Nissan Murano Z50 (2003 year). Manual — part 63
TROUBLE DIAGNOSIS
CVT-49
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TROUBLE DIAGNOSIS
PFP:00004
DTC Inspection Priority Chart
ACS001SX
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
.
Fail-Safe
ACS001SY
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-SAFE FUNCTION
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 Second position is inhibited, and the
transmission is put in “D” if “S” is selected.
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
Second position is inhibited and the transmission is put in “D” if “S” is selected.
PNP Switch
●
If an unexpected signal is sent from the PNP switch to the TCM, the transmission 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 5000 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 pres-
sure 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
pressure 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
CVT-50
TROUBLE DIAGNOSIS
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CVT Lock-Up Select Solenoid
●
If an unexpected signal is sent from the solenoid to the TCM, the lock-up select solenoid is turned “off” to
cancel the lock-up.
How To Perform Trouble Diagnosis For Quick and Accurate Repair
ACS001SZ
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
.
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a drivability complaint. The customer
can supply good information about such errors, especially intermit-
tent ones. Find out what symptoms are present and under what con-
ditions they occur. A “Diagnostic Worksheet” as shown on the
example (Refer to
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot drivability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT631IB
SAT632I
SEF234G
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WORK FLOW
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
Make good use of the two sheets provided, “Information From Customer” (Refer to
) and “Diagnostic
Worksheet” (Refer to
), to perform the best troubleshooting possible.
Work Flow Chart
*1.
*2.
*3.
*4.
*5.
*6.
*7.
*8.
*9.
*10.
*11.
*12.
*13.
*14.
*15.
SCIA1973E
CVT-52
TROUBLE DIAGNOSIS
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DIAGNOSTIC WORKSHEET
Information from Customer
KEY POINTS
●
WHAT. . Vehicle & CVT model
●
WHEN. . Date, Frequencies
●
WHERE. . Road conditions
●
HOW. . Operating conditions, Symptoms
Diagnostic Worksheet Chart
Customer name
MR/MS
Model & Year
VIN
Trans. Model
Engine
Mileage
malfunction Date
Manuf. Date
In Service Date
Frequency
❏
Continuous
❏
Intermittent (
times a day)
Symptoms
❏
Vehicle does not move.
(
❏
Any position
❏
Particular position)
❏
No shift
❏
Lock-up malfunction
❏
Shift shock or slip
(
❏
N
→
D
❏
N
→
R
❏
Lock-up
❏
Any drive position)
❏
Noise or vibration
❏
No pattern select
❏
Others
(
)
Malfunction indicator lamp (MIL)
❏
Continuously lit
❏
Not lit
1
❏
Read the item on “cautions concerning fail-safe and understand the customer's complaint.
2
❏
CVT fluid inspection
❏
Leak (Repair leak location.)
❏
State
❏
Amount
3
❏
Stall test and line pressure test
❏
Stall test
❏
Torque converter one-way clutch
❏
Reverse brake
❏
Forward clutch
❏
Steel belt
❏
Engine
❏
Line pressure low
❏
Primary pulley
❏
Secondary pulley
❏
Line pressure inspection - Suspected part:
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4
❏
perform all road tests and enter checks in required inspection items.
4-1.
Check before engine is started
❏
perform self-diagnostics. Enter checks for detected items.
❏
Output speed sensor (secondary speed sensor).
.
❏
Input speed sensor (primary speed sensor).
❏
TCC solenoid valve.
❏
Pressure control solenoid valve A (line pressure solenoid valve).
❏
Pressure control solenoid valve B (secondary pressure solenoid valve).
❏
Transmission fluid pressure sensor A (secondary pressure sensor).
❏
Transmission fluid pressure sensor B (primary pressure sensor).
❏
Lock-up select solenoid valve.
❏
❏
PNP switch.
❏
CVT fluid temperature sensors.
❏
Stop lamp switch signal.
.
❏
.
❏
Accelerator pedal position signal.
❏
Vehicle speed signal.
.
❏
Engine speed signal.
.
❏
CAN communication.
❏
TCM power supply.
❏
Steel belt.
❏
Battery
❏
Other
4-2.
Driving tests
❏
Cannot Be Changed To Second position.
❏
CVT Does Not Shift.
❏
perform self-diagnostics. Enter checks for detected items.
❏
Output speed sensor (secondary speed sensor).
.
❏
Input speed sensor (primary speed sensor).
❏
TCC solenoid valve.
❏
Pressure control solenoid valve A (line pressure solenoid valve).
❏
Pressure control solenoid valve B (secondary pressure solenoid valve).
❏
Transmission fluid pressure sensor A (secondary pressure sensor).
❏
Transmission fluid pressure sensor B (primary pressure sensor).
❏
Lock-up select solenoid valve.
❏
❏
PNP switch.
❏
CVT fluid temperature sensors.
❏
Stop lamp switch signal.
.
❏
.
❏
Accelerator pedal position signal.
❏
Vehicle speed signal.
.
❏
Engine speed signal.
.
❏
CAN communication.
❏
TCM power supply.
❏
Steel belt.
❏
Battery
❏
Other
5
❏
Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunctioning
parts.
6
❏
perform all road tests and enter the checks again for the required items.
7
❏
For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunctioning
parts.
8
❏
Erase the results of the self-diagnostics from the TCM.
CVT-54
TROUBLE DIAGNOSIS
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CVT Electrical Parts Location
ACS001T0
SCIA4282E
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Circuit Diagram
ACS001T1
TCWA0145E
CVT-56
TROUBLE DIAGNOSIS
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Inspections Before Trouble Diagnosis
ACS001T2
CVT FLUID CHECK
Fluid Leakage and Fluid Level Check
●
Inspect for fluid leakage and check the fluid level. Refer to
.
Fluid Condition Check
Inspect the fluid condition.
STALL TEST
Stall Test Procedure
1.
Inspect the amount of engine oil. Replenish the engine oil if necessary.
2.
Drive for about 10 minutes to warm up the vehicle so that the
CVT fluid temperature is 50 - 80
°
C (122 - 176
°
F). Inspect the
amount of CVT fluid. Replenish if necessary.
3.
Securely engage the parking brake so that the tires do not turn.
4.
Engine start, apply foot brake, and place selector lever in “D”
position.
5.
While holding down the foot brake, gradually press down the
accelerator pedal.
6.
Quickly read off the stall speed, and then quickly remove your
foot from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
7.
Move the selector lever to the “N” position.
8.
Cool down the CVT fluid.
Fluid status
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace the ATF and check the
CVT main unit and the vehicle for
malfunctions (wire harnesses,
cooler pipes, etc.)
Milky white or
cloudy
Water in the fluid
Replace the ATF and check for
places where water is getting in.
Large amount of
metal powder mixed
in
Unusual wear of
sliding parts within
CVT
Replace the ATF and check for
improper operation of the CVT.
SAT638A
SAT647B
SCIA1224E
SAT514G
TROUBLE DIAGNOSIS
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CAUTION:
Run the engine at idle for at least one minute.
Judgement Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1.
Inspect the amount of engine oil and replenish if necessary.
2.
Drive the car for about 10 minutes to warm it up so that the CVT fluid reaches in the range of 50 - 80
°
C
(122 - 176
°
F), then inspect the amount of CVT fluid and replenish if necessary.
NOTE:
The automatic fluid temperature rises in the range of 50 - 80
°
C (122 - 176
°
F) during 10 minutes of
driving.
3.
After warming up CVT, remove the oil pressure detection plug and install the oil pressure gauge [special
service tool: ST2505S001 (J34301-C)].
CAUTION:
When using the oil pressure gauge, be sure to use the O- ring attached to the oil pressure detec-
tion plug.
4.
Securely engage the parking brake so that the tires do not turn.
Stall speed
:2,700 - 3,250 rpm
Selector lever position
Expected problem location
D
R
Stall rotation
H
O
●
Forward clutch
O
H
●
Reverse brake
L
L
●
Engine and torque converter one-way clutch
H
H
●
Line pressure low
●
Primary pulley
●
Secondary pulley
●
Steel belt
SCIA1980E
SCIA1224E
CVT-58
TROUBLE DIAGNOSIS
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5.
Start the engine, and then measure the line pressure at both idle
and the stall speed.
CAUTION:
●
Keep the brake pedal pressed all the way down during
measurement.
●
When measuring the line pressure at the stall speed,
refer to
6.
After the measurements are complete, install the oil pressure
detection plug and tighten to the regulation torque below.
CAUTION:
Do not reuse the O-ring.
Line Pressure
*1: Reference values.
Judgement of Line Pressure Test
:5.0 - 10 N-m (0.51 - 1.0 kg-m, 45 - 88 in-lb)
SAT493G
Engine
Engine speed
Line Pressure
kPa (kg/cm
2
, psi)
R,D,L positions
VQ35DE
At idle speed
750 (7.65, 108.8)
At stall speed
5300 - 5700 (54.06 - 58.14, 768.5 - 826.5)*
1
Judgement Possible
cause
Idle speed
Low 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
Þ
oil pump
Þ
pressure regulator valve passage oil leak
●
Engine idle speed too low
Only low for a spe-
cific position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High
Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
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
TROUBLE DIAGNOSIS
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ROAD TEST
Description
●
The purpose of the test is to determine overall performance of CVT and analyze causes of problems.
●
Before road test, familiarize yourself with all test procedures and
items to check.
●
perform tests on all items until specified symptom is found. Trou-
bleshoot items which check out No Good after road test. Refer
to
CVT-45, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"
Cruse Test
With CONSULT-II
●
Using CONSULT-II, perform a cruise test and record the result.
●
Print the result and ensure that shifts and lock-ups take place as
per Shift Schedule.
CONSULT-II Setting Procedure
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1.
Turn ignition switch “OFF”.
Stall speed
Oil pressure does
not rise higher than
the oil pressure for
idle.
Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example
●
Accelerator pedal position signal malfunction
●
TCM breakdown
●
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 posi-
tion.
Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure 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 spe-
cific position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
Judgement Possible
cause
SAT496G
SAT601J
CVT-60
TROUBLE DIAGNOSIS
Revision; 2004 April
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2.
Connect CONSULT-II and CONSULT-II CONVERSTER to data
link connector, which is located in lower instrument panel on
driver side.
3.
Turn ignition switch “ON”.
4.
Touch “START (NISSAN BASED VHCL)”.
5.
Touch “TRANSMISSION”.
If “TRANSMISSION” or “ENGINE” is not indicated, go to
"CONSULT-II Data Link Connector (DLC) Circuit"
.
6.
Touch “DATA MONITOR”.
PBIB0196E
SAIA0450E
SCIA2272E
SCIA5492E
TROUBLE DIAGNOSIS
CVT-61
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7.
Touch “MAIN SIGNALS” to set recording condition.
8.
See “Numerical Display”, “Barchart Display” or “Line Graph Dis-
play”.
9.
Touch “START”.
10. When performing cruise test, touch “Store Data”.
11. After finishing cruise test part 1, touch “STOP”.
12. Touch “STORE”.
SCIA5493E
SAT236K
SAT237K
SAT254K
CVT-62
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13. Touch “DISPLAY”.
14. Touch “PRINT”.
15. Check the monitor data printed out.
Vehicle Speed When Shifting Gears
ACS001T8
Numerical value data are reference values.
CAUTION:
Lock-up clutch is engaged when vehicle speed is approximately 18 km/h (11MPH) to 40 km/h (25MPH).
SAT608J
SAT974J
SAT238K
Engine type
Throttle position
Shift pattern
Engine speed (rpm)
At 40 km/h (25MPH)
At 60 km/h (37MPH)
VQ35DE
8/8
D position
Second position
L position
2,800 - 4,300
3,900 - 5,300
2/8
D position
1,200 - 2,000
1,300 - 2,100
Second position
2,200 - 3,000
2,800 - 3,600
L position
2,800 - 3,600
3,800 - 4,600
TROUBLE DIAGNOSIS
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TCM Input/Output Signal Reference Values
ACS001TC
TCM TERMINAL CONNECTOR LAYOUT
TCM INSPECTION TABLE
Data are reference values and are measured between each terminal and ground.
SCIA0495E
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
1
R/Y
Pressure control
solenoid valve A
(line pressure
solenoid valve)
Release your foot from the accelerator pedal.
5.0 - 7.0V
Press the accelerator pedal all the way down.
1.0V
2
W/B
Pressure control
solenoid valve B
(secondary pres-
sure solenoid
valve)
Release your foot from the accelerator pedal.
5.0 - 7.0V
Press the accelerator pedal all the way down.
3.0 - 4.0V
3
L/W
TCC solenoid
valve
When
vehicle
cruises
Lock-up applied to lock-up cancelled
6.0 - 1.0V
4
L/Y
Lock-up select
solenoid valve
N position
Battery voltage
Wait at least for 5 seconds with the selector lever in D
position
0V
5
L
CAN H
–
–
6
Y
CAN L
–
–
8
SB
Back-up lamp
relay
Selector lever in “R” position.
Battery voltage
Selector lever in other positions.
0V
10
Y/L
Power supply
—
Battery voltage
—
0V
11
G/R
Step motor A
Within 2 seconds after key switch “ON”, the time measurement by
using the pulse width measurement function (Hi level) of CONSULT-
II.*1
CAUTION:
Connect the diagnosis data link cable to the vehicle diagnosis
connector.
*1: A circuit tester cannot be used to test this item.
30.0 msec
12
O/B
Step motor B
10.0 msec
13
G/W
ROM assembly
—
—
—
—
14
L/R
ROM assembly
—
—
—
—
CVT-64
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15
BR/R
ROM assembly
—
—
—
—
19
Y/L
Power supply
—
Battery voltage
—
0V
20
R
Step motor C
Within 2 seconds after key switch “ON”, the time measurement by
using the pulse width measurement function (Hi level) of CONSULT-
II.*1
CAUTION:
Connect the diagnosis data link cable to the vehicle diagnosis
connector.
*1: A circuit tester cannot be used to test this item.
30.0 msec
21
R/G
Step motor D
10.0 msec
24
G/O
Starter relay
Selector lever in “N”,“P”position.
Battery voltage
Selector lever in other position.
0V
—
0V
25
B
Ground
—
0V
27
BR/W
PNP switch 1
Selector lever in “R”,“N”,“D”position.
0V
Selector lever in other position.
Battery voltage
28
Y/R
Power supply
(Memory back-up)
—
Battery voltage
29
LG/R
Output speed sen-
sor (secondary
speed sensor)
When
vehicle
cruises
When driving [D position, 20 km/h (12 MPH)]
300 (Hz)
32
GR
PNP switch 3
(monitor)
Selector lever in “D”,“L” position.
0V
Selector lever in other positions.
Battery voltage
34
P/B
PNP switch 2
Selector lever in “N”,“D”,“L”position.
0V
Selector lever in other positions.
Battery voltage
35
P/L
PNP switch 3
Selector lever in “D”,“L” position.
0V
Selector lever in other positions.
Battery voltage
36
G
PNP switch 4
Selector lever in “R”, “D”position.
0V
Selector lever in other positions.
Battery voltage
37
V/W
Transmission fluid
pressure sensor A
(secondary pres-
sure sensor)
N position idle
0.8V
38
LG
Input speed sen-
sor (primary
speed sensor)
When
vehicle
cruises
When driving [L position, 20 km/h (12 MPH)]
600 (Hz)
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
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