Component Location

General Description

DTC Description

DTC Detecting Condition

Item	Detecting Condition	Error Detecting Condition
DTC Strategy	• Voltage check	• Poor connection of connected part • Open circuit in harness • Short circuit in harness • Faulty intake motor • Fault A/C Control Unit
Threshold value	• 0.5V<Potentiometer voltage < 4.5V
Detecting time	• 40 sec
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	Note
FRE	0.3±0.15V	Undervoltage : 0.08V or less
REC	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 "Motor control circuit Open Inspection" procedure.

1.	Ignition "OFF"

2.	A/C-ECU, Intake actuator : Disconnect.

3.	Measure resistance between Motor(+) terminal of Intake actuator harness connector and Motor(+) terminal of A/C-ECU harness connector.

4.	Measure resistance between Motor(-) terminal of Intake actuator harness connector and Motor(-) terminal of A/C-ECU harness connector. Specification : 1Ω below

5.	Is "resistance" display near the specified value? ▶ Go to "Motor control circuit short to ground 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, Driver air mix actuator : Disconnect.

3.	Measure resistance between Motor(+) terminal of Driver air mix actuator harness connector and and chassis ground .

4.	Measure resistance between Motor(-) terminal of Driver air mix actuator harness connector and and chassis ground . Specification : Infinity

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

Component Inspection

Check Intake actuator

1.	Ignition "OFF"

2.	A/C-ECU, Intake actuator : Disconnect.

3.	Connect (+) terminal of battery to FRE(+) of intake actuator and (-) terminal to REC(-) .(Component side)

4.	Verify that the actuator operates to the REC position

5.

Verify that the temperature actuator operates to the FRE position with reverse connecting.( REC(-) and FRE(+)) (Component side) Specification : Refer the specifications in fig.1 Actuator harness FRE(+) REC(-) Door position Battery terminal 12 V ground REC(-) ground 12 V REC ※ 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 Intake actuator and check for proper operation. If the problem is corrected, replace Intake actuator and then go to "Verification of Vehicle Repair" procedure.

1.	Ignition "OFF"

2.	A/C-ECU : Connect, Intake actuator : Disconnect.

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

4.

Measure voltage between Signal(F/B) terminal of Intake actuator harness connector and and chassis ground .(Component side) Specification : Refer the specifications in fig.2 Door position Voltage Note FRE 0.3±0.15V Undervoltage : 0.08V or less REC 4.7±0.15V Overvoltage : 4.9V or more Specifications : Voltage value of intake potentiometer as a function of intake 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 Driver air mix actuator and check for proper operation. If the problem is corrected, replace Driver 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.