Infiniti QX4 (R50). Manual — part 462
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.
TROUBLE DIAGNOSES
Self-diagnosis (Cont’d)
HA-46
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.
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-47
8
CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor opera-
tion.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
MTBL0200
MTBL0044
OK or NG
OK
©
GO TO 9.
NG
©
I
Air outlet does not change.
Go to “Mode Door Motor” (HA-75).
I
Intake door does not change.
Go to “Intake Door Motor” (HA-87).
I
Blower motor operation is malfunctioning.
Go to “Blower Motor” (HA-95).
I
Magnet clutch does not engage.
Go to “Magnet Clutch” (HA-104).
I
Discharge air temperature does not change.
Go to “Air Mix Door Motor” (HA-82).
TROUBLE DIAGNOSES
Self-diagnosis (Cont’d)
HA-48
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
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