Infiniti I30 (A33). Manual — part 17
SAT301FA
Line Pressure Test
NHAT0028
LINE PRESSURE TEST PORTS
NHAT0028S01
Location of line pressure test ports are shown in the illustration.
I
Always replace pressure plugs as they are self-sealing
bolts.
SAT647B
LINE PRESSURE TEST PROCEDURE
NHAT0028S02
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)
AAT898
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.
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-382.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test
AT-65
JUDGEMENT OF LINE PRESSURE TEST
NHAT0028S03
Judgement
Suspected parts
At idle
Line pressure is low in all positions.
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Oil pump wear
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Control piston damage
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Pressure regulator valve or plug sticking
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Spring for pressure regulator valve damaged
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Fluid pressure leakage between oil strainer and
pressure regulator valve
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Clogged strainer
Line pressure is low in particular position.
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Fluid pressure leakage between manual valve and
particular clutch
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For example, line pressure is:
− Low in R and 1 positions, but
− Normal in D and 2 positions.
Therefore, fluid leakage exists at or around low and
reverse brake circuit.
Refer to “CLUTCH AND BAND CHART”, AT-19.
Line pressure is high.
I
Maladjustment of throttle position sensor
I
A/T fluid temperature sensor damaged
I
Line pressure solenoid valve sticking
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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
Maladjustment of throttle position sensor
I
Line pressure solenoid valve sticking
I
Short circuit of line pressure solenoid valve circuit
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Pressure regulator valve or plug sticking
I
Pressure modifier valve sticking
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Pilot valve sticking
SAT786A
Road Test
NHAT0029
DESCRIPTION
NHAT0029S01
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
SAT496G
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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-36 to AT-52 and AT-219 to AT-260.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test (Cont’d)
AT-66
1. CHECK BEFORE ENGINE IS STARTED
=NHAT0029S02
1
CHECK O/D OFF INDICATOR LAMP
1. Park vehicle on flat surface.
2. Move selector lever to P position.
SAT967I
3. Turn ignition switch to OFF position. Wait at least 5 seconds.
4. Turn ignition switch to ON position. (Do not start engine.)
5. Does O/D OFF indicator lamp come on for about 2 seconds?
Yes or No
Yes
©
GO TO 2.
No
©
Stop ROAD TEST. Go to “1. O/D OFF Indicator Lamp Does Not Come On”, AT-219.
2
CHECK O/D OFF INDICATOR LAMP
Does O/D OFF indicator lamp flicker for about 8 seconds?
SAT598J
Yes or No
Yes
©
Perform self-diagnosis and check NG items on the DIAGNOSTIC WORKSHEET, AT-56.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS), AT-50.
No
©
1. Turn ignition switch to OFF position.
2. Perform self-diagnosis and note NG items.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS), AT-50.
3. Go to “2. CHECK AT IDLE”, AT-68.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-67
2. CHECK AT IDLE
NHAT0029S03
1
CHECK ENGINE START
1. Park vehicle on flat surface.
2. Move selector lever to P position.
SAT769B
3. Turn ignition switch to OFF position.
4. Turn ignition switch to START position.
5. Is engine started?
Yes or No
Yes
©
GO TO 2.
No
©
Mark the box on the DIAGNOSTIC WORKSHEET. Go to “2. Engine Cannot Be Started
In P and N Position”, AT-222. Continue ROAD TEST.
2
CHECK ENGINE START
1. Turn ignition switch to ACC position.
2. Move selector lever to D, 1, 2 or R position.
SAT770B
3. Turn ignition switch to START position.
4. Is engine started?
Yes or No
Yes
©
Mark the box on the DIAGNOSTIC WORKSHEET. Mark the box on the DIAGNOSTIC
WORKSHEET. Go to “2. Engine Cannot Be Started In P and N Position”, AT-222. Con-
tinue ROAD TEST.
No
©
GO TO 3.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-68
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