Infiniti G20 (P11). Manual — part 425

Self-diagnosis

=NCHA0021

INTRODUCTION AND GENERAL DESCRIPTION

NCHA0021S01

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 from “OFF” to “ON”) and pressing “

” switch for at least

5 seconds. The “

” 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 pushing

(HOT) or

(COLD) switch,

as required.
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing

(fan)

UP switch.

RHA453GA

GI

MA

EM

LC

EC

FE

CL

MT

AT

AX

SU

BR

ST

RS

BT

SC

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IDX

TROUBLE DIAGNOSES

AUTO

Self-diagnosis

HA-31

STEP-BY-STEP PROCEDURE

=NCHA0021S02

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

switch for at least 5 seconds.

©

GO TO 2.

2

STEP 1 - LEDs AND SEGMENT ARE CHECKED

Do all LEDs and segments illuminate?

RHA454GA

Yes or No

Yes

©

GO TO 3.

No

©

Malfunctioning

switch, LED or fluorescent display tube.

Replace A/C auto amp.

3

CHECK TO ADVANCE SELF-DIAGNOSIS STEP 2

1. Press

(HOT) switch.

2. Advance to self-diagnosis STEP 2?

Yes or No

Yes

©

GO TO 4.

No

©

Malfunctioning

(HOT) switch.

Replace A/C auto amp.

4

CHECK TO RETURN SELF-DIAGNOSIS STEP 1

1. Press

(COLD) switch.

2. Return to self-diagnosis STEP 1?

Yes or No

Yes

©

GO TO 5.

No

©

Malfunctioning

(COLD) switch.

Replace A/C auto amp.

TROUBLE DIAGNOSES

AUTO

Self-diagnosis (Cont’d)

HA-32

5

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

Press

(HOT) switch.

Does code No.

appear on the display?

RHA970DB

Yes or No

Yes

©

GO TO 6.

No

©

GO TO 13.

6

STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Press

(HOT) switch.

Does code No.

appear on the display?

RHA869DD

Yes or No

Yes

©

GO TO 7.

No

©

GO TO 14.

GI

MA

EM

LC

EC

FE

CL

MT

AT

AX

SU

BR

ST

RS

BT

SC

EL

IDX

TROUBLE DIAGNOSES

AUTO

Self-diagnosis (Cont’d)

HA-33

7

STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED

Press

(HOT) switch.

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

RHA495A

©

GO TO 8.

TROUBLE DIAGNOSES

AUTO

Self-diagnosis (Cont’d)

HA-34