2008 NISSAN LATIO engine

AT-124
< SERVICE INFORMATION >
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DescriptionINFOID:0000000001703260
• This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis
malfunction.
• This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter
clutch does not lock-up as instructed by the TCM. This is not caused by electrical malfunction (circuits open
or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation,
malfunctioning oil pump or torque converter clutch, etc.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703261
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703262
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-III is detected when A/T cannot per-
form lock-up even if electrical circuit is good.
• This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the position (4th) supposed by TCM, the slip ratio will be much
less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis malfunc-
tion.
This malfunction will be caused when shift solenoid valve B is stuck closed.
• Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1, 2, 3 and 4 positions
In case of gear position with shift solenoid valve B stuck closed: 1, 2, 2 and 1* positions to each gear position
above
*: “P0744 A/T TCC S/V FNCTN” is detected.
Possible CauseINFOID:0000000001703263
• Line pressure solenoid valve
• Torque converter clutch solenoid valve
• Each clutch
• Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001703264
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. 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 vehicle to decrease voltage (warm up the fluid) or stop engine to increase voltage
(cool down the fluid).
4. Select “TCC S/V FNCTN P0744” of “DTC WORK SUPPORT” mode for “A/T” with CONSULT-III and touch
“START”.
Item name Condition Display value (Approx)
TCC S/V DUTY Lock-up OFF ⇔ Lock-up ON 4% ⇔ 94%

DTC P0745 LINE PRESSURE SOLENOID VALVE
AT-129
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
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MA
B
AT
N
O
P
DTC P0745 LINE PRESSURE SOLENOID VALVE
DescriptionINFOID:0000000001703266
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to signals sent from the TCM.
The line pressure duty cycle value is not constant when the closed throttle position switch is ON. To
confirm the line pressure duty cycle at low-pressure, the accelerator (throttle) should be open until the
closed throttle position switch is OFF.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703267
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703268
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745 LINE PRESSURE S/V” with CONSULT-III or 11th judgement flicker without
CONSULT-III is detected when TCM detects an improper voltage drop while it tries to operate the solenoid
valve.
Possible CauseINFOID:0000000001703269
• Harness or connector
(The solenoid circuit is open or shorted.)
• Line pressure solenoid valve
DTC Confirmation ProcedureINFOID:0000000001703270
CAUTION:
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 and select “DATA MONITOR” mode for “A/T” with CONSULT-III.
2. Touch “START”.
3. Depress accelerator pedal completely and wait at least 1 second.
4. If the check result is NG, go to AT-131, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
WITHOUT CONSULT-III
1. Start engine.
2. With brake pedal depressed, shift the lever from “P”→“N”→“D”→“N”→“P” positions.
3. Perform self-diagnosis. Refer to AT-78, "
Diagnosis Procedure without CONSULT-III" .
4. If the check result is NG, go to AT-131, "
Diagnosis Procedure" .
Item name Condition Display value (Approx.)
LINE PRES DTYSmall throttle opening (Low line pressure) ⇔ Large
throttle opening (High line pressure)0% ⇔ 94%

DTC P0745 LINE PRESSURE SOLENOID VALVE
AT-131
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
Diagnosis ProcedureINFOID:0000000001703272
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-III.
3. Read out the value of “LINE PRES DTY” while driving. Check the value changes according to driving
speed.
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK DROPPING RESISTOR
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector in engine room.
3. Check resistance between terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly connector in engine room.
Item name Condition Display value
LINE PRES DTYSmall throttle opening (Low line pressure)
⇔ Large throttle opening (High line pres-
sure)0 % ⇔ 94 %
ItemConnec-
torTerminal ConditionJudge-
ment stan-
dard
(Approx.)
Line pres-
sure sole-
noid valveE31 1 - GroundWhen releasing accelera-
tor pedal after warming
up engine.1.5 - 3.0 V
When depressing accel-
erator pedal fully after
warming up engine.0 V
Line pres-
sure sole-
noid valve
(with drop-
ping resis-
tor)E31 2 - GroundWhen releasing accelera-
tor pedal after warming
up engine.4 - 14 V
When depressing accel-
erator pedal fully after
warming up engine.0 V
SCIA3267E
Item Connector Terminal Resistance (Approx.)
Dropping resistor E49 1 - 2 12 Ω
SCIA4950E

AT-134
< SERVICE INFORMATION >
DTC P0750 SHIFT SOLENOID VALVE A
DTC P0750 SHIFT SOLENOID VALVE A
DescriptionINFOID:0000000001703274
Shift solenoid valves A and B are turned ON or OFF by the TCM in response to signals sent from the PNP
switch, vehicle speed and ECM (throttle opening). Gears will then be shifted to the optimum position.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703275
On Board Diagnosis LogicINFOID:0000000001703276
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0750 SHIFT SOLENOID/V A” with CONSULT-III or 4th judgement flicker without
CONSULT-III is detected when TCM detects an improper voltage drop when it tries to operate the solenoid
valve.
Possible CauseINFOID:0000000001703277
• Harness or connector
(The solenoid circuit is open or shorted.)
• Shift solenoid valve A
DTC Confirmation ProcedureINFOID:0000000001703278
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 and select “DATA MONITOR” mode for “A/T” with CONSULT-III.
2. Touch “START”.
3. Start engine.
4. Drive vehicle in “D” position and allow the transaxle to shift 1 → 2 (“GEAR”).
5. If the check result is NG, go to AT-136, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle in D
1→ D2 position.
3. Perform self-diagnosis. Refer to AT-78, "
Diagnosis Procedure without CONSULT-III" .
4. If the check result is NG, go to AT-136, "
Diagnosis Procedure" .
Gear position1234
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)
Item name Condition Display value
SHIFT S/V AWhen shift solenoid valve A operates.
(When driving in “D
1 ” or “D4 ”.)ON
When shift solenoid valve A does not operate.
(When driving in “D
2 ” or “D3 ”.)OFF

AT-136
< SERVICE INFORMATION >
DTC P0750 SHIFT SOLENOID VALVE A
Diagnosis Procedure
INFOID:0000000001703280
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 “SHIFT S/V A” 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 SHIFT SOLENOID VALVE A 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.
Item name Condition Display value
SHIFT S/V AWhen shift solenoid valve A operates.
(When driving in “D
1” or “D4”.)ON
When shift solenoid valve A does not oper-
ate.
(When driving in “D
2” or “D3”.)OFF
ItemConnec-
torTerminal ConditionJudge-
ment stan-
dard
(Approx.)
Shift sole-
noid valve AE31 11 - GroundWhen shift solenoid valve
A operates.
(When driving in “D
1” or
“D
4”.)Battery
voltage
When shift solenoid valve
A does not operate.
(When driving in “D
2” or
“D
3”.)0 V
SCIA3248E
Solenoid Valve Connector Terminal Resistance (Approx.)
Shift solenoid valve A E31 11 - Ground 20 - 30 Ω
SCIA3249E

DTC P0750 SHIFT SOLENOID VALVE A
AT-137
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
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-134, "
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:0000000001703281
SHIFT SOLENOID VALVE A
• For removal, refer to AT-216, "Control Valve Assembly and Accumulators" .
Resistance Check
Item Connector Terminal Continuity
TCM E31 11
Ye s
Terminal cord assembly
harness connectorF30 2
SCIA3250E
Solenoid valve Connector Terminal Resistance (Approx.)
Shift solenoid valve A F30 2 - Ground 20 - 30 Ω
SCIA3453E

DTC P0755 SHIFT SOLENOID VALVE B
AT-139
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
DTC P0755 SHIFT SOLENOID VALVE B
DescriptionINFOID:0000000001703282
Shift solenoid valves A and B are turned ON or OFF by the TCM in response to signals sent from the PNP
switch, vehicle speed and ECM (throttle opening). Gears will then be shifted to the optimum position.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703283
On Board Diagnosis LogicINFOID:0000000001703284
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0755 SHIFT SOLENOID/V B” with CONSULT-III or 5th judgement flicker without
CONSULT-III is detected when TCM detects an improper voltage drop when it tries to operate the solenoid
valve.
Possible CauseINFOID:0000000001703285
• Harness or connector
(The solenoid circuit is open or shorted.)
• Shift solenoid valve B
DTC Confirmation ProcedureINFOID:0000000001703286
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 and select “DATA MONITOR” mode for “A/T” with CONSULT-III.
2. Touch “START”.
3. Start engine.
4. Drive vehicle in D position and allow the transaxle to shift 1 → 2 → 3 (“GEAR”).
5. If the check result is NG, go to AT-141, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle in D
1→ D2→ D3 position.
3. Perform self-diagnosis. Refer to AT-78, "
Diagnosis Procedure without CONSULT-III" .
4. If the check result is NG, go to AT-141, "
Diagnosis Procedure" .
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)
Item name Condition Display value
SHIFT S/V BWhen shift solenoid valve B operates.
(When driving in “D
1 ” or “D2 ”.)ON
When shift solenoid valve B does not operate.
(When driving in “D
3 ” or “D4 ”.)OFF

DTC P0755 SHIFT SOLENOID VALVE B
AT-141
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
Diagnosis ProcedureINFOID:0000000001703288
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 “SHIFT S/V B” 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 SHIFT SOLENOID VALVE B 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.
Item name Condition Display value
SHIFT S/V BWhen shift solenoid valve B operates.
(When driving in “D
1” or “D2”.)ON
When shift solenoid valve B does not operate.
(When driving in “D
3” or “D4”.)OFF
ItemConnec-
torTerminal ConditionJudge-
ment stan-
dard
(Approx.)
Shift sole-
noid valve BE3112 -
GroundWhen shift solenoid valve
B operates.
(When driving in “D
1” or
“D
2”.)Battery
voltage
When shift solenoid valve
B does not operate.
(When driving in “D
3” or
“D
4”.)0 V
SCIA3253E
Solenoid Valve Connector Terminal Resistance (Approx.)
Shift solenoid valve B E31 12 - Ground 5 - 20 Ω
SCIA3254E