Continuously Variable Transmission/Transaxle, CVT

DTC P0841: Abnormality in Line Pressure Sensor Function

DIAGNOSTIC FUNCTION
TCM conducts fault detection by comparing the target line pressure reading with the actual secondary pressure reading.

DESCRIPTIONS OF MONITOR METHODS
The actual secondary pressure reading is 0.675 mPa (98 psi) or more, and the status over the target line pressure remains for 5 seconds.

MONITOR EXECUTION
^ transmission range:D
^ Throttle valve opening : 1/8 or more
^ Engine speed : 450 r/min or more
^ CVT fluid temperature : from 20 to 180°C (68~356°F)

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ Not applicable

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions
^ Transmission range switch position: D.
^ Throttle position sensor voltage: 1.37 volts or more.
^ Engine speed: 450 r/min or more.
^ Transmission fluid temperature: 20°C (68°F) or more.
^ Transmission fluid temperature: 180°C (356°F) or less.
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.

Judgment Criteria
^ The actual secondary pressure reading is 0.675 mPa (98 psi) or more, and the status over the target line pressure remains for 5 seconds.

OBD-II DRIVE CYCLE PATTERN
transmission range: D (Drive the vehicle for 10 seconds or more while the accelerator opening angle is 20% or more)

PROBABLE CAUSES
^ Abnormal line pressure
^ Abnormality in secondary pressure sensor system
^ Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Check other diagnostic trouble codes.

Q:Are other diagnostic trouble codes set?
YES : Go to the appropriate troubleshooting. Continuously Variable Transaxle (CVT)
NO : Go to Step 2.

STEP 2. Line pressure check
Carry out "hydraulic test." Hydraulic Pressure Test

Q:Is the check result normal?
YES : Go to Step 3.
NO : Repair according to the hydraulic pressure test diagnosis table.

STEP 3. Symptom recheck after erasing diagnostic trouble code

Q:Is the check result normal?
YES : Intermittent malfunction
NO : Replace TCM.