[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
23 -AUTOMATIC TRANSMISSION > 23A-CVT > TROUBLESHOOTING<CVT><CVT> > DIAGNOSIS CODE PROCEDURES > CODE NO. P0741 LOCKUP MALFUNCTION
Code No. P0741: Abnormality in Lock-up Function
 
 
 
 
DIAGNOSTIC FUNCTION
Abnormality is detected by the CVT-ECU when the torque converter slip speed is high during lock-up control.
 
 
JUDGEMENT CRITERIA
While the lock-up control, all the conditions listed below remain for 30 seconds.
  • Slip speed is higher than the judgement value.
  • The lock-up differential pressure is more than 0.2 MPa.
 
 
PROBABLE CAUSES
  • Malfunction of valve body assembly (Faulty lock-up solenoid valve)
  • Malfunction of the CVT assembly
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE diagnosis code
Are diagnosis codes P2763 or P2764 set?
Carry out the appropriate troubleshooting.
Go to Step 2.
 
STEP 2. Measure the output wave pattern of the lock-up solenoid valve at CVT-ECU connector (LULS terminal).
(1) Connect the CVT assembly connector.
(2) Selector lever position: D
(3) Accelerator pedal opening angle: 12.5% or less
(4) Drive at a constant speed of approx. 20 km/h
(5) Connect an oscilloscope, and measure the voltage between CVT-ECU connector LULS terminal and body earth.
OK: A wave pattern such as the one shown on (Check Procedure Using an Oscilloscope) should be output. There should be no noise in the output wave pattern.
Is the check result normal?
Go to Step 3.
Refer to diagnosis code No.P2763: Malfunction of Lock-up Solenoid Valve (open) , or diagnosis code No.P2764: Malfunction of Lock-up Solenoid Valve (short) .
 
STEP 3. Symptom recheck after erasing diagnosis code
Turn the ignition switch to the "LOCK" (OFF) position, and wait for one minute. Then, drive the vehicle for a while and check again.
Is the diagnosis code set?
Replace the CVT assembly.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).