Infiniti F50. Manual - part 138

TROUBLE DIAGNOSIS

ATC-77

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Intake Door Motor Circuit

EJS000JQ

SYMPTOM:

●

Intake door does not change.

●

Intake door motor does not operate normally.

INSPECTION FLOW

*1

ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No.1.

*2

ATC-108, "Ambient Sensor Circuit"

.

*3

ATC-110, "In-Vehicle Sensor Cir-
cuit"

.

*4

ATC-113, "Sunload Sensor Circuit"

.

*5

ATC-74, "Air Mix Door Motor Circuit"

. *6

ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 14.

*7

ATC-67, "LAN System Circuit"

.

*8

ATC-79, "COMPONENT DESCRIP-
TION"

 for intake door motor.

*9

ATC-62, "Operational Check"

.

*10

ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No.5 to 7.

*11

ATC-35, "SYMPTOM TABLE"

.

*12

ATC-116, "Intake Sensor Circuit"

.

RJIA1569E

ATC-78

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Intake door control system components are:

●

Auto amp.

●

Intake door motor

●

A/C LAN system (PBR built-in mode motor and air mix door motor)

●

In-vehicle sensor

●

Ambient sensor

●

Sunload sensor

●

Intake sensor

System Operation

The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the ECON, DEFROST, or OFF switches are pushed, the auto
amplifier sets the intake door at the FRESH position.

Intake Door Control Specification

RJIA1291E

RHA383H

TROUBLE DIAGNOSIS

ATC-79

C

D

E

F

G

H

I

K

L

M

A

B

ATC

COMPONENT DESCRIPTION
Intake Door Motor

The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the auto amplifier. Motor rotation is
conveyed to a lever which activates the intake door.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTOM: Intake door motor does not operate normally.
Perform diagnostic procedure for LAN system circuit. Refer to 

ATC-67, "DIAGNOSTIC PROCEDURE FOR

LAN CIRCUIT"

 .

Rear Ventilator Door Motor

EJS001Y9

COMPONENT DESCRIPTION

Rear ventilator door motor is attached to the rear ventilator duct No.
1.
Rear ventilator door is opened or closed by rear ventilator door
motor.

DIAGNOSTIC PROCEDURE FOR REAR VENTILATOR DOOR MOTOR

SYMPTOM: Rear ventilator door motor does not operate.

RJIA0280E

RJIA0289E

RJIA0290E

ATC-80

TROUBLE DIAGNOSIS

1. 

CHECK FOR AUTO AMP. OUTPUT

1.

Disconnect rear vent door motor connector.

2.

Set up code No. 41 and 42 in self-diagnosis STEP-4.

3.

Check voltage between rear vent door motor harness connector
M93 terminals 1 (LG), 2 (W/B) and ground.

OK or NG

OK

>> Replace rear ventilator door motor.

NG

>> GO TO 2.

2. 

CHECK CIRCUIT CONTINUITY BETWEEN REAR VENTILATOR DOOR MOTOR AND AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between rear vent door motor harness connec-
tor M93 terminals 1 (LG), 2 (W/B) and auto amp. harness con-
nector M119 terminals 6 (LG), 16 (W/B).

OK or NG

OK

>> Replace auto amp.

NG

>> GO TO 

ATC-80, "DIAGNOSTIC PROCEDURE FOR

REAR CONTROL SWITCH"

 .

Rear control switch

EJS0023Q

DIAGNOSTIC PROCEDURE FOR REAR CONTROL SWITCH 

SYMPTOM: Rear control switch does not operate. 

1. 

CHECK MULTIPLEX COMMUNICATION ERROR

1.

Set in self-diagnosis STEP-5. Refer to 

ATC-54, "FUNCTION CONFIRMATION PROCEDURE"

 .

2.

Press intake switch.

3.

Check multiplex communication error between rear control switch and auto amp.

OK or NG

OK

>> GO TO 

AV-33, "Rear Control Switch Operation Does Not Work"

 .

NG

>> GO TO 

ATC-121, "DIAGNOSTIC PROCEDURE FOR MULTIPLEX COMMUNICATION CIRCUIT

(REAR CONTROL SWITCH)"

 .

Terminals

Voltage

(+)

(-)

Code No.

Rear vent door 

motor connec-

tor

Terminal No. 

(Wire color)

Ground

41

M93

1 (LG)

Approx. 12V

M93

2 (W/B)

Approx. 0V

42

M93

1 (LG)

Approx. 0V

M93

2 (W/B)

Approx.12V

RJIA0291E

1 – 6

: Continuity should exist.

2 – 16

: Continuity should exist.

RJIA0292E