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DTC P0746: Abnormality in Hydraulic Control System Function
 
 
 
 
DIAGNOSTIC FUNCTION
TCM determines that the malfunction is present when pulley ratio becomes higher (pulley ratio range: 2.349 to 0.394).
 
 
DESCRIPTIONS OF MONITOR METHODS
  • The status with the pulley ratio of 3.5 or more continues for 0.1 second or with the pulley ratio of 2.7 or more continues for 0.2 second.
 
 
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)
  • P0741: Abnormality in lockup function
  • P0841: Abnormality in line pressure sensor function
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
  • Pulley ratio (primary pulley ratio/secondary pulley ratio): more than 3.5. (0.1 second)
  • Pulley ratio (primary pulley ratio/secondary pulley ratio): more than 2.7. (0.2 second)
 
 
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
  • Malfunction of TCM
 
 
DIAGNOSIS
STEP 1. Check other diagnostic trouble codes.
Are other diagnostic trouble codes stored?
Carry out the appropriate troubleshooting.
Go to Step 2.
 
STEP 2. Scan tool data list
Item 33: Line pressure SOL. output current (Refer to Data List Reference Table .)
Is the check result normal?
Intermittent malfunction
Go to Step 3.
 
STEP 3. Line Pressure Check
Carry out "hydraulic test"(Refer to ).
Is the check result normal?
Go to Step 4.
Repair according to the hydraulic pressure test diagnosis table.
 
STEP 4. Symptom recheck after erasing diagnostic trouble code
Is the check result normal?
Intermittent malfunction
Replace TCM.