2003 NISSAN TEANA sensor

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-121
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CVT

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 A (SECOND-
ARY PRESSURE SENSOR) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM connector and CVT 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 37
Ye s
CVT unit harness connector F49 23
SCIA4690E

CVT-122
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)

5. CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to CVT-118, "
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 P0841 PRESSURE SENSOR FUNCTION
CVT-123
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DTC P0841 PRESSURE SENSOR FUNCTIONPFP:31936
DescriptionBCS001K3
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signal, 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.
CONSULT-II Reference ValueBCS001K4
Remarks: Specification data are reference values.
On Board Diagnosis LogicBCS001K5
Diagnostic trouble code “P0841 PRESS SEN/FNCTN” with CONSULT-II is detected when correlation between
the values of the secondary pressure sensor and the primary pressure sensor is out of specification.
Possible CauseBCS001K6

Transmission fluid pressure sensor A (Secondary pressure sensor)

Transmission fluid pressure sensor B (Primary pressure sensor)

Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation ProcedureBCS001K7
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. Start engine and maintain the following conditions for at least 12
consecutive seconds.
VEHICLE SPEED: 40 km/h (25 MPH) More than
RANGE: “D” position
3. If DTC is detected, go to CVT-124, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 - 3.5 V
SEC HYDR SEN1.0 V
BCIA0031E

CVT-124
DTC P0841 PRESSURE SENSOR FUNCTION

Diagnostic ProcedureBCS001K8
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to CVT-47, "
SELF-DIAGNOSTIC RESULT MODE" .
Is any malfunction of the
“U1000 CAN COMM CIRCUIT” indicated?
YES >> Check CAN communication line. Refer to CVT-53, "DTC U1000 CAN COMMUNICATION LINE" .
NO >> GO TO 2.
2. CHECK INPUT SIGNALS
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 “SEC HYDR SEN” and
“PRI HYDR SEN”.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector terminals and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 3.
3. CHECK LINE PRESSURE
Perform line pressure test. Refer to CVT-33, "
LINE PRESSURE
TEST" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to CVT-34,
"Judgement of Line Pressure Test" .
Item name Condition Display value (Approx.)
PRI HYDR SEN
“N” position idle0.7 - 3.5 V
SEC HYDR SEN 1.0 V
SCIA2277E
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission fluid
pressure sensor B
(Primary pres-
sure sensor)
F10741 - Ground
“N” position idle0.7 - 3.5 V
Transmission fluid
pressure sensor A
(Secondary pres-
sure sensor)37 - Ground 1.0 V
SCIA6879E
SAT494G

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