Nissan Frontier D22. Manual - part 61

TROUBLE DIAGNOSIS — BASIC INSPECTION

AT-213

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Stall revolution less than specifications:

●

Poor acceleration during starts. ..... One-way clutch seizure in torque converter

LCIA0265E

AT-214

[RE4R01A]

TROUBLE DIAGNOSIS — BASIC INSPECTION

Line Pressure Test

ECS007LY

LINE PRESSURE TEST PORTS

●

Location of line pressure test ports.

●

 Always replace line pressure plugs as they are self-sealing
bolts.

LINE PRESSURE TEST PROCEDURE

1.

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

2.

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

3.

Install pressure gauge to corresponding line pressure port.

SAT209GA

ATF operating temperature

: 50 - 80

°C (122 - 176°F)

SAT647B

SAT518GB

SAT519GB

TROUBLE DIAGNOSIS — BASIC INSPECTION

AT-215

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

4.

Set parking brake and block wheels.

●

 Continue to depress brake pedal fully while line pressure
test is being performed at stall speed.

5.

Start engine and measure line pressure at idle and stall speed.

●

When measuring line pressure at stall speed, follow the
stall test procedure.

JUDGEMENT OF LINE PRESSURE TEST

SAT513G

Line pressure

: Refer to 

AT-497, "Line Pressure"

 .

SAT493G

Judgement

Suspected parts

At idle

Line pressure is low in all posi-
tions.

●

Oil pump wear

●

Control piston damage

●

Pressure regulator valve or plug sticking

●

Spring for pressure regulator valve damaged

●

Fluid pressure leakage between oil strainer and pressure regulator valve

●

Clogged strainer

Line pressure is low in particular 
position.

●

Fluid pressure leakage between manual valve and particular clutch

●

For example, line pressure is:
— Low in R and 1 positions, but
— Normal in D and 2 positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to 

AT-498, "Clutches and Brakes"

 .

Line pressure is high.

●

Maladjustment of throttle position sensor

●

Fluid temperature sensor damaged

●

Line pressure solenoid valve sticking

●

Short circuit of line pressure solenoid valve circuit

●

Pressure modifier valve sticking

●

Pressure regulator valve or plug sticking

●

Open in dropping resistor circuit

At stall speed

Line pressure is low.

●

Maladjustment of throttle position sensor

●

Line pressure solenoid valve sticking

●

Short circuit of line pressure solenoid valve circuit

●

Pressure regulator valve or plug sticking

●

Pressure modifier valve sticking

●

Pilot valve sticking

AT-216

[RE4R01A]

TROUBLE DIAGNOSIS — BASIC INSPECTION

Road Test

ECS007LZ

DESCRIPTION

●

The purpose of the test is to determine overall performance of A/
T and analyze causes of problems.

●

The road test consists of the following three parts:

–

Check before engine is started

–

Check at idle

–

Cruise test

●

Before road test, familiarize yourself with all test procedures and
items to check.

●

Conduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to 

AT-185, "ON BOARD DIAGNOSTIC SYSTEM

DESCRIPTION"

  and 

AT-353, "TROUBLE DIAGNOSES FOR

SYMPTOMS"

 .

SAT786A

SAT496G