2001 INFINITI QX4 Factory Service Manual

Page 1937 of 2395

INFINITI QX4 2001  Factory Service Manual 4 CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between sunload sensor harness terminal No. 1 and

Page 1938 of 2395

INFINITI QX4 2001  Factory Service Manual SHA930E
RHA584E
Intake Sensor Circuit
COMPONENT DESCRIPTIONNBHA0105Intake SensorNBHA0105S01The intake sensor is located on the cooling unit. It converts tem-
perature of air after it passes through th

Page 1939 of 2395

INFINITI QX4 2001  Factory Service Manual RHA056GI
DIAGNOSTIC PROCEDURENBHA0106SYMPTOM: Intake sensor circuit is open or shorted. (or
þ
is indicated on the display as a result of conducting
Self-diagnosis STEP 2.)
1 CHECK INTAKE SENSOR CIRCU

Page 1940 of 2395

INFINITI QX4 2001  Factory Service Manual 3 CHECK INTAKE SENSOR
Refer to HA-139.
OK or NG
OK©1. Replace auto amp.
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed

Page 1941 of 2395

INFINITI QX4 2001  Factory Service Manual RHA888H
Multiplex Communication Circuit
DIAGNOSTIC PROCEDURENBHA0118SYMPTOM:
IA/C system does not come on.
IA/C system can not controlled.
1 CHECK CIRCUIT CONTINUITY BETWEEN DISPLAY & NAVI CONTROL UNI

Page 1942 of 2395

INFINITI QX4 2001  Factory Service Manual 3 CHECK MULTIPLEX COMMUNICATION SIGNAL
Do approx. 3.5 volts exist between auto amp. harness terminal No. 40 and body ground?
RHA891H
YesorNo
Ye s©INSPECTION END.
No©1. Replace Display & NAVI control

Page 1943 of 2395

INFINITI QX4 2001  Factory Service Manual HFC-134a (R-134a) Service ProcedureNBHA0070SETTING OF SERVICE TOOLS AND EQUIPMENTNBHA0070S01DISCHARGING REFRIGERANTNBHA0070S0101WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Ex

Page 1944 of 2395

INFINITI QX4 2001  Factory Service Manual SHA251FA
*1: HA-146
*2: HA-155*3: HA-157
*4: HA-114*5: HA-2
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
SERVICE PROCEDURE
HFC-134a (R-134a) Service Procedure (Contd)
HA-145