2008 NISSAN TIIDA Engine Control System

CVT-100
< SERVICE INFORMATION >
DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-
SURE SOLENOID VALVE)
DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE
PRESSURE SOLENOID VALVE)
DescriptionINFOID:0000000001703553
• The pressure control solenoid valve A (line pressure solenoid valve) is included in the control valve assem-
bly.
• The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703554
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703555
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0746 PRS CNT SOL/A FCTN” with CONSULT-III is detected under the following
conditions.
- Unexpected gear ratio was detected in the LOW side due to excessively low line pressure.
Possible CauseINFOID:0000000001703556
• Line pressure control system
• Output speed sensor (Secondary speed sensor)
• Input speed sensor (Primary speed sensor)
DTC Confirmation ProcedureINFOID:0000000001703557
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, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 10 consecutive seconds. Test start from 0
km/h (0 MPH).
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-100, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001703558
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “PRI PRESS”.
Item name Condition Display value (Approx.)
PRI PRESS “N” position idle 0.4 MPa

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-
SURE SOLENOID VALVE)
CVT-101
< SERVICE INFORMATION >
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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 LINE PRESSURE
Perform line pressure test. Refer to CVT-36, "
Inspections before Trouble Diagnosis".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-36, "
Inspections before Trouble Diagnosis".
3.DETECT MALFUNCTIONING ITEM
Check pressure control solenoid valve A (line pressure solenoid valve). Refer to CVT-98, "
Component Inspec-
tion".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-80
, CVT-76.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
Check the following:
• Power supply and ground circuit for TCM. Refer to CVT-122, "
Wiring Diagram - CVT - POWER".
• The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK DTC
Perform CVT-100, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> Replace the transaxle assembly or TCM. Refer to CVT-178, "
Removal and Installation".
Item name Condition Display value (Approx.)
PRI PRESS “N” position idle 0.4 MPa
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission
fluid pressure
sensor B (Pri-
mary pressure
sensor)E32 41 - Ground “N” position idle 0.7 V
SCIA1922E

CVT-102
< SERVICE INFORMATION >
DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRES-
SURE SOLENOID VALVE)
DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC
PRESSURE SOLENOID VALVE)
DescriptionINFOID:0000000001703559
• The pressure control solenoid valve B (secondary pressure solenoid valve) is included in the control valve
assembly.
• The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pres-
sure to suit the driving condition in response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703560
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703561
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0776 PRS CNT SOL/B FCTN” with CONSULT-III is detected when secondary
pressure is too high or too low compared with the commanded value while driving.
Possible CauseINFOID:0000000001703562
• Harness or connectors
(Solenoid circuit is open or shorted.)
• Pressure control solenoid valve B (Secondary pressure solenoid valve system)
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Line pressure control system
DTC Confirmation ProcedureINFOID:0000000001703563
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 procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 30 consecutive seconds.
ATF TEMP SEN: 1.0 - 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-102, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001703564
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC PRESS”.
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa

CVT-114
< SERVICE INFORMATION >
DTC P0841 PRESSURE SENSOR FUNCTION
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 3.
3.CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-36, "
Inspections before Trouble Diagnosis".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to CVT-36, "
Inspections before Trouble Diagnosis".
4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system and transmission fluid pres-
sure sensor B (primary pressure sensor) system. Refer to CVT-109
, CVT-115.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
Check the following:
• Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-98, "
Component Inspection".
• Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-107, "
Component
Inspection".
• Step motor. Refer to CVT-140, "
Component Inspection".
OK or NG6
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK DTC
Perform CVT-113, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-178, "
Removal and Installation".
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 V
SEC HYDR SEN 1.0 V
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission fluid
pressure sensor B
(Primary pres-
sure sensor)
E3241 - Ground
“N” position idle0.7 V
Transmission fluid
pressure sensor A
(Secondary pres-
sure sensor)37 - Ground 1.0 V
SCIA6879E

DTC P0868 SECONDARY PRESSURE DOWN
CVT-119
< SERVICE INFORMATION >
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DTC P0868 SECONDARY PRESSURE DOWN
DescriptionINFOID:0000000001703593
• The pressure control solenoid valve B (secondary pressure solenoid valve) is included in the control valve
assembly.
• The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pres-
sure to suit the driving condition in response to a signal sent from the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703594
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703595
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0868 SEC/PRESS DOWN” with CONSULT-III is detected when secondary fluid
pressure is too low compared with the commanded value while driving.
Possible CauseINFOID:0000000001703596
• Harness or connectors
(Solenoid circuit is open or shorted.)
• Pressure control solenoid valve B (Secondary pressure solenoid valve) system
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Line pressure control system
DTC Confirmation ProcedureINFOID:0000000001703597
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 procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 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)
3. Start engine and maintain the following conditions for at least 10 consecutive seconds.
VEHICLE SPEED (accelerate slowly): 0 → 50 km/h (31 MPH)
ACC PEDAL OPEN: 0.5/8 - 1.0/8
RANGE: “D” position
4. If DTC is detected, go to CVT-119, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001703598
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC PRESS”.
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.8 MPa

DTC P1723 CVT SPEED SENSOR FUNCTION
CVT-129
< SERVICE INFORMATION >
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DTC P1723 CVT SPEED SENSOR FUNCTION
DescriptionINFOID:0000000001703617
• The input speed sensor (primary speed sensor) is included in the control valve assembly.
• The vehicle speed sensor CVT [output speed sensor (secondary speed sensor)] detects the revolution of the
idler gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle
speed.
• The input speed sensor (primary speed sensor) detects the primary pulley revolution speed and sends a sig-
nal to the TCM.
On Board Diagnosis LogicINFOID:0000000001703618
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1723 CVT SPD SEN/FNCTN” with CONSULT-III is detected when there is a great
difference between the vehicle speed signal and the secondary speed sensor signal.
CAUTION:
One of the “P0720 VEH SPD SEN/CIR AT”, the “P0715 INPUT SPD SEN/CIRC” or the “P0725 ENGINE
SPEED SIG“ is displayed with the DTC at the same time.
Possible CauseINFOID:0000000001703619
• Harness or connectors
(Sensor circuit is open or shorted.)
• Output speed sensor (Secondary speed sensor)
• Input speed sensor (Primary speed sensor)
• Engine speed signal system
DTC Confirmation ProcedureINFOID:0000000001703620
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, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VEHICLE SPEED SE: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
3. If DTC is detected, go to CVT-129, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001703621
1.CHECK STEP MOTOR FUNCTION
Perform the self-diagnosis check. Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)".
Is a malfunction in the step motor function indicated in the results?
YES >> Repair or replace damaged parts. (Check the step motor function. Refer to CVT-141.)
NO >> GO TO 2.
2.CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR SYSTEM) AND INPUT SPEED
SENSOR (PRIMARY SPEED SENSOR) SYSTEM
Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to CVT-80
, CVT-76.

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM
CVT-131
< SERVICE INFORMATION >
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DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM
DescriptionINFOID:0000000001703622
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM with CAN
communication.
On Board Diagnosis LogicINFOID:0000000001703623
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1726 ELEC TH CONTROL” with CONSULT-III is detected when the electronically
controlled throttle for ECM is malfunctioning.
Possible CauseINFOID:0000000001703624
Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001703625
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, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine and let it idle for 5 second.
4. If DTC is detected, go to CVT-131, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001703626
1.CHECK DTC WITH ECM
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CONSULT-III. Refer to EC-109, "
CONSULT-II
Function (ENGINE)".
OK or NG
OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-109, "
CONSULT-II Function (ENGINE)".
• If CAN communication line is detected, go to CVT-56
.
2.CHECK DTC
Perform CVT-131, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3.DETECT MALFUNCTIONING ITEM
Check the following:
• The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace TCM. Refer to CVT-8, "Service After Replacing TCM and Transaxle Assembly".
NG >> Repair or replace damaged parts.

DTC P1778 STEP MOTOR - FUNCTION
CVT-141
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DTC P1778 STEP MOTOR - FUNCTION
DescriptionINFOID:0000000001703648
• The step motor is included in the control valve assembly.
• The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line
pressure to primary pulley is changed and pulley ratio is controlled.
• This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
• This diagnosis item is detected when the state of the changing the speed mechanism in unit does not oper-
ate normally.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703649
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703650
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1778 STEP MOTR/FNC” with CONSULT-III is detected under the following condi-
tions.
- When not changing the pulley ratio according to the instruction of TCM.
Possible CauseINFOID:0000000001703651
Step motor
DTC Confirmation ProcedureINFOID:0000000001703652
CAUTION:
• Always drive vehicle at a safe speed.
• Before starting “DTC Confirmation Procedure”, confirm “Hi” or “Mid” or “Low” fixation by “PRI
SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.
• If hi-geared fixation occurred, go to CVT-142, "
Diagnosis Procedure".
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, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Make sure that output voltage of CVT fluid temperature sensor is within the range below.
ATF TEMP SEN: 1.0 - 2.0 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)
3. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
4. Start engine and maintain the following conditions for at least 30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
5. If DTC is detected, go to CVT-142, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
STM STEP
During driving−20 step - 180 step
GEAR RATIO2.56 - 0.43