2001 INFINITI QX4 Factory Service Manual

Page 1857 of 2395

INFINITI QX4 2001  Factory Service Manual 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

Page 1858 of 2395

INFINITI QX4 2001  Factory Service Manual 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 d

Page 1859 of 2395

INFINITI QX4 2001  Factory Service Manual 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

Page 1860 of 2395

INFINITI QX4 2001  Factory Service Manual 13 DETECTS MULTIPLEX COMMUNICATION ERROR
Press REC switch.
Does code No.
appears on the display
MTBL0509
YesorNo
Ye s©INSPECTION END
No©1. Go to ªMultiplex Communication Circuitº, HA-142.
2. Go to

Page 1861 of 2395

INFINITI QX4 2001  Factory Service Manual 14 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

Page 1862 of 2395

INFINITI QX4 2001  Factory Service Manual 15 CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode or (and) intake door motor position switch(es) is (are) malfunctioning.
(If two or more mode or intake doors are out of order, corresponding cod

Page 1863 of 2395

INFINITI QX4 2001  Factory Service Manual AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER=NBHA0021S06With Navigation SystemNBHA0021S0601The trimmer compensates for differences in range of±3ÉC (±6ÉF) between temperature setting (displayed

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INFINITI QX4 2001  Factory Service Manual How to Perform Trouble Diagnoses for Quick
and Accurate Repair
=NBHA0018WORK FLOWNBHA0018S01
SHA900E
*1: Operational Check (HA-66)
SYMPTOM TABLENBHA0018S02
Symptom Reference Page
IA/C system does not