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Infiniti QX56 (JA60). Manual - part 964

TM-158

< ON-VEHICLE MAINTENANCE >

LINE PRESSURE TEST

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

TM-155, "Inspection and Judgment"

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

Judgement of Line Pressure Test

Oil pressure detection
plug

:7.3 N·m (0.74 kg-m, 65 in-lb)

SAT493G

Engine speed

Line pressure [kPa (kg/cm

, psi)]

“R” position

“D” position

At idle speed

425 - 465 (4.3 - 4.7, 62 - 67)

379 - 428 (3.9 - 4.4, 55 - 62)

At stall speed

1,605 - 1,950 (16.4 - 19.9, 233 - 283)

1,310 - 1,500 (13.4 - 15.3, 190 - 218)

Judgement Possible

cause

Idle speed

Low for all positions
(P, R, N, D)

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

⇒ oil pump ⇒ 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 pressure adjustment function.
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 pres-
sure 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.

ROAD TEST

TM-159

< ON-VEHICLE MAINTENANCE >

ROAD TEST

Description

INFOID:0000000005148728

ROAD TEST

• 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

TM-159

2. Check at idle. Refer to

TM-159

3. Cruise test

• Inspect all the items from Part 1 to Part 3. Refer to

TM-160

TM-162

• 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.

Check Before Engine Is Started

INFOID:0000000005148729

CHECK AT 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 AT CHECK indicator lamp light up for about 2 seconds?

YES

>> 1. Turn ignition switch to “OFF” position.

2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer to

TM-32, "CONSULT-III Function (TRANSMISSION)"

3. Go to

TM-159, "Check At Idle"

>> Stop the road test and go to

TM-121, "Symptom Table"

Check At Idle

INFOID:0000000005148730

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.

>> Stop the road test and go to

TM-121, "Symptom Table"

CHECK STARTING THE ENGINE

1. Turn ignition switch to “ON” position.

2. Move selector lever in “D”,“4”, “3”, “2”, “1” 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

TM-121, "Symptom Table"

>> GO TO 3.

CHECK “P” POSITION FUNCTIONS

1. Move selector lever to “P” position.

2. Turn ignition switch to “OFF” position.

3. Release 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?

TM-160

< ON-VEHICLE MAINTENANCE >

ROAD TEST

YES

>> Record the malfunction, GO TO 4.

>> GO TO 4.

CHECK “N” POSITION FUNCTIONS

1. Start the engine.

2. Move selector lever to “N” position.

3. Release the parking brake.
Does vehicle move forward or backward?

YES

>> Record the malfunction, GO TO 5.

>> GO TO 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

>> Record the malfunction, GO TO 6.

>> GO TO 6.

CHECK “R” POSITION FUNCTIONS

1. Engage the brake.

2. Move selector lever to “R” position.

3. Release the brake for 4 to 5 seconds.
Does the vehicle creep backward?

YES

>> GO TO 7.

>> Record the malfunction, GO TO 7.

CHECK “D” POSITION FUNCTIONS

Inspect whether the vehicle creeps forward when the transmission is put into the “D” position.
Does the vehicle creep forward in the “D” positions?

YES

>> Go to

TM-160, "Cruise Test - Part 1"

>> Record the malfunction and go to

TM-160, "Cruise Test - Part 1"

Cruise Test - Part 1

INFOID:0000000005148731

CHECK STARTING OUT FROM D1

1. Drive the vehicle for about 10 minutes to warm up the engine oil and ATF.

Appropriate temperature for the ATF: 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-III

Read off the gear positions.
Starts from D1?

YES

>> GO TO 2.

>> Record the malfunction, GO TO 2.

CHECK SHIFT-UP D1

→ D2

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D1

→ D2) at the appropri-

ate speed.

• Refer to

TM-265, "Vehicle Speed at Which Gear Shifting Occurs"

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D1

→ D2 at the correct speed?

YES

>> GO TO 3.

>> Record the malfunction, GO TO 3.

ROAD TEST

TM-161

< ON-VEHICLE MAINTENANCE >

CHECK SHIFT-UP D2

→ D3

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D2

→ D3) at the appropri-

ate speed.

• Refer to

TM-265, "Vehicle Speed at Which Gear Shifting Occurs"

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D2

→ D3 at the correct speed?

YES

>> GO TO 4.

>> Record the malfunction, GO TO 4.

CHECK SHIFT-UP D3

→ D4

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D3

→ D4) at the appropri-

ate speed.

• Refer to

TM-265, "Vehicle Speed at Which Gear Shifting Occurs"

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D3

→ D4 at the correct speed?

YES

>> GO TO 5.

>> Record the malfunction, GO TO 5.

CHECK SHIFT-UP D4

→ D5

Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D4

→ D5) at the appropri-

ate speed.

• Refer to

TM-265, "Vehicle Speed at Which Gear Shifting Occurs"

With CONSULT-III

Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D4

→ D5 at the correct speed?

YES

>> GO TO 6.

>> Record the malfunction, GO TO 6.

CHECK LOCK-UP

When releasing accelerator pedal from D5, check lock-up from D5 to L/U.

• Refer to

TM-265, "Vehicle Speed at Which Gear Shifting Occurs"

With CONSULT-III

Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T.
Does it lock-up?

YES

>> GO TO 7.

>> Record the malfunction, GO TO 7.

CHECK LOCK-UP HOLD

Does it maintain lock-up status?

YES

>> GO TO 8.

>> Record the malfunction, GO TO 8.

CHECK LOCK-UP RELEASE

Check lock-up cancellation by depressing brake pedal lightly to decelerate.

With CONSULT-III

Select “TCC SOLENOID 0.00A” with the “MAIN SIGNAL” mode for A/T.
Does lock-up cancel?

YES

>> GO TO 9.

>> Record the malfunction, GO TO 9.

CHECK SHIFT-DOWN D5

→ D4

Decelerate by pressing lightly on the brake pedal.

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