Infiniti M45 (Y34). Manual — part 72
DTC P1730 A/T INTERLOCK
AT-173
D
E
F
G
H
I
J
K
L
M
A
B
AT
3.
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.
AT-174
DTC P1731 A/T 1ST ENGINE BRAKING
DTC P1731 A/T 1ST ENGINE BRAKING
PFP:00000
Description
ACS0048K
Fail-safe function to prevent sudden decrease in speed by engine brake other than at M1 position.
CONSULT-II Reference Value
ACS004PG
On Board Diagnosis Logic
ACS0048L
●
This is not an OBD-II self-diagnostic item.
●
Diagnostic trouble code “A/T 1ST E/BRAKING” with CONSULT-II or 13th judgement flicker without CON-
SULT-II is detected under the following condition.
–
When TCM does not receive the proper voltage signal from the sensor.
–
When TCM monitors each pressure switch and solenoid monitor value, and detects as irregular when
engine brake of 1st gear acts other than at M1 position.
Possible Cause
ACS0048M
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
ACS0048N
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 2 consecutive sec-
onds.
ENGINE SPEED: 1,200 rpm
Selector lever: “D” position
Gear position: 1st gear
5.
If DTC is detected, go to
AT-176, "Diagnostic Procedure"
Item name
Condition
Display value
ON OFF SOL
Low coast brake solenoid valve operates.
ON
Other conditions
OFF
ATF PRES SW 2
Low coast brake solenoid valve operates.
ON
Other conditions
OFF
SAT014K
DTC P1731 A/T 1ST ENGINE BRAKING
AT-175
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — E/BRE
ACS0048O
TCWA0124E
AT-176
DTC P1731 A/T 1ST ENGINE BRAKING
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS0048P
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.
3.
Accelerate vehicle in “D” position (1st gear), and confirm the
ON/OFF actuation of the “ATF PRES SW 2” and “ON OFF SOL”.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
13
W/L
Low coast brake
solenoid valve
When
vehicle
cruises
When the solenoid valve is operating (when running in M1-1
gear or M2-2 gear)
Battery voltage
When the solenoid valve is not operating (when running in “D”)
0V
16
W/G
SEL1 (ATF pres-
sure switch 2)
–
–
40
Y/G
DATA BIT1
–
–
Item name
Condition
Display value
ON OFF SOL
Low coast brake solenoid
valve operates.
ON
Other conditions
OFF
ATF PRES SW 2
Low coast brake solenoid
valve operates.
ON
Other conditions
OFF
SCIA4670E
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