Nissan Versa Sedan. Instruction - 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 

LU-8, "Inspection"

.

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 

TM-230, "Inspection"

.

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

: 

TM-255, "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 instruction 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 instruction 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 

TM-132, "Diagnosis Procedure"

.

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 

TM-133, "Diagnosis Procedure"

.

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)