2003 NISSAN TEANA accelerator

AT-34
TROUBLE DIAGNOSIS

TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartBCS000ZX
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis for
“CAN COMMUNICATION LINE”. Refer to AT- 1 3 3
.
Fail-safeBCS000ZY
The TCM has an electronic Fail-safe mode. This allows the vehicle to be driven even if a major electrical input/
output device circuit is damaged.
Under Fail-safe, the vehicle always runs in third gear, even with a shift lever position of “1”, “2”, “3” or “D”. The
customer may complain of sluggish or poor acceleration.
Always follow the AT- 3 7 , "
WORK FLOW" .
The SELF-DIAGNOSIS results will be as follows:

The first SELF-DIAGNOSIS will indicate damage to the vehicle speed sensor or the revolution sensor.

During the next SELF-DIAGNOSIS, performed after checking the sensor, no damages will be indicated.
FAIL-SAFE FUNCTION
The following fail-safe functions allow vehicles to be driven even when sensor, switch or solenoid malfunction
occurs.
Vehicle Speed Sensor 1 (Revolution Sensor)
Vehicle speed sensor 2 signal is input from combination meter.
Accelerator Pedal Position Sensor Signal
TCM controls the throttle opening angle to a predetermined fixed position to enable driving if a malfunctioning
signal is input to TCM.
Park/Neutral Position (PNP) Switch
When the multiple PNP switch signals are input to TCM, the priority of selector lever position becomes “D”·“3”,
“N”, “R”, “2” and “1” in order by internal TCM determination.
The use of 4th gear is inhibited until normal operation resumes. Because the hydraulic circuit of the control
valve is switched by manual valve according to the selector lever position, however, actual operating condition
of vehicle becomes as follows.
Priority Detected items
1 CAN communication line
2 Except above
Actual lever position PNP switch input signal Running status
“P” “P” position and other position signals P
“R” “R” position and other position signals R
“N” “N” position and other position signals N
“D”·“3” “D” position and other position signals D
1 ⇔D2 ⇔D3
“2”“2” position and other position signals (Except “1” position) 21 ⇔22 ⇔23
“2” position and “1” position signals 21 ⇔22
“1”“1” position and other position signals (Except “2” position) 11 ⇔12 ⇔13
“1” position and “2” position signals 11 ⇔12

AT-44
TROUBLE DIAGNOSIS

6. Accelerate to wide open throttle gradually while applying foot
brake.
7. Quickly note the engine stall revolution and immediately release
throttle.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
8. Move selector lever to “N” position.
9. Cool off ATF.
CAUTION:
Run engine at idle for at leas 1 minute.
10. Repeat steps 6 through 9 with selector lever in “3”, “2”, “1” and
“R” positions.
Judgement of Stall Test
The test result and possible damaged components relating to each result are shown in the illustrations on next
page.
In order to pinpoint the possible damaged components, refer to AT- 3 7 , "
Work Flow Chart" .
NOTE:
Stall revolution is too high in “D”, “3”, “2”, or “1” position:

Slippage occurs in 1st gear but not in 2nd and 3rd gears. ..... Low one-way clutch slippage

Slippage occurs in the following gears:
1st through 3rd gears in “D” position and engine brake functions with selector lever set to “3” position.
1st and 2nd gears in “2” position and engine brake functions with accelerator pedal released (fully closed
throttle)...... Forward clutch or forward one-way clutch slippage
Stall revolution is too high in “R” position:

Engine brake does not function in “1” position. ..... Low & reverse brake slippage

Engine brake functions in “1” position. ..... Reverse clutch slippage
Stall revolution within specifications:

Vehicle does not achieve speed of more than 80 km/h (50 MPH). ..... One-way clutch seizure in torque
converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnormally.

Slippage occurs in 3rd and 4th gears in “D” position. ..... High clutch slippage

Slippage occurs in 2nd and 4th gear in “D” position. ..... Brake band slippage

Engine brake does not function in 2nd and 3rd gears in “D” position with 3rd position switch set to ON, 2nd
gear in “2” position, and 1st gear in “1” position. ..... Overrun clutch slippage
Stall revolution less than specifications:

Poor acceleration during starts. ..... One-way clutch seizure in torque converterStall revolution
For QR20DE engine models:
2,400 - 2,850 rpm
For VQ23DE engine models:
2,400 - 2,900 rpm
SAT514G
SCIA5704E

TROUBLE DIAGNOSIS
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5. Start engine and measure line pressure at idle and stall speed.
CAUTION:

Keep the brake pedal pressed all the way down during
measurement.

When measuring line pressure at stall speed, refer to AT-
43, "STALL TEST" .
Line Pressure
Judgement of Line Pressure Test
SAT493G
Engine speed rpmLine pressure kPa (bar, kg/cm2 , psi)
“D”, “3”, “2” and “1” positions “R” position
Idle 500 (5.00, 5.1, 73) 778 (7.78, 7.9, 113)
Stall 1,233 (12.33, 12.6, 179) 1,918 (19.18, 19.6, 278)
Judgement Suspected parts
At idleLine pressure is low in all positions.

Oil pump wear

Control piston damage

Pressure regulator valve or plug sticking

Spring for pressure regulator valve damaged

Fluid pressure leakage between oil strainer and pressure regulator valve

Clogged strainer
Line pressure is low in particular posi-
tion.

Fluid pressure leakage between manual valve and particular clutch

For example, line pressure is:
− Low in “R” and “1” positions, but
− Normal in “D”, “3” and “2” positions.
Therefore, fluid leakage exists at or around low and reverse brake circuit.
Refer to AT-18, "
CLUTCH AND BAND CHART" .
Line pressure is high.

Accelerator pedal position signal malfunction

A/T fluid temperature sensor damaged

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure modifier valve sticking

Pressure regulator valve or plug sticking

Open in dropping resistor circuit
At stall
speedLine pressure is low.

Accelerator pedal position signal malfunction

Line pressure solenoid valve sticking

Short circuit of line pressure solenoid valve circuit

Pressure regulator valve or plug sticking

Pressure modifier valve sticking

Pilot valve sticking

AT-50
TROUBLE DIAGNOSIS

Cruise Test — Part 1BCS00106
1. CHECK STARTING GEAR (D1 ) POSITION
1. Drive vehicle for approximately 10 minutes to warm engine oil and ATF up to operating temperature.
2. Park vehicle on flat surface.
3. Move selector lever to “P” position.
4. Start engine.
5. Move selector lever to “D” position.
6. Accelerate vehicle by constantly depressing accelerator pedal half-way.
Read gear position. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does vehicle start from D
1 ?
YES >> GO TO 2.
NO >>

Mark the box AT- 1 8 2 , "Vehicle Cannot Be Started From D1" on the AT- 3 8 , "DIAGNOSTIC
WORKSHEET" .

Continue “Road Test”.
2. CHECK SHIFT-UP (D1 TO D2 )
Check shift-up (D
1 to D2 ).
Specified speed when shifting from D
1 to D2 (Throttle position: half throttle). Refer to AT- 5 4 , "Vehicle Speed
Which Gear Shifting Occurs" .
Read gear position, throttle opening and vehicle speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
1 to D2 at the specified speed?
YES >> GO TO 3.
NO >>

Mark the box AT- 1 8 4 , "A/T Does Not Shift: D1 → D2 or Does Not Kickdown: D4 → D2" on the
AT- 3 8 , "
DIAGNOSTIC WORKSHEET" .

Continue “Road Test”.
3. CHECK SHIFT-UP (D2 TO D3 )
Check shift-up (D
2 to D3 ).
Specified speed when shifting from D
2 to D3 (Throttle position: half throttle). Refer to AT- 5 4 , "Vehicle Speed
Which Gear Shifting Occurs" .
Read gear position, throttle opening and vehicle speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
2 to D3 at the specified speed?
YES >> GO TO 4.
NO >>

Mark the box AT- 1 8 6 , "A/T Does Not Shift: D2 → D3" on the AT- 3 8 , "DIAGNOSTIC WORK-
SHEET" .

Continue “Road Test”.
4. CHECK SHIFT-UP (D3 TO D4 )
Check shift-up (D
3 to D4 ).
Specified speed when shifting from D
3 to D4 (Throttle position: half throttle). Refer to AT- 5 4 , "Vehicle Speed
Which Gear Shifting Occurs" .
Read gear position, throttle opening and vehicle speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
3 to D4 at the specified speed?
YES >> GO TO 5.
NO >>

Mark the box AT- 1 8 8 , "A/T Does Not Shift: D3 → D4" on the AT- 3 8 , "DIAGNOSTIC WORK-
SHEET" .

Continue “Road Test”. ATF operating temperature: 50 - 80°C (122 - 176°F)

TROUBLE DIAGNOSIS
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5. CHECK LOCK-UP (D4 TO D4 L/U)
Check lock-up (D
4 to D4 L/U).
Specified speed when lock-up occurs (Throttle position: half throttle). Refer to AT- 5 4 , "
Vehicle Speed at When
Lock-up Occurs/Releases" .
Read vehicle speed, throttle opening when lock-up duty becomes 94%. Refer to AT- 7 0 , "
DATA
MONITOR MODE" .
Does A/T perform lock-up at specified speed?
YES >> GO TO 6.
NO >>

Mark the box AT- 1 9 1 , "A/T Does Not Perform Lock-up" on the AT- 3 8 , "DIAGNOSTIC WORK-
SHEET" .

Continue “Road Test”.
6. CHECK LOCK-UP HOLD
Check lock-up hold.
When lock-up duty becomes 94%. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T hold lock-up condition for more than 30 seconds?
YES >> GO TO 7.
NO >>

Mark the box AT- 1 9 3 , "A/T Does Not Hold Lock-up Condition" on the AT- 3 8 , "DIAGNOSTIC
WORKSHEET" .

Continue “Road Test”.
7. CHECK SHIFT-DOWN (D4 L/U TO D4 )
Release accelerator pedal.
When lock-up duty becomes 4%. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Is lock-up released when accelerator pedal is released?
YES >> GO TO 8.
NO >>

Mark the box AT- 1 9 5 , "Lock-up Is Not Released" on the AT- 3 8 , "DIAGNOSTIC WORKSHEET"
.

Continue “Road Test”.
8. CHECK SHIFT-DOWN (D4 TO D3 )
Decelerate vehicle by applying foot brake lightly.
Read gear position and engine speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does engine speed return to idle smoothly when A/T is shifted from D
4 to D3 ?
YES >> 1. Stop vehicle.
2. Go to AT- 5 1 , "
Cruise Test — Part 2" .
NO >>

Mark the box AT- 1 9 5 , "Engine Speed Does Not Return To Idle (Light Braking D4 → D3 )" on the
AT- 3 8 , "
DIAGNOSTIC WORKSHEET" .

Continue “Road Test”.
Cruise Test — Part 2BCS00107
1. CHECK STARTING GEAR (D1 ) POSITION
1. Move selector lever to “D” position.
2. Accelerate vehicle by half throttle again.
Read gear position. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does vehicle start from D
1 ?
YES >> GO TO 2.
NO >>

Mark the box AT- 1 8 2 , "Vehicle Cannot Be Started From D1" on the AT- 3 8 , "DIAGNOSTIC
WORKSHEET" .

Continue “Road Test”.

AT-52
TROUBLE DIAGNOSIS

2. CHECK SHIFT-UP AND SHIFT-DOWN (D3 TO D4 TO D2 )
1. Accelerate vehicle to 80 km/h (50 MPH).
2. Release accelerator pedal and then quickly depress it fully.
Read gear position and throttle opening. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
4 to D2 as soon as accelerator pedal is depressed fully?
YES >> GO TO 3.
NO >>

Mark the box AT- 1 8 4 , "A/T Does Not Shift: D1 → D2 or Does Not Kickdown: D4 → D2" on the
AT- 3 8 , "
DIAGNOSTIC WORKSHEET" .

Continue “Road Test”.
3. CHECK SHIFT-UP (D2 TO D3 )
Check shift-up (D
2 to D3 )
Specified speed when shifting from D
2 to D3 (Throttle position: full throttle). Refer to AT- 5 4 , "Vehicle Speed
Which Gear Shifting Occurs" .
Read gear position, throttle opening and vehicle speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
2 to D3 at the specified speed?
YES >> GO TO 4.
NO >>

Mark the box AT- 1 8 6 , "A/T Does Not Shift: D2 → D3" on the AT- 3 8 , "DIAGNOSTIC WORK-
SHEET" .

Continue “Road Test”.
4. CHECK SHIFT-UP (D3 TO D4 ) AND ENGINE BRAKE
Release accelerator pedal after shifting from D
2 to D3 .
Read gear position, throttle opening and vehicle speed. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
3 to D4 and does vehicle decelerate by engine brake?
YES >> 1. Stop vehicle.
2. Go to AT- 5 2 , "
Cruise Test — Part 3" .
NO >>

Mark the box AT- 1 8 8 , "A/T Does Not Shift: D3 → D4" on the AT- 3 8 , "DIAGNOSTIC WORK-
SHEET" .

Continue “Road Test”.
Cruise Test — Part 3BCS00108
1. CHECK SHIFT-DOWN (D4 TO 33 )
1. More selector lever to “D” position.
2. Accelerate vehicle using half-throttle to D
4 .
3. Release accelerator pedal.
4. Move gear selector lever from “D” position to “3” position while driving in D
4 .
Read gear position. Refer to AT- 7 0 , "
DATA MONITOR MODE" .
Does A/T shift from D
4 to 33 ?
YES >> GO TO 2.
NO >>

Mark the box AT- 1 9 7 , "A/T Does Not Shift: D4 → 33 , When A/T Selector Lever “D” → “3”" on
the AT- 3 8 , "
DIAGNOSTIC WORKSHEET" .

Continue “Road Test”.

AT-54
TROUBLE DIAGNOSIS

Vehicle Speed Which Gear Shifting OccursBCS00109
FOR QR20DE ENGINE MODELS

At half throttle, the accelerator opening is 4/8 of the full opening.
FOR VQ23DE ENGINE MODELS

At half throttle, the accelerator opening is 4/8 of the full opening.
Vehicle Speed at When Lock-up Occurs/ReleasesBCS0010A
FOR QR20DE ENGINE MODELS
NOTE:

Perform lock-up inspection after warming up engine.

Lock-up vehicle speed may vary depending on the driving conditions and circumstances.
FOR VQ23DE ENGINE MODELS
NOTE:

Perform lock-up inspection after warming up engine.

Lock-up vehicle speed may vary depending on the driving conditions and circumstances. Throttle positionVehicle speed km/h (MPH)
D
1 → D2D2 → D3D3 → D4D4 → D3D3 → D2D2 → D1
Full throttle51 - 59
(32 - 37)96 - 104
(60 - 65)151 - 159
(94 - 99)147 - 155
(91 - 96)86 - 94
(53 - 58)40 - 48
(25 - 30)
Half throttle33 - 41
(21 - 25)62 - 70
(39 - 43)121 - 129
(75 - 80)77 - 85
(48 - 53)37 - 45
(23 - 28)5 - 13
(3 - 8)
Throttle positionVehicle speed km/h (MPH)
D1 → D2D2 → D3D3 → D4D4 → D3D3 → D2D2 → D1
Full throttle52 - 60
(32 - 37)97 - 105
(60 - 65)153 - 161
(95 - 100)149 - 157
(93 - 98)87 - 95
(54 - 59)41 - 49
(25 - 30)
Half throttle30 - 38
(19 - 24)58 - 66
(36 - 41)116 - 124
(72 - 77)69 - 77
(43 - 48)34 - 42
(21 - 26)5 - 13
(3 - 8)
Throttle position Selector lever positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
2.0/8 D position 86 - 94 (53 - 58) 61 - 69 (38 - 43)
3rd position 86 - 94 (53 - 58) 83 - 91 (52 - 57)
Throttle position Selector lever positionVehicle speed km/h (MPH)
Lock-up “ON” Lock-up “OFF”
2.0/8 D position 86 - 94 (53 - 58) 51 - 59 (32 - 37)
3rd position 86 - 94 (53 - 58) 83 - 91 (52 - 57)

TROUBLE DIAGNOSIS
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Symptom ChartBCS0010B
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Items Symptom Condition Diagnostic item Reference page
No Lock-up
Engagement/
TCC InoperativeTorque converter
is not locked up.ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
3. PNP switchAT- 1 6 1
4. Engine speed signalAT- 11 6
5. A/T fluid temperature sensorAT- 11 0
6. Line pressure testAT- 4 6
7. Torque converter clutch solenoid valveAT- 1 0 5
8. Control valve assemblyAT- 2 2 5
OFF vehicle 9. Torque converterAT- 2 5 5
Torque converter
clutch piston slip.ON vehicle1. A/T fluid levelAT- 1 4
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Line pressure testAT- 4 6
4. Torque converter clutch solenoid valveAT- 1 0 5
5. Line pressure solenoid valveAT- 1 2 6
6. Control valve assemblyAT- 2 2 5
OFF vehicle 7. Torque converterAT- 2 5 5
Lock-up point is
extremely high or
low.ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTRAT- 8 0, AT- 8 6
3. Torque converter clutch solenoid valveAT- 1 0 5
4. Control valve assemblyAT- 2 2 5
Shift ShockSharp shock in
shifting from “N”
to “D” position.ON vehicle1. Engine idle speed
EC-45
*1, EC-387*2
2. Accelerator pedal position sensor
EC-272*1, EC-652*2
3. Line pressure testAT- 4 6
4. A/T fluid temperature sensorAT- 11 0
5. Engine speed signalAT- 11 6
6. Line pressure solenoid valveAT- 1 2 6
7. Control valve assemblyAT- 2 2 5
8. N-D accumulatorAT- 2 2 5
OFF vehicle 9. Forward clutchAT- 3 0 7
Too sharp a
shock in change
from D
1 to D2 .ON vehicle1. Accelerator pedal position sensor
EC-272
*1, EC-652*2
2. Line pressure testAT- 4 6
3. Accumulator servo releaseAT- 2 2 5
4. Control valve assemblyAT- 2 2 5
5. A/T fluid temperature sensorAT- 11 0
OFF vehicle 6. Brake bandAT- 3 2 9