P0841

DTC P0841 PRESSURE SENSOR FUNCTION





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 PRESS SEN/FNCTN" 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
- Transmission fluid pressure sensor A (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 "Diagnosis Procedure".




Diagnosis Procedure
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to CONSULT-III Function (Transmission).
Is any malfunction of the "U1000 CAN COMM CIRCUIT" indicated?
YES >> Check CAN communication line. Refer to Constant Velocity Transmission (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. Refer to Inspections Before Trouble Diagnosis.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts. Refer to Inspections Before Trouble Diagnosis.
4.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to P0840.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
5.DETECT MALFUNCTIONING ITEM
Check the following:
- Pressure control solenoid valve A (Line pressure solenoid valve). Refer to P0745.
- Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to P0778.
- Step motor. Refer to P1777.
OK or NG6
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK DTC
Perform "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Replace TCM or transaxle assembly. Refer to .