Infiniti I35 (A33). Manual — part 18
JUDGEMENT OF LINE PRESSURE TEST
NHAT0028S03
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
Fluid pressure leakage between oil strainer and pres-
sure regulator valve
I
Clogged strainer
Line pressure is low in particular position.
I
Fluid pressure leakage between manual valve and
particular clutch
I
For example, line pressure is:
− Low in R and 1st positions, but
− Normal in D and 2nd positions.
Therefore, fluid leakage exists at or around low and
reverse brake circuit.
Refer to “CLUTCH AND BAND CHART”, AT-20.
Line pressure is high.
I
Maladjustment of accelerator pedal position sensor
(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
Maladjustment of accelerator pedal position sensor
(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
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
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-36 to AT-55 and AT-220 to AT-265.
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Line Pressure Test (Cont’d)
AT-69
1. CHECK BEFORE ENGINE IS STARTED
=NHAT0029S02
1
CHECK A/T CHECK INDICATOR LAMP
1. Park vehicle on flat surface.
2. Move selector lever to P position.
SAT491K
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 A/T CHECK indicator lamp come on for about 2 seconds?
Yes or No
Yes
©
GO TO 2.
No
©
Stop ROAD TEST. Go to “A/T CHECK Indicator Lamp Does Not Come On”, AT-222.
2
CHECK A/T CHECK INDICATOR LAMP
Does A/T CHECK indicator lamp flicker for about 8 seconds?
SAT604K
Yes or No
Yes
©
TCM is under Fail-safe mode. Perform self-diagnosis and check NG items on the DIAG-
NOSTIC WORKSHEET, AT-59. Refer to SELF-DIAGNOSTIC PROCEDURE (WITH
CONSULT-II), AT-41, or TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS), AT-52.
No
©
1. Turn ignition switch to OFF position.
2. Perform self-diagnosis and note NG items.
Refer to SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II), AT-41, TCM SELF-
DIAGNOSTIC PROCEDURE (NO TOOLS), AT-52.
3. Go to “2. CHECK AT IDLE”, AT-71.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-70
2. CHECK AT IDLE
NHAT0029S03
1
CHECK ENGINE START
1. Park vehicle on flat surface.
2. Move selector lever to P or N position.
SAT502K
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
©
Stop ROAD TEST. Mark the box on the DIAGNOSTIC WORKSHEET. Go to “Engine
Cannot Be Started In P and N Position”, AT-224.
2
CHECK ENGINE START
1. Turn ignition switch to ON position.
2. Move selector lever to D, 1st, 2nd or R position.
SAT503K
3. Turn ignition switch to START position.
4. Is engine started?
Yes or No
Yes
©
Stop ROAD TEST. Mark the box on the DIAGNOSTIC WORKSHEET. Go to “Engine
Cannot Be Started In P and N Position”, AT-224.
No
©
GO TO 3.
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-71
3
CHECK VEHICLE MOVE
1. Move selector lever to P position.
SAT491K
2. Turn ignition switch to OFF position.
3. Release parking brake.
4. Push vehicle forward or backward.
SAT796A
5. Does vehicle move when it is pushed forward or backward?
6. Apply parking brake.
Yes or No
Yes
©
Mark the box of “In P Position, Vehicle Moves Forward Or Backward When Pushed” on
the DIAGNOSTIC WORKSHEET. Continue ROAD TEST.
No
©
GO TO 4.
4
CHECK VEHICLE MOVE
1. Start engine.
2. Move selector lever to N position.
SAT498K
3. Release parking brake.
4. Does vehicle move forward or backward?
Yes or No
Yes
©
Mark the box of “In N Position, Vehicle Moves” on the DIAGNOSTIC WORKSHEET.
Continue ROAD TEST.
No
©
GO TO 5.
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-72
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