DTC 19


BHE070201038W15

DTC 19

Air mix actuator (potentiometer) system inspection

POSSIBLE CAUSE

• Air mix actuator malfunction
• Open circuit in wiring harness between A/C amplifier and air mix actuator
• Short circuit in wiring harness between A/C amplifier (terminal 2H) and air mix actuator (terminal E)

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• Inspect the air mix actuator. (See AIR MIX ACTUATOR INSPECTION.)
• Is it normal?
Yes
Go to the next step.
No
Replace the air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
2
• Disconnect the A/C amplifier connector (16-pin) and the air mix actuator connector.
• Is there an open circuit in the wiring harness between the following terminals of the A/C amplifier connector (16-pin) and the air mix actuator connector?
– 2O-A
– 2H-E
– 2P-C
Yes
Repair the wiring harness.
No
Go to the next step.
3
• Is there a short circuit to ground in the wiring harness between A/C amplifier connector (16-pin) terminal 2H and air mix actuator connector terminal E?
Yes
Repair the wiring harness.
No
The system is normal at present. (Clear the past malfunction from memory.)