Nissan Versa Sedan. Manual — part 806
TM-130
< BASIC INSPECTION >
[4AT: RE4F03C]
LINE PRESSURE TEST
LINE PRESSURE TEST
Work Procedure
INFOID:0000000009267880
INSPECTION
1. Inspect the amount of engine oil. Replenish the engine oil if necessary. Refer to
.
2. Drive for about 10 minutes to warm up the vehicle so that the A/T fluid temperature is to 50 to 80
°C (122
to 176
°F).
3. Inspect the amount of ATF. Replenish if necessary. Refer to
.
4. Remove fluid pressure detection plug.
5. Install the joint pipe adapter [SST: KV31103600 ( — )],
adapter [SST: 25054000 (J-25695-4)], and oil pressure gauge
set (commercial service tool).
NOTE:
When using oil pressure gauge, be sure to use O-ring attached
to fluid pressure detection plug.
6. Securely engage parking brake so that the tires do not turn.
7. Start the engine.
8. Measure the line pressure at both idle and the stall speed.
CAUTION:
Keep brake pedal pressed all the way down during measurement.
9. Install O-rig to fluid pressure detection plug.
CAUTION:
• Do not reuse O-ring.
• Apply ATF to O-ring.
10. Install fluid pressure detection plug.
JUDGMENT
1
: “D” position fluid pressure detection plug
2
: “R” position fluid pressure detection plug
Line pressure
: 7.4 N·m (1.70 lb-m, 66 in-lb)
JSDIA2020ZZ
Judgment Possible
cause
Idle speed
Low for all positions
(“P”, “R”, “N”, “D”, “2”,
“1”)
Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
• Oil pump wear
• Pressure regulator valve or plug sticking or spring fatigue
• Oil strainer
⇒ oil pump ⇒ pressure regulator valve passage oil leak
• Engine idle speed too low
Only low for a specific
position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High
Possible causes include a sensor malfunction or malfunction in the line pressure adjustment
function.
For example
• Accelerator pedal position signal malfunction
• Line pressure solenoid malfunction (sticking in OFF state, filter clog, cut line)
• Pressure regulator valve or plug sticking
• Engine idle speed too high
LINE PRESSURE TEST
TM-131
< BASIC INSPECTION >
[4AT: RE4F03C]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
Stall speed
Line pressure does not
rise higher than the line
pressure for idle.
Possible causes include a sensor malfunction or malfunction in the pressure adjustment func-
tion.
For example
• TCM malfunction
• Line pressure solenoid malfunction (shorting, sticking in ON state)
• Pressure regulator valve or plug sticking
The pressure rises, but
does not enter the
standard position.
Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example
• Oil pump wear
• Line pressure solenoid malfunction (sticking, filter clog)
• Pressure regulator valve or plug sticking
Only low for a specific
position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
Judgment Possible
cause
TM-132
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
U0073 COMMUNICATION BUS A OFF
DTC/CIRCUIT DIAGNOSIS
U0073 COMMUNICATION BUS A OFF
DTC Logic
INFOID:0000000009267881
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn the ignition switch OFF and wait for
at least 10 seconds, then perform the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait for at least 5 seconds.
2. Check the DTC.
Is “U0073” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009267882
For the diagnosis procedure, refer to
LAN-15, "Trouble Diagnosis Flow Chart"
DTC
Trouble diagnosis name
DTC detecting condition
Possible causes
U0073
Control Module Communication
Bus “A” Off
When the ignition switch is ON,
TCM detects a bus-off error
continuously for 2 seconds or
more.
Harness or connector
(CAN communication line is
open or shorted)
U0100 LOST COMMUNICATION (ECM A)
TM-133
< DTC/CIRCUIT DIAGNOSIS >
[4AT: RE4F03C]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
U0100 LOST COMMUNICATION (ECM A)
DTC Logic
INFOID:0000000009267883
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn the ignition switch OFF and wait for
at least 10 seconds, then perform the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait for at least 5 seconds.
2. Check the DTC.
Is “U0100” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009267884
For the diagnosis procedure, refer to
LAN-15, "Trouble Diagnosis Flow Chart"
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
U0100
Lost Communication With
ECM/PCM “A”
When the ignition switch is ON,
TCM is unable to receive the
CAN communications signal
from ECM continuously for 2
seconds or more.
• ECM
• Harness or connector
(CAN communication line is
open or shorted)
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