Infiniti Q45 (FY33). Manual — part 32
SAT341H
Line Pressure Solenoid Valve
DESCRIPTION
The line pressure solenoid valve regulates the oil pump discharge
pressure to suit the driving condition in response to a signal sent
from the TCM.
The line pressure duty cycle value is not consistent when the
closed throttle position switch is “ON”. To confirm the line
pressure duty cycle at low pressure, the accelerator (throttle)
should be open until the closed throttle position switch is
“OFF”.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Line pressure solenoid valve duty
Small throttle opening
(Low line pressure)
"
Large throttle opening
(High line pressure)
Approximately 29%
"
Approximately 95%
Note: The line pressure duty cycle value is not consistent when the closed throttle position switch is “ON”. To confirm the line
pressure duty cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is
“OFF”.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
1
G/R
Line pressure
solenoid valve
When releasing accelerator pedal
after warming up engine.
1.5 - 2.5V
When depressing accelerator pedal
fully after warming up engine.
0V
2
W/B
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal
after warming up engine.
5 - 14V
When depressing accelerator pedal
fully after warming up engine.
0V
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: L/PRESS SOL/CIRC
TCM detects an improper voltage drop
when it tries to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or
shorted.)
I
Line pressure solenoid valve
: P0745
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0745
AT-125
SAT014K
SEF949Y
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1)
Turn ignition switch “ON” and select “DATA MONITOR”
mode for “ENGINE” with CONSULT-II.
2)
Depress accelerator pedal completely and wait at least
1 second.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II”.
TROUBLE DIAGNOSIS FOR DTC P0745
Line Pressure Solenoid Valve (Cont’d)
AT-126
SAT546I
SAT388J
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “OFF” position.
2. Disconnect terminal cord assembly con-
nector at the end of A/T assembly.
3. Check resistance between terminal
q
6
and ground.
Resistance: 2.5 - 5
Ω
OK
E
NG
1. Remove control valve
assembly. Refer to
AT-195.
2. Check the following
items:
I
Line pressure solenoid
valve
Refer to “Component
Inspection”, AT-128.
I
Harness of terminal
cord assembly for
short or open
CHECK POWER SOURCE CIRCUIT.
1. Turn ignition switch to “OFF” position.
2. Disconnect TCM harness connector.
3. Check resistance between terminal
q
6
and TCM harness connector terminal
q
2
.
Resistance: 11.2 - 12.8
Ω
OK
E
NG
Check the following items:
I
Dropping resistor
Refer to “Component
Inspection”, AT-128.
I
Harness for short or
open between TCM ter-
minal
q
2
and terminal
cord assembly (Main
harness)
CHECK POWER SOURCE CIRCUIT.
1. Turn ignition switch to “OFF” position.
2. Check continuity between terminal
q
6
and TCM harness connector terminal
q
1
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
3. Reinstall any part removed.
OK
E
NG
Repair open circuit or short
to ground or short to power
in harness or connectors.
Perform DIAGNOSTIC TROUBLE CODE
(DTC) CONFIRMATION PROCEDURE,
AT-126.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0745
Line Pressure Solenoid Valve (Cont’d)
H
H
H
H
H
AT-127
SAT548I
COMPONENT INSPECTION
Line pressure solenoid valve
I
For removal, refer to AT-195.
Resistance check
I
Check resistance between two terminals.
Solenoid valve
Terminal No.
Resistance
(Approx.)
Line pressure
solenoid valve
q
6
Ground
2.5 - 5
Ω
SAT549I
Operation check
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
SAT550I
Dropping resistor
I
Check resistance between two terminals.
Resistance: 11.2 - 12.8
Ω
TROUBLE DIAGNOSIS FOR DTC P0745
Line Pressure Solenoid Valve (Cont’d)
AT-128
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