Nissan Altima L32. Instruction — part 1504
TM-360
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
P1745 LINE PRESSURE CONTROL
P1745 LINE PRESSURE CONTROL
Description
INFOID:0000000004201957
The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to a signal sent from the TCM.
DTC Logic
INFOID:0000000004201958
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
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.
Is “P1745 L/PRESS CONTROL” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000004201959
1.
CHECK DTC
With CONSULT-III
1. Start engine.
2. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
is “P1745 L/PRESS CONTROL” displayed?
YES
TM-430, "Removal and Installation"
NO
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
DTC
Item
(CONSULT-III screen term)
Malfunction is detected when...
Possible cause
P1745
L/PRESS CONTROL
TCM detects the unexpected line pressure.
TCM
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)
P1777 STEP MOTOR
TM-361
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
P1777 STEP MOTOR
Description
INFOID:0000000004201960
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:0000000004201961
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:0000000004201962
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
TM-362
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
P1777 STEP MOTOR
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-363, "Component Inspection (Step Motor)"
.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK DTC
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “SELFDIAG RESULTS” mode for “TRANSMISSION”.
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
P1777 STEP MOTOR
TM-363
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Is “P1777 STEP MOTER CIRC” detected?
YES (Only DTC P1777 detected)>>Replace control valve. Refer to
.
YES (DTC P0725 and DTC U1000 in addition to DTC P1777 are detected)>>When DTC is detected as
listed below, replace control valve. Refer to
.
• DTC for P1777 and P0725 are detected.
• DTC for P1777 and U1000 are detected.
• DTC for P1777, P0725 and U1000 are detected.
NO
>> Replace transaxle assembly. Refer to
TM-447, "Removal and Installation"
.
6.
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:0000000004201963
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
>> Perform “SELFDIAG RESULTS” mode for “TRANSMISSION”.
CVT unit terminal
Resistance (Approx.)
6
7
30.0
Ω
8
9
AWDIA0151ZZ
CVT unit terminal
Ground
Resistance (Approx.)
6
15.0
Ω
7
8
9
AWDIA0152ZZ
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