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DTC P0712: Transmission Fluid Temperature Sensor System (Short Circuit)
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
When the status of transmission fluid temperature 180°C (356°F) or more is detected for 5 seconds continuously with the conditions as follows; Vehicle speed: 10 km/h (6.2 mph) or more, transmission range switch position: D, accelerator pedal position: 12.5% or more, engine speed: more than 450 r/min
 
 
MONITOR EXECUTION
  • Transmission range: D
  • Vehicle speed: more than 10 km/h (6.2 mph)
  • Throttle valve opening: more than 1/8
  • Engine speed: more than 305 r/min
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • P0846: 2-6 brake pressure switch system
  • P0876: High clutch pressure switch system
  • P0988: Low-reverse brake pressure switch system
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Vehicle speed: 10 km/h (6.2 mph) or more.
  • Transmission range switch position: D.
  • Throttle opening: 12.5 % or more.
  • Engine speed: more than 450 r/min.
Judgment Criteria
  • Transmission fluid temperature sensor voltage: 0.16 V or less [180°C (356°F) or more}. (5 seconds)
 
 
OBD-II DRIVE CYCLE PATTERN
With the vehicle speed 10 km/h (6.2 mph) or more and the throttle valve opening 12.5% or more, drive for 10 minutes or more.
 
 
PROBABLE CAUSES
  • Malfunction of the transmission fluid temperature sensor system (Short circuit) circuit
  • Malfunction of the transmission fluid temperature sensor
  • Malfunction of the TCM

 
 
DIAGNOSIS
STEP 1. Check the TCM terminal voltage.
[TCM connector (harness side, connected)]
Turn ON the ignition switch, and check the voltage between O/TS terminal and O/T- terminal.
  • Transmission fluid 20°C (68°F): Approx. 2.52 V
  • Transmission fluid 80°C (176°F): Approx. 0.69 V
Is the check result normal?
Go to Step 6.
Go to Step 2.
 
STEP 2. Check the transmission fluid temperature sensor.
Refer to .
Is the check result normal?
Go to Step 3.
Replace the valve body assembly.
 
STEP 3. Check for short to ground in O/TS, O/T- line between the A/T control solenoid valve assembly connector and TCM connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check for open circuit and short to ground in VIG1, VIG2 line between the fusible link and the TCM connector, and check for open circuit in GND1, GND2 line between the TCM connector and body ground.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check the TCM connector pin terminal and the connection status.
Is there a failure point?
Repair or replace the failure section.
Replace the TCM.
 
STEP 6. 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.
Replace the TCM.