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DTC P2763: Lock-up and Low-reverse Brake Linear Solenoid Valve System (Open circuit)
DTC P2764: Lock-up and Low-reverse Brake Linear Solenoid Valve System (Short circuit)
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
  • During 1st driving or 2nd to 6th lock-up operation, an abnormal value equivalent to open circuit is detected in the solenoid control current for 5 seconds. <P2763>
  • During 1st driving or 2nd to 6th lock-up operation, an abnormal value equivalent to short circuit is detected in the solenoid control current for 1 second. <P2764>
 
 
MONITOR EXECUTION
  • Manual mode: 1st gear driving
  • Transmission range: D (lock-up activated)
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • P0731: 1st gear incorrect ratio
  • P0732: 2nd gear incorrect ratio
  • P0733: 3rd gear incorrect ratio
  • P0734: 4th gear incorrect ratio
  • P0735: 5th gear incorrect ratio
  • P0729: 6th gear incorrect ratio
  • P0741: Malfunction of the Torque converter clutch system (Stuck off)
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions <P2763>
  • Manual mode: 1st or Lock-up status: engaging (2nd to 6th).
  • Lock-up and low-reverse brake linear solenoid valve actual command: more than 612 mA
Judgment Criteria <P2763>
  • Lock-up and low-reverse brake linear solenoid valve actual current: less than 190 mA. (5 seconds)
Check Conditions <P2764>
  • Manual mode: 1st or Lock-up status: engaging (2nd to 6th).
Judgment Criteria <P2764>
  • Lock-up and low-reverse brake linear solenoid valve actual current: more than 1.7 A (1 second)
 
 
OBD-II DRIVE CYCLE PATTERN
Drive with the sport mode (1st gear) for approximately 10 seconds, and then drive with the transmission range D, throttle valve opening 50% or less, and vehicle speed 60 km/h (37.3 mph) or more for approximately 10 seconds continuously.
 
 
PROBABLE CAUSES
  • Malfunction of the lock-up and low-reverse brake linear solenoid valve system circuit
  • Damaged harness or connector
  • Malfunction of the TCM
  • Malfunction of the lock-up and low-reverse brake linear solenoid valve (valve body assembly)

 
 
DIAGNOSIS
STEP 1. Check the TCM terminal voltage.
[TCM connector (harness side, connected)]
Measure the voltage between the LULS terminal and body ground.
  • Lock-up released: 0 V
  • Lock-up engaged: 300 Hz
Is the check result normal?
Go to Step 5.
Go to Step 2.
 
STEP 2. Check for continuity in LULS line between the TCM connector and A/T control solenoid valve assembly connector.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check the lock-up and low-reverse brake linear solenoid.
Refer to .
Is the check result normal?
Go to Step 6.
Go to Step 4.
 
STEP 4. Check for continuity in signal line between the A/T control solenoid valve assembly connector and the lock-up and low-reverse brake linear solenoid valve connector.
Is the check result satisfactory?
Replace the valve body assembly.
Repair the connector(s) or wiring harness.
 
STEP 5. Check the TCM and A/T control solenoid valve assembly connector pin terminals and the connection status.
Is the check result normal?
Go to Step 7.
Repair or replace the failure section.
 
STEP 6. Check the TCM and A/T control solenoid valve assembly connector pin terminals and the connection status.
Is the check result normal?
Replace the TCM.
Repair or replace the failure section.
 
STEP 7. Erase the DTC, and drive the vehicle for a while.
Check that the normal code is displayed.
Is the check result normal?
The procedure is complete.
Return to Step 1.