2001 INFINITI QX4 02 sensor

Self-diagnosis=NBHA0021INTRODUCTION AND GENERAL DESCRIPTIONNBHA0021S01The 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 ªOFFº to ªONº) and pressing ª
º switch for at least
5 seconds. The ª
º switch must be pressed within 10 seconds after starting the engine (ignition switch is
turned ªONº). This system will be canceled by either pressing
(AUTO) switch or turning the ignition switch
ªOFFº. 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.
Without Navigation SystemNBHA0021S0101
RHA453GA
TROUBLE DIAGNOSES
Self-diagnosis
HA-44

5 STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Press(HOT) switch.
Does code No.
appear on the display?
RHA970DB
YesorNo
Ye s©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
YesorNo
Ye s©GO TO 7.
No©GO TO 14.
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-46

9 STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED
Press(HOT) switch.
Code No.
appears on the display.
RHA492A
©GO TO 10.
10 CHECK AMBIENT SENSOR
Press(DEF) switch one time, temperature detected by ambient sensor is indicated on the display.
ECON shown in display indicates negative temperature reading.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA499G
OK or NG
OK©GO TO 11.
NG©Go to Ambient Sensor Circuit (HA-129).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-49

11 CHECK IN-VEHICLE SENSOR
Press(DEF) switch the second time, temperature detected by in-vehicle sensor is indicated on the display screen.
ECON shown in display indicates negative temperature reading.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA500G
OK or NG
OK©GO TO 12.
NG©Go to In-vehicle Sensor Circuit (HA-132).
12 CHECK INTAKE SENSOR
Press(DEF) switch the third time, temperature detected by intake sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA500GB
OK or NG
OK©1. Press
(DEF) switch the fourth time. Display returns to original presentation 5.
2. Turn ignition switch OFF or
(AUTO) switch ON.
3. END
NG©Go to Intake Sensor Circuit (HA-139).
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-50

13 CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively two times.)
MTBL0083
*1: Conduct self-diagnosis STEP 2 under sunshine.
When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No.
will indicate despite that
sunload sensor is functioning properly.
*2: HA-129
*3: HA-132
*4: HA-139
*5: HA-135
*6: HA-141
RHA455G
RHA501A
©INSPECTION END
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-51

INTRODUCTION AND GENERAL DESCRIPTIONNBHA0021S04The 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 ªOFFº to ªONº) and pressing ª
º switch for at least
5 seconds. The ª
º switch must be pressed within 10 seconds after starting the engine (ignition switch is
turned ªONº). This system will be canceled by either pressing
(AUTO) switch or turning the ignition switch
ªOFFº. 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.
With Navigation SystemNBHA0021S0401
RHA859H
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-54

5 STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Turn temperature dial clockwise.
Does code No.
appear on the display?
RHA970DB
YesorNo
Ye s©GO TO 6.
No©GO TO 14.
6 STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn temperature dial clockwise.
Does code No.
appear on the display?
RHA869DD
YesorNo
Ye s©GO TO 7.
No©GO TO 15.
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-56

9 STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED
Turn temperature dial clcokwise.
Code No.
appears on the display.
RHA492A
©GO TO 10.
10 CHECK AMBIENT SENSOR
Press(DEF) switch one time, temperature detected by ambient sensor is indicated on the display.
ECON shown in display indicates negative temperature reading.
NOTE:
If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.
RHA861H
OK or NG
OK©GO TO 11.
NG©Go to Ambient Sensor Circuit (HA-129).
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-59