Nissan Murano. Instruction — part 1390
TM-102
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P1777 STEP MOTOR
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)
1.
Disconnect CVT unit connector.
2.
Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side har-
ness connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 2)
Check continuity between TCM vehicle side harness connector terminals and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK STEP MOTOR
Check step motor. Refer to
TM-102, "Component Inspection (Step Motor)"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace transaxle assembly. Refer to
5.
DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
NO
>> Repair or replace damaged parts.
Component Inspection (Step Motor)
INFOID:0000000009719521
1.
CHECK STEP MOTOR
1.
Check resistance between CVT unit connector terminals.
TCM vehicle side harness connector
CVT unit vehicle side harness connector
Continuity
Connector
Terminal
Connector
Terminal
F23
27
F24
9
Existed
28
8
29
7
30
6
TCM vehicle side harness connector
Ground
Continuity
Connector
Terminal
F23
27
Not existed
28
29
30
CVT unit connector
Resistance (Approx.)
Connector
Terminals
F24
6
7
30.0
Ω
8
9
P1777 STEP MOTOR
TM-103
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
2.
Check resistance between CVT unit connector terminals and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace transaxle assembly. Refer to
CVT unit connector
Ground
Resistance (Approx.)
Connector
terminal
F24
6
15.0
Ω
7
8
9
TM-104
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P1778 STEP MOTOR
P1778 STEP MOTOR
Description
INFOID:0000000009719522
• The step motor changes the step by turning 4 coils ON/OFF 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 the electrical system is OK, but the mechanical system is NG.
• This diagnosis item is detected when the state of the changing of the speed mechanism in the unit does not
operate normally.
DTC Logic
INFOID:0000000009719523
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
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” in “Data Monitor”.
• If hi-geared fixation occurred, go to
NOTE:
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.
CHECK DTC DETECTION
With CONSULT
1.
Turn ignition switch ON.
2.
Select “Data Monitor” in “TRANSMISSION”.
3.
Make sure that output voltage of CVT fluid temperature sensor is within the range below.
4.
Start engine and maintain the following conditions for at least 30 consecutive seconds.
With GST
Follow the procedure “With CONSULT”.
Is “P1778” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000009719524
1.
CHECK STEP MOTOR SYSTEM
Check step motor system. Refer to
.
Is the inspection result normal?
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P1778
Step Motor Circuit Intermit-
tent
There is a big difference between the num-
ber of steps for the stepping motor and for
the actual gear ratio.
Step motor
ATF TEMP SEN
: 1.0 – 2.0 V
If it is 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)
Start test from 0 km/h (0 MPH)
Constant acceleration
: Keep 30 seconds 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
P1778 STEP MOTOR
TM-105
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts.
2.
CHECK PRIMARY SPEED SENSOR SYSTEM
Check primary speed sensor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK SECONDARY SPEED SENSOR SYSTEM
Check secondary speed sensor system. Refer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
NO
>> Repair or replace damaged parts.
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