2009 NISSAN TIIDA check transmission fluid

DTC P0840 TRANSMISSION FLUID PR
ESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
CVT-289
< SERVICE INFORMATION >
[RE0F08B] D
E
F
G H
I
J
K L
M A
B CVT
N
O P
Diagnosis Procedure
INFOID:00000000043057161.
CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start vehicle and read out the value of “SEC HYDR SEN”.
Without CONSULT-III
1. Start engine.
2. Check voltage between TCM connector terminal and ground.
OK or NG OK >> GO TO 5.
NG >> GO TO 2. 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 UNI T HARNESS CONNECTOR (SENSOR POWER ANDSENSOR 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 Item name Condition Display value (Approx.)
SEC HYDR SEN “N” position idle 1.0 V Name Connector Terminal Condition
Voltage
(Approx.)
Transmission
fluid pressure
sensor A
(Secondary
pressure sen-
sor) E32 37 - Ground “N” position idle 1.0 V SCIA4508E
Item Connector Terminal
Data (Ap-
prox.)
TCM connector E32 46 - 42 5.0 V SCIA2367E
Item Connector Terminal Continuity
TCM E32 42 Yes
CVT unit harness connector F46 19
TCM E32 46 Yes
CVT unit harness connector F46 20 SCIA4681E

CVT-290< SERVICE INFORMATION >
[RE0F08B]
DTC P0840 TRANSMISSION FLUID PR
ESSURE SENSOR A CIRCUIT (SEC
PRESSURE SENSOR)
OK >> Replace TCM. Refer to CVT-190, " Service After Replacing TCM and Transaxle Assembly " .
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HARNESS BETWEEN TCM AND TRANSMISSI ON FLUID PRESSURE SENSOR A (SECOND-ARY PRESSURE SENSOR)
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. 5.
CHECK DTC
Perform CVT-287, " DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 6. 6.
CHECK TCM
1. Check TCM input/output signals. Refer to CVT-228, " TCM Terminal and Reference Value " .
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-354, " Removal and Installation " .
NG >> Repair or replace damaged parts. Item Connector Terminal Continuity
TCM E32 37 Yes
CVT unit harness connector F46 23 SCIA4690E

CVT
N
O P
DTC P0841 PRESSURE SENSOR FUNCTION
Description INFOID:0000000004305717
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 pr essure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004305718
Remarks: Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004305719
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0841 PRESS SEN/FNCTN” with CONSULT-III is detected when secondary fluid
pressure is too high compared with the commanded value while driving.
Possible Cause INFOID:0000000004305720
• Transmission fluid pressure sensor A (Secondary pressure sensor)
• Harness or connectors
(Sensor circuit is open or shorted.)
DTC Confirmation Procedure INFOID:0000000004305721
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays 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-III
1. Turn ignition switch ON and select “DATA MO NITOR” mode for “TRANSMISSION” with CONSULT-III.
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-291, " Diagnosis Procedure " .
Diagnosis Procedure INFOID:0000000004305722CONSULT-III Function (TRANSMISSION) " .
Is any malfunction of the “ U1000 CAN COMM CIRCUIT ” indicated?
YES >> Check CAN communication line. Refer to
CVT-238 .
NO >> GO TO 2.

OK >> GO TO 6.
NG >> GO TO 3. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
4. CHECK TRANSMISSION FLUID PRESSURE SENS OR A (SECONDARY PRESSURE SENSOR) SYS- .
OK or NG OK >> GO TO 5.
NG >> Repair or replace damaged parts. Component Inspec-
tion " .
• Step motor. Refer to CVT-314, " Component Inspection " .
OK or NG6 OK >> GO TO 6.
NG >> Repair or replace damaged parts. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to CVT-354, " Removal and Installation " .
Item name Condition Display value (Approx.)
PRI HYDR SEN “N” position idle 0.7 V
SEC HYDR SEN 1.0 V Name Connector Terminal Condition
Voltage
(Approx.)
Transmission fluid
pressure sensor A
(Secondary pres-
sure sensor) E32 37 - Ground “N” position idle 1.0 V B

OK >> GO TO 5.
NG >> GO TO 2. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace damaged parts. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
Component
Inspection " .
• Pressure control solenoid valve A (Line pressure solenoid valve). Refer to CVT-276, " Component Inspec-
tion " .
OK or NG OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMISSION FLUID PRESSURE SENS OR A (SECONDARY PRESSURE SENSOR) SYS- .
OK or NG OK >> GO TO 5.
NG >> Repair or replace damaged parts. 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. DTC Confirmation Procedure " .
OK or NG OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-354, " Removal and Installation " .

OK >>
INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-354, " Removal and Installation " .
In "N" Position, Vehicle Moves INFOID:0000000004305803
SYMPTOM:
Vehicle moves forward or backwar d when selecting “N” position.
DIAGNOSTIC PROCEDURE CONSULT-III Function (TRANSMISSION) " .
Do the self-diagnostic results indicate PNP switch circuit? YES >> Check PNP switch circuit. Refer to
CVT-244 .
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-345, " Adjustment of CVT Position " .
Checking CVT Fluid " .
OK or NG OK >> GO TO 4.
NG >> Refill CVT fluid. Check at Idle " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 5. TCM Terminal and Reference Value " .
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-354, " Removal and Installation " .
NG >> Repair or replace damaged parts.
Large Shock "N" → "R" Position INFOID:0000000004305804
SYMPTOM:
There is large shock when shif ting from “N” to “R” position.
DIAGNOSTIC PROCEDURE CONSULT-III Function (TRANSMISSION) " .
Is any malfunction detec ted by self-diagnosis?YES >> Check the malfunctioning system. Refer to
CVT-230, " CONSULT-III Function (TRANSMISSION) " .
NO >> GO TO 2. Idle Speed and Ignition Timing Check " .
OK or NG

CVT
N
O P
OK >> GO TO 3.
NG >> Repair. Checking CVT Fluid " .
OK or NG OK >> GO TO 4.
NG >> Refill CVT fluid. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 5.
NG >> Check the malfunctioning item. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
Check at Idle " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 6. TCM Terminal and Reference Value " .
2. If NG, re-check TCM pin terminals for dam age or loose connection with harness connector.
OK or NG OK >> Replace the transaxle assembly. Refer to
CVT-354, " Removal and Installation " .
NG >> Repair or replace damaged parts.
Vehicle Does Not Creep Backward in "R" Position INFOID:0000000004305805
SYMPTOM: Vehicle does not creep backwar d when selecting “R” position.
DIAGNOSTIC PROCEDURE CONSULT-III Functi
on (TRANSMISSION) " .
Is any malfunction detected by self-diagnosis YES >> Check the malfunctioning system. Refer to
CVT-230, " CONSULT-III Function (TRANSMISSION) " .
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-345, " Adjustment of CVT Position " .
Checking CVT Fluid " .
OK or NG OK >> GO TO 4.
NG >> Refill CVT fluid. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 5.

Inspections before Trouble Diagnosis " .
Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 6.
NG >> Check the malfunctioning item. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
Check at Idle " .
OK or NG OK >>
INSPECTION END
NG >> GO TO 7. TCM Terminal and Reference Value " .
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-354, " Removal and Installation " .
NG >> Repair or replace damaged parts.
Vehicle Does Not Creep Forward in "D" or "L" Position INFOID:0000000004305806
SYMPTOM:
Vehicle does not creep forward wh en selecting “D” or “L” position.
DIAGNOSTIC PROCEDURE CONSULT-III Function (TRANSMISSION) " .
Is any malfunction detec ted by self-diagnosis?YES >> Check the malfunctioning system. Refer to
CVT-230, " CONSULT-III Function (TRANSMISSION) "
.
NO >> GO TO 2. Checking of CVT Position "
OK or NG
OK >> GO TO 3.
NG >> Adjust CVT position. Refer to CVT-345, " Adjustment of CVT Position " .
Checking CVT Fluid " .
OK or NG OK >> GO TO 4.
NG >> Refill CVT fluid. Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 5.
NG >> Check the malfunctioning item. Refer to CVT-219, " Inspections before Trouble Diagnosis " .
Inspections before Trouble Diagnosis " .
OK or NG OK >> GO TO 6.