Component Location

General Description

DTC Description

DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	• Voltage check	• Poor connection of connected part • Open circuit in harness • Short circuit in harness • Faulty passenger air mix actuator
Threshold value	• < 0.1V
Detecting time	• 0.3sec
FAIL SAFE	• setting temperature : 17°C-24.5°C fix at max. cooling position • setting temperature : 25°C-32°C fix at max. heating position

Signal Waveform And Data

Door position	Voltage	Error Detecting Condition
Max. cool	0.3±0.15V	Undervoltage : 0.08V or less
Max.warm	4.7±0.15V	Overvoltage : 4.9V or more

Schematic Diagram

Monitor DTC Status

1.	Connect scantool to Data Link Connector(DLC).

2.	Warm up the engine to normal operating temperature.

3.	Monitor DTC(Diagnostics Trouble Code) on the scantool.

4.

Is the same DTC displayed again? ▶ Go to " Inspection/Repair " procedure . ▶ Fault is intermittent caused by poor contact in the sensor's and/or A/C-ECM connector or was repaired and A/C-ECM memory was not cleared. Thoroughly check connectors for looseness, poorconnection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.

W/harness Inspection

1.	Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.

3.	Has a problem been found? ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure ▶ Go to "Signal circuit Open Inspection" procedure.

Signal Circuit Open Inspection

1.	Ignition "OFF"

2.	A/C-ECU, passenger air mix actuator : Disconnect.

3.	Measure resistance between Signal(F/B) terminal of passenger air mix actuator harness connector and Signal(F/B) terminal of A/C-ECU harness connector. Specification : 1Ω below

4.	Is "resistance" display near the specified value? ▶ Go to "Sensor ground circuit Open Inspection " procedure. ▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

1.	Ignition "OFF"

2.	A/C-ECU : Connect, passenger air mix actuator : Disconnect.

3.	Measure resistance between Signal(F/B) terminal of passenger air mix actuator harness connector and and chassis ground . Specification : Infinity

4.	Is "resistance" display near the specified value? ▶ Go to "Power circuit Open Inspection " procedure. ▶ Check for short to ground in control harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Power Circuit Ground Short Inspection

1.	Ignition "OFF"

2.	A/C-ECU, passenger air mix actuator : Disconnect.

3.	Measure resistance between Sensor REF(5V) terminal of passenger air mix actuator harness connector and Sensor REF(5V) terminal of A/C-ECU harness connector. Specification : 1Ω below

4.	Is "resistance" display near the specified value? ▶ Go to "Power circuit Inspection" procedure. ▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

1.	Ignition "OFF"

2.	A/C-ECU : Connect, passenger air mix actuator : Disconnect.

3.	Ignition "ON"(ENGINE "OFF").

4.	Measure voltage between Sensor REF(5V) terminal of passenger air mix actuator harness connector and and chassis ground . Specification : approx. 5V

5.	Is "voltage" display near the specified value? ▶ Go to "Sensor ground circuit Open Inspection " procedure. ▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

1.	Ignition "OFF"

2.	A/C-ECU, passenger air mix actuator : Disconnect.

3.	Measure resistance between Sensor ground(-) terminal of passenger air mix actuator harness connector and Sensor ground(-) terminal of A/C-ECU harness connector. Specification : 1Ω below

4.	Is "resistance" display near the specified value? ▶ Go to " Component inspection " procedure . ▶ Check for open in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Component Inspection

Check passenger air mix actuator

1.	Ignition "OFF".

2.	A/C-ECU, passenger air mix actuator : Disconnect.

3.	Connect (+) terminal of battery to WARM(+) of passenger air mix actuator and (-) terminal to COOL(-) .(Component side)

4.	Verify that the temperature actuator operates to the cool position

5.

Verify that the temperature actuator operates to the warm position with reverse connecting.( WARM(+) and COOL(-) ) .(Component side) Specification : Refer the specifications in fig.1 Actuator harness WARM(+) COOL(-) Door position Battery terminal 12 V ground Max.warm ground 12 V Max.cool ※ Function of the actuator motor according to terminal connection type. (observe safety regulations)

6.

Is "Door position" display near the specified value? ▶ Go to "Check potentiometer" procedure. ▶ Substitute with a known-good passenger air mix actuator and check for proper operation. If the problem is corrected, replace passenger air mix actuator and then go to "Verification of Vehicle Repair" procedure.

1.	Ignition "OFF"

2.	A/C-ECU : Connect, passenger air mix actuator : Disconnect.

3.	Ignition "ON"(ENGINE "OFF").

4.

Measure voltage between Signal(F/B) terminal of passenger air mix actuator harness connector and and Sensor ground(-) terminal of A/C-ECU harness connector .(Component side) Specification : Refer the specifications in fig.2 Door position Voltage Error Detecting Condition Max. cool 0.3±0.15V Undervoltage : 0.08V or less Max.warm 4.7±0.15V Overvoltage : 4.9V or more ※ Voltage value of Air Mix potentiometer as a function of temp door position.

5.

Is "voltage" display near the specified value? ▶ Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure. ▶ Substitute with a known-good passenger air mix actuator and check for proper operation. If the problem is corrected, replace passenger air mix actuator and then go to "Verification of Vehicle Repair" procedure.

Verification Of Vehicle Repair

1.	Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

2.	Using scantool, Clear DTC.

3.	Operate the vehicle within DTC Enable conditions in General information.

4.	Are any DTCs present? ▶ Go to the applicable troubleshooting procedure. ▶ System is performing to specification at this time.