Infiniti Q45 (FY33). Manual — part 250
SEF757X
SEF451U
SEF166T
SEF663P
SEF452U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Start engine.
2. Check “PW/ST SIGNAL” in
“DATA MONITOR” mode with
CONSULT-II.
Steering is neutral position: OFF
Steering is turned: ON
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Start engine.
2. Check voltage between ECM
terminal
100
and ground under
the following conditions.
Voltage:
When steering wheel is
turned quickly.
Approximately 0V
Except above
Battery voltage
NG
E
OK
INSPECTION END
CHECK POWER SUPPLY-I.
1. Stop engine.
2. Disconnect IACV-FICD solenoid valve
harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
1
and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
10A fuse
I
Harness for open or
short between IACV-
FICD solenoid valve and
fuse
CHECK POWER SUPPLY-II.
1. Turn ignition switch “OFF”.
2. Disconnect power steering oil pressure
switch harness connector.
3. Check voltage terminal
q
1
(or ECM
terminal
100
and ground.
Voltage: Battery voltage
OK
E
NG
Repair harness or connec-
tors.
q
A
(Go to next page.)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Power Steering Oil Pressure Switch (Cont’d)
H
H
H
H
EC-529
SEF163T
SEF453U
q
A
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect power steering oil pressure
switch harness connector.
3. Check harness continuity between ter-
minal
q
2
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
E101
,
E21
I
Harness for open or short
between power steering
pressure switch and
ground
If NG, repair open circuit or
short to power in harness
or connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
100
and terminal
q
1
.
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENTS
(Power steering oil pressure switch and
IACV-FICD solenoid valve).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace power steering oil
pressure switch or IACV-
FICD solenoid valve.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Power Steering Oil Pressure Switch (Cont’d)
H
H
H
H
H
EC-530
SEF165T
COMPONENT INSPECTION
Power steering oil pressure switch
1.
Disconnect power steering oil pressure switch harness con-
nector then start engine.
2.
Check continuity between terminals
q
1
and
q
2
.
Conditions
Continuity
Steering wheel is being turned
Yes
Steering wheel is not being turned
No
If NG, replace power steering oil pressure switch.
SEF658Q
IACV-FICD solenoid valve
Disconnect IACV-FICD solenoid valve harness connector.
I
Check for clicking sound when applying 12V direct current to
terminals.
SEF097K
I
Check plunger for seizing or sticking.
I
Check for broken spring.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Power Steering Oil Pressure Switch (Cont’d)
EC-531
Electrical Load Signal
TEC794
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
EC-532
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