DTC 21

id070200803300

DTC 21

Airflow mode actuator (potentiometer) system inspection

POSSIBLE CAUSE

•  Airflow mode actuator malfunction

•  Short to ground in wiring harness between A/C amplifier connector terminals 2G and 2N

•  Open circuit in wiring harness between A/C amplifier connector terminals 2P and 2N

•  Connector or terminal malfunction

•  Open circuit in wiring harness between A/C amplifier connector terminals 2P and 2G

DTC 21	Airflow mode actuator (potentiometer) system inspection
POSSIBLE CAUSE	• Airflow mode actuator malfunction • Short to ground in wiring harness between A/C amplifier connector terminals 2G and 2N • Open circuit in wiring harness between A/C amplifier connector terminals 2P and 2N • Connector or terminal malfunction • Open circuit in wiring harness between A/C amplifier connector terminals 2P and 2G

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT AIRFLOW MODE ACTUATOR

•  Inspect the airflow mode actuator.
(See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

•  Is it normal?

Yes

Go to the next step.

No

Replace the airflow mode actuator.

(See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

2

INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR SHORT TO GROUND

•  Disconnect the air mix actuator connector.

•  Is the resistance between terminals 2G and 2N of the A/C amplifier connector (16-pin) 698 ohms or more?

Yes

Go to the next step.

No

Repair the wiring harness. (Short circuit)

3

INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT

•  Disconnect the A/C amplifier connector (16-pin).

•  Is the resistance between terminals 2P and 2N of the A/C amplifier connector (16-pin) 6.0 kilohms or less?

Yes

Go to the next step.

No

Repair the wiring harness. (Open circuit)

4

INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT

•  Is the resistance between terminals 2P and 2G of the A/C amplifier connector (16-pin) 5.2 kilohms or less?

Yes

Inspect the connection at the A/C amplifier connector (16-pin).

No

Repair the wiring harness. (Open circuit)

STEP	INSPECTION		ACTION
1	INSPECT AIRFLOW MODE ACTUATOR • Inspect the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is it normal?	Yes	Go to the next step.
1		No	Replace the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
2	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR SHORT TO GROUND • Disconnect the air mix actuator connector. • Is the resistance between terminals 2G and 2N of the A/C amplifier connector (16-pin) 698 ohms or more?	Yes	Go to the next step.
2		No	Repair the wiring harness. (Short circuit)
3	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT • Disconnect the A/C amplifier connector (16-pin). • Is the resistance between terminals 2P and 2N of the A/C amplifier connector (16-pin) 6.0 kilohms or less?	Yes	Go to the next step.
3		No	Repair the wiring harness. (Open circuit)
4	INSPECT AIRFLOW MODE ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT • Is the resistance between terminals 2P and 2G of the A/C amplifier connector (16-pin) 5.2 kilohms or less?	Yes	Inspect the connection at the A/C amplifier connector (16-pin).
4		No	Repair the wiring harness. (Open circuit)