NISSAN TEANA 2003 Service Manual

DTC P0841 PRESSURE SENSOR FUNCTION
CVT-125
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4. CHECK TRANSMISSION FLUID PRESSORE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-
TEM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check secondary pressure sensor system and primary pressure sensor system. Refer to CVT-118, "
DTC
P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR)" , CVT-126,
"DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRESSURE SENSOR)" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5. DETECT MALFUNCTIONING ITEM
Check the following:

Line pressure solenoid valve. Refer to CVT-101, "Component Inspection" .

Secondary pressure solenoid valve. Refer to CVT-112, "Component Inspection" .

Step motor. Refer to CVT-156, "Component Inspection" .
OK or NG6
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to CVT-123, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-193, "
Removal and Installation" .

CVT-126
DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRES-
SURE SENSOR)
PFP:31936
DescriptionBCS001K9
The primary pressure sensor detects primary pressure of CVT and sends TCM the signal.
CONSULT-II Reference ValueBCS001KA
Remarks: Specification data are reference values.
On Board Diagnosis LogicBCS001KB
Diagnostic trouble code “P0845 TR PRS SENS/B CIRC” with CONSULT-II is detected under the following con-
ditions.

When TCM detects an improper voltage drop when it receives the sensor signal.

When TCM compares target value with monitor value and detects an irregularity.
Possible CauseBCS001KC

Transmission fluid pressure sensor B (Primary pressure sensor)

Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureBCS001KD
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
2. Make sure that output voltage of line temperature sensor is
within the range below.
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)
3. Start engine and wait for at least 5 consecutive seconds.
4. If DTC is detected, go to CVT-128, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 - 3.5 V
BCIA0031E

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)
CVT-127
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Wiring Diagram — CVT — PRIPSBCS001KE
TCWM0541E

CVT-128
DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)

TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureBCS001KF
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Start vehicle and read out the value of “PRI HYDR SEN”.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
Terminal Wire color Item Condition Data (Approx.)
41 V/OTransmission fluid
pressure sensor B
(Primary pressure sen-
sor)and “N” position idle 0.7 - 3.5 V
42 W/R Sensor ground Always 0 V
46 L/O Sensor power— 5.0 V
—0 V
Item name Condition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 - 3.5 V
SCIA2277E
Name Connector Terminal ConditionVoltage
(Approx.)
Transmis-
sion fluid
pressure
sensor B
(Primary
pressure
sensor)F107 41 - Ground “N” position idle 0.7 - 3.5 V
SCIA4509E

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)
CVT-129
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2. CHECK SENSOR POWER AND SENSOR GROUND
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. CHECK HARNESS BETWEEN TCM AND CVT UNIT HARNESS CONNECTOR (SENSOR POWER
AND SENSOR GROUND)
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT unit harness connector.
3. Check continuity between TCM connector terminals and CVT
unit harness connector terminals.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> Replace TCM. Refer to CVT-9, "Precautions for TCM and CVT Assembly Replacement" .
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HARNESS BETWEEN TCM AND TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY
PRESSURE SENSOR) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CUT unit harness connector.
3. Check continuity between TCM connector terminal and CVT unit
harness connector terminal.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
Item Connector TerminalData
(Approx.)
TCM connector F107 46 - 42 5.0 V
SCIA2367E
Item Connector Terminal Continuity
TCM F107 42
Ye s
CVT unit harness connector F49 19
TCM F107 46
Ye s
CVT unit harness connector F49 20
SCIA4681E
Item Connector Terminal Continuity
TCM F107 41
Ye s
CVT unit harness connector F49 25
SCIA4691E

CVT-130
DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI
PRESSURE SENSOR)

5. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to CVT-126, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. CHECK TCM
1. Check TCM input/output signal. Refer to CVT-40, "
TCM Input/Output Signal Reference Values" .
2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the transaxle assembly. Refer to CVT-193, "Removal and Installation" .
NG >> Repair or replace damaged parts.

DTC P0868 SECONDARY PRESSURE DOWN
CVT-131
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DTC P0868 SECONDARY PRESSURE DOWNPFP:31941
DescriptionBCS001KG
The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure
to suit the driving condition in response to a signal sent from the TCM.
CONSULT-II Reference ValueBCS001KH
Remarks: Specification data are reference values.
On Board Diagnosis LogicBCS001KI
Diagnostic trouble code “P0868 SEC/PRESS DOWN” with CONSULT-II is detected when secondary fluid
pressure is too low compared with the commanded value while driving.
Possible CauseBCS001KJ

Harness or connectors
(Solenoid circuit is open or shorted.)

Pressure control solenoid valve B (Secondary pressure solenoid valve) system

Transmission fluid pressure sensor A (Secondary pressure sensor)

Line pressure control system
DTC Confirmation ProcedureBCS001KK
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
2. Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
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)
3. Start engine and maintain the following conditions for at least 10
consecutive seconds.
VEHICLE SPEED (accelerate slowly): 0 → 50 km/h (31 MPH)
ACC PEDAL OPEN: 0.5/8 - 1.0/8
RANGE: “D” position
4. If DTC is detected, go to CVT-132, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.5 MPa
BCIA0031E

CVT-132
DTC P0868 SECONDARY PRESSURE DOWN

Diagnostic ProcedureBCS001KL
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
3. Start vehicle and read out the value of “SEC PRESS”.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-33, "
LINE PRESSURE
TEST" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-34,
"Judgement of Line Pressure Test" .
3. DETECT MALFUNCTIONING ITEM
Check the following:

Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to CVT-112, "Component
Inspection" .

Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-101, "Component Inspec-
tion" .
OK or NG
OK >> GO TO 4.
NG >> 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 CVT-118, "
DTC
P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR)" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
Item name Condition Display value (Approx.)
SEC PRESS “N” position idle 0.5 MPa
SCIA2366E
SAT494G

DTC P0868 SECONDARY PRESSURE DOWN
CVT-133
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5. DETECT MALFUNCTIONING ITEM
Check the following:

Power supply and ground circuit for TCM. Refer to CVT-135, "Wiring Diagram — CVT — POWER" .

The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to CVT-131, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-193, "
Removal and Installation" .

CVT-134
DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)PFP:31036
DescriptionBCS001KM
When the power supply to the TCM is cut OFF, for example because the battery is removed, and the self-diag-
nosis memory function stops, malfunction is detected.
NOTE:
Since “P1701 TCM-POWER SUPPLY” will be indicated when replacing TCM, perform diagnosis after
erasing “SELF-DIAG RESULTS”
On Board Diagnosis LogicBCS001KN

Diagnostic trouble code “P1701 TCM-POWER SUPPLY” with CONSULT-II is detected when TCM does
not receive the voltage signal from the battery power supply.

This is not a malfunction message. (Whenever shutting OFF a power supply to the TCM, this message
appears on the screen.)
Possible CauseBCS001KO
Harness or connectors
(Battery or ignition switch and TCM circuit is open or shorted.)
DTC Confirmation ProcedureBCS001KP
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.
3. Wait for at least 2 consecutive seconds.
4. If DTC is detected, go to CVT-136, "
Diagnostic Procedure" .
BCIA0031E