Infiniti M35/M45 Y50. Manual — part 55
DTC P1730 A/T INTERLOCK
AT-143
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Judgement of A/T Interlock
NCS001MX
When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear, and should be set
in a condition in which it can travel.
When one of the following fastening patterns is detected, the fail-safe function in correspondence with the indi-
vidual pattern should be performed.
A/T INTERLOCK COUPLING PATTERN TABLE
●
: NG, X: OK
Diagnostic Procedure
NCS001MY
1.
CHECK SELF-DIAGNOSTIC RESULTS
With CONSULT-II
1.
Drive vehicle.
2.
Stop vehicle and turn ignition switch OFF.
3.
Turn ignition switch ON.
4.
Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
Without CONSULT-II
1.
Drive vehicle.
2.
Stop vehicle and turn ignition switch OFF.
3.
Turn ignition switch ON.
4.
Perform self-diagnosis. Refer to
AT-103, "TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)"
OK or NG
OK
>> GO TO 2.
NG
>> Check low coast brake solenoid valve circuit and function. Refer to
AT-165, "DTC P1774 LOW COAST BRAKE SOLENOID
2.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-142, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
Gear position
ATF pressure switch output
Fail-safe
function
Clutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)
SW6
(HLR/
C)
SW5
(D/C)
SW1
(FR/B)
SW2
(LC/B)
I/C
HLR/C
D/C
FR/B
LC/B
L/U
A/T interlock
coupling pat-
tern
3rd
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
4th
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
5th
X
X
–
X
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
BCIA0031E
AT-144
DTC P1730 A/T INTERLOCK
3.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-180, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
4.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-236, "Control Valve With TCM and A/T Fluid
NG
>> Repair or replace damaged parts.
DTC P1731 A/T 1ST ENGINE BRAKING
AT-145
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DTC P1731 A/T 1ST ENGINE BRAKING
PFP:00000
Description
NCS001MZ
Fail-safe function to prevent sudden decrease in speed by engine brake other than at M1 position.
CONSULT-II Reference Value
NCS001N0
On Board Diagnosis Logic
NCS001N1
●
This is not an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1731 A/T 1ST E/BRAKING” with CONSULT-II or 13th judgement flicker without
CONSULT-II is detected under the following conditions.
–
When TCM does not receive the proper voltage signal from the sensor.
–
When TCM monitors each ATF pressure switch and solenoid monitor value, and detects as irregular when
engine brake of 1st gear acts other than at M1 position.
Possible Cause
NCS001N2
●
Harness or connectors
(Sensor circuit is open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
NCS001N3
CAUTION:
●
Always drive vehicle at a safe speed.
●
Be careful not to rev engine into the red zone on the tachometer.
NOTE:
If “DTC Confirmation Procedure” has been previously preformed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “ENGINE SPEED
”, “MANU MODE SW” and “GEAR”.
3.
Touch “START”.
4.
Start engine.
5.
Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
ENGINE SPEED: 1,200 rpm
MANU MODE SW: ON
GEAR: “1” position
6.
AT-146, "Diagnostic Procedure"
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
ATF PRES SW 2
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
BCIA0030E
AT-146
DTC P1731 A/T 1ST ENGINE BRAKING
Diagnostic Procedure
NCS001N4
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.
Drive vehicle in the “M” position (1st gear), and confirm the ON/
OFF actuation of “ATF PRES SW 2” and “ON OFF SOL”.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-180, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-236, "Control Valve With TCM and A/T Fluid
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-145, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
ATF PRES
SW 2
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
SCIA4670E
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