Infiniti M45 (Y34). Manual — part 77
DTC P1757 FRONT BRAKE SOLENOID VALVE
AT-193
D
E
F
G
H
I
J
K
L
M
A
B
AT
7.
CHECK TCM
1.
Check TCM input/output signal. Refer to
AT-86, "TCM Input/Output Signal Reference Values"
2.
If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.
Component Inspection
ACS00499
FRONT BRAKE SOLENOID VALVE
Resistance Check
1.
Turn ignition switch OFF.
2.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
3.
Disconnect control valve assembly harness connector.
4.
Check resistance between terminal and ground.
5.
If NG, replace control valve assembly. Refer to
.
Operation Check
●
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 8 and ground.
Solenoid Valve
Connector No.
Terminal No.
(Wire color)
Resistance
(Approx.)
Front brake solenoid
valve
F301
8 (Y) - Ground
3 - 9
Ω
SCIA3077E
SCIA3079E
AT-194
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION
PFP:31940
Description
ACS0049A
●
Front brake solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehi-
cle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be
shifted to the optimum position.
●
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference Value
ACS004PK
On Board Diagnosis Logic
ACS0049B
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “FR/B SOLENOID FNCT” with CONSULT-II or P1759 without CONSULT-II is
detected under the following conditions.
–
When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 1 is irregular during depressing accelerator pedal. (Other than during shift change)
–
When TCM detects that relation between gear position and condition of ATF pressure switch 1 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible Cause
ACS0049C
●
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
●
Front brake solenoid valve
●
ATF pressure switch 1
DTC Confirmation Procedure
ACS0049D
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.
Start engine.
2.
Accelerate vehicle to maintain the following condition.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (FR/B ON/OFF)
3.
Perform step “2” again.
4.
Turn ignition switch OFF, then perform step “1” to “3” again.
5.
Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1759) is detected, refer to
If DTC (P1757) is detected, go to
.
If DTC (P1841) is detected, go to
AT-236, "Diagnostic Procedure"
WITH GST
Follow the procedure “With CONSULT-II”.
Item name
Condition
Display value
ATF PRES SW 1
Front brake solenoid valve operates.
ON
Other conditions
OFF
SAT014K
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION
AT-195
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — FR/BF
ACS0049E
TCWA0128E
AT-196
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION
TCM terminal and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS0049F
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA
MONITOR” mode for “A/T” with CONSULT-II.
3.
Accelerate vehicle in “D” position (3rd
Þ
4th gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 1”.
Without CONSULT-II
1.
Start engine.
2.
Accelerate vehicle in the “D” position (3rd
Þ
4th gear).
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
19
R
Front brake sole-
noid valve
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
35
B/Y
PSB2 (ATF pres-
sure switch 1)
When front brake solenoid valve OFF.
Battery voltage
When front brake solenoid valve ON.
0V
Item name
Condition
Display value
ATF PRES SW 1
Front brake solenoid
valve operates.
ON
Other conditions
OFF
PCIA0067E
Solenoid valve
Connector
No.
Terminal No.
(Wire color)
Voltage
Front brake solenoid
valve
OFF
F104
35 (B/Y) - Ground
Battery voltage
ON
Approx. 0 V
PCIA0066E
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