engine NISSAN TEANA 2008 Service Manual

P1777 STEP MOTOR
TM-261
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P1777 STEP MOTOR
DescriptionINFOID:0000000003806471
The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the
flow of line pressure to primary pulley is changed and pulley ratio is controlled.
DTC LogicINFOID:0000000003806472
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch
OFF. Then wait at least 10 seconds before performing the next test.
Perform the following procedure to confirm the malfunction is eliminated after the repair.
1.CHECK DTC DETECTION
With CONSULT-III
1. Start engine.
2. Drive vehicle for at least 5 consecutive seconds.
3. Select “Self Diagnostic Results” mode for “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P1777 STEP MOTR CIRC” detected?
YES >> Go to TM-261, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003806473
1.CHECK STEP MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector.
3. Check resistance between TCM vehicle side harness connector terminals.
4. Check resistance between TCM vehicle side harness connector terminals and ground.
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P1777 STEP MOTR CIRCEach coil of the step motor is
not energized properly due to
an open or a short. Step motor
 Harness or connectors
(Step motor circuit is open or
shorted.)
TCM vehicle side harness connector
Resistance (Approx.)
Connector Terminal
F2327 28
30.0 Ω
29 30

TM-264
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P1778 STEP MOTOR - FUNCTION
P1778 STEP MOTOR - FUNCTION
DescriptionINFOID:0000000003806475
 The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result,
the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
 This diagnosis item is detected when the electrical system is OK, but the mechanical system is NG.
 This diagnosis item is detected when the state of the changing of the speed mechanism in the unit does not
operate normally.
DTC LogicINFOID:0000000003806476
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
 Always drive vehicle at a safe speed.
 Before starting “DTC CONFIRMATION PROCEDURE”, confirm “Hi” or “Mid” or “Low” fixation by
“PRI SPEED” and “VEHICLE SPEED” on “Data Monitor”.
 If hi-geared fixation occurred, go to TM-264, "
Diagnosis Procedure".
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
Perform the following procedure to confirm the malfunction is eliminated after the repair.
1.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Data Monitor” mode for “TRANSMISSION”.
3. Make sure that output voltage of CVT fluid temperature sensor is within the range specified below.
4. Start engine and maintain the following conditions for at least 30 consecutive seconds.
With GST.
Follow the procedure “With CONSULT-III”.
Is
“P1778 STEP MOTR/FNC” detected?
YES >> Go to TM-264, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003806477
1.CHECK STEP MOTOR SYSTEM
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P1778 STEP MOTR/FNCThere is a big difference be-
tween the number of steps for
the stepping motor and for the
actual gear ratio.Step motor
ATF TEMP SEN : 1.0 – 2.0 V
If it is out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the
voltage (cool down the fluid)
Start test from 0 km/h (0 MPH)
Constant acceleration : Keep 30 sec or more
VEHICLE SPEED : 10 km/h (6 MPH) or more
ACC PEDAL OPEN : More than 1.0/8
RANGE : “D” position
ENG SPEED : 450 rpm or more

TM-266
< COMPONENT DIAGNOSIS >[CVT: RE0F10A]
SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
DescriptionINFOID:0000000003806478
TCM sends position indicator signals to combination meter via CAN communication line.
Component Function CheckINFOID:0000000003806479
1.CHECK SHIFT POSITION INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1. Start engine.
2. Check that correct selector lever position (“P”, “N”, “R”, “D” or “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to TM-266, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003806480
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “RANGE” on “Data Monitor” mode for “TRANSMISSION” and read out the value.
3. Check that correct selector lever position (“P”, “N”, “R”, “D” or “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES >> INSPECTION END
NO-1 [The actual gear position does not change, or shifting into the manual mode is not possible (no gear
shifting in the manual mode possible). Or the shift position indicator is not indicated.]>>Check the following.
 Check sport mode switch. Refer to TM-272, "
Description".
 Check CVT main system (Fail-safe function actuated).
- Check “Self Diagnostic Results” mode for “TRANSMISSION”.
NO-2 (The actual gear position changes, but the shift position indicator is not indicated.)>>
 Check “Self Diagnostic Results” mode for “TRANSMISSION”.
NO-3 (The actual gear position and the indication on the shift position indicator do not coincide.)>>
 Check “Self Diagnostic Results” mode for “TRANSMISSION”.
NO-4 (Only a specific position or positions is/are not indicated on the shift position indicator.)>>
 Check the combination meter. Refer to MWI-33, "
CONSULT-III Function (METER/M&A)".

TCM
TM-275
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ECU DIAGNOSIS
TCM
Reference ValueINFOID:0000000003806487
VALUES ON THE DIAGNOSIS TOOL
Item name Condition Display value (Approx.)
VSP SENSOR During drivingApproximately matches the speedometer
reading.
ESTM VSP SIG During drivingApproximately matches the speedometer
reading.
PRI SPEED SEN During driving (lock-up ON) Approximately matches the engine speed.
ENG SPEED SIG Engine running Closely matches the tachometer reading.
SEC HYDR SEN “N” position idle 1.0 V
PRI HYDR SEN “N” position idle 0.7 – 3.5 V
ATF TEMP SEN*When CVT fluid temperature is 20°C (68°F) 2.0 V
When CVT fluid temperature is 80°C (176°F) 1.0 V
VIGN SEN Ignition switch: ON Battery voltage
VEHICLE SPEED During drivingApproximately matches the speedometer
reading.
PRI SPEED During driving (lock-up ON) Approximately matches the engine speed.
SEC SPEED During driving45 X Approximately matches the speedom-
eter reading.
ENG SPEED Engine running Closely matches the tachometer reading.
GEAR RATIO During driving 2.34 – 0.39
ACC PEDAL OPENReleased accelerator pedal - Fully depressed acceler-
ator pedal0.0/8 – 8.0/8
SEC PRESS “N” position idle 1.3 MPa
STM STEP During driving−20 step – 190 step
ISOLT1Lock-up “OFF” 0.0 A
Lock-up “ON” 0.7 A
ISOLT2Release foot from the accelerator pedal. 0.8 A
Press the accelerator pedal all the way down. 0.0 A
ISOLT3 Secondary pressure low - Secondary pressure high 0.8 – 0.0 A
SOLMON1Lock-up “OFF” 0.0 A
Lock-up “ON” 0.7 A
SOLMON2“N” position idle 0.8 A
When stalled 0.3 – 0.6 A
SOLMON3“N” position idle 0.6 – 0.7 A
When stalled 0.4 – 0.6 A
P POSITION SWSelector lever in “P” position On
Other than the above position. Off
R POSITION SWSelector lever in “R” position On
Other than the above position. Off
N POSITION SWSelector lever in “N“ position On
Other than the above position. Off

TM-284
< ECU DIAGNOSIS >[CVT: RE0F10A]
TCM
Output Speed Sensor (Secondary Speed Sensor)
The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from the
output speed sensor (secondary speed sensor) to the TCM. The manual mode is inhibited, and the transaxle
is put in “D”.
Input Speed Sensor (Primary Speed Sensor)
The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed) when
an unexpected signal is sent from the input speed sensor (primary speed sensor) to the TCM. The manual
mode is inhibited, and the transaxle is put in “D”.
PNP Switch
If an unexpected signal is sent from the PNP switch to the TCM, the transaxle is put in “D”.
CVT Fluid Temperature Sensor
If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use before
receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed under 5000
rpm.
Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)
 If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor) to
the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the non-
standard condition occurs is used to control line pressure.
 If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, secondary
pressure feedback control stops, but line pressure is controlled normally.
Pressure Control Solenoid A (Line Pressure Solenoid valve)
If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid A (line pressure
solenoid valve) is turned OFF to achieve the maximum fluid pressure.
Pressure Control Solenoid B (Secondary Pressure Solenoid valve)
If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid B (secondary pres-
sure solenoid valve) is turned OFF to achieve the maximum fluid pressure.
Torque Converter Clutch Solenoid valve
If an unexpected signal is sent from the solenoid to the TCM, the torque converter clutch solenoid valve is
turned OFF to cancel the lock-up.
Step Motor
If an unexpected signal is sent from the step motor to the TCM, the step motor coil phases “A” through “D” are
all turned OFF to hold the gear ratio used just before the non-standard condition occurred.
CVT Lock-up Select Solenoid valve
If an unexpected signal is sent from the solenoid to the TCM, the CVT lock-up select solenoid valve is turned
OFF to cancel the lock-up.
TCM Power Supply (Memory Back-up)
Transaxle assembly is protected by limiting the engine torque when the memory back-up power supply (for
controlling) from the battery is not supplied to TCM. Normal status is restored when turning the ignition switch
OFF to ON after the normal power supply.
DTC Inspection Priority ChartINFOID:0000000003806490
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer to TM-208
.
DTC IndexINFOID:0000000003806491
NOTE:
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

TCM
TM-285
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If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer to TM-208
.
*1: These numbers are prescribed by ISO 15031-6.
*2: Refer to TM-202, "
Diagnosis Description". DTC
*1
Items
(CONSULT-III screen terms)Reference MI*2, “ENGINE” with
CONSULT-III or
GSTCONSULT-III only
“TRANSMISSION”
— P0703 BRAKE SW/CIRCTM-210
P0705 P0705 PNP SW/CIRCTM-213
P0710 P0710 ATF TEMP SEN/CIRCTM-216
P0715 P0715 INPUT SPD SEN/CIRCTM-218
P0720 P0720 VEH SPD SEN/CIR ATTM-222
— P0725 ENGINE SPEED SIGTM-226
— P0730 BELT DAMGTM-228
P0740 P0740 TCC SOLENOID/CIRCTM-230
P0744 P0744 A/T TCC S/V FNCTNTM-232
P0745 P0745 L/PRESS SOL/CIRCTM-234
P0746 P0746 PRS CNT SOL/A FCTNTM-236
P0776 P0776 PRS CNT SOL/B FCTNTM-238
P0778 P0778 PRS CNT SOL/B CIRCTM-240
P0840 P0840 TR PRS SENS/A CIRCTM-242
— P0841 PRESS SEN/FNCTNTM-245
— P0868 SEC/PRESS DOWNTM-247
— P1701 TCM-POWER SUPPLYTM-249
— P1705 TP SEN/CIRC A/TTM-252
— P1722 ESTM VEH SPD SIGTM-253
— P1723 CVT SPD SEN/FNCTNTM-255
— P1726 ELEC TH CONTROLTM-257
P1740 P1740 LU-SLCT SOL/CIRCTM-258
— P1745 L/PRESS CONTROLTM-260
P1777 P1777 STEP MOTR CIRCTM-261
P1778 P1778 STEP MOTR/FNCTM-264
U1000 U1000 CAN COMM CIRCUITTM-208
— U1010 CONTROL UNIT (CAN)TM-209

TM-286
< SYMPTOM DIAGNOSIS >[CVT: RE0F10A]
SYSTEM SYMPTOM
SYMPTOM DIAGNOSIS
SYSTEM SYMPTOM
Symptom TableINFOID:0000000003806492
The diagnostics item numbers show the sequence for inspection. Inspect in order from item 1.
No
.Item Symptom Condition Diagnostic Item Reference
1
Shift ShockLarge shock. (“N”→
“D” position)ON vehicle1. Engine idle speedEC-14
2. Engine speed signalTM-226
3. Accelerator pedal position sensorTM-252
4. CVT positionTM-314
5. CVT fluid temperature sensorTM-216
6. CAN communication lineTM-208
7. CVT fluid level and stateTM-304
8. Line pressure testTM-308
9. Torque converter clutch solenoid valveTM-230
10. Lock-up select solenoid valveTM-258
11 . P N P s w i t c hTM-213
OFF vehicle12. Forward clutch
TM-33213. Control valve
2Large shock. (“N”→
“R” position)ON vehicle1. Engine idle speedEC-14
2. Engine speed signalTM-226
3. Accelerator pedal position sensorTM-252
4. CVT positionTM-314
5. CVT fluid temperature sensorTM-216
6. CAN communication lineTM-208
7. CVT fluid level and stateTM-304
8. Line pressure testTM-308
9. Torque converter clutch solenoid valveTM-230
10. Lock-up select solenoid valveTM-258
11 . P N P s w i t c hTM-213
OFF vehicle12. Reverse brake
TM-33213. Control valve
3Shock is too large for
lock-up.ON vehicle1. CVT positionTM-314
2. Engine speed signalTM-226
3. CAN communication lineTM-208
4. CVT fluid level and stateTM-304
OFF vehicle5. Torque converterTM-3356. Control valveTM-332

TM-288
< SYMPTOM DIAGNOSIS >[CVT: RE0F10A]
SYSTEM SYMPTOM
6
Slips/Will
Not EngageDoes not lock-up.ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Engine speed signalTM-226
4. Primary speed sensorTM-218
5. Torque converter clutch solenoid valveTM-230
6. CAN communication lineTM-208
7. Stall testTM-306
8. Step motorTM-261
9. PNP switchTM-213
10. Lock-up select solenoid valveTM-258
11. CVT fluid temperature sensorTM-216
12. Secondary speed sensorTM-222
13. Secondary pressure sensorTM-242
OFF vehicle14. Torque converterTM-33515. Oil pump assembly
TM-332
16. Control valve
7Does not hold lock-up
condition.ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Engine speed signalTM-226
4. Primary speed sensorTM-218
5. Torque converter clutch solenoid valveTM-230
6. CAN communication lineTM-208
7. Stall testTM-306
8. Step motorTM-261
9. PNP switchTM-213
10. Lock-up select solenoid valveTM-258
11. CVT fluid temperature sensorTM-216
12. Secondary speed sensorTM-222
13. Secondary pressure sensorTM-242
OFF vehicle14. Torque converterTM-33515. Oil pump assembly
TM-332
16. Control valve No
.Item Symptom Condition Diagnostic Item Reference

SYSTEM SYMPTOM
TM-289
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8
Slips/Will
Not EngageLock-up is not re-
leased.ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Engine speed signalTM-226
4. Primary speed sensorTM-218
5. Torque converter clutch solenoid valveTM-230
6. CAN communication lineTM-208
7. Stall testTM-306
OFF vehicle8. Torque converterTM-3359. Oil pump assembly
TM-332
10. Control valve
9With selector lever in
“D” position, accelera-
tion is extremely poor.ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Stall testTM-306
4. Accelerator pedal position sensorTM-252
5. CAN communication lineTM-208
6. PNP switchTM-213
7. CVT positionTM-314
8. Step motorTM-261
9. Primary speed sensorTM-218
10. Secondary speed sensorTM-222
11. Accelerator pedal position sensorTM-252
12. Secondary pressure sensorTM-242
13. CVT fluid temperature sensorTM-216
14. Power supplyTM-249
OFF vehicle15. Torque converterTM-33516. Oil pump assembly
TM-332
17. Forward clutch
18. Control valve No
.Item Symptom Condition Diagnostic Item Reference

TM-290
< SYMPTOM DIAGNOSIS >[CVT: RE0F10A]
SYSTEM SYMPTOM
10
Slips/Will
Not EngageWith selector lever in
“R” position, accelera-
tion is extremely poor.ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Stall testTM-306
4. Accelerator pedal position sensorTM-252
5. CAN communication lineTM-208
6. PNP switchTM-213
7. CVT positionTM-314
8. Step motorTM-261
9. Primary speed sensorTM-218
10. Secondary speed sensorTM-222
11. Accelerator pedal position sensorTM-252
12. Secondary pressure sensorTM-242
13. CVT fluid temperature sensorTM-216
14. Power supplyTM-249
OFF vehicle15. Torque converterTM-33516. Oil pump assembly
TM-332
17. Reverse brake
18. Control valve
11 S l i p s a t l o c k - u p .ON vehicle1. CVT fluid level and stateTM-304
2. Line pressure testTM-308
3. Engine speed signalTM-226
4. Primary speed sensorTM-218
5. Torque converter clutch solenoid valveTM-230
6. CAN communication lineTM-208
7. Stall testTM-306
8. Step motorTM-261
9. PNP switchTM-213
10. Lock-up select solenoid valveTM-258
11. CVT fluid temperature sensorTM-216
12. Secondary speed sensorTM-222
13. Secondary pressure sensorTM-242
OFF vehicle14. Torque converterTM-33515. Oil pump assembly
TM-332
16. Control valve No
.Item Symptom Condition Diagnostic Item Reference