P0841

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signal, TCM changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley to control the gear ratio.


CONSULT Reference Value in Data Monitor Mode

Remarks: Specification data are reference values.







On Board Diagnosis Logic

- This is not an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0841" with CONSULT is detected when secondary fluid pressure is too high compared with the commanded value while driving.


Possible Cause

- Secondary pressure sensor
- Harness or connectors (Sensor circuit is open or shorted.)


DTC Confirmation Procedure


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

1.Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
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 .


Diagnosis Procedure


1. CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Trouble Diagnosis.
Is any malfunction of the "U1000" indicated?
YES- Check CAN communication line. Refer to
NO- GO TO 2.

2. CHECK INPUT SIGNALS

With CONSULT
1.Start engine.
2.Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3.Start vehicle and read out the value of "SEC HYDR SEN" and "PRI HYDR SEN".





Without CONSULT
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. Trouble Diagnosis.
OK or NG
OK- GO TO 4.
NG- Repair or replace damaged parts. Trouble Diagnosis.

4. CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system.
OK or NG
OK- GO TO 5.
NG- Repair or replace damaged parts.

5. DETECT MALFUNCTIONING ITEM

Check the following:
- Line pressure solenoid valve. CVT.
- Step motor. P1777.
OK or NG-6
OK- GO TO 6.
NG- Repair or replace damaged parts.

6. CHECK DTC

Perform DTC Confirmation Procedure, (see above).
OK or NG
OK-INSPECTION END
NG- Replace TCM or transaxle assembly. Transaxle Assembly.