AT-52
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
5. Securely engage the parking brake so that the tires do not turn.
6. Start the engine, then measure the line pressure at both idle andthe stall speed.
CAUTION:
Keep the brake pedal pressed all the way down duringmeasurement.
When measuring the line pressure at the stall speed, refer to "STALL TEST".
7. After the measurements are complete, install the oil pressure detection plug and tighten to the specified torque.
CAUTION:
Do not reuse the O-ring.
Apply ATF to the O-ring.
Line Pressure
Judgement of Line Pressure Test
SCIA7463E
:7.3 N·m (0.74 kg-m, 65 in-lb)SAT493G
Engine speed Line pressure kPa (kg/cm
2, psi)
“R” position “D” and “M” positions
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”,
“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
⇒ 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
:
AT-54
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
2.CHECK STARTING THE ENGINE
1. Turn ignition switch ON. (Do not start engine.)
2. Move selector lever to “D”, “M” or “R” position.
3. Start engine.
Does the engine start in either position?
YES >> Stop the road test and go to AT-170, "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 OFF.
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 AT-171, "In "P" Position, Vehicle Moves When Pushed" on the “Diagnostic
Worksheet Chart”, then continue the road test.
NO >> GO TO 4.
4.CHECK “N” POSITION FUNCTIONS
1. Start 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 AT-172, "In "N" Position, Vehicle Moves" on the “Diagnostic Worksheet
Chart”, 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 AT-173, "Large Shock ("N" to "D" Position)"on the “Diagnostic Worksheet
Chart”, 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 AT-175, "
Vehicle Does Not Creep Backward in "R" Position" on the “Diag-
nostic Worksheet Chart”, then continue the road test.
7.CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle creep forward when the A/T is put into the “D” position.
Does the vehicle creep forward in the
“D” position?
YES >> Go to AT-53, "Road Test".
NO >> Enter a check mark at AT-178, "
Vehicle Does Not Creep Forward in "D" Position"on the “Diagnos-
tic Worksheet Chart”, then continue the road test.
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 ATF. Appropriate temperature for the ATF: 50 to 80 °C (122 to 176 °F)
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AT-56
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
When releasing accelerator pedal from D5, check lock-up from D5 to L/U. Refer to AT-58, "Vehicle Speed at
Which Lock-up Occurs/Releases".
With CONSULT-III
Select “TCC SOLENOID” with the “DATA MONI TOR” mode for “TRANSMISSION”. Refer to AT-84, "
CON-
SULT-III Function (TRANSMISSION)".
Does it lock-up?
YES >> GO TO 7.
NO >> Enter a check mark at AT-190, "
A/T Does Not Lock-up" on the “Diagnostic Worksheet Chart”, then
continue the road test.
7.CHECK LOCK-UP HOLD
Check hold lock-up. With CONSULT-III
Select “TCC SOLENOID” with the “DATA MONI TOR” mode for “TRANSMISSION”. Refer to AT-84, "
CON-
SULT-III Function (TRANSMISSION)".
Does it maintain lock-up status?
YES >> GO TO 8.
NO >> Enter a check mark at AT-192, "
A/T Does Not Hold Lock-up Condition" on the “Diagnostic Work-
sheet Chart”, then continue the road test.
8.CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate. With CONSULT-III
Select “TCC SOLENOID” with the “DATA MONI TOR” mode for “TRANSMISSION”. Refer to AT-84, "
CON-
SULT-III Function (TRANSMISSION)".
Does lock-up cancel?
YES >> GO TO 9.
NO >> Enter a check mark at AT-194, "
Lock-up Is Not Released" on the “Diagnostic Worksheet Chart”,
then continue the road test.
9.CHECK SHIFT-DOWN D5 → D4
Decelerate by pressing lightly on the brake pedal.
With CONSULT-III
Read the gear position and engine speed. Refer to AT-84, "
CONSULT-III Function (TRANSMISSION)".
When the A/T shift-down D
5 → D4, does the engine speed drop smoothly back to idle?
YES >> 1. Stop the vehicle. 2. Go to AT-53, "
Road Test".
NO >> Enter a check mark at AT-194, "
Engine Speed Does Not Return to Idle" on the “Diagnostic Work-
sheet Chart”, then continue the road test. Go to AT-53, "
Road Test".
CRUISE TEST - PART 2
1.CHECK STARTING FROM D1
1. Move selector lever into “D” position.
2. Accelerate at half throttle.
With CONSULT-III
Read the gear position. Refer to AT-84, "
CONSULT-III Function (TRANSMISSION)".
Does it start from D
1?
YES >> GO TO 2.
NO >> Enter a check mark at AT-180, "
Vehicle Cannot Be Started from D1" on the “Diagnostic Worksheet
Chart”, then continue the road test.
2.CHECK SHIFT-UP D1 → D2
Press the accelerator pedal down all the way and check whether or not the A/T shifts up (D1 → D2) at the cor-
rect speed. Refer to AT-58, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
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TROUBLE DIAGNOSISAT-57
< SERVICE INFORMATION >
DE
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G H
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M A
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AT
N
O P
Read the gear position, throttle pos ition and vehicle speed. Refer to AT-84, "CONSULT-III Function (TRANS-
MISSION)".
Does the A/T shift-up D
1 → D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at AT-182, "
A/T Does Not Shift: D1→ D2" on the “Diagnostic Worksheet
Chart”, then continue the road test.
3.CHECK SHIFT-UP D2 → D3
Press the accelerator pedal down all the way and check whether or not the A/T shifts up (D2 → D3) at the cor-
rect speed. Refer to AT-58, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
Read the gear position, throttle pos ition and vehicle speed. Refer to AT-84, "
CONSULT-III Function (TRANS-
MISSION)".
Does the A/T shift-up D
2 → D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at AT-184, "
A/T Does Not Shift: D2→ D3" on the “Diagnostic Worksheet
Chart”, then continue the road test.
4.CHECK SHIFT-UP D3 → D4 AND ENGINE BRAKE
When the A/T changes speed D
3 → D4, return the accelerator pedal.
With CONSULT-III
Read the gear position. Refer to AT-84, "
CONSULT-III Function (TRANSMISSION)".
Does the A/T shift-up D
3 → D4 and apply the engine brake?
YES >> 1. Stop the vehicle. 2. Go to AT-53, "
Road Test".
NO >> Enter a check mark at AT-186, "
A/T Does Not Shift: D3→ D4" on the “Diagnostic Worksheet
Chart”, then continue the road test. Go to AT-53, "
Road Test".
CRUISE TEST - PART 3
1.MANUAL MODE FUNCTION
Move to manual mode from “D” position.
Does it switch to manual mode?
YES >> GO TO 2.
NO >> Continue road test and add check mark to AT-195, "
Cannot Be Changed to Manual Mode" on the
“Diagnostic Worksheet Chart”.
2.CHECK SHIFT-DOWN
During manual mode driving, is downshift from M5 → M4 → M3 → M2 → M1 performed?
With CONSULT-III
Read the gear position. Refer to AT-84, "
CONSULT-III Function (TRANSMISSION)".
Is downshifting correctly performed?
YES >> GO TO 3.
NO >> Enter a check mark at “Vehicle Does No t Shift” at the corresponding position (5th → 4th, 4th →
3rd, 3rd → 2nd, 2nd → 1st) on the “Diagnostic Worksheet Chart”, then continue the road test.
3.CHECK ENGINE BRAKE
Check engine brake.
Does engine braking effectively reduce speed in M1 position?
YES - 1>> With CONSULT-III
1. Stop the vehicle.
2. Perform self-diagnostics.
YES - 2>> Without CONSULT-III
1. Stop the vehicle.
2. Perform self-diagnostics. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
NO >> Enter a check mark at AT-202, "
Vehicle Does Not Decelerate by Engine Brake" on the “Diagnostic
Worksheet Chart”, then continue trouble diagnosis.
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TROUBLE DIAGNOSISAT-59
< SERVICE INFORMATION >
DE
F
G H
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K L
M A
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AT
N
O P
At closed throttle, the accelerator opening is less than 1/8 condition. (Closed throttle position signal: OFF)
At half throttle, the accelerator opening is 4/8 of the full opening.
At closed throttle, the accelerator opening is less than 1/8 condition. (Closed throttle position signal: OFF)
At half throttle, the accelerator opening is 4/8 of the full opening.
Symptom ChartINFOID:0000000001327161
The diagnostics item numbers show the sequence for inspection. Check in order from item 1.
Overhaul and check inside the A/T only if A/T fluid condition is NG. Refer to AT-49, "
Inspections Before Trou-
ble Diagnosis".
Engine model VK45DE
Throttle positionVehicle speed km/h (MPH)
Lock-up ON Lock-up OFF
Closed throttle 66 - 74 (41 - 46) 53 - 61 (33 - 38)
Half throttle 191 - 199 (119 - 124) 145 - 153 (90 - 95)
No. Items Symptom Condition Diagnostic Item Reference
page
1 Shift
Shock Large shock. (“N”
→
“D” position)
Refer to AT- 1 7 3 ,
"Large Shock ("N" to
"D" Position)". ON vehicle 1. Engine idle speed
EC-84
(for
VQ35DE)
or EC-661
(for
VK45DE)
2. Engine speed signal AT- 11 2
3. Accelerator pedal position sensorAT- 1 3 0
4. A/T positionAT- 2 0 7
5. A/T fluid temperature sensorAT- 1 3 2
6. Front brake solenoid valveAT- 1 4 5
7. CAN communication line AT- 9 4
8. A/T fluid level and stateAT- 4 9
9. Line pressure testAT- 4 9
10. Control valve with TCMAT- 2 1 5
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 6 , "
Cross-
Sectional View (2WD Models)", AT- 1 7 , "Cross-Sectional View
(VQ35DE Models for AWD)" or AT- 1 8 , "Cross-Sectional View
(VK45DE Models for AWD)") AT- 2 6 7
2
Shock is too large
when changing D1
→
D
2 or M1 → M2. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. Direct clutch solenoid valveAT- 1 4 7
4. CAN communication line AT- 9 4
5. Engine speed signalAT- 11 2
6. Turbine revolution sensorAT- 1 0 6
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
8. A/T fluid level and state AT- 4 9
9. Control valve with TCMAT- 2 1 5
OFF vehicle 10. Direct clutch AT- 3 0 3
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AT-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
3Shift
Shock Shock is too large
when changing D2
→
D
3 or M2 → M3. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3.High and low reverse clutch solenoid valveAT- 1 4 9
4. CAN communication line AT- 9 4
5. Engine speed signalAT- 11 2
6. Turbine revolution sensorAT- 1 0 6
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
8. A/T fluid level and state AT- 4 9
9. Control valve with TCMAT- 2 1 5
OFF vehicle 10. High and low reverse clutch AT- 3 0 1
4Shock is too large
when changing D3
→
D
4 or M3 → M4. ON vehicle 1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. Input clutch solenoid valveAT- 1 4 3
4. CAN communication line AT- 9 4
5. Engine speed signalAT- 11 2
6. Turbine revolution sensorAT- 1 0 6
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
8. A/T fluid level and state AT- 4 9
9. Control valve with TCMAT- 2 1 5
OFF vehicle 10. Input clutch AT- 2 8 9
5Shock is too large
when changing D4
→
D
5 or M4 → M5. ON vehicle1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. Front brake solenoid valveAT- 1 4 5
4. CAN communication line AT- 9 4
5. Engine speed signalAT- 11 2
6. Turbine revolution sensorAT- 1 0 6
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
8. A/T fluid level and state AT- 4 9
9. Control valve with TCMAT- 2 1 5
OFF vehicle10. Front brake (brake band)
AT- 2 4 911. Input clutchAT- 2 8 9
No. Items Symptom Condition Diagnostic Item Reference
page
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TROUBLE DIAGNOSISAT-61
< SERVICE INFORMATION >
DE
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G H
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M A
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AT
N
O P
6
Shift
Shock Shock is too large for
downshift when accel-
erator pedal is
pressed.
ON vehicle1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. CAN communication line AT- 9 4
4. Engine speed signalAT- 11 2
5. Turbine revolution sensorAT- 1 0 6
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
7. A/T fluid level and state AT- 4 9
8. Control valve with TCMAT- 2 1 5
OFF vehicle9. Front brake (brake band)
AT- 2 4 910. Input clutch AT- 2 8 9
11. High and low reverse clutchAT- 3 0 1
12. Direct clutchAT- 3 0 3
7Shock is too large for
upshift when accelera-
tor pedal is released. ON vehicle1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. Engine speed signal AT- 11 2
4. CAN communication line AT- 9 4
5. Turbine revolution sensorAT- 1 0 6
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
7. A/T fluid level and state AT- 4 9
8. Control valve with TCMAT- 2 1 5
OFF vehicle9. Front brake (brake band)
AT- 2 4 910. Input clutch AT- 2 8 9
11. High and low reverse clutch AT- 3 0 1
12. Direct clutch AT- 3 0 3
8Shock is too large for
lock-up. ON vehicle1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. Engine speed signal AT- 11 2
4. CAN communication line AT- 9 4
5. Turbine revolution sensorAT- 1 0 6
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
7. Torque converter clutch solenoid valve AT- 1 2 4
8. A/T fluid level and state AT- 4 9
9. Control valve with TCMAT- 2 1 5
OFF vehicle 10. Torque converter AT- 2 6 7
No. Items Symptom Condition Diagnostic Item Reference
page
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AT-62
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
9Shift
Shock Shock is too large dur-
ing engine brake. ON vehicle
1. Accelerator pedal position sensor
AT- 1 3 0
2. A/T positionAT- 2 0 7
3. CAN communication line AT- 9 4
4. A/T fluid level and stateAT- 4 9
5. Control valve with TCMAT- 2 1 5
OFF vehicle6. Front brake (brake band)
AT- 2 4 97. Input clutch AT- 2 8 9
8. High and low reverse clutchAT- 3 0 1
9. Direct clutch AT- 3 0 3
10
No Up
Shift Gear does not change
from D
1 to D2 or from
M1to M2.
Refer to AT- 1 8 2 , "
A/T
Does Not Shift: D1→
D2". ON vehicle1. A/T fluid level and state
AT- 4 9
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 3 7
3. Direct clutch solenoid valveAT- 1 4 7
4. Line pressure test AT- 4 9
5. CAN communication lineAT- 9 4
6. Control valve with TCMAT- 2 1 5
OFF vehicle 7. Direct clutch AT- 3 0 3
11Gear does not change
from D
2 to D3 or from
M2 to M3.
Refer to AT- 1 8 4 , "
A/T
Does Not Shift: D2→
D3". ON vehicle1. A/T fluid level and state
AT- 4 9
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
3. High and low reverse clutch solenoid valve AT- 1 4 9
4. Line pressure test AT- 4 9
5. CAN communication lineAT- 9 4
6. Control valve with TCMAT- 2 1 5
OFF vehicle 7. High and low reverse clutch AT- 3 0 1
12Gear does not change
from D
3 to D4 or from
M3 to M4.
Refer to AT- 1 8 6 , "
A/T
Does Not Shift: D3→
D4". ON vehicle1. A/T fluid level and state
AT- 4 9
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
3. Input clutch solenoid valve AT- 1 4 3
4. Front brake solenoid valveAT- 1 4 5
5. Line pressure test AT- 4 9
6. CAN communication lineAT- 9 4
7. Control valve with TCMAT- 2 1 5
OFF vehicle 8. Input clutch AT- 2 8 9
13No Up
Shift Gear does not change
from D
4 to D5 or from
M4 to M5.
Refer to AT- 1 8 8 , "
A/T
Does Not Shift: D4→
D5". ON vehicle1. A/T fluid level and state
AT- 4 9
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 8,
AT- 1 3 7
3. Front brake solenoid valve AT- 1 4 5
4. Direct clutch solenoid valveAT- 1 4 7
5. Turbine revolution sensorAT- 1 0 6
6. Line pressure test AT- 4 9
7. CAN communication lineAT- 9 4
8. Control valve with TCMAT- 2 1 5
OFF vehicle9. Front brake (brake band)
AT- 2 6 710. Input clutchAT- 2 8 9
No. Items Symptom Condition Diagnostic Item Reference
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