Infiniti QX4 (R50). Manual — part 16
SAT392H
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Stall Test (Cont’d)
AT-61
SAT209GA
Line Pressure Test
NBAT0023
I
Location of line pressure test ports.
I
Always replace line pressure plugs as they are self-seal-
ing bolts.
SAT647B
LINE PRESSURE TEST PROCEDURE
NBAT0023S01
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.
ATF operating temperature:
50 - 80°C (122 - 176°F)
SAT518GB
SAT519GB
3.
Install pressure gauge to corresponding line pressure port.
SAT513G
4.
Set parking brake and block wheels.
I
Continue to depress brake pedal fully while line pressure
test is being performed at stall speed.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test
AT-62
SAT493G
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-356.
JUDGEMENT OF LINE PRESSURE TEST
NBAT0023S02
Judgement
Suspected parts
At idle
Line pressure is low in all posi-
tions.
I
Oil pump wear
I
Control piston damage
I
Pressure regulator valve or plug sticking
I
Spring for pressure regulator valve damaged
I
Fluid pressure leakage between oil strainer and pressure regulator valve
I
Clogged strainer
Line pressure is low in particu-
lar position.
I
Fluid pressure leakage between manual valve and particular clutch
I
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 “CLUTCH AND BAND CHART”, AT-17.
Line pressure is high.
I
Mal-adjustment of throttle position sensor
I
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
SAT786A
Road Test
NBAT0024
DESCRIPTION
NBAT0024S01
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
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test (Cont’d)
AT-63
SAT496G
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 DESCRIP-
TION” and “TROUBLE DIAGNOSES FOR SYMPTOMS”,
AT-33 - AT-50 and AT-215 - AT-257.
1. CHECK BEFORE ENGINE IS STARTED
NBAT0024S02
1
CHECK O/D OFF INDICATOR LAMP
1. Park vehicle on flat surface.
2. Move selector lever to “P” position.
3. Turn ignition switch to “OFF” position.
Wait at least 5 seconds.
SAT967I
4. Turn ignition switch to “ON” position. (Do not start engine.)
5. Does O/D OFF indicator lamp come on for about 2 seconds?
SAT133K
Yes or No
Yes
©
GO TO 2.
No
©
Go to “1. O/D OFF Indicator Lamp Does Not Come On”, AT-218.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-64
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