Infiniti F50. Manual — part 132

TROUBLE DIAGNOSIS

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Self-diagnosis Function

EJS000JK

DESCRIPTION

The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch to ON) and pressing OFF switch for at least 5 seconds. The
“OFF” switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This
system will be canceled by either pressing AUTO switch or turning the ignition switch OFF. Shifting from one
step to another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pushing (fan)
UP switch.

RJIA1588E

ATC-54

TROUBLE DIAGNOSIS

FUNCTION CONFIRMATION PROCEDURE

1.

SET IN SELF-DIAGNOSTIC MODE

1.

Turn ignition switch ON.

2.

Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.

CAUTION:

If battery voltage drops below 12V during diagnosis step-3, actuator speed becomes slower and
as a result, the system may generate an error even when operation is normal. To avoid this, start
engine before performing this diagnosis.

>> GO TO 2.

2.

STEP-1: LEDS AND DISPLAY ARE CHECKED

Check LED illumination and display screen.

OK or NG

OK

>> GO TO 3.

NG

>> Malfunctioning OFF switch, LED or auto amp. Refer to

ATC-118, "Multiplex Communication Cir-

cuit"

.

3.

CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2

1.

Turn the temperature dial clockwise.

2.

Advance to self-diagnosis STEP-2?

YES or NO

YES

>> GO TO 4.

NO

>> Malfunctioning temperature dial.
>> Replace multifunction switch.

RJIA1565E

SJIA0274E

TROUBLE DIAGNOSIS

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4.

CHECK TO RETURN SELF-DIAGNOSIS STEP-1

1.

Turn the temperature dial counterclockwise.

2.

Return to self-diagnosis STEP-1?

YES or NO

YES

>> GO TO 5.

NO

>> Malfunctioning temperature dial.
>> Replace multifunction switch.

5.

STEP- 2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

1.

Turn the temperature dial clockwise.

2.

Does code No.20 appear on the display?

YES or NO

YES

>> GO TO 6.

NO

>> GO TO 14.

6.

STEP- 3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

1.

Turn the temperature dial clockwise.

2.

Does code No.30 appear on the display?

YES or NO

YES

>> GO TO 7.

NO

>> GO TO 15.

7.

STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED

1.

Turn the temperature dial clockwise.

2.

Press DEF switch, code No. of each actuator test is indicated on
the display.

>> GO TO 8.

RJIA0219E

RJIA0220E

RJIA0221E

ATC-56

TROUBLE DIAGNOSIS

8.

CHECK ACTUATORS

Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and com-
pressor operation.

Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.

OK or NG

OK

>> GO TO 9.

NG

>>

●

Air outlet does not change.
Go to Mode Door Motor

ATC-73, "DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR"

.

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Intake door does not change.
Go to Intake Door Motor

ATC-79, "DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR"

.

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Blower motor operation is malfunctioning.
Go to Blower Motor

ATC-83, "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR"

.

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Magnet clutch does not engage.
Go to Magnet Clutch

ATC-87, "DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH"

.

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Discharge air temperature does not change.

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Mode door position
(Driver side)

VENT

(B/L

OPEN)

VENT

(B/L SHUT)

B/L 1

(B/L SHUT)

B/L 1

(B/L

OPEN)

B/L 2

FOOT

D/F

DEF

Mode door position
(Passenger side)

VENT

(B/L

OPEN)

VENT

(B/L SHUT)

B/L 1

(B/L SHUT)

B/L1

(B/L

OPEN)

B/L 2

FOOT 1

FOOT 2

DEF

Intake door position

REC

REC

REC

20% FRE

20% FRE

FRE

FRE

FRE

Air mix door position

FULL

COLD

FULL

COLD

FULL

COLD

FULL HOT

FULL HOT

FULL

HOT

FULL

HOT

FULL

HOT

Blower fan duty ratio

37%

37%

91%

65%

65%

65%

65%

91%

Compressor

ON

ON

ON

OFF

OFF

OFF

ON

ON

Rear vent door posi-
tion

OPEN

SHUT

SHUT

SHUT

SHUT

SHUT

SHUT

SHUT

Electronic control
valve (ECV) duty
ratio

100%

50%

100%

0%

0%

0%

50%

100%

RJIA0222E