Dtc 42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTUATOR CHECK

CHECK HARNESS AND CONNECTOR (DAMPER SERVO - AIR CONDITIONING AMPLIFIER)

CHECK DAMPER SERVO SUB-ASSEMBLY (AIR INLET DAMPER SERVO MOTOR)

DTC 42 Air Inlet Damper Control Servo Motor Circuit


DESCRIPTION

Recirculation of fresh air is controlled as follows:
The damper servo (air inlet damper servo motor) sends the air inlet damper position as a pulse signal to the air conditioning amplifier. Then the air conditioning amplifier uses the pulse signal to determine how much the servo motor should be rotated forward/backward, and moves the air inlet damper to the appropriate position.
HINT:
This DTC is also output if the damper and damper link are malfunctioning or unable to move properly. When this DTC is output, confirm that the mechanical parts of the damper and damper link are not defective or damaged.

DTC Code
Detection Item
Trouble Area
42
Air inlet damper control servo motor activation request signal is output, but servo motor position data does not change or is inaccurate
  1. Damper servo sub-assembly (Air inlet damper servo motor)
  2. Harness or connector
  3. Air conditioning amplifier assembly

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 42 Air Inlet Damper Control Servo Motor Circuit


INSPECTION PROCEDURE

1.PERFORM ACTUATOR CHECK

  1. Remove the glove box to visually check the damper servo (air inlet damper servo motor) operation.

  1. Enter actuator check mode (Toyota Fortuner RM000003PQ3001X.html).

  1. Press the DEF switch to change to the step operation (Toyota Fortuner RM000003PQ1001X.html).

  1. Press the DEF switch to check the operation of the damper servo (air inlet damper servo motor).

    Display Code
    		Air Inlet Control Damper Position
    0
    		FRESH
    1
    		FRESH
    2
    		RECIRCULATION/FRESH
    (50%)
    3
    		RECIRCULATION
    4
    		RECIRCULATION
    5
    		FRESH
    6
    		FRESH
    7
    		RECIRCULATION
    8
    		FRESH
    9
    		FRESH
    OK:
    Air inlet control damper position changes in accordance with each display code.
    Result
    Result
    		Proceed to
    OK (Checking from the PROBLEM SYMPTOMS TABLE)
    		A
    OK (Checking from the DTC)
    		B
    NG
    		C


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)

C
Go to step 2
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM000003S6F002X.html)

2.CHECK HARNESS AND CONNECTOR (DAMPER SERVO - AIR CONDITIONING AMPLIFIER)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 42 Air Inlet Damper Control Servo Motor Circuit

  1. Disconnect the D1 servo connector.

  1. Disconnect the A15 and A16 amplifier connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D1-4 - A16-22 (AIR)
    		Always
    		Below 1 Ω
    D1-5 - A16-23 (AIF)
    D1-2 - A15-17 (PIA)
    D1-3 - A15-16 (PIB)
    D1-1 - A15-21 (SG-7)
    D1-4 - Body ground
    		Always
    		10 kΩ or higher
    D1-5 - Body ground
    D1-2 - Body ground
    D1-3 - Body ground
    D1-1 - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK DAMPER SERVO SUB-ASSEMBLY (AIR INLET DAMPER SERVO MOTOR)

  1. Check if the malfunction disappears when a normally functioning damper servo (air inlet damper servo motor) is installed.

    OK:
    Air inlet control damper operates normally.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)
OK

REPLACE DAMPER SERVO SUB-ASSEMBLY (AIR INLET DAMPER SERVO MOTOR) (Toyota Fortuner RM0000012JL002X.html)