2006 INFINITI FX35 Pressure

TROUBLE DIAGNOSIS AT-93
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Revision: 2006 December 2006 FX35/FX45
L/PRESS SOL/
CIRC

Normal voltage not applied to solenoid due to cut line, short, or
the like

TCM detects as irregular by comparing target value with monitor
value. P0745 P0745
AT- 1 2 9
TP SEN/CIRC A/T
TCM does not receive the proper accelerator pedal position sig-
nals (input by CAN communication) from ECM. P1705 —
AT- 1 3 1
ATF TEMP SEN/
CIRC
During running, the AT fluid temperature sensor signal voltage is
excessively high or low P1710 P0710
AT- 1 3 4
VEH SPD SE/
CIR·MTR
Signal (CAN communication) from vehicle speed sensor MTR not
input due to cut line or the like

Unexpected signal input during running P1721 —
AT- 1 3 9
A/T INTERLOCK
Except during shift change, the gear position and ATF pressure
switch states are monitored and comparative judgement made. P1730 P1730
AT- 1 4 1
A/T 1ST E/BRAK-
ING
Each ATF pressure switch and solenoid current is monitored and
if a pattern is detected having engine braking 1st gear other than
in the M1 position, a malfunction is detected. P1731 —
AT- 1 4 4
I/C SOLENOID/
CIRC

Normal voltage not applied to solenoid due to functional malfunc-
tion, cut line, short, or the like

TCM detects as irregular by comparing target value with monitor
value. P1752 P1752
AT- 1 4 6
I/C SOLENOID
FNCTN

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)

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) P1754
P1754
(*2)AT- 1 4 8
FR/B SOLENOID/
CIRC

Normal voltage not applied to solenoid due to functional malfunc-
tion, cut line, short, or the like

TCM detects as irregular by comparing target value with monitor
value. P1757 P1757
AT- 1 5 0
FR/B SOLENOID
FNCT

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)

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) P1759
P1759
(*2)AT- 1 5 2
D/C SOLENOID/
CIRC

Normal voltage not applied to solenoid due to cut line, short, or
the like

TCM detects as irregular by comparing target value with monitor
value. P1762 P1762
AT- 1 5 4
Items (CONSULT-II
screen terms) Malfunction is detected when... TCM self-
diagnosis OBD-II
(DTC)
Reference page
“A/T” with
CONSULT-
II MIL indica-
tor lamp(*1) ,
“ENGINE”
with CON-
SULT-II or GST

AT-94
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
*1: Refer to EC-68, "Malfunction Indicator Lamp (MIL)" (for VQ35DE engine) or EC-729, "Malfunction Indicator Lamp (MIL)" (for
VK45DE engine. D/C SOLENOID
FNCTN

TCM detects that actual gear ratio is irregular, and relation
between gear position and condition of ATF pressure switch 5 is
irregular during depressing accelerator pedal. (Other than during
shift change)

TCM detects that relation between gear position and condition of
ATF pressure switch 5 is irregular during releasing accelerator
pedal. (Other than during shift change) P1764
P1764
(*2)AT-156
HLR/C SOL/CIRC

Normal voltage not applied to solenoid due to functional malfunc-
tion, cut line, short, or the like

TCM detects as irregular by comparing target value with monitor
value. P1767 P1767
AT-158
HLR/C SOL
FNCTN

TCM detects that actual gear ratio is irregular, and relation
between gear position and condition of ATF pressure switch 6 is
irregular during depressing accelerator pedal. (Other than during
shift change)

TCM detects that relation between gear position and condition of
ATF pressure switch 6 is irregular during releasing accelerator
pedal. (Other than during shift change) P1769
P1769
(*2)AT-160
LC/B SOLENOID/
CIRC
Normal voltage not applied to solenoid due to functional malfunc-
tion, cut line, short, or the like P1772 P1772
AT-162
LC/B SOLENOID
FNCT

TCM detects an improper voltage drop when it tries to operate
the solenoid valve.

Condition of ATF pressure switch 2 is different from monitor
value, and relation between gear position and actual gear ratio is
irregular. P1774
P1774(*2)AT-164
MANU MODE SW/
CIRC
When an impossible pattern of switch signals is detected, a mal-
function is detected. P1815 —
AT-166
ATF PRES SW 1/
CIRC

TCM detects that actual gear ratio is normal, and relation
between gear position and condition of ATF pressure switch 1 is
irregular during depressing accelerator pedal. (Other than during
shift change) P1841 —
AT-171
ATF PRES SW 3/
CIRC

TCM detects that actual gear ratio is normal, and relation
between gear position and condition of ATF pressure switch 3 is
irregular during depressing accelerator pedal. (Other than during
shift change) P1843 —
AT-173
ATF PRES SW 5/
CIRC

TCM detects that actual gear ratio is normal, and relation
between gear position and condition of ATF pressure switch 5 is
irregular during depressing accelerator pedal. (Other than during
shift change) P1845 —
AT-175
ATF PRES SW 6/
CIRC

TCM detects that actual gear ratio is normal, and relation
between gear position and condition of ATF pressure switch 6 is
irregular during depressing accelerator pedal. (Other than during
shift change) P1846 —
AT-177
NO DTC IS
DETECTED FUR-
THER TESTING
MAY BE
REQUIRED

No NG item has been detected. X X —
Items (CONSULT-II
screen terms) Malfunction is detected when... TCM self-
diagnosis OBD-II
(DTC)
Reference page
“A/T” with
CONSULT-
II MIL indica-
tor lamp
(*1) ,
“ENGINE”
with CON-
SULT-II or GST

TROUBLE DIAGNOSIS AT-103
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Revision: 2006 December 2006 FX35/FX45
Judgement Self-diagnosis Code
If there is a malfunction, the lamp lights up for the time corresponding to the suspect circuit.
Erase Self-diagnosis

In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is
stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned ON and OFF.

However, this information is erased by turning ignition switch “OFF” after performing self-diagnostics or by
erasing the memory using the CONSULT-II.
No. Malfunctioning item No. Malfunctioning item
1 Revolution sensor AT- 11 8
10 A/T fluid temperature sensor AT- 1 3 4
2 Direct clutch solenoid valve AT-154 , AT-15611 Turbine revolution sensor AT- 11 6
3 Torque converter clutch solenoid valve AT-125 , AT- 1 2 712 A/T interlock AT- 1 4 1
4 Line pressure solenoid valve AT-12913 A/T 1st engine braking AT-144
5 Input clutch solenoid valve AT- 1 4 6 , AT- 1 4 814 Start signal AT-107
6 Front brake solenoid valve AT- 1 5 0 , AT- 1 5 215 Accelerator pedal position sensor AT- 1 3 1
7 Low coast brake solenoid valve AT- 1 6 2 , AT- 1 6 416 Engine speed signal AT- 1 2 3
8 High and low reverse clutch solenoid valve AT- 1 5 8 , AT- 1 6 017 CAN communication line AT- 1 0 4
9 PNP switch AT- 11 2
SCIA5767E

DTC P0745 LINE PRESSURE SOLENOID VALVE AT-129
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Revision: 2006 December 2006 FX35/FX45
DTC P0745 LINE PRESSURE SOLENOID VALVEPFP:31940
DescriptionNCS001D7
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
CONSULT-II Reference ValueNCS001D8
On Board Diagnosis LogicNCS001D9

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0745 L/PRESS SOL/CIRC” with CONSULT-II or 4th 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 CauseNCS001DA

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

Line pressure solenoid valve
DTC Confirmation ProcedureNCS001DB
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. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Touch “START”.
4. Engine start and wait at least 5 seconds.
5. If DTC is detected, go to “ AT- 1 3 0 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
BCIA0031E

AT-130
DTC P0745 LINE PRESSURE SOLENOID VALVE
Revision: 2006 December 2006 FX35/FX45
Diagnostic ProcedureNCS001DC
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Read out the value of “LINE PRES SOL” 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 7 9 , "
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.

A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 9 , "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform AT- 1 2 9 , "
DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
SCIA4793E

DTC P1730 A/T INTERLOCK AT-141
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Revision: 2006 December 2006 FX35/FX45
DTC P1730 A/T INTERLOCKPFP:00000
DescriptionNCS001ED

Fail-safe function to detect interlock conditions.
On Board Diagnosis LogicNCS001EE

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.
Possible CauseNCS001EF

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

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureNCS001EG
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. (Do not start engine.)
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 2 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Judgement of A/T InterlockNCS001EH
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.
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.
BCIA0031E

AT-142
DTC P1730 A/T INTERLOCK
Revision: 2006 December 2006 FX35/FX45
A/T INTERLOCK COUPLING PATTERN TABLE

: NG, X: OK
Diagnostic ProcedureNCS001EI
1. SELF-DIAGNOSIS
With CONSULT-II
1. Drive vehicle.
2. Stop vehicle and turn ignition switch OFF.
3. Turn ignition switch ON. (Do not start engine.)
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. (Do not start engine.)
4. Perform self-diagnosis. Refer to AT- 1 0 2 , "
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 2 , "
DTC P1772 LOW
COAST BRAKE SOLENOID VALVE" , AT- 1 6 4 , "DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION" .
2. CHECK DTC
Perform AT- 1 4 1 , "
DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 3.
3. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 7 9 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
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 P1731 A/T 1ST ENGINE BRAKING
Revision: 2006 December 2006 FX35/FX45
DTC P1731 A/T 1ST ENGINE BRAKINGPFP:00000
DescriptionNCS001EJ
Fail-safe function to prevent sudden decrease in speed by engine brake other than at M1 position.
CONSULT-II Reference ValueNCS001EK
On Board Diagnosis LogicNCS001EL

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 CauseNCS001EM

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

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureNCS001EN
CAUTION:

Always drive vehicle at a safe speed.

Be careful not to rev engine into 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. (Do not start engine.)
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 5 , "
Diagnostic Procedure" .
Item name Condition Display value
ON OFF SOL Low coast brake engaged. Refer to
AT- 2 2
.ON
Low coast brake disengaged. Refer to AT- 2 2
.OFF
ATF PRES SW 2 Low coast brake engaged. Refer to
AT- 2 2
.ON
Low coast brake disengaged. Refer to AT- 2 2
.OFF
BCIA0031E