Nissan Altima L32. Instruction — part 1460
TM-184
< COMPONENT DIAGNOSIS >
[CVT: RE0F09B]
P1777 STEP MOTOR
P1777 STEP MOTOR
Description
INFOID:0000000004201762
The step motor changes the step with 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.
DTC Logic
INFOID:0000000004201763
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.
CHECK DTC DETECTION
With CONSULT-III
1. Start engine.
2. Drive vehicle for at least 5 consecutive seconds.
3. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is “P1777 STEP MOTR CIRC” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000004201764
1.
CHECK STEP MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector.
3. Check resistance between TCM harness connector F16 terminal
27, 29 and 28, 30.
DTC
Item
(CONSULT-III screen term)
Malfunction is detected when...
Possible cause
P1777
STEP MOTR CIRC
Each coil of the step motor is not energized
properly due to an open or a short.
• Harness or connectors
(Step motor circuit is open or shorted.)
• Step motor
TCM harness connector
Resistance (Ap-
prox.)
Connector
Terminal
F16
27
28
30.0
Ω
29
30
AWDIA0148ZZ
P1777 STEP MOTOR
TM-185
< COMPONENT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
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M
A
B
TM
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P
4. Check resistance between TCM harness connector F16 terminal
27, 28, 29, 30 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)
1. Disconnect CVT unit harness connector.
2. Check continuity between TCM harness connector F16 (A) ter-
minal 27, 28, 29, 30 and CVT unit harness connector F46 (B)
terminal 9, 8, 7, 6.
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 harness connector F16 terminal 27,
28, 29, 30 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-186, "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?
TCM harness connector
Ground
Resistance (Ap-
prox.)
Connector
Terminal
F16
27
15.0
Ω
28
29
30
AWDIA0149ZZ
TCM harness connector
CVT unit harness connector
Continuity
Connector
Terminal
Connector
Terminal
F16 (A)
27
F46 (B)
9
Existed
28
8
29
7
30
6
AWDIA0150ZZ
TCM harness connector
Ground
Continuity
Connector
Terminal
F16
27
Not existed
28
29
30
AWDIA0149ZZ
TM-186
< COMPONENT DIAGNOSIS >
[CVT: RE0F09B]
P1777 STEP MOTOR
YES
>> Replace TCM. Refer to
NO
>> Repair or replace damaged parts.
Component Inspection (Step Motor)
INFOID:0000000004201765
1.
CHECK STEP MOTOR
1. Check resistance between CVT unit terminal 6, 8 and 7, 9.
2. Check resistance between CVT unit terminal 6, 7, 8, 9 and
ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace transaxle assembly. Refer to
CVT unit terminals
Resistance (Approx.)
6
7
30.0
Ω
8
9
AWDIA0151ZZ
CVT unit terminal
Ground
Resistance (Approx.)
6
15.0
Ω
7
8
9
AWDIA0152ZZ
P1778 STEP MOTOR - FUNCTION
TM-187
< COMPONENT DIAGNOSIS >
[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
P1778 STEP MOTOR - FUNCTION
Description
INFOID:0000000004201766
• The step motor's 4 aspects of ON/OFF change 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 electrical system is OK, but mechanical system is NG.
• This diagnosis item is detected when the state of the changing the speed mechanism in unit does not oper-
ate normally.
DTC Logic
INFOID:0000000004201767
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” on “DATA MONITOR MODE”.
• If hi-geared fixation occurred, go to
NOTE:
If “DTC CONFIRMATION PROCEDURE” has been previously performed, 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”.
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 STEP MOTR/FNC” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000004201768
1.
CHECK STEP MOTOR SYSTEM
Check step motor system. Refer to
Is the inspection result normal?
DTC
Item
(CONSULT-III screen term)
Malfunction is detected when...
Possible cause
P1778
STEP MOTR/FNC
There is a great difference between the
number of steps for the stepping motor and
for the actual gear ratio.
Step motor
ATF TEMP SEN
: 1.0 – 2.0 V
If 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)
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION
: Keep 30 sec 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
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