P2741

DTC P2741: Fluid Temperature Sensor System (Gradient error)

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 gradient of the fluid temperature sensor is normal.

DESCRIPTIONS OF MONITOR METHODS
The temperature change is determined to be abnormal.

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)
^ P2742: Fluid temperature sensor system (Output low range out)
^ P2743: Fluid 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 change while 80 millisecond: 10° C (18° F) or more, or fluid temperature change while 80 millisecond: -10° C (-18° F) or more. (400 millisecond)

OBD-II DRIVE CYCLE PATTERN
The absolute value of the temperature rise or drop at every 80 milliseconds remains 10° C (18° F) or less 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. P2741 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.