2008 NISSAN LATIO service

DTC P0734 A/T 4TH GEAR FUNCTION
AT-115
< SERVICE INFORMATION >
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WITH CONSULT-III
1. Start engine and select “DATA MONITOR” mode for “A/T” with CONSULT-III.
2. Touch “START”.
3. Make sure that output voltage of A/T fluid temperature sensor is within the range below.
FLUID TEMP SE: 0.4 - 1.5 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the
voltage (cool down the fluid).
4. Select “4TH GR FNCTN P0734” of “DTC WORK SUPPORT” mode for “A/T” with CONSULT-III and touch
“START”.
5. Accelerate vehicle to 55 to 65 km/h (34 to 40 MPH) under the following conditions and release the accel-
erator pedal completely.
THROTTLE POSI: Less than 5.5/8 (at all times during step 4)
SLCT LVR POSI: “D” position
-Make sure that “GEAR” shows “3” after releasing pedal.
6. Depress accelerator pedal steadily with 1.0/8 - 2.0/8 of “THROTTLE POSI” from a speed of 55 to 65 km/h
(34 to 40 MPH) until “TESTING” has turned to “STOP VEHICLE” or “COMPLETED”. (It will take approxi-
mately 3 seconds.)
If the check result NG appears on CONSULT-III screen, go to AT-115, "
Diagnosis Procedure".
If “STOP VEHICLE” appears on CONSULT-III screen, go to following step.
-Make sure that “GEAR” shows “4” when depressing accelerator pedal with 1.0/8 - 2.0/8 of
“THROTTLE POSI”.
-If “TESTING” does not appear on CONSULT-III for a long time, select “SELF-DIAG RESULTS” for
“A/T”. In case a DTC other than “P0734 A/T 4TH GR FNCTN” is shown, refer to AT-73, "
CONSULT-
III Function (A/T)".
7. Stop vehicle.
8. Follow the instruction displayed. (Check for normal shifting referring to the table below.)
9. Make sure that “OK” is displayed. (If “NG” is displayed, refer to “Diagnostic Procedure”.)
Refer to AT-115, "
Diagnosis Procedure".
Refer to AT-61, "
Vehicle Speed at Which Gear Shifting Occurs".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001703251
1.CHECK SHIFT-UP (D3 TO D4)
During AT-55, "
Cruise Test - Part 1".
Does A/T shift from D
3 to D4 at the specified speed?
YES >> GO TO 11.
NO >> GO TO 2.
2.CHECK LINE PRESSURE
Perform line pressure test. Refer to AT-48, "
Inspections Before Trouble Diagnosis".
OK or NG
OK >> GO TO 3.
NG >> GO TO 7.
Vehicle condition Gear on actual transmission shift pattern when screen is changed to 1 → 2 → 3 → 4
No malfunction exists 1 → 2 → 3 → 4
Malfunction for “A/T 4TH GR FNCTN” exists.2 → 2 → 3 → 3
1 → 2 → 2 → 1
SCIA7190E

AT-116
< SERVICE INFORMATION >
DTC P0734 A/T 4TH GEAR FUNCTION
3.CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to AT-216, "
Control Valve Assembly and Accumulators".
- Shift solenoid valve A
- Shift solenoid valve B
2. Check resistance between terminal cord assembly harness con-
nector terminals and ground. Refer to AT-135, "
Wiring Diagram -
AT - SSV/A" and AT-140, "Wiring Diagram - AT - SSV/B".
OK or NG
OK >> GO TO 4.
NG >> Replace solenoid valve assembly.
4.CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to AT-216, "
Control Valve Assembly and Accumulators".
- Shift solenoid valve A
- Shift solenoid valve B
2. Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals and ground. Refer to
AT-135, "
Wiring Diagram - AT - SSV/A" and AT-140, "Wiring Dia-
gram - AT - SSV/B".
OK or NG
OK >> GO TO 5.
NG >> Replace solenoid valve assembly.
5.CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-263, "
Control Valve Assembly".
2. Check to ensure that:
Solenoid valve Connector Terminal Resistance (Approx.)
Shift solenoid valve A
F302 - Ground 20 - 30 Ω
Shift solenoid valve B 1 - Ground 5 - 20 Ω
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DTC P0734 A/T 4TH GEAR FUNCTION
AT-117
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- Valve, sleeve and plug slide along valve bore under their own weight.
- Valve, sleeve and plug are free from burrs, dents and scratches.
- Control valve springs are free from damage, deformation and fatigue.
- Hydraulic line is free from obstacles.
OK or NG
OK >> GO TO 6.
NG >> Repair control valve.
6.CHECK SHIFT-UP (D3 TO D4)
During AT-55, "
Cruise Test - Part 1".
Does A/T shift from D
3 to D4 at the specified speed?
YES >> GO TO 11.
NO >> Check control valve again. Repair or replace control
valve assembly.
7.CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to AT-216, "
Control Valve Assembly and Accumulators".
- Line pressure solenoid valves
2. Check resistance between terminal cord assembly harness con-
nector terminal and ground. Refer to AT-130, "
Wiring Diagram -
AT - L P S V".
OK or NG
OK >> GO TO 8.
NG >> Replace solenoid valve assembly.
8.CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to AT-216, "
Control Valve Assembly and Accumulators".
- Line pressure solenoid valves
2. Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground. Refer to AT-
130, "Wiring Diagram - AT - LPSV".
OK or NG
OK >> GO TO 9.
NG >> Replace solenoid valve assembly.
9.CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT-263, "
Control Valve Assembly".
2. Check line pressure circuit valves for sticking.
- Pilot valve
- Shift solenoid valve A
- Shift solenoid valve B
OK or NG
OK >> GO TO 10.
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Solenoid valve Connector Terminal Resistance (Approx.)
Line pressure solenoid
valveF30 4 - Ground 2.5 - 5 Ω
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AT-118
< SERVICE INFORMATION >
DTC P0734 A/T 4TH GEAR FUNCTION
NG >> Repair control valve.
10.CHECK SHIFT-UP (D3 TO D4)
During AT-55, "
Cruise Test - Part 1".
Does A/T shift from D
3 to D4 at the specified speed?
YES >> GO TO 11.
NO >> Check control valve again. Repair or replace control
valve assembly.
11 .CHECK DTC
Perform AT-114, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> Perform AT-55, "
Cruise Test - Part 1" again and return to the start point of this test group.
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-119
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000001703252
• The torque converter clutch solenoid valve is activated, with the gear in D4 and D3, by the TCM in response
to signals sent from the vehicle speed sensor and the ECM (throttle opening). Lock-up 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 2/8) on lock-up condition, the engine speed should not
change abruptly. If there is an abrupt change in engine speed, there is no lock-up.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703253
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703254
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0740 T/C CLUTCH SOL/V” with CONSULT-III or 7th judgement flicker without
CONSULT-III is detected when TCM detects an improper voltage drop while it tries to operate solenoid
valve.
Possible CauseINFOID:0000000001703255
• Torque converter clutch solenoid valve
• Harness or connector
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001703256
CAUTION:
• Always drive vehicle at a safe speed.
• If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait at
least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-III and wait at least 1 second.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VEHICLE SPEED: 80 km/h (50 MPH) or more
THROTTLE 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 the check result is NG, go to AT-121, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle in D
1→ D2→ D3→ D4→ D4 lock-up position.
3. Perform self-diagnosis. Refer to AT-78, "
Diagnosis Procedure without CONSULT-III" .
4. If the check result is NG, go to AT-121, "
Diagnosis Procedure" .
Item name Condition Display value (Approx)
TCC S/V DUTY Lock-up OFF ⇔ Lock-up ON 4% ⇔ 94%

AT-120
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Wiring Diagram - AT - TCV
INFOID:0000000001703257
TCM TERMINALS AND REFERENCE VALUES
Refer to AT-71, "TCM Terminal and Reference Value".
BCWA0653E

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-121
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Diagnosis ProcedureINFOID:0000000001703258
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-III.
3. Read out the value of “TCC S/V DUTY” while driving. Check the value changes according to driving
speed.
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
3. CHECK HARNESS BETWEEN TCM AND TERMINAL CORD ASSEMBLY HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly harness connector and TCM connector.
Monitor item ConditionDisplay value
(Approx)
TCC S/V DUTY Lock-up OFF ⇔ Lock-up ON 4 % ⇔ 94 %
NameConnec-
torTerminal ConditionJudgement
standard
(Approx.)
To r q u e c o n -
verter clutch
solenoid
valveE31 3 - GroundWhen A/T performs lock-
up.8 - 15 V
When A/T does not per-
form lock-up.0 V
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Solenoid Valve Connector Terminal Resistance (Approx.)
Torque converter clutch
solenoid valveE31 3 - Ground 5 - 20 Ω
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AT-122
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
3. Check continuity between terminal cord assembly harness con-
nector terminal and TCM connector terminal.
4. If OK, check harness for short to ground and short to power.
5. If OK, check continuity between ground and transaxle assembly.
6. Reinstall any part removed.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly connector in engine room.
3. Check resistance between terminal cord assembly harness con-
nector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.CHECK DTC
Perform AT-119, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6.CHECK TCM
1. Check TCM input/output signal. Refer to AT-71, "
TCM Terminal and Reference Value" .
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.
Component InspectionINFOID:0000000001703259
TORQUE CONVERTER CLUTCH SOLENOID VALVE
• For removal, refer to AT-216, "Control Valve Assembly and Accumulators" .
Resistance Check
Item Connector Terminal Continuity
TCM E31 3
Ye s
Terminal cord assembly
harness connectorF30 5
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Solenoid valve Connector Terminal Resistance (Approx.)
Torque converter clutch
solenoid valveF30 5 - Ground 5 - 20 Ω
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