Nissan Quest E52. Instruction — part 1224
TM-126
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P1777 STEP MOTOR
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> GO TO 2.
2.
CHECK STEP MOTOR
1.
Disconnect the CVT unit connector.
2.
Check the step motor. Refer to
TM-126, "Component Inspection (Step Motor)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace the transaxle assembly due to malfunction in the step motor. Refer to
.
3.
CHECK HARNESS BETWEEN TCM AND CVT UNIT
1.
Check the continuity between TCM harness connector terminals and CVT unit harness connector termi-
nals.
2.
Check the continuity between TCM harness connector terminals and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> Repair or replace damaged parts.
Component Inspection (Step Motor)
INFOID:0000000009650203
1.
CHECK STEP MOTOR
1.
Check the resistance between CVT unit connector terminals.
2.
Check the resistance between CVT unit connector terminals and ground.
TCM
—
Resistance (Approx.)
Connector
Terminal
F23
27
Ground
15.0
Ω
28
29
30
TCM
CVT unit
Continuity
Connector
Terminal
Connector
Terminal
F23
27
F24
9
Existed
28
8
29
7
30
6
TCM
—
Continuity
Connector
Terminal
F23
27
Ground
Not existed
28
29
30
CVT unit
Resistance (Approx.)
Terminal
6
7
30.0
Ω
8
9
P1777 STEP MOTOR
TM-127
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace the transaxle assembly due to malfunction in the step motor. Refer to
.
CVT unit
—
Resistance (Approx.)
terminal
6
Ground
15.0
Ω
7
8
9
TM-128
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P1778 STEP MOTOR
P1778 STEP MOTOR
Description
INFOID:0000000009650204
• 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:0000000009650205
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
• Always drive vehicle at a safe speed.
• Check primary speed and vehicle speed before perform “DTC CONFIRMATION PROCEDURE”.
• If hi-geared fixation occurred, go to
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT
1.
Start the engine.
2.
Warm up the engine. [Set the CVT fluid to 20
°
C (68
°
F) or more.]
NOTE:
When the ambient temperature is 20
°
C (68
°
F), the CVT fluid usually increases to 50 to 80
°
C (122 to
176
°
F) with driving in an urban area for approximately 10 minutes.
3.
Maintain the following conditions for at least 30 seconds.
With GST
Follow the procedure “With CONSULT”.
Is “P1778” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009650206
1.
CHECK STEP MOTOR SYSTEM
DTC
Trouble diagnosis name
DTC detection condition
Possible cause
P1778
Step Motor Circuit Intermit-
tent
When below diagnosis conditions are met, the difference
between actual primary speed and command primary
speed calculated by shift control logic exceeds 1,000 rpm
and keeps the status for 5 seconds or more
• Diagnosis Conditions
- Selector lever: “D” position
- Vehicle speed: 11 km/h (7 MPH) or more
- Accelerator pedal position: 1.1/8
- Engine speed: 450 rpm or more
- CVT fluid temperature: 20
°
C – 180
°
C (68
°
F – 356
°
F)
Step motor
Selector lever
: “D” position
Accelerator pedal position
: 1.1/8 or more
Vehicle speed
: 20 km/h (13 MPH) or more
P1778 STEP MOTOR
TM-129
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Check the step motor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts.
2.
CHECK PRIMARY SPEED SENSOR SYSTEM
Check the 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 the secondary speed sensor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace the transaxle assembly. Refer to
TM-174, "Removal and Installation"
.
NO
>> Repair or replace damaged parts.
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