Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (A/I DAMP TARG PLS)

REPLACE AIR INLET CONTROL SERVO MOTOR

DTC B1442/42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

The damper servo (air inlet control) sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the air inlet control damper to the appropriate position, which controls the intake air settings (FRESH, FRESH / RECIRCULATION and RECIRCULATION).

HINT:
Confirm that there are no mechanical problems because this DTC can be output when either a damper link or damper is mechanically locked.

DTC No.
DTC Detection Condition
Trouble Area
B1442/42
Air inlet damper position does not change even if air conditioning amplifier operates air inlet damper control servo motor
  1. Air inlet control servo motor
  2. Air conditioning harness
  3. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1442/42 Air Inlet Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (A/I DAMP TARG PLS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the intelligent tester main switch ON.

  1. Select the items below in the Data List, and read the value displayed on the intelligent tester.

    Air conditioning amplifier:

    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    A/I Damp Targ Pls
    		Air inlet damper target pulse /
    for LHD Min.: 7, Max.: 19
    for RHD Min.: 7, Max.: 25
    for LHD
    1. RECIRCULATION: 19 (pulse)
    2. FRESH: 7 (pulse)
    for RHD
    1. RECIRCULATION: 7 (pulse)
    2. FRESH: 25 (pulse)
    		-
    OK:
    The display is as specified in the normal condition column.

    Result:

    Result
    		Proceed to
    NG
    		A
    OK (Checking from PROBLEM SYMPTOMS TABLE)
    		B
    OK (Checking from DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.REPLACE AIR INLET CONTROL SERVO MOTOR
HINT:
Since the servo motor cannot be tested when it is removed from the vehicle, replace the servo motor with a normal one and check that the condition returns to normal.
OK:
Same problem does not occur.


NG
REPAIR OR REPLACE AIR CONDITIONING HARNESS
OK

SYSTEM IS OK