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-III Reference Value









On Board Diagnosis Logic
- This is not an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0841" with CONSULT-III is detected when correlation between the values of the secondary pressure sensor and the primary pressure sensor is out of specification.




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-III
1. Turn ignition switch ON and select "DATA MONITOR" 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 P0841.




Diagnosis Procedure
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. CONSULT-III Function (Transmission).
Is any malfunction of the "U1000" indicated?
YES - Check CAN communication line. CVT.
NO - GO TO 2.
2.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" 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 terminals and ground.





OK or NG
OK - GO TO 6.
NG - GO TO 3.
3.CHECK LINE PRESSURE
Perform line pressure test. Inspections Before Trouble Diagnosis.
OK or NG
OK - GO TO 4.
NG - Repair or replace damaged parts. Inspections Before Trouble Diagnosis.
4.CHECK SECONDARY PRESSURE SENSOR SYSTEM
Check secondary pressure sensor system. P0840.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
Check the following:
- Line pressure solenoid valve. P0745.
- Secondary pressure solenoid valve. P0778.
- Step motor. P1777.
OK or NG6
OK - GO TO 6.
NG - Repair or replace damaged parts.
6.CHECK DTC
Perform P0841.
OK or NG
OK - INSPECTION END
NG - Replace TCM or transaxle assembly. Removal and Installation.