B1442

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1442/42: Air Inlet Damper Control Servo Motor Circuit

DTC B1442/42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The recirculation damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the recirculation damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION and RECIRCULATION).

HINT: Confirm that no mechanical problem is present because this diagnostic trouble code can be output when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR INLET DAMPER TARGET PULSE)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List / Air Inlet Damper Targ Pulse.
(e) According to the display on the Techstream, read the Data List.

Air Conditioner





OK:
The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. REPLACE RECIRCULATION DAMPER SERVO
(a) Temporarily replace the recirculation damper servo with a new one Disassembly.

HINT: Since the damper servo cannot be inspected while it is removed from the vehicle, replace the damper servo with a new one and check that the condition returns to normal.

NEXT -- Continue to next step.

3. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTC Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS
OK -- END (RECIRCULATION DAMPER SERVO IS DEFECTIVE)
4. REPAIR OR REPLACE AIR CONDITIONING HARNESS
(a) Repair or replace the air conditioning harness Disassembly.
NEXT -- Continue to next step.

5. CHECK FOR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTC again Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END