engine control NISSAN TIIDA 2007 Service Owners Manual

CVT SYSTEM
CVT-27
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
NOTE:
The gear ratio is set for every position separately.
“D” POSITION
Shifting over all the ranges of gear ratios from the lowest to the high-
est.
OVERDRIVE-OFF MODE
Use this position for the improved engine braking.
“L” POSITION
By limiting the gear range to the lowest position, the strong driving
force and the engine brake can be secured.
DOWNHILL ENGINE BRAKE CONTROL (AUTO ENGINE BRAKE CONTROL)
When downhill is detected with the accelerator pedal released, the engine brake will be strengthened up by
downshifting so as not to accelerate the vehicle more than necessary.
ACCELERATION CONTROL
According to vehicle speed and a change of accelerator pedal angle, driver's request for acceleration and driv-
ing scene are judged. This function assists improvement in acceleration feeling by making the engine speed
proportionate to the vehicle speed. And a shift map which can gain a larger driving force is available for com-
patibility of mileage with driveability.
SCIA1953E
SCIA1955E

CVT-28
CVT SYSTEM
Revision: June 20062007 Versa
Lock-up and Select ControlUCS005XY

The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.

The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid
valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or
releases the torque converter clutch piston.

When shifting between “N” (“P”) ⇔ “D” (“R”), torque converter clutch solenoid controls engagement power
of forward clutch and reverse brake.

The lock-up applied gear range was expanded by locking up the
torque converter at a lower vehicle speed than conventional
CVT models.
TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL
Lock-up and Select Control System Diagram
Lock-up Released
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque
converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
Select Control
When shifting between “N” (“P”)⇔“D” (“R”), optimize the operating pressure on the basis of the throttle posi-
tion, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.
SCIA1958E
SCIA2374E

CVT-34
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartUCS005Y5
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer to CVT-68
.
Fail-safeUCS005Y6
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit.
FAIL -S AFE F UN CTI ON
If any malfunction occurs in a sensor or solenoid, this function controls the CVT to make driving possible.
Output Speed Sensor (Secondary Speed Sensor)
The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from the
output speed sensor (secondary speed sensor) to the TCM. The overdrive-off mode is inhibited, and the tran-
saxle is put in “D”.
Input Speed Sensor (Primary Speed Sensor)
The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed) when
an unexpected signal is sent from the input speed sensor (primary speed sensor) to the TCM. The sport mode
is inhibited, and the transaxle is put in “D”.
PNP Switch
If an unexpected signal is sent from the PNP switch to the TCM, the transaxle is put in “D”.
CVT Fluid Temperature Sensor
If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use before
receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed under 3500
rpm.
Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)

If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor)
to the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the
non-standard condition occurs is used to control line pressure.

If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, second-
ary pressure feedback control stops, but line pressure is controlled normally.
Pressure Control Solenoid A (Line Pressure Solenoid)
If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid A (line pressure
solenoid) is turned OFF to achieve the maximum fluid pressure.
Pressure Control Solenoid B (Secondary Pressure Solenoid)
If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid B (secondary pres-
sure solenoid) is turned OFF to achieve the maximum fluid pressure.
Torque Converter Clutch Solenoid
If an unexpected signal is sent from the solenoid to the TCM, the torque converter clutch solenoid is turned
OFF to cancel the lock-up.
Step Motor
If an unexpected signal is sent from the step motor to the TCM, the step motor coil phases “A” through “D” are
all turned OFF to hold the gear ratio used right before the non-standard condition occurred.
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

TROUBLE DIAGNOSIS
CVT-35
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
CVT Lock-up Select Solenoid
If an unexpected signal is sent from the solenoid to the TCM, the CVT lock-up select solenoid is turned OFF to
cancel the lock-up.
TCM Power Supply (Memory Back-up)
Transaxle assembly is protected by limiting the engine torque when the memory back-up power supply (for
controlling) from the battery is not supplied to TCM. Normal statues is restored when turning the ignition switch
OFF to ON after the normal power supply.
How to Perform Trouble Diagnosis for Quick and Accurate RepairUCS005Y7
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, PNP switch and provides shift control or lock-up
control via CVT solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
CVT system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the CVT system. The CVT system must be in good
operating condition and be free of valve seizure, solenoid valve mal-
function, etc.
It is much more difficult to diagnose an error that occurs intermit-
tently rather than continuously. Most intermittent errors are caused
by poor electric connections or improper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of
good parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the CVT-36, "
WORK FLOW" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “DIAGNOSTIC WORKSHEET” as
shown on the example (Refer to CVT-37
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT6 3 1IB
SAT6 3 2I
SEF 2 34 G

CVT-38
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
4❏ Perform road test.CVT-46
4-1.Check before engine is started CVT-49
❏ CVT-180, "O/D OFF Indicator Lamp Does Not Come On"
❏ Perform self-diagnosis. Enter checks for detected items. CVT-60
❏ CVT-68, "DTC U1000 CAN COMMUNICATION LINE"
❏ CVT-72, "DTC P0615 START SIGNAL CIRCUIT"
❏ CVT-76, "DTC P0703 STOP LAMP SWITCH CIRCUIT"
❏ CVT-78, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ CVT-85, "DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT"
❏ CVT-90, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)"
❏ CVT-95, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED
SENSOR)"
❏ CVT-101, "DTC P0725 ENGINE SPEED SIGNAL"
❏ CVT-103, "DTC P0730 BELT DAMAGE"
❏ CVT-105, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ CVT-110, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ CVT-113, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ CVT-118, "DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE
(LINE PRESSURE SOLENOID VALVE)"
❏ CVT-121, "DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE
(SEC PRESSURE SOLENOID VALVE)"
❏ CVT-124, "DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC
PRESSURE SOLENOID VALVE)"
❏ CVT-129, "DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT
(SEC PRESSURE SENSOR)"
❏ CVT-134, "DTC P0841 PRESSURE SENSOR FUNCTION"
❏ CVT-137, "DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT
(PRI PRESSURE SENSOR)"
❏ CVT-142, "DTC P0868 SECONDARY PRESSURE DOWN"
❏ CVT-145, "DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)"
❏ CVT-150, "DTC P1705 THROTTLE POSITION SENSOR"
❏ CVT-152, "DTC P1722 ESTM VEHICLE SPEED SIGNAL"
❏ CVT-154, "DTC P1723 CVT SPEED SENSOR FUNCTION"
❏ CVT-156, "DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM"
❏ CVT-158, "DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT"
❏ CVT-164, "DTC P1777 STEP MOTOR - CIRCUIT"
❏ CVT-168, "DTC P1778 STEP MOTOR - FUNCTION"
4-2.Check at idleCVT-49
❏ CVT-181, "Engine Cannot Be Started in “P” and “N” Position"
❏ CVT-182, "In “P” Position, Vehicle Moves Forward or Backward When Pushed"
❏ CVT-182, "In “N” Position, Vehicle Moves"
❏ CVT-183, "Large Shock “N” → “R” Position"
❏ CVT-184, "Vehicle Does Not Creep Backward in “R” Position"
❏ CVT-185, "Vehicle Does Not Creep Forward in “D” or “L” Position"

TROUBLE DIAGNOSIS
CVT-39
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
44-3.Cruise testCVT-50
❏ CVT-186, "Vehicle Speed Does Not Change in “L” Position"
❏ CVT-187, "Vehicle Speed Does Not Change in overdrive-off mode"
❏ CVT-188, "Vehicle Speed Does Not Change in “D” Position"
❏ CVT-189, "Vehicle Does Not Decelerate by Engine Brake"
❏ perform self-diagnosis. Enter checks for detected items. CVT-60
❏ CVT-68, "DTC U1000 CAN COMMUNICATION LINE"
❏ CVT-72, "DTC P0615 START SIGNAL CIRCUIT"
❏ CVT-76, "DTC P0703 STOP LAMP SWITCH CIRCUIT"
❏ CVT-78, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ CVT-85, "DTC P0710 CVT FLUID TEMPERATURE SENSOR CIRCUIT"
❏ CVT-90, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)"
❏ CVT-95, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED
SENSOR)"
❏ CVT-101, "DTC P0725 ENGINE SPEED SIGNAL"
❏ CVT-103, "DTC P0730 BELT DAMAGE"
❏ CVT-105, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ CVT-110, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ CVT-113, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ CVT-118, "DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE
(LINE PRESSURE SOLENOID VALVE)"
❏ CVT-121, "DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE
(SEC PRESSURE SOLENOID VALVE)"
❏ CVT-124, "DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC
PRESSURE SOLENOID VALVE)"
❏ CVT-129, "DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT
(SEC PRESSURE SENSOR)"
❏ CVT-134, "DTC P0841 PRESSURE SENSOR FUNCTION"
❏ CVT-137, "DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT
(PRI PRESSURE SENSOR)"
❏ CVT-142, "DTC P0868 SECONDARY PRESSURE DOWN"
❏ CVT-145, "DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)"
❏ CVT-150, "DTC P1705 THROTTLE POSITION SENSOR"
❏ CVT-152, "DTC P1722 ESTM VEHICLE SPEED SIGNAL"
❏ CVT-154, "DTC P1723 CVT SPEED SENSOR FUNCTION"
❏ CVT-156, "DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM"
❏ CVT-158, "DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT"
❏ CVT-164, "DTC P1777 STEP MOTOR - CIRCUIT"
❏ CVT-168, "DTC P1778 STEP MOTOR - FUNCTION"
5❏ Inspect each system for items found to be NG in the self-diagnosis and repair or replace the malfunctioning parts.
6❏ Perform all road tests and enter the checks again for the required items.CVT-46
7❏ For any remaining NG items, perform the “diagnosis procedure” and repair or replace the malfunctioning parts.
8❏ Erase the results of the self-diagnosis from the TCM.CVT-32
,
CVT-32

CVT-46
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Line Pressure
*: Reference values
Judgement of Line Pressure Test
Road TestUCS005YC
DESCRIPTION

The purpose of the test is to determine overall performance of
CVT and analyze causes of problems.

The road test consists of the following three parts:
1. “Check Before Engine Is Started” CVT-49
.
2. “Check at Idle” CVT-49
.
3. “Cruise Test” CVT-50
.
Engine speed Line pressure kPa (kg/cm
2 , psi)
“R”, “D” and “L” positions
At idle 650 (6.63, 94.3)
At stall 4,250 (43.35, 616.3)*
Judgement Possible cause
Idle speedLow for all positions
(“P”, “R”, “N”, “D”, “L”)Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example

Oil pump wear

Pressure regulator valve or plug sticking or spring fatigue

Oil strainer
oil pump
pressure regulator valve passage oil leak

Engine idle speed too low
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
HighPossible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example

Accelerator pedal position signal malfunction

CVT fluid temperature sensor malfunction

Pressure control solenoid A (line pressure solenoid) malfunction (sticking in OFF state, filter
clog, cut line)

Pressure regulator valve or plug sticking
Stall speedLine pressure does
not rise higher than
the line pressure for
idle.Possible causes include a sensor malfunction or malfunction in the pressure adjustment func-
tion.
For example

Accelerator pedal position signal malfunction

TCM malfunction

Pressure control solenoid A (line pressure solenoid) malfunction (shorting, sticking in ON
state)

Pressure regulator valve or plug sticking
The pressure rises,
but does not enter the
standard position.Possible causes include malfunctions in the pressure supply system and malfunction in the
pressure adjustment function.
For example

Accelerator pedal position signal malfunction

Pressure control solenoid A (line pressure solenoid) malfunction (sticking, filter clog)

Pressure regulator valve or plug sticking
Only low for a specific
positionPossible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
SAT7 8 6A

TROUBLE DIAGNOSIS
CVT-51
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
2. CHECK VEHICLE SPEED WHEN SHIFTING GEARS — PART 2
1. Park vehicle on flat surface.
2. Move selector lever to “D” position.
3. Push overdrive control switch. (O/D OFF indicator lamp is on.)
4. Accelerate vehicle to 2/8-way throttle depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-53,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK >> GO TO 3.
NG >> Mark the box of CVT-187, "
Vehicle Speed Does Not
Change in overdrive-off mode" on the CVT-37, "DIAG-
NOSTIC WORKSHEET" . Continue “Road Test”.
3. CHECK VEHICLE SPEED WHEN SHIFTING GEARS — PART 3
1. Park vehicle on flat surface.
2. Move selector lever to “D” position.
3. Push overdrive control switch. (O/D OFF indicator lamp is off.)
4. Accelerate vehicle to 2/8-way throttle depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-53,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK >> GO TO 4.
NG >> Mark the box of CVT-188, "
Vehicle Speed Does Not
Change in “D” Position" on the CVT-37, "DIAGNOSTIC
WORKSHEET" . Continue “Road Test”.
4. CHECK VEHICLE SPEED WHEN SHIFTING GEARS — PART 4
1. Park vehicle on flat surface.
2. Move selector lever to “L” position.
3. Accelerate vehicle to full depression depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-53,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK >> GO TO 5.
NG >> Mark the box of CVT-186, "
Vehicle Speed Does Not
Change in “L” Position" on the CVT-37, "DIAGNOSTIC
WORKSHEET" . Continue “Road Test”.
SCIA6644E
SCIA6644E
SCIA4366E

CVT-52
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
5. CHECK VEHICLE SPEED WHEN SHIFTING GEARS — PART 5
1. Park vehicle on flat surface.
2. Move selector lever to “D” position.
3. Push overdrive control switch. (O/D OFF indicator lamp is on.)
4. Accelerate vehicle to full depressing depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-53,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK >> GO TO 6.
NG >> Mark the box of CVT-187, "
Vehicle Speed Does Not
Change in overdrive-off mode" on the CVT-37, "DIAG-
NOSTIC WORKSHEET" . Continue “Road Test”.
6. CHECK VEHICLE SPEED WHEN SHIFTING GEARS — PART 6
1. Park vehicle on flat surface.
2. Move selector lever to “D” position.
3. Push overdrive control switch. (O/D OFF indicator lamp is off.)
4. Accelerate vehicle to full depression depressing accelerator
pedal constantly.
Read vehicle speed and engine speed. Refer to CVT-53,
"Vehicle Speed When Shifting Gears" .
OK or NG
OK >> GO TO 7.
NG >> Mark the box of CVT-188, "
Vehicle Speed Does Not
Change in “D” Position" on the CVT-37, "DIAGNOSTIC
WORKSHEET" . Continue “Road Test”.
7. CHECK ENGINE BRAKE FUNCTION — PART 1
1. Release accelerator pedal.
2. Check engine brake. (O/D OFF indicator lamp is off.)
Does engine braking effectively reduce speed in
“D” position?
YES >> GO TO 8.
NO >> Mark the box of CVT-189, "
Vehicle Does Not Decelerate by Engine Brake" on the CVT-37,
"DIAGNOSTIC WORKSHEET" . Continue “Road Test”.
8. CHECK ENGINE BRAKE FUNCTION — PART 2
1. Push overdrive control switch. (O/D OFF indicator lamp is on.)
2. Check engine brake.
Does engine braking effectively reduce speed in
“D” position?
YES >> GO TO 9.
NO >> Mark the box of CVT-189, "
Vehicle Does Not Decelerate by Engine Brake" on the CVT-37,
"DIAGNOSTIC WORKSHEET" . Continue “Road Test”.
SCIA4366E
SCIA4366E

TROUBLE DIAGNOSIS
CVT-59
D
E
F
G
H
I
J
K
L
MA
B
CVT
Revision: June 20062007 Versa
*: Models without ABS does not indicate.
CONSULT-II SETTING PROCEDURE
Refer to GI-38, "CONSULT-II Start Procedure" .
WORK SUPPORT MODE
Display Item List
Engine Brake Adjustment
1. Touch “WORK SUPPORT” on “SELECT DIAG MODE” screen.
2. Touch “ENGINE BRAKE ADJ”.
3. Touch “START”.
4. Set “ENGINE BRAKE LEVEL” by touching “UP” or “DOWN”.
5. Turn ignition switch OFF, wait at least 5 seconds and then turn
ignition switch ON.
6. Engine brake level set is completed.
Item name Description
ENGINE BRAKE ADJ. The engine brake level setting can be canceled.
CONFORM CVTF DETERIORTN The CVT fluid deterioration level can be checked.
BCIA0031E
SCIA4287E
SCIA4288E
“ENGINE BRAKE LEVEL”
0: Initial set value (Engine brake level control is
activated)
OFF: Engine brake level control is deactivated.
SAT9 3 4J