Nissan Frontier D22. Manual - part 14

OVERALL SYSTEM

AT-25

[RL4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Overrun clutch reducing valve

Controls pressure that operates the overrun clutch to relief shocks caused during 
engine braking.
Line pressure acts on the overrun clutch reducing valve in the 1st or 2nd position to 
increase the pressure-regulating point with resultant high engine braking capabilities.

4th speed cut valve

Determines lock-up speed while operating in 4th gear.

●

Torque converter clutch control valve

●

Torque converter clutch solenoid valve

Activates or deactivates lock-up system.

Torque converter relief valve

Prevents abnormal increase of converter oil pressure.

Valve Name

Function

AT-26

[RL4R01A]

TROUBLE DIAGNOSIS — BASIC INSPECTION

TROUBLE DIAGNOSIS — BASIC INSPECTION

PFP:00000

A/T Fluid Check

ECS007IR

FLUID LEAKAGE CHECK

1.

Clean area suspected of leaking, — for example, mating surface
of converter housing and transmission case.

2.

Start engine, apply foot brake, place selector lever in D position
and wait a few minutes.

3.

Stop engine.

4.

Check for fresh leakage.

FLUID CONDITION CHECK

FLUID LEVEL CHECK

Refer to 

MA-37, "Checking A/T Fluid"

 .

Stall Test

ECS007IS

STALL TEST PROCEDURE

1.

Check A/T fluid and engine oil levels. If necessary, add fluid and
oil.

2.

Drive vehicle for approx. 10 minutes or until fluid and oil reach
operating temperature.

3.

Set parking brake and block wheels.

4.

Install a tachometer where it can be seen by driver during test.

●

It is good practice to put a mark on point of specified
engine speed on indicator.

SAT288G

Fluid color

Suspected problem

Dark or black with burned odor

Wear of frictional material

Milky pink

Water contamination

●

Road water entering through filler 
tube or breather

Varnished fluid, light to dark brown and 
tacky

Oxidation

●

Over or under filling

●

Overheating

SAT638A

ATF operating temperature

: 50 - 80

°C (122 - 176°F)

SAT647B

SAT513G

TROUBLE DIAGNOSIS — BASIC INSPECTION

AT-27

[RL4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

5.

Start engine, apply foot brake, and place selector lever in D
position.

6.

Accelerate to wide open throttle gradually while applying foot
brake.

●

During test, never hold throttle wide open for more than 5
seconds.

7.

Quickly note the engine stall revolution and immediately release
throttle.

8.

Shift selector lever to N position.

9.

Cool off ATF.

●

Run engine at idle for at least one minute.

10. Repeat steps 5 through 9 with selector lever in 2, 1 and R posi-

tions.

Stall revolution standard

: 2,100 - 2,300 rpm

SAT514G

SAT414F

AT-28

[RL4R01A]

TROUBLE DIAGNOSIS — BASIC INSPECTION

JUDGEMENT OF STALL TEST

LCIA0280E