Nissan Murano Z51. Manual — part 1437
P1778 STEP MOTOR
TM-99
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
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P1778 STEP MOTOR
Description
INFOID:0000000005514060
• 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:0000000005514061
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-III
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-III”.
Is “P1778” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000005514062
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
TM-100
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
P1778 STEP MOTOR
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.
SHIFT POSITION INDICATOR CIRCUIT
TM-101
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
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SHIFT POSITION INDICATOR CIRCUIT
Description
INFOID:0000000005514063
• TCM sends position indicator signals to combination meter via CAN communication line.
• The selector lever position is indicated on the shift position indicator.
Component Function Check
INFOID:0000000005514064
1.
CHECK SHIFT POSITION INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1.
Start engine.
2.
Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000005514065
1.
CHECK INPUT SIGNALS
With CONSULT-III
1.
Start engine.
2.
Select “RANGE” in “Data Monitor” and read out the value.
3.
Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES
>> INSPECTION END
NO-1 (CVT position indicator does not indicate “L” when selector lever is moved into “L”.)>>Check the fol-
lowing.
• Check overdrive control switch. Refer to
.
• Check CVT main system (Fail-safe function actuated).
- Perform “Self Diagnostic Results” in “TRANSMISSION”.
NO-2 (The actual gear position changes, but the shift position indicator is not indicated.)>>Perform
“Self
Diagnostic Results” in “TRANSMISSION”.
NO-3 (The actual gear position and the indication on the shift position indicator do not coincide.)>>Perform
“Self Diagnostic Results” in “TRANSMISSION”.
NO-4 (Only a specific position or positions is/are not indicated on the shift position indicator.)>>Check
the
combination meter. Refer to
MWI-34, "CONSULT-III Function (METER/M&A)"
.
TM-102
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F09B]
SHIFT LOCK SYSTEM
SHIFT LOCK SYSTEM
Description
INFOID:0000000005514066
Component
Function
Shift lock solenoid
It operates according to the signal from the stop lamp switch and
moves the lock lever.
Lock lever
It moves according to the operation of the shift lock solenoid and
performs the release of the shift lock.
Detent rod
It links with the selector button and restricts the selector lever
movement.
Park position switch
It detects that the selector lever is in “P” position.
Shift lock release button
It moves the lock lever forcibly.
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