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 signals, 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.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
Always drive vehicle at a safe speed.
NOTE:
Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

1. CHECK DTC DETECTION

With CONSULT
1.Turn ignition switch ON.
2.Select "Data Monitor" in "TRANSMISSION".
3.Start engine and maintain the following conditions for at least 12 consecutive seconds.





Is "P0841" detected?
YES- Go to .
NO- Check intermittent incident. Intermittent Incident.


Diagnosis Procedure


1. CHECK LINE PRESSURE

Perform line pressure test. Testing and Inspection.
Is the inspection result normal?
YES- .GO TO 2.
NO- Repair or replace damaged parts. Testing and Inspection.

2. CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. P0840.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace damaged parts.

3. CHECK PRIMARY PRESSURE SENSOR SYSTEM

Check primary pressure sensor system. P0845.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace damaged parts.

4. CHECK LINE PRESSURE SOLENOID VALVE

1.Turn ignition switch OFF.
2.Disconnect CVT unit connector.
3.Check line pressure solenoid valve. .
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace damaged parts.

5. CHECK SECONDARY PRESSURE SOLENOID VALVE

Check secondary pressure solenoid valve. .
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace damaged parts.

6. CHECK STEP MOTOR SYSTEM

Check step motor system. P1777.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace damaged parts.

7. DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES- Replace TCM. Exploded View.
NO- Repair or replace damaged parts.


Component Inspection (Line Pressure Solenoid Valve)


1. CHECK LINE PRESSURE SOLENOID VALVE






Check resistance between CVT unit connector terminal and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace transaxle assembly. Exploded View.


Component Inspection (Secondary Pressure Solenoid Valve)


1. CHECK SECONDARY PRESSURE SOLENOID VALVE






Check resistance between CVT unit connector terminal and ground.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace transaxle assembly. Exploded View.