2008 NISSAN TEANA engine

TM-100
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P1778 STEP MOTOR - FUNCTION
P1778 STEP MOTOR - FUNCTION
DescriptionINFOID:0000000003849044
 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:0000000003849045
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-100, "
Diagnosis Procedure".
NOTE:
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
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 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-100, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003849046
1.CHECK STEP MOTOR SYSTEM
Check step motor system. Refer to TM-97, "
Description".
Is the inspection result normal?
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P1778 STEP MOTR/FNCThere is a big difference between the num-
ber of steps for the stepping motor and for
the actual gear ratio.Ste p m ot or
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-102
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
DescriptionINFOID:0000000003849047
 TCM sends position indicator signals to combination meter via CAN communication line.
 The selector lever position is indicated on the shift position indicator.
Component Function CheckINFOID:0000000003849048
1.CHECK SHIFT POSITION INDICATOR
CAUTION:
Always drive vehicle at a safe speed.
1. Start engine.
2. Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to TM-102, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003849049
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “RANGE” on “Data Monitor” and read out the value.
3. Check that correct selector lever position (“P”, “R”, “N”, “D”, “L”) is displayed as selector lever is moved
into each position.
Is the inspection result normal?
YES >> INSPECTION END
NO-1 (CVT position indicator does not indicate “L” when selector lever is moved into “L”.)>>Check the fol-
lowing.
 Check sport mode switch. Refer to TM-108, "
Description".
 Check CVT main system (Fail-safe function actuated).
- Perform “Self-Diagnostic Results” mode for “TRANSMISSION”.
NO-2 (The actual gear position changes, but the shift position indicator is not indicated.)>>Perform “Self-
Diagnostic Results” mode for “TRANSMISSION”.
NO-3 (The actual gear position and the indication on the shift position indicator do not coincide.)>>Perform
“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-111
< ECU DIAGNOSIS >[CVT: RE0F09B]
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ECU DIAGNOSIS
TCM
Reference ValueINFOID:0000000003849059
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 0.5 - 0.8 V
PRI HYDR SEN “N” position idle 0.7 - 3.5 V
ATFTEMP COUNT* When CVT fluid temperature is 20°C (68°F). 47
When CVT fluid temperature is 80°C (176°F). 161
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 driving50 X Approximately matches the speedom-
eter reading.
ENG SPEED Engine running Closely matches the tachometer reading.
GEAR RATIO During driving 2.37 - 0.43
ACC PEDAL OPENReleased accelerator pedal - Fully depressed
accelerator pedal0.0/8 - 8.0/8
SEC PRESS “N” position idle 0.5 - 0.9 MPa
PRI PRESS “N” position idle 0.3 - 0.9 MPa
STM STEP During driving -20 step – 190 step
ISOLT1Lock-up OFF 0.0 A
Lock-up ON 0.7 A
ISOLT2Release your foot from the accelerator pedal. 0.8 A
Press the accelerator pedal all the way down. 0.0 A
ISOLT3Secondary pressure low - Secondary pressure
high.0.8 - 0.0 A
SOLMON1Lock-up OFF 0.0 A
Lock-up ON 0.6 - 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
INH SW3MSelector lever in “D” and “L” positions On
Selector lever in “P”, “R” and “N” positions Off
INH SW4Selector lever in “R” and “D” positions On
Selector lever in “P”, “N” and “L” positions Off

TCM
TM-121
< ECU DIAGNOSIS >[CVT: RE0F09B]
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P Output Speed Sensor (Secondary Speed Sensor)
The shift pattern is changed in accordance with the throttle position when an unexpected signal is sent from
the output speed sensor (secondary speed sensor) to the TCM. The sport mode is inhibited, and the transaxle
is put in “D”.
Input Speed Sensor (Primary Speed Sensor)
The shift pattern is changed in accordance with the 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 sport
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 5,000
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 inputted to the TCM, sec-
ondary 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 valve to the TCM, the pressure control solenoid A (line pres-
sure 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 valve to the TCM, the pressure control solenoid B (secondary
pressure 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 valve to the TCM, the torque converter clutch solenoid valve
is turned OFF to cancel the lock-up.
Ste p M oto r
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 valve 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 the TCM. Normal status is restored when turning the ignition
switch OFF to ON after the normal power supply.
DTC Inspection Priority ChartINFOID:0000000003849062
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 indicated with other DTCs, start from a diagnosis for “DTC
U1000 CAN COMMUNICATION LINE”. Refer to TM-41
.
DTC IndexINFOID:0000000003849063
NOTE:
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

TM-122
< ECU DIAGNOSIS >[CVT: RE0F09B]
TCM
If DTC “U1000 CAN COMM CIRCUIT” is indicated with other DTCs, start from a diagnosis for “DTC
U1000 CAN COMMUNICATION LINE”. Refer to TM-41
.
 *1: These numbers are prescribed by ISO 15031-6.
 *2: Refer to TM-35, "
Diagnosis Description". DTC
*1
Items
(CONSULT-III screen terms)Reference
MIL*2, “ENGINE” with CON-
SULT-III or GSTCONSULT-III only “TRANS-
MISSION”
— P0615 STARTER RELAY/CIRCTM-42
— P0703 BRAKE SW/CIRCTM-44
P0705 P0705 PNP SW/CIRCTM-47
P0710 P0710 ATF TEMP SEN/CIRCTM-50
P0715 P0715 INPUT SPD SEN/CIRCTM-52
P0720 P0720 VEH SPD SEN/CIR ATTM-55
— P0725 ENGINE SPEED SIGTM-59
— P0730 BELT DAMGTM-60
P0740 P0740 TCC SOLENOID/CIRCTM-62
P0744 P0744 A/T TCC S/V FNCTNTM-64
P0745 P0745 L/PRESS SOL/CIRCTM-66
P0746 P0746 PRS CNT SOL/A FCTNTM-68
P0776 P0776 PRS CNT SOL/B FCTNTM-70
P0778 P0778 PRS CNT SOL/B CIRCTM-72
P0840 P0840 TR PRS SENS/A CIRCTM-74
— P0841 PRESS SEN/FNCTNTM-77
P0845 P0845 TR PRS SENS/B CIRCTM-80
— P0868 SEC/PRESS DOWNTM-83
— P1701 TCM-POWER SUPPLYTM-85
— P1705 TP SEN/CIRC A/TTM-88
— P1722 ESTM VEH SPD SIGTM-89
— P1723 CVT SPD SEN/FNCTNTM-91
— P1726 ELEC TH CONTROLTM-93
P1740 P1740 LU-SLCT SOL/CIRCTM-94
— P1745 L/PRESS CONTROLTM-96
P1777 P1777 STEP MOTR CIRCTM-97
P1778 P1778 STEP MOTR/FNCTM-100
U1000 U1000 CAN COMM CIRCUITTM-41

SYSTEM SYMPTOM
TM-123
< SYMPTOM DIAGNOSIS >[CVT: RE0F09B]
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SYMPTOM DIAGNOSIS
SYSTEM SYMPTOM
Symptom TableINFOID:0000000003849064
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-59
3. Accelerator pedal position sensorTM-88
4. CVT positionTM-152
5. CVT fluid temperature sensorTM-50
6. CAN communication lineTM-41
7. CVT fluid level and stateTM-142
8. Line pressure testTM-146
9. Torque converter clutch solenoid valveTM-62
10. Lock-up select solenoid valveTM-94
11. PNP switchTM-44
OFF vehicle12. Forward clutch
TM-16813. Control valve
2Large shock. (“N”→
“R” position)ON vehicle1. Engine idle speedEC-14
2. Engine speed signalEC-14
3. Accelerator pedal position sensorTM-88
4. CVT positionTM-152
5. CVT fluid temperature sensorTM-50
6. CAN communication lineTM-41
7. CVT fluid level and stateTM-142
8. Line pressure testTM-146
9. Torque converter clutch solenoid valveTM-62
10. Lock-up select solenoid valveTM-94
11. PNP switchTM-44
OFF vehicle12. Reverse brake
TM-16813. Control valve
3Shock is too large for
lock-up.ON vehicle1. CVT positionTM-152
2. Engine speed signalTM-59
3. CAN communication lineTM-41
4. CVT fluid level and stateTM-142
OFF vehicle5. Torque converterTM-1726. Control valveTM-168

SYSTEM SYMPTOM
TM-125
< SYMPTOM DIAGNOSIS >[CVT: RE0F09B]
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P6
Slips/Will
Not EngageDoes not lock-up.ON vehicle1. CVT fluid level and stateTM-142
2. Line pressure testTM-146
3. Engine speed signalTM-59
4. Primary speed sensorTM-52
5. Torque converter clutch solenoid valveTM-62
6. CAN communication lineTM-41
7. Stall testTM-144
8. Step motorTM-97
9. PNP switchTM-44
10. Lock-up select solenoid valveTM-94
11. CVT fluid temperature sensorTM-50
12. Secondary speed sensorTM-55
13. Secondary pressure sensorTM-74
OFF vehicle14. Torque converterTM-17215. Oil pump assembly
TM-168
16. Control valve
7Does not hold lock-up
condition.ON vehicle1. CVT fluid level and stateTM-142
2. Line pressure testTM-146
3. Engine speed signalTM-59
4. Primary speed sensorTM-52
5. Torque converter clutch solenoid valveTM-62
6. CAN communication lineTM-41
7. Stall testTM-144
8. Step motorTM-97
9. PNP switchTM-44
10. Lock-up select solenoid valveTM-94
11. CVT fluid temperature sensorTM-50
12. Secondary speed sensorTM-55
13. Secondary pressure sensorTM-74
OFF vehicle14. Torque converterTM-17215. Oil pump assembly
TM-168
16. Control valve No. Item Symptom Condition Diagnostic item Reference

TM-126
< SYMPTOM DIAGNOSIS >[CVT: RE0F09B]
SYSTEM SYMPTOM
8
Slips/Will
Not EngageLock-up is not re-
leased.ON vehicle1. CVT fluid level and stateTM-142
2. Line pressure testTM-146
3. Engine speed signalTM-59
4. Primary speed sensorTM-52
5. Torque converter clutch solenoid valveTM-62
6. CAN communication lineTM-41
7. Stall testTM-144
OFF vehicle8. Torque converterTM-1729. Oil pump assembly
TM-168
10. Control valve
9With selector lever in
“D” position, accelera-
tion is extremely poor.ON vehicle1. CVT fluid level and stateTM-142
2. Line pressure testTM-146
3. Stall testTM-144
4. Accelerator pedal position sensorTM-88
5. CAN communication lineTM-41
6. PNP switchTM-44
7. CVT positionTM-152
8. Step motorTM-97
9. Primary speed sensorTM-52
10. Secondary speed sensorTM-55
11. Accelerator pedal position sensorTM-88
12. Primary pressure sensorTM-80
13. Secondary pressure sensorTM-74
14. CVT fluid temperature sensorTM-50
15. TCM power supply and groundTM-85
OFF vehicle16. Torque converterTM-17217. Oil pump assembly
TM-168
18. Forward clutch
19. Control valve No. Item Symptom Condition Diagnostic item Reference