2001 INFINITI QX4 Factory Service Manual

Page 1169 of 2395

INFINITI QX4 2001  Factory Service Manual SEF028Z
Component DescriptionNBEC0398The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detect

Page 1170 of 2395

INFINITI QX4 2001  Factory Service Manual Wiring DiagramNBEC0401
MEC977C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
POWER STEERING OIL PRESSURE SWITCH
Wiring Diagram
EC-635

Page 1171 of 2395

INFINITI QX4 2001  Factory Service Manual Diagnostic ProcedureNBEC0402
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Check ªPW/ST SIGNALº in ªDAT

Page 1172 of 2395

INFINITI QX4 2001  Factory Service Manual 4 CHECK POWER STEERING OIL PRESSURE SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Disconnect power steering oil pressure switch harness connector.
SEF028Z
3. Check harne

Page 1173 of 2395

INFINITI QX4 2001  Factory Service Manual 7 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-140.
©INSPECTION END
POWER STEERING OIL PRESSURE SWITCH
Diagnostic Procedure (Contd)
EC-638

Page 1174 of 2395

INFINITI QX4 2001  Factory Service Manual SEF029Z
DescriptionNBEC0636The refrigerant pressure sensor is installed at the liquid tank of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrige

Page 1175 of 2395

INFINITI QX4 2001  Factory Service Manual Wiring DiagramNBEC0637
MEC982C
REFRIGERANT PRESSURE SENSOR
Wiring Diagram
EC-640

Page 1176 of 2395

INFINITI QX4 2001  Factory Service Manual Diagnostic ProcedureNBEC0638
1 CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch ªONº.
3. Check