2003 NISSAN TEANA Power

CVT-120
DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)

TCM terminal data are reference values, measured between each terminal and ground.
Diagnostic ProcedureBCS001K2
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 “SEC 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.)
37 V/WTransmission fluid
pressure sensor A
(Secondary pressure
sensor)and “N” position idle 1.0 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.)
SEC HYDR SEN “N” position idle 1.0 V
SCIA2279E
Name Connector Terminal ConditionVoltage
(Approx.)
Transmission
fluid pressure
sensor A (Sec-
ondary pres-
sure sensor)F107 37 - Ground “N” position idle 1.0 V
SCIA4508E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-121
D
E
F
G
H
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MA
B
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-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
D
E
F
G
H
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J
K
L
MA
B
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 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

DTC P0868 SECONDARY PRESSURE DOWN
CVT-133
D
E
F
G
H
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L
MA
B
CVT

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

DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)
CVT-135
D
E
F
G
H
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K
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MA
B
CVT

Wiring Diagram — CVT — POWERBCS001KQ
TCWM0542E

CVT-136
DTC P1701 TRANSMISSION CONTROL MODULE (POWER SUPPLY)

TCM terminals data are reference values, measured between each terminal and ground.
Diagnostic ProcedureBCS001KS
1. CHECK DTC
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “TRANSMISSION”
with CONSULT-II.
3. Erase self-diagnostic results. Refer to CVT-49, "
How to Erase
Self-diagnostic Results" .
4. Turn ignition switch OFF, and wait for 5 seconds or more.
5. Start engine.
6. Confirm self-diagnostic results again. Refer to CVT-47, "
SELF-
DIAGNOSTIC RESULT MODE" .
Is the
“P1701 TCM-POWER SUPPLY” displayed?
YES >> GO TO 2.
NO >>INSPECTION END
2. CHECK TCM POWER SOURCE, STEP 1
1. Turn ignition switch OFF.
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
Terminal Wire color Item Condition Data (Approx.)
10 Y Power supply— Battery voltage
—0 V
19 Y Power supply— Battery voltage
—0 V
25 B Ground Always 0 V
28 Y/RPower supply
(memory back-up)Always Battery voltage
48 B Ground Always 0 V
BCIA0031E
Name Connector Terminal ConditionVoltage
(Approx.)
Power supply
(memory back-up)F107 28 - Ground AlwaysBattery
voltage
SCIA4783E