P0712

DTC P0712: TC-SST-ECU temperature sensor system (Output low range out)

CAUTION:
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

DIAGNOSTIC FUNCTION
TC-SST-ECU checks that the output of the ECU temperature sensor is normal.

DESCRIPTIONS OF MONITOR METHODS
The output of the ECU temperature is determined to be too low.

MONITOR EXECUTION
^ Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0711: TC-SST-ECU temperature sensor system (Gradient error)
^ P0713: TC-SST-ECU temperature sensor system (Output high range out)
^ P1808: TC-SST-ECU temperature, fluid temperature sensor system (Correlation error)

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA
^ Fluid temperature: -50°C (-58°F) or less. (400 millisecond)

OBD-II DRIVE CYCLE PATTERN
The TC-SST-ECU temperature remains -50°C (-58°F) or more for 400 milliseconds.

PROBABLE CAUSES
^ Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q: Is DTC No. P0712 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.