Continuously Variable Transaxle (CVT)

DTC P0841: Abnormality in Line Pressure Sensor Function

DIAGNOSTIC FUNCTION
TCM conducts fault detection by comparing the secondary pressure sensor reading with the primary pressure sensor reading.

DESCRIPTIONS OF MONITOR METHODS
^ The pulley ratio range is from 0.5 to 1, and the relationship between the actual primary and secondary pressures shown as the pulley ratio is below 0.5 or above 1.

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
^ Actual primary pressure [pulley ratio (primary pulley ratio/secondary pulley ratio): more than 0.5 and less than 1]: lower limit of primary pressure. (5 seconds)
^ Actual primary pressure [pulley ratio (primary pulley ratio/secondary pulley ratio): more than 0.5 and less than 1]: upper limit of primary pressure. (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 primary pressure sensor system
^ Abnormality in secondary pressure sensor system
^ Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Check other diagnosis codes.

Q: Are other diagnosis codes set?
YES: Go to the appropriate troubleshooting.
NO: Go to Step 2.

STEP 2. M.U.T.-III data list
^ Item 18: Primary pressure
^ Item 19: Secondary pressure

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Go to Step 3.

STEP 3. Line pressure check
Carry out "hydraulic test".

Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair according to the hydraulic pressure test diagnosis table.

STEP 4. Symptom recheck after erasing diagnosis code

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