2007 INFINITI M35 ignition

AT-140
DTC P1721 VEHICLE SPEED SENSOR MTR
Revision: 2007 April2007 M35/M45
DTC P1721 VEHICLE SPEED SENSOR MTRPFP:24814
DescriptionNCS001MN
The vehicle speed sensor·MTR signal is transmitted from combination meter to TCM by CAN communication
line. The signal functions as an auxiliary device to the revolution sensor when it is malfunctioning. The TCM
will then use the vehicle speed sensor·MTR signal.
CONSULT-II Reference ValueNCS001MO
On Board Diagnosis LogicNCS001MP

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “P1721 VHE SPD SE/CIR-MTR” with CONSULT-II is detected when TCM does
not receive the proper vehicle speed sensor MTR signal (input by CAN communication) from unified
meter and A/C amp.
Possible CauseNCS001MQ
Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureNCS001MR
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, 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 “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POSI: 1.0/8 or less
VHCL/S SE-MTR: 30 km/h (17 MPH) or more
5. If DTC is detected, go to AT- 1 4 1 , "
Diagnostic Procedure" .
Item name Condition Display value
VHCL/S SE-MTR During driving Approximately matches the speedometer reading.
BCIA0030E

AT-142
DTC P1730 A/T INTERLOCK
Revision: 2007 April2007 M35/M45
DTC P1730 A/T INTERLOCKPFP:00000
DescriptionNCS001MT
Fail-safe function to detect interlock conditions.
On Board Diagnosis LogicNCS001MU

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1730 A/T INTERLOCK” with CONSULT-II or 12th judgement flicker without
CONSULT-II is detected when TCM does not receive the proper voltage signal from the sensor and
switch.

TCM monitors and compares gear position and conditions of each ATF pressure switch when gear is
steady.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed, but
this is not a turbine revolution sensor malfunction.
Possible CauseNCS001MV

Harness or connectors
(Solenoid and switch circuit is open or shorted.)

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureNCS001MW
NOTE:
If “DTC Confirmation Procedure” has been previously performed, 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 “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Touch “START”.
4. Start engine.
5. Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
SLCT LVR POSI: “D” position
6. If DTC is detected, go to AT- 1 4 3 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
BCIA0030E

DTC P1730 A/T INTERLOCK
AT-143
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: 2007 April2007 M35/M45
Judgement of A/T InterlockNCS001MX
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 ProcedureNCS001MY
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- 1 0 3 , "
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- 1 6 3 , "
DTC P1772 LOW
COAST BRAKE SOLENOID VALVE" , AT- 1 6 5 , "DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION" .
2. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to AT- 1 4 2 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
Gear positionATF pressure switch output
Fail-safe
functionClutch 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-
tern3rd – X X –
Held in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –
Held in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – X
Held in
2nd gearOFF OFF ON OFF OFF OFF
BCIA0031E

DTC P1731 A/T 1ST ENGINE BRAKING
AT-145
D
E
F
G
H
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K
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MA
B
AT
Revision: 2007 April2007 M35/M45
DTC P1731 A/T 1ST ENGINE BRAKINGPFP:00000
DescriptionNCS001MZ
Fail-safe function to prevent sudden decrease in speed by engine brake other than at M1 position.
CONSULT-II Reference ValueNCS001N0
On Board Diagnosis LogicNCS001N1

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 CauseNCS001N2

Harness or connectors
(Sensor circuit is open or shorted.)

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureNCS001N3
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. If DTC is detected, go to AT- 1 4 6 , "
Diagnostic Procedure" .
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 2 1
.ON
Low coast brake disengaged. Refer to AT- 2 1
.OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 2 1
.ON
Low coast brake disengaged. Refer to AT- 2 1
.OFF
BCIA0030E

DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-147
D
E
F
G
H
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J
K
L
MA
B
AT
Revision: 2007 April2007 M35/M45
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionNCS001N5
Input clutch 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 ValueNCS001N6
On Board Diagnosis LogicNCS001N7

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1752 I/C SOLENOID/CIRC” with CONSULT-II or 5th judgement flicker 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 CauseNCS001N8

Harness or connectors
(Solenoid circuit is open or shorted.)

Input clutch solenoid valve
DTC Confirmation ProcedureNCS001N9
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, 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 “ACCELE POSI”,
“SLCT LVR POSI” and “GEAR”.
3. Touch “START”.
4. Start engine.
5. Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “3”
“4” (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
6. If DTC is detected go to AT- 1 4 8 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 1
. 0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 1
. 0 - 0.05 A
BCIA0030E

AT-148
DTC P1752 INPUT CLUTCH SOLENOID VALVE
Revision: 2007 April2007 M35/M45
Diagnostic ProcedureNCS001NA
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch ON.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Start engine.
4. Read out the value of “I/C SOLENOID” while driving.
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- 1 8 0 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
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- 2 3 6 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to AT- 1 4 7 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name ConditionDisplay value
(Approx.)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 1
. 0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 1
. 0 - 0.05 ASCIA4793E

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
AT-149
D
E
F
G
H
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K
L
MA
B
AT
Revision: 2007 April2007 M35/M45
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONPFP:31940
DescriptionNCS001NB

Input clutch 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 ValueNCS001NC
On Board Diagnosis LogicNCS001ND

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1754 I/C SOLENOID FNCTN” with CONSULT-II or 5th judgement flicker with-
out 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 3 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 3 is irregular
during releasing accelerator pedal. (Other than during shift change.)
Possible CauseNCS001NE

Harness or connectors
(Solenoid and switch circuits are open or shorted.)

Input clutch solenoid valve

ATF pressure switch 3
DTC Confirmation ProcedureNCS001NF
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, 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. Start engine.
2. Accelerate vehicle to maintain the following conditions.
ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “3”
“4” (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
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 (P1754) is detected, go to AT- 1 5 0 , "
Diagnostic Procedure" .
If DTC (P1752) is detected, go to AT- 1 4 8 , "
Diagnostic Procedure" .
If DTC (P1843) is detected, go to AT- 1 7 5 , "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 1
. 0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 1
. 0 - 0.05 A
ATF PRES SW 3Input clutch engaged. Refer to AT- 2 1
.ON
Input clutch disengaged. Refer to AT- 2 1
.OFF
BCIA0030E

DTC P1757 FRONT BRAKE SOLENOID VALVE
AT-151
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: 2007 April2007 M35/M45
DTC P1757 FRONT BRAKE SOLENOID VALVEPFP:31940
DescriptionNCS001NH
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 ValueNCS001NI
On Board Diagnosis LogicNCS001NJ

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1757 FR/B SOLENOID/CIRC” with CONSULT-II or 6th judgement flicker with-
out 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 CauseNCS001NK

Harness or connectors
(Solenoid circuit is open or shorted.)

Front brake solenoid valve
DTC Confirmation ProcedureNCS001NL
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, 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 “ACCELE POSI”,
“SLCT LVR POSI” and “GEAR”.
3. Touch “START”.
4. Start engine.
5. Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “3”
“4” (FR/B ON/OFF)
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
6. If DTC is detected go to AT- 1 5 2 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
FR/B SOLENOIDFront brake engaged. Refer to AT- 2 1
. 0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 1
. 0 - 0.05 A
BCIA0030E