2008 INFINITI FX35 Service Manual

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Page 193 of 3924

INFINITI FX35 2008 Service Manual
AT-120
< SERVICE INFORMATION >
DTC P0734 A/T 4TH GEAR FUNCTION
DTC P0734 A/T 4TH GEAR FUNCTION
DescriptionINFOID:0000000001375127
This malfunction is detected when the A/T does not shift into 4th gea

AT-120
< SERVICE INFORMATION >
DTC P0734 A/T 4TH GEAR FUNCTION
DTC P0734 A/T 4TH GEAR FUNCTION
DescriptionINFOID:0000000001375127
This malfunction is detected when the A/T does not shift into 4th gear position as instructed by TCM. This is
not only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such
as control valve sticking, improper solenoid valve operation.
On Board Diagn osis LogicINFOID:0000000001375128
Diagnostic trouble code “P0734 A/T 4TH GR FNCTN” with CONSULT-III or 21st judgment flicker without CON-
SULT-III is detected when TCM detects any inconsistency in the actual gear ratio.
Possible CauseINFOID:0000000001375129
Harness or connectors
(Solenoid circuits are open or shorted.)
Input clutch solenoid valve
Front brake solenoid valve
Direct clutch solenoid valve
High and low reverse clutch solenoid valve
Each clutch
Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001375130
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start the engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that “ATF TEMP 1” is within the following range. ATF TEMP 1: 20 °C – 140 °C
If out of range, drive vehicle to warm ATF or stop engine to cool ATF.
3. Select “4TH GR FNCTN P0734” of “DTC WORK SUPPORT” mode for “TRANSMISSION” with CON-
SULT-III.
4. Drive vehicle and maintain the following conditions.
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACCELE POSI: 0.6/8 or more
ENGINE SPEED: TURBINE REV − 50 rpm or more
TURBINE REV: 300 rpm or more
GEAR: “4” position
MANU MODE SW: ON
5. Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from
“OUT OF CONDITION” to “TESTING”.
CAUTION:
If “TESTING” does not ap pear on CONSULT-III for a long ti me, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0734 is shown, refer to “ AT-84, "
CONSULT-III Function (TRANSMIS-
SION)"”.
If “COMPLETED RESULT NG” is detected, go to AT-121, "
Diagnosis Procedure".
If “STOP VEHICLE” is detect ed, go to the following step.
6. Stop vehicle.
7. Drive vehicle in “D” position allowing it to shift fr om 1st to 5th gear and check shift timing and shift shock.
- Touch “OK” to complete the inspection when normally shifted from the 1st to 5th gear.
- Touch “NG” when an unusual shift shock, etc. occurs in spite of shifting from the 1st to 5th gear. Go to AT-
49, "Inspections Before Trouble Diagnosis".
- Perform AT-84, "
CONSULT-III Function (TRANSMISSION)" when not shifted from the 1st to 5th gear.
(Neither “OK” nor “NG” are indicated.)
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 194 of 3924

INFINITI FX35 2008 Service Manual
DTC P0734 A/T 4TH GEAR FUNCTIONAT-121
< SERVICE INFORMATION >
DE
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M A
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AT
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Diagnosis ProcedureINFOID:0000000001375131
1.CHECK CAN COMMUNICATION LINE
With CONSULT-III
Perform se

Page 195 of 3924

INFINITI FX35 2008 Service Manual
AT-122
< SERVICE INFORMATION >
DTC P0735 A/T 5TH GEAR FUNCTION
DTC P0735 A/T 5TH GEAR FUNCTION
DescriptionINFOID:0000000001375132
This malfunction is detected when the A/T does not shift into 5th gea

AT-122
< SERVICE INFORMATION >
DTC P0735 A/T 5TH GEAR FUNCTION
DTC P0735 A/T 5TH GEAR FUNCTION
DescriptionINFOID:0000000001375132
This malfunction is detected when the A/T does not shift into 5th gear position as instructed by TCM. This is
not only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such
as control valve sticking, improper solenoid valve operation.
On Board Diagn osis LogicINFOID:0000000001375133
Diagnostic trouble code “P0735 A/T 5TH GR FNCTN” wit h CONSULT-III or 22nd judgment flicker without
CONSULT-III is detected when TCM detects any inconsistency in the actual gear ratio.
Possible CauseINFOID:0000000001375134
Harness or connectors
(Solenoid circuits are open or shorted.)
Input clutch solenoid valve
Front brake solenoid valve
Direct clutch solenoid valve
High and low reverse clutch solenoid valve
Each clutch
Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001375135
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start the engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that “ATF TEMP 1” is within the following range. ATF TEMP 1: 20 °C – 140 °C
If out of range, drive vehicle to warm ATF or stop engine to cool ATF.
3. Select “5TH GR FNCTN P0735” of “DTC WORK SUPPORT” mode for “TRANSMISSION” with CON-
SULT-III.
4. Drive vehicle and maintain the following conditions.
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACCELE POSI: 0.6/8 or more
ENGINE SPEED: TURBINE REV − 50 rpm or more
TURBINE REV: 300 rpm or more
GEAR: “5” position
MANU MODE SW: ON
5. Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from
“OUT OF CONDITION” to “TESTING”.
CAUTION:
If “TESTING” does not ap pear on CONSULT-III for a long ti me, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0735 is shown, refer to “ AT-84, "
CONSULT-III Function (TRANSMIS-
SION)"”.
If “COMPLETED RESULT NG” is detected, go to AT-123, "
Diagnosis Procedure".
If “STOP VEHICLE” is detect ed, go to the following step.
6. Stop vehicle.
7. Drive vehicle in “D” position allowing it to shift fr om 1st to 5th gear and check shift timing and shift shock.
- Touch “OK” to complete the inspection when normally shifted from the 1st to 5th gear.
- Touch “NG” when an unusual shift shock, etc. occurs in spite of shifting from the 1st to 5th gear. Go to AT-
49, "Inspections Before Trouble Diagnosis".
- Perform AT-84, "
CONSULT-III Function (TRANSMISSION)" when not shifted from the 1st to 5th gear.
(Neither “OK” nor “NG” are indicated.)
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 196 of 3924

INFINITI FX35 2008 Service Manual
DTC P0735 A/T 5TH GEAR FUNCTIONAT-123
< SERVICE INFORMATION >
DE
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Diagnosis ProcedureINFOID:0000000001375136
1.CHECK CAN COMMUNICATION LINE
With CONSULT-III
Perform se

Page 197 of 3924

INFINITI FX35 2008 Service Manual
AT-124
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000001327209
The torque converter clutch solen

AT-124
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000001327209
The torque converter clutch solenoid va lve is activated, with the gear in D5, M3, M4 and M5 by the TCM in
response to signals sent from the vehicle speed sensor and accelerator pedal position sensor (throttle posi-
tion sensor). Torque converter clutch piston operation will then be controlled.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 1. 0/8) in lock-up condition, the engine speed should not
change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327210
On Board Diagnosis LogicINFOID:0000000001327211
Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-III or 3rd judgement flicker without
CONSULT-III 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 CauseINFOID:0000000001327212
Torque converter clutch solenoid valve
Harness or connectors (Solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001327213
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “VHCL/S SE-A/T”, “ACCELE POSI” and “SLCT LVR POSI”.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 5 consecutive seconds. VHCL/S SE-A/T: 80 km/h (50 MPH) or more
ACCELE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
5. If DTC is detected go to AT-124, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001327214
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
Item name Condition Display value (Approx.)
TCC SOLENOID Slip lock-up is active 0.2 - 0.4 A
Lock-up is active 0.4 - 0.6 A
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 198 of 3924

INFINITI FX35 2008 Service Manual
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-125
< SERVICE INFORMATION >
D E
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AT
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2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with C

Page 199 of 3924

INFINITI FX35 2008 Service Manual
AT-126
< SERVICE INFORMATION >
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DescriptionINFOID:0000000001327215
This malfunction is detected when the A/T does not

AT-126
< SERVICE INFORMATION >
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DescriptionINFOID:0000000001327215
This malfunction is detected when the A/T does not shift into 5th gear position or the torque converter clutch
does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or
shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation,
etc.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327216
On Board Diagn osis LogicINFOID:0000000001327217
Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” wit h CONSULT-III or 3rd judgement flicker without
CONSULT-III is detected under the following conditions.
When A/T cannot perform lock-up even if electrical circuit is good.
When TCM detects as irregular by comparing difference value with slip rotation.
Possible CauseINFOID:0000000001327218
Harness or connectors (Solenoid circuit is open or shorted.)
Torque converter clutch solenoid valve
Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001327219
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start engine.
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Drive vehicle and maintain the following conditions for at least 30 consecutive seconds. ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
TCC SOLENOID: 0.4 - 0.6 A
VEHICLE SPEED: 80 km/h (50 MPH) or more
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
4. If DTC is detected, go to AT-126, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001327220
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select “MAIN SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start the engine.
Item name Condition Display value (Approx.)
TCC SOLENOID Slip lock-up is active 0.2 - 0.4 A
Lock-up is active 0.4 - 0.6 A
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 200 of 3924

INFINITI FX35 2008 Service Manual
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-127
< SERVICE INFORMATION >
D E
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4. Read out the value of “TCC SOLENOID” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO

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