C1B14:11, C1B14:12»(ref-517581-S37002518182012121200000) . No: GO to 2 .
2. CHECK FOR VOLTAGE TO THE IN-VEHICLE TEMPERATURE SENSOR/HUMIDITY SENSOR Ignition OFF. Disconnect: In-Vehicle Temperature/Humidity Sensor. Ignition ON. Measure: In-Vehicle Temperature/Humidity Sensor Ground C233 Ground Pin Circuit Measurement / Action Pin Circuit 2 LH111 (BN/WH) - Ground Is the voltage between 4.7 and 5 volts? Yes: For DTC B1A69:11, GO to 3 . For DTC B1A69:15, GO to 4 . No: REPAIR the circuit.
3. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO GROUND Ignition OFF. Disconnect: HVAC Module C228A Measure: In-Vehicle Temperature/Humidity Sensor Ground C233 Ground Pin Circuit Measurement / Action Pin Circuit 4 VH413 (WH/BU) - Ground Is the resistance greater than 10, 000 ohms? Yes: GO to 6 . No: REPAIR the circuit.
4. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR AN OPEN CIRCUIT Ignition OFF. Disconnect: HVAC Module C228B. Measure: In-Vehicle Temperature/Humidity Sensor HVAC Module C233 C228B Pin Circuit Measurement / Action Pin Circuit 4 VH413 (WH/BU) 18 VH413 (WH/BU) Is the resistance less than 3 ohms? Yes: GO to 5 . No: REPAIR the circuit.
5. CHECK THE HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO POWER Ignition ON. Measure: In-Vehicle Temperature/Humidity Sensor Ground C233 Ground Pin Circuit Measurement / Action Pin Circuit 4 VH413 (WH/BU) - Ground Is any voltage present? Yes: REPAIR the circuit. No: GO to 6 .
6. ISOLATE THE IN-VEHICLE TEMPERATURE SENSOR/HUMIDITY SENSOR Ignition OFF. Connect: HVAC Module C228A. Connect: HVAC Module C228B. Install a new in-vehicle temperature sensor/humidity sensor. REFER to «In-Vehicle Temperature Sensor»(ref-517581-S00510998232012121200000) . Ignition ON. Using a scan tool, perform a HVAC module self-test. Does the DTC return? Yes: GO to 7 . No: The cause of the concern was an inoperative in-vehicle temperature sensor/humidity sensor.
7. CHECK FOR CORRECT HVAC MODULE OPERATION Ignition OFF. Disconnect and inspect all HVAC module connectors. Repair: corrosion (install new connector or terminals - clean module pins) damaged or bent pins - install new terminals/pins pushed-out pins - install new pins as necessary Reconnect the HVAC module connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present. Is the concern still present? Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new HVAC module. REFER to «Heating Ventilation Air Conditioning (HVAC) Module»(ref-517581-S13895863382012121200000) . No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

The Air Conditioning Operation is Erratic

Refer to the OEM Wiring Diagrams - COOLING FAN for schematic and connector information.

Under normal operation when the A/C system is on, the engine cooling fan operates as commanded On or OFF by the PCM to cool down the A/C condenser core.

Refrigerant Identification

1. NOTE: A Refrigerant Blend Identifier 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 300-ROB16900E to obtain the sample for testing.
2. The refrigerant identifier 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 refrigerant identifier 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 identifier 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.
4. If contaminated refrigerant is detected, repeat the refrigerant identification test to verify that the refrigerant is indeed contaminated.