check transmission fluid NISSAN TEANA 2008 Owner's Manual

P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SEN-
SOR)
TM-75
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 5.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A
(SECONDARY PRESSURE SENSOR)] (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit connector.
3. Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side har-
ness connector terminal.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR A
(SECONDARY PRESSURE SENSOR)] (PART 2)
Check continuity between TCM vehicle side harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
5.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART
1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit connector.
3. Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side har-
ness connector terminals.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace damaged parts.
6.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART
2)
Check continuity between TCM vehicle side harness connector terminals and ground.
TCM connector
Voltage (Approx.)
ConnectorTe r m i n a l
(+) (-)
F23 26 25 4.75 - 5.25 V
TCM vehicle side harness connector CVT unit vehicle side harness connector
Continuity
Connector Terminal Connector Terminal
F2315F2423Existed
TCM vehicle side harness connector
GroundContinuity
Connector Terminal
F23 15 Not existed
TCM vehicle side harness connector CVT unit vehicle side harness connector
Continuity
Connector Terminal Connector Terminal
F2325
F2419
Existed
26 20

TM-76
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P0840 TRANSMISSION FLUID PRESSURE SENSOR A (SEC PRESSURE SEN-
SOR)
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.CHECK TCM
1. Replace with the same type of TCM. Refer to TM-153, "
Exploded View".
2. Connect each connector.
3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to TM-74, "
DTC Logic".
Is
“P0840 TR PRS SENS/A CIRC” detected?
YES >> Replace transaxle assembly. Refer to TM-168, "Exploded View".
NO >> Replace TCM. Refer to TM-153, "
Exploded View".
8.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace TCM. Refer to TM-153, "Exploded View".
NO >> Repair or replace damaged parts.
TCM vehicle side harness connector
GroundContinuity
Connector Terminal
F2325
Not existed
26

P0841 PRESSURE SENSOR FUNCTION
TM-77
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
P0841 PRESSURE SENSOR FUNCTION
DescriptionINFOID:0000000003849005
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signals, TCM changes the operating pressure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.
DTC LogicINFOID:0000000003849006
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
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. Start engine and maintain the following conditions for at least 12 consecutive seconds.
Is
“P0841 PRESS SEN/FNCTN” detected?
YES >> Go to TM-77, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003849007
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to TM-146, "
Inspection and Judgment".
Is the inspection result normal?
YES >> .GO TO 2.
NO >> Repair or replace damaged parts. Refer to TM-146, "
Inspection and Judgment".
2.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to TM-74, "
Descrip-
tion".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor B (primary pressure sensor) system. Refer to TM-80, "
Description".
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P0841 PRESS SEN/FNCTNCorrelation between the values of the trans-
mission fluid pressure sensor A (secondary
pressure sensor) and the transmission fluid
pressure sensor B (primary pressure sen-
sor) is out of specification. Harness or connectors
(Sensor circuit is open or shorted.)
 Transmission fluid pressure sensor A
(secondary pressure sensor)
 Transmission fluid pressure sensor B (pri-
mary pressure sensor)
VEHICLE SPEED : 40 km/h (25 MPH) or more
RANGE : “D” position

TM-80
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P0845 TRANSMISSION FLUID PRESSURE SENSOR B (PRI PRESSURE SEN-
SOR)
P0845 TRANSMISSION FLUID PRESSURE SENSOR B (PRI PRESSURE
SENSOR)
DescriptionINFOID:0000000003849010
The transmission fluid pressure sensor B (primary pressure sensor) detects primary pressure of CVT and
sends the signal to the TCM.
DTC LogicINFOID:0000000003849011
DTC DETECTION LOGIC
DTC CONFIRMATION 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 line temperature sensor is within the range below.
4. Start engine and wait for at least 5 consecutive seconds.
With GST
Follow the procedure “With CONSULT-III”.
Is
“P0845 TR PRS SENS/B CIRC” detected?
YES >> Go to TM-80, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003849012
1.CHECK INPUT SIGNAL
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 2.
2.CHECK SENSOR POWER AND SENSOR GROUND
Check voltage between TCM connector terminals.
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P0845 TR PRS SENS/B CIRCSignal voltage of the transmission fluid pres-
sure sensor B (primary pressure sensor) is
too high or too low while driving. Harness or connectors
(Sensor circuit is open or shorted.)
 Transmission fluid pressure sensor B (pri-
mary pressure sensor)
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)
TCM connector
GroundCondition Voltage (Approx.)
Connector Terminal
F23 14 “N” position idle 0.5 - 0.8 V

P0845 TRANSMISSION FLUID PRESSURE SENSOR B (PRI PRESSURE SEN-
SOR)
TM-81
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 5.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR B
(PRIMARY PRESSURE SENSOR)] (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit connector.
3. Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side har-
ness connector terminal.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR B
(PRIMARY PRESSURE SENSOR)] (PART 2)
Check continuity between TCM vehicle side harness connector terminal and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
5.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART
1)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit connector.
3. Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side har-
ness connector terminals.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace damaged parts.
6.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART
2)
Check continuity between TCM vehicle side harness connector terminals and ground.
TCM connector
Voltage (Approx.)
ConnectorTe r m i n a l
(+) (-)
F23 25 26 4.75 - 5.25 V
TCM vehicle side harness connector CVT unit vehicle side harness connector
Continuity
Connector Terminal Connector Terminal
F2314F2425Existed
TCM vehicle side harness connector
GroundContinuity
Connector Terminal
F23 14 Not existed
TCM vehicle side harness connector CVT unit vehicle side harness connector
Continuity
Connector Terminal Connector Terminal
F2325
F2419
Existed
26 20

TM-82
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P0845 TRANSMISSION FLUID PRESSURE SENSOR B (PRI PRESSURE SEN-
SOR)
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.CHECK TCM
1. Replace with the same type of TCM. Refer to TM-153, "
Exploded View".
2. Connect each connector.
3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to TM-80, "
DTC Logic".
Is
“P0845 TR PRS SENS/B CIRC” detected?
YES >> Replace transaxle assembly. Refer to TM-168, "Exploded View".
NO >> Replace TCM. Refer to TM-153, "
Exploded View".
8.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace TCM. Refer to TM-153, "Exploded View".
NO >> Repair or replace damaged parts.
TCM vehicle side harness connector
GroundContinuity
Connector Terminal
F2325
Not existed
26

P0868 SECONDARY PRESSURE DOWN
TM-83
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
C
E
F
G
H
I
J
K
L
MA
B
TM
N
O
P
P0868 SECONDARY PRESSURE DOWN
DescriptionINFOID:0000000003849013
The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure
to suit the driving condition in response to the signal sent from the TCM.
DTC LogicINFOID:0000000003849014
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
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 10 consecutive seconds.
Is
“P0868 SEC/PRESS DOWN” detected?
YES >> Go to TM-83, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003849015
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to TM-146, "
Inspection and Judgment".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace damaged parts. Refer to TM-146, "
Inspection and Judgment".
2.CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)
1. Turn ignition switch OFF.
2. Disconnect CVT unit connector.
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P0868 SEC/PRESS DOWNSecondary fluid pressure is too low com-
pared with the commanded value while driv-
ing. Harness or connectors
(Solenoid circuit is open or shorted.)
 Pressure control solenoid valve B (sec-
ondary pressure solenoid valve) system
 Transmission fluid pressure sensor A
(secondary pressure sensor)
 Line pressure control system
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)
VEHICLE SPEED (accelerate slow-
ly): 0 → 50 km/h (31 MPH)
ACC PEDAL OPEN : 0.5/8 – 1.0/8
RANGE : “D” position

TM-84
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P0868 SECONDARY PRESSURE DOWN
3. Check pressure control solenoid valve B (secondary pressure solenoid valve). Refer to TM-84, "Compo-
nent Inspection [Pressure Control Solenoid Valve B (Secondary Pressure Solenoid Valve)]".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)
Check pressure control solenoid valve A (line pressure solenoid valve). Refer to TM-84, "
Component Inspec-
tion [Pressure Control Solenoid Valve A (Line Pressure Solenoid Valve)]".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to TM-74, "
DTC
Logic".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace TCM. Refer to TM-153, "Exploded View".
NO >> Repair or replace damaged parts.
Component Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid
Va l v e ) ]
INFOID:0000000003849016
1.CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)
Check resistance between CVT unit connector terminal and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace transaxle assembly. Refer to TM-168, "
Exploded View".
Component Inspection [Pressure Control Solenoid Valve B (Secondary Pressure So-
lenoid Valve)]
INFOID:0000000003849017
1.CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)
Check resistance between CVT unit connector terminal and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace transaxle assembly. Refer to TM-168, "
Exploded View".
CVT unit connector
GroundResistance (Approx.)
Connector Terminal
F24 2 3.0 – 9.0 Ω
CVT unit connector
GroundResistance (Approx.)
Connector Terminal
F24 3 3.0 – 9.0 Ω

TM-96
< COMPONENT DIAGNOSIS >[CVT: RE0F09B]
P1745 LINE PRESSURE CONTROL
P1745 LINE PRESSURE CONTROL
DescriptionINFOID:0000000003849037
The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to the signal sent from the TCM.
DTC LogicINFOID:0000000003849038
DTC DETECTION LOGIC
DTC CONFIRMATION 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.
Is
“P1745 L/PRESS CONTROL” detected?
YES >> Go to TM-96, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000003849039
1.CHECK DTC
With CONSULT-III
1. Start engine.
2. Perform “Self-Diagnostic Results” mode for “TRANSMISSION”.
Is
“P1745 L/PRESS CONTROL” detected?
YES >> Replace TCM. Refer to TM-153, "Exploded View".
NO >> Check intermittent incident. Refer to GI-35, "
Intermittent Incident".
DTCItem
(CONSULT-III screen term)Malfunction is detected when... Possible cause
P1745 L/PRESS CONTROL TCM detects the unexpected line pressure. TCM
ATF TEMP SEN : 1.0 – 2.0 V
If 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)

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