2008 NISSAN LATIO Service Repair Manual

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NISSAN LATIO 2008 Service Repair Manual DTC P0725 ENGINE SPEED SIGNAL
AT-101
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DTC P0725 ENGINE SPEED SIGNAL
DescriptionINFOID:0000000001703224
The engine speed signal is sent from the E

DTC P0725 ENGINE SPEED SIGNAL
AT-101
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DTC P0725 ENGINE SPEED SIGNAL
DescriptionINFOID:0000000001703224
The engine speed signal is sent from the ECM to the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703225
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703226
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0725 ENGINE SPEED SIG” with CONSULT-III or 9th judgement flicker without
CONSULT-III is detected when TCM does not receive the proper voltage signal from ECM.
Possible CauseINFOID:0000000001703227
Harness or connector
(Circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001703228
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 and maintain the following conditions for at least 10 consecutive seconds.
VEHICLE SPEED: 10 km/h (6 MPH) or more
THROTTLE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
4. If the check result is NG, go to AT-103, "
Diagnosis Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle under the following conditions for more than 10 seconds.
Selector lever position: “D” position
Vehicle speed: Higher than 10 km/h (6 MPH)
Throttle position: Greater than 1.0/8 of the full throttle position
3. Perform self-diagnosis. Refer to AT-78, "
Diagnosis Procedure without CONSULT-III" .
4. If the check result is NG, go to AT-103, "
Diagnosis Procedure" .
Item name Condition Display value
ENGINE SPEED Engine running Approximately matches the tachometer reading.

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NISSAN LATIO 2008 Service Repair Manual AT-102
< SERVICE INFORMATION >
DTC P0725 ENGINE SPEED SIGNAL
Wiring Diagram - AT - ENGSS
INFOID:0000000001703229
TCM TERMINALS AND REFERENCE VALUES
Refer to AT-71, "TCM Terminal and Reference Valu

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NISSAN LATIO 2008 Service Repair Manual DTC P0725 ENGINE SPEED SIGNAL
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Diagnosis ProcedureINFOID:0000000001703230
1.CHECK DTC WITH ECM
Check DTC with CONSULT-III “ENGINE”.
Tu

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NISSAN LATIO 2008 Service Repair Manual AT-104
< SERVICE INFORMATION >
DTC P0725 ENGINE SPEED SIGNAL
Perform AT-101, "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 5.
5.CHECK TCM
1. Check TCM input/output si

Page 117 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0731 A/T 1ST GEAR FUNCTION
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DTC P0731 A/T 1ST GEAR FUNCTION
DescriptionINFOID:0000000001703231
• This malfunction will not be detec

DTC P0731 A/T 1ST GEAR FUNCTION
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DTC P0731 A/T 1ST GEAR FUNCTION
DescriptionINFOID:0000000001703231
• 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 first gear position 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, etc.
On Board Diagnosis LogicINFOID:0000000001703232
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0731 A/T 1ST GR FNCTN” with CONSULT-III is detected when A/T cannot be
shifted to the 1st gear position 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 higher than the position (1st) supposed by TCM, the slip ratio will be more than
normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when either shift solenoid valve A is stuck open or shift solenoid valve B is
stuck open.
• 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 A stuck open: 2*, 2, 3 and 3 positions
In case of gear position with shift solenoid valve B stuck open: 4*, 3, 3 and 4 positions to each gear position
above
*: “P0731 A/T 1ST GR FNCTN” is detected.
Possible CauseINFOID:0000000001703233
• Shift solenoid valve A
• Shift solenoid valve B
• Each clutch
• Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001703234
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 the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the
voltage (cool down the fluid).
4. Select “1ST GR FNCTN P0731” of “DTC WORK SUPPORT” mode for “A/T” with CONSULT-III and touch
“START”.
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)

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NISSAN LATIO 2008 Service Repair Manual AT-106
< SERVICE INFORMATION >
DTC P0731 A/T 1ST GEAR FUNCTION
5. Accelerate vehicle to 20 to 25 km/h (12 to 16 MPH) under the following conditions and release the accel-
erator pedal completely.
THRO

AT-106
< SERVICE INFORMATION >
DTC P0731 A/T 1ST GEAR FUNCTION
5. Accelerate vehicle to 20 to 25 km/h (12 to 16 MPH) under the following conditions and release the accel-
erator pedal completely.
THROTTLE POSI: Less than 1.0/8 (at all times during step 4)
SLCT LVR POSI: “D” position
-Make sure that “GEAR” shows “2” after releasing pedal.
6. Depress accelerator pedal to WOT (more than 7.0/8 of “THROTTLE POSI”) quickly from a speed of 20 to
25 km/h (12 to 16 MPH) until “TESTING” changes to “STOP VEHICLE” or “COMPLETED”. (It will take
approximately 3 seconds.)
If the check result NG appears on CONSULT-III screen, go to AT-106, "
Diagnosis Procedure".
If “STOP VEHICLE” appears on CONSULT-III screen, go to the following step.
-Make sure that “GEAR” shows “1” when depressing accelerator pedal to WOT.
-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 “P0731 A/T 1ST 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-106, "
Diagnosis Procedure".
Refer to AT-61, "
Vehicle Speed at Which Gear Shifting Occurs".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001703235
1.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 2.
NG >> Repair or replace damaged parts.
2.CHECK VALVE OPERATION
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 1ST GR FNCTN ” exists.2 → 2 → 3 → 3
4 → 3 → 3 → 4
Solenoid valve Connector Terminal Resistance (Approx.)
Shift solenoid valve A
F302 - Ground 20 - 30 Ω
Shift solenoid valve B 1 - Ground 5 - 20 Ω
SCIA3594E

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NISSAN LATIO 2008 Service Repair Manual DTC P0731 A/T 1ST GEAR FUNCTION
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1. Remove control valve assembly. Refer to AT-216, "Control Valve Assembly and Accumulators".
- S

Page 120 of 2771

NISSAN LATIO 2008 Service Repair Manual AT-108
< SERVICE INFORMATION >
DTC P0732 A/T 2ND GEAR FUNCTION
DTC P0732 A/T 2ND GEAR FUNCTION
DescriptionINFOID:0000000001703236
• This malfunction will not be detected while the OD OFF indicator l

AT-108
< SERVICE INFORMATION >
DTC P0732 A/T 2ND GEAR FUNCTION
DTC P0732 A/T 2ND GEAR FUNCTION
DescriptionINFOID:0000000001703236
• 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 second gear position 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, etc.
On Board Diagnosis LogicINFOID:0000000001703237
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0732 A/T 2ND GR FNCTN” with CONSULT-III is detected when A/T cannot be
shifted to the 2nd gear position 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 higher than the position (2nd) supposed by TCM, the slip ratio will be more than
normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck open.
• 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 open: 4, 3*, 3 and 4 positions to each gear position
above
*: “P0732 A/T 2ND GR FNCTN” is detected.
Possible CauseINFOID:0000000001703238
• Shift solenoid valve B
• Each clutch
• Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000001703239
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 the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the
voltage (cool down the fluid).
4. Select “2ND GR FNCTN P0732” of “DTC WORK SUPPORT” mode for “A/T” with CONSULT-III and touch
“START”.
5. Accelerate vehicle to 45 to 50 km/h (28 to 31 MPH) under the following conditions and release the accel-
erator pedal completely.
THROTTLE POSI: Less than 1.0/8
SLCT LVR POSI: “D” position
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)

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