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.

DTC Logic

DTC DETECTION LOGIC

1. Turn ignition switch ON.
2. Select "DATA MONITOR".
3. Start engine and maintain the following conditions for at least 12 consecutive seconds.

VEHICLE SPEED : 40 km/h (25 MPH) or more
RANGE : "D" position

Is "P0841 PRESS SEN/FNCTN" detected?
YES >> Go to Diagnosis Procedure.
NO >> Check intermittent incident. Refer to See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Intermittent Incident.

Diagnosis Procedure
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to See: Transmission and Drivetrain\Continuously Variable Transmission/Transaxle\Description and Operation\CVT RE0F09B\Line Pressure Test.
Is the Inspection result normal?
YES >> .GO TO 2.
NO >> Repair or replace damaged parts. Refer to See: Transmission and Drivetrain\Continuously Variable Transmission/Transaxle\Description and Operation\CVT RE0F09B\Line Pressure Test.
2.CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to See: P0840\CVT RE0F09B.
Is the Inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM
Check transmission fluid pressure sensor B (primary pressure sensor) system. Refer to See: P0845.
Is the Inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

1. Turn ignition switch OFF.
2. Disconnect CVT unit harness connector.
3. Check pressure control solenoid valve A (line pressure solenoid valve). Refer to Component Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid Valve)]. Is the Inspection result normal?

YES >> GO TO 5.
NO >> Repair or replace damaged parts.
5.CHECK PRESSURE CONTROL SOLENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)
Check pressure control solenoid valve B (secondary pressure solenoid valve). Refer to Component Inspection [Pressure Control Solenoid Valve B (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. Refer to See: P1777\CVT RE0F09B.
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. Refer to See: Powertrain Management\Transmission Control Systems\Control Module, CVT\Service and Repair\CVT RE0F09B\Exploded View.
NO >> Repair or replace damaged parts.

Component Inspection [Pressure Control Solenoid Valve A (Line Pressure Solenoid Valve)]
1.CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)