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DTC P0712: Malfunction of Transmission Fluid Temperature Sensor (low input)
 
 
 
 
DIAGNOSTIC FUNCTION
TCM conducts fault detection by monitoring the terminal voltage of the transmission fluid temperature sensor.
 
 
DESCRIPTIONS OF MONITOR METHODS
TCM detects the fluid temperature 180°C (356°F) or more for 5 seconds.
 
 
MONITOR EXECUTION
  • Voltage of battery: 10 volts or more.
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • P0842, P0843: Malfunction of the secondary pressure sensor
  • P0847, P0848: Malfunction of primary pressure sensor
  • P2720, P2721: Malfunction of select pressure solenoid valve
Sensor (The sensor below is determined to be normal)
  • Secondary pressure sensor
  • Primary pressure sensor
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Voltage of battery: 10 volts or more.
Judgment Criteria
  • Value of temperature of transmission fluid: 180°C (356°F) or more (5 seconds).
 
 
OBD-II DRIVE CYCLE PATTERN
Ignition switch: ON (start the engine and keep it for 10 seconds or more).
 
 
PROBABLE CAUSES
  • Malfunction of transmission fluid temperature sensor
  • Damaged wiring harness and connectors
  • Malfunction of TCM
 
 
DIAGNOSIS
Required Special Tools
  • MB992006: Extra fine probe
STEP 1. Check for short to ground in SPWR line between the CVT assembly connector and the TCM connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or the wiring harness.
 
STEP 2. Transmission fluid temperature sensor check.
Refer to .
Is the check result normal?
Go to Step 3.
Replace the transmission fluid temperature sensor (valve body harness). (Refer to ).
 
STEP 3. Symptom recheck after erasing diagnostic trouble code.
Is the diagnostic trouble code set?
Replace the TCM.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).