Infiniti F50. Manual — part 42
TROUBLE DIAGNOSIS
AT-53
D
E
F
G
H
I
J
K
L
M
A
B
AT
3.
After warming up A/T, remove the oil pressure detection plug
and install the oil pressure gauge.
CAUTION:
When using the oil pressure gauge, be sure to use the O-
ring attached to the oil pressure detection plug.
4.
Securely engage the parking brake so that the tires do not turn.
5.
Start the engine, then measure the line pressure at both idle and
the stall speed.
CAUTION:
●
Keep the brake pedal pressed all the way down during
measurement.
●
When measuring the line pressure at the stall speed,
refer to
6.
After the measurements are complete, install the oil pressure
detection plug and tighten to the regulation torque below.
CAUTION:
Do not reuse the O-ring.
Line pressure
SCIA0504E
SCIA1224E
:4.8 - 9.8 N·m (0.45 - 0.99 kg-m, 39 - 86 in-lb)
SAT493G
Engine speed
Line pressure
kPa (kg/cm
2
, psi)
R position
D, M positions
At idle speed
392 - 441 (4.0 - 4.5, 57 - 64)
373 - 422 (3.8 - 4.3, 54 - 61)
At stall speed
1,700 - 1,890 (17.3 - 19.3, 247 - 274)
1,310 - 1,500 (13.3 - 15.3, 190 - 218)
AT-54
TROUBLE DIAGNOSIS
Judgement of line pressure test
ROAD TEST
Description
●
The road test inspects overall performance of the A/T and analyzes possible malfunction causes.
●
The road test is carried out in the following three stages.
1.
Check before engine is started. Refer to
.
2.
Check at idle. Refer to
3.
Cruise test
●
Inspect all the items from Part 1 to Part 3. Refer to
●
Before beginning the road test, check the test procedure and inspection items.
●
Test all inspection items until the symptom is uncovered. Diagnose NG items when all road tests are com-
plete.
Judgement Possible
cause
Idle speed
Low for all positions
(P, R, N, D, M)
Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
●
Oil pump wear
●
Pressure regulator valve or plug sticking or spring fatigue
●
Oil strainer
Þ
oil pump
Þ
pressure regulator valve passage oil leak
●
Engine idle speed too low
Only low for a spe-
cific position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High
Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example
●
Accelerator pedal position signal malfunction
●
ATF temperature sensor malfunction
●
Line pressure solenoid malfunction (sticking in “OFF” state, filter clog, cut line)
●
Pressure regulator valve or plug sticking
Stall speed
Oil pressure does
not rise higher than
the oil pressure for
idle.
Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example
●
Accelerator pedal position signal malfunction
●
TCM breakdown
●
Line pressure solenoid malfunction (shorting, sticking in“ ON” state)
●
Pressure regulator valve or plug sticking
●
Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter
the standard posi-
tion.
Possible causes include malfunctions in the pressure supply system and malfunction in the line
pressure adjustment function.
For example
●
Accelerator pedal position signal malfunction
●
Line pressure solenoid malfunction (sticking, filter clog)
●
Pressure regulator valve or plug sticking
●
Pilot valve sticking or pilot filter clogged
Only low for a spe-
cific position
Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
TROUBLE DIAGNOSIS
AT-55
D
E
F
G
H
I
J
K
L
M
A
B
AT
Check Before Engine is Started
ECS00839
1.
CHECK A/T CHECK INDICATOR LAMP
1.
Park vehicle on level surface.
2.
Move selector lever to “P” position.
3.
Turn ignition switch to “OFF” position and wait at least 10 seconds.
4.
Turn ignition switch to “ON” position. (Do not start engine.)
Does A/T CHECK indicator lamp light up for about 2 seconds?
Yes
>> GO TO 2.
No
>> Stop the road test and go to
AT-238, "A/T CHECK Indicator Lamp does not come on"
2.
CHECK A/T CHECK INDICATOR LAMP
Does A/T CHECK indicator lamp flash for about 8 seconds?
Yes
>> For TCM fail-safe mode, carry out self-diagnostics and record all NG items on the diagnostics
.
No
>> 1. Turn ignition switch to “OFF” position.
2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer to
,
.
3. Go to
Check at Idle
ECS0083A
1.
CHECK STARTING THE ENGINE
1.
Park vehicle on level surface.
2.
Move selector lever to “P” or “N” position.
3.
Turn ignition switch to “OFF” position.
4.
Turn ignition switch to “START” position.
Does the engine start?
Yes
>> GO TO 2.
No
>> Stop the road test and go to
AT-239, "Engine Cannot Be Started In “P” or “N” Position"
2.
CHECK STARTING THE ENGINE
1.
Turn ignition switch to “ON” position.
2.
Move selector lever in “D” or “R” position.
3.
Turn ignition switch to “START” position.
Does the engine start in either position?
Yes
>> Stop the road test and go to
AT-239, "Engine Cannot Be Started In “P” or “N” Position"
No
>> GO TO 3.
3.
CHECK “P” POSITION FUNCTIONS
1.
Move selector lever to “P” position.
2.
Turn ignition switch to “OFF” position.
3.
Disengage the parking brake.
4.
Push the vehicle forward or backward.
5.
Engage the parking brake.
When you push the vehicle with disengaging the parking brake, does it move?
Yes
>> Enter a check mark at “Vehicle moves when pushed in “P” position” on the diagnostics worksheet,
then continue the road test.
No
>> GO TO 4.
AT-56
TROUBLE DIAGNOSIS
4.
CHECK “N” POSITION FUNCTIONS
1.
Start the engine.
2.
Move selector lever to “N” position.
3.
Disengage the parking brake.
Does vehicle move forward or backward?
Yes
>> Enter a check mark at “Vehicle moves in “N” position” on the diagnostics worksheet, then continue
the road test.
No
>> GO TO 5.
5.
CHECK SHIFT SHOCK
1.
Engage the brake.
2.
Move selector lever to “D” position.
When the transmission is shifted from “N” to “D”, is there an excessive shock?
Yes
>> Enter a check mark at “Large shock when shifted from N to D” on the diagnostics worksheet, then
continue the road test.
No
>> GO TO 6.
6.
CHECK “R” POSITION FUNCTIONS
1.
Engage the brake.
2.
Move selector lever to “R” position.
3.
Disengage the brake for 4 to 5 seconds.
Does the vehicle creep backward?
Yes
>> GO TO 7.
No
>> Enter a check mark at “Vehicle does not creep backward in R position” on the diagnostics work-
sheet, then continue the road test.
7.
CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle moves forward when the transmission is put into the “D” position.
Does the vehicle move forward in the “D” positions?
Yes
, and
No
>> Enter a check mark at “Vehicle does not move forward in D positions” on the diagnostics work-
sheet, then continue the road test.
Cruise Test - Part 1
ECS0083B
Cruise test Part 1
1.
CHECK STARTING OUT FROM D1
1.
Drive the vehicle for about 10 minutes to warm up the engine oil and A/T fluid.
Appropriate temperature for the A/T fluid: 50 - 80
°
C (122 - 176
°
F)
2.
Park the vehicle on a level surface.
3.
Move selector lever to “P” position.
4.
Start the engine.
5.
Move selector lever to “D” position.
6.
Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-II
Read off the gear positions.
Starts from D1?
Yes
>> GO TO 2.
No
>> Enter a check mark at “Vehicle cannot be started from D1” on the diagnostics worksheet, then
continue the road test.
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