Nissan Terrano r20e. Instruction — part 8
JUDGEMENT OF STALL TEST
SAT392H
TROUBLE DIAGNOSIS — Basic Inspection
Stall Test (Cont’d)
AT-29
Line Pressure Test
LINE PRESSURE TEST PORTS
I
Location of line pressure test ports.
I
Always replace line pressure plugs as they are self-
sealing bolts.
LINE PRESSURE TEST PROCEDURE
1. Check A/T and engine fluid levels. If necessary, add fluid.
2. Drive vehicle for approx. 10 minutes or until engine oil and ATF
reach operating temperature.
ATF operating temperature:
50 - 80°C (122 - 176°F)
3. Install pressure gauge to corresponding line pressure port.
SAT209GA
SAT647B
SAT518GB
SAT519GA
TROUBLE DIAGNOSIS — Basic Inspection
AT-30
4. Set parking brake and block wheels.
I
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.
I
When measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure:
Refer to SDS, AT-196.
JUDGEMENT OF LINE PRESSURE TEST
Judgement
Suspected parts
At idle
Line pressure is low in all
positions.
I
Oil pump wear
I
Control piston damage
I
Pressure regulator valve or plug sticking
I
Spring for pressure regulator valve damaged
I
A/T fluid pressure leakage between oil strainer and pressure regulator valve
I
Clogged strainer
Line pressure is low in par-
ticular position.
I
Fluid pressure leakage between instruction valve and particular clutch
I
For example, line pressure is:
— Low in “R” and “1” positions,
— Normal in “D” and “2” positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to “CLUTCH AND BAND CHART”, AT-11.
Line pressure is high.
I
Mal-adjustment of throttle position sensor
I
A/T fluid temperature sensor damaged
I
Line pressure solenoid valve sticking
I
Short circuit of line pressure solenoid valve circuit
I
Pressure modifier valve sticking
I
Pressure regulator valve or plug sticking
I
Open in dropping resistor circuit
At stall speed
Line pressure is low.
I
Mal-adjustment of throttle position sensor
I
Line pressure solenoid valve sticking
I
Short circuit of line pressure solenoid valve circuit
I
Pressure regulator valve or plug sticking
I
Pressure modifier valve sticking
I
Pilot valve sticking
SAT513G
SAT493G
TROUBLE DIAGNOSIS — Basic Inspection
Line Pressure Test (Cont’d)
AT-31
Road Test
DESCRIPTION
I
The purpose of the test is to determine overall performance of
A/T and analyze causes of problems.
I
The road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
3. Cruise test
I
Before road test, familiarize yourself with all test procedures
and items to check.
I
Conduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to “ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION”
and “DIAGNOSTIC PROCEDURES FOR SYMPTOMS”, AT-14
- AT-20 and AT-92 - AT-112.
SAT786A
SAT496G
TROUBLE DIAGNOSIS — Basic Inspection
AT-32
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