Infiniti M45 (Y34). Manual — part 76
DTC P1757 FRONT BRAKE SOLENOID VALVE
AT-189
D
E
F
G
H
I
J
K
L
M
A
B
AT
DTC P1757 FRONT BRAKE SOLENOID VALVE
PFP:31940
Description
ACS00493
Front brake solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference Value
ACS004PJ
On Board Diagnosis Logic
ACS00494
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “FR/B SOLENOID/CIRC” with CONSULT-II or P1757 without CONSULT-II is
detected under the following conditions.
–
When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–
When TCM detects as irregular by comparing target value with monitor value.
Possible Cause
ACS00495
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Front brake solenoid valve
DTC Confirmation Procedure
ACS00496
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine.
4.
Maintain the following conditions for at least 5 consecutive sec-
onds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (FR/B ON/OFF)
5.
If DTC is detected go to
AT-191, "Diagnostic Procedure"
WITH GST
Follow the procedure “With CONSULT-II”.
Item name
Condition
Display value (Approx.)
FR/B SOLENOID
Front brake solenoid valve operates.
0.6 - 0.8 A
Other conditions
0 - 0.05 A
SAT014K
AT-190
DTC P1757 FRONT BRAKE SOLENOID VALVE
Wiring Diagram — AT — FR/B
ACS00497
TCWA0127E
DTC P1757 FRONT BRAKE SOLENOID VALVE
AT-191
D
E
F
G
H
I
J
K
L
M
A
B
AT
TCM terminal and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS00498
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Read out the value of “FR/B SOLENOID” while driving.
Without CONSULT-II
1.
Start engine.
2.
Check voltage between TCM connector and ground.
OK or NG
OK >> GO
TO
6.
NG
>> GO TO 2.
2.
CHECK FRONT BRAKE SOLENOID VALVE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect A/T unit assembly harness connector at the trans-
mission right side.
3.
Check the resistance between terminal and ground.
OK or NG
OK >> GO
TO
5.
NG
>> GO TO 3.
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
19
R
Front brake sole-
noid valve
When
vehicle
starts
When the solenoid valve is operating (other than 4th gear)
More than 2.0V
When the solenoid valve is not operating (4th gear)
0V
Item name
Condition
Display value (Approx.)
FR/B SOLENOID
Front brake solenoid
valve operates.
0.6 - 0.8 A
Other conditions
0 - 0.05 A
SCIA4462E
Item
Con-
nector
No.
Terminal
No.
Condition
Data
(Approx.)
Front
brake
solenoid
valve
F103
19 (R) -
Ground
When
vehicle
cruises
When the solenoid
valve is operating
(other than 4th gear)
More than
2.0V
When the solenoid
valve is not operating
(4th gear)
0V
SCIA4574E
Solenoid valve
Connector No.
Terminal No.
Resistance (Approx.)
Front brake solenoid
valve
F27
5 - Ground
3 - 9
Ω
SCIA1839E
AT-192
DTC P1757 FRONT BRAKE SOLENOID VALVE
3.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
2.
Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3.
Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.
4.
If OK, check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK VALVE RESISTANCE
Check valve resistance
●
Refer to
AT-193, "Component Inspection"
OK or NG
OK >> GO
TO
6.
NG
>> Replace the control valve assembly. Refer to
AT-312, "Control Valve Assembly"
5.
CHECK POWER SOURCE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect TCM connector.
3.
Check continuity between A/T unit assembly harness connector
and TCM connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-189, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F27
5 (W/R)
Yes
Control valve assem-
bly harness connec-
tor
F301
8 (W/R)
SCIA3076E
Item
Connector No.
Terminal No.
(Wire color)
Continuity
TCM
F103
19 (R)
Yes
A/T unit assembly harness
connector
F27
5 (R)
SCIA1840E
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