P0725
DTC P0725: Malfunction of Engine SpeedDIAGNOSTIC FUNCTION
TCM detects malfunction of engine speed received from the ECM by comparing the primary pulley speed with the secondary pulley speed.
DESCRIPTIONS OF MONITOR METHODS
^ Primary pulley speed of 1,000 r/min or more and with the engine speed of 450 r/min or less
^ When the differences in rotation between the engine and the primary pulley, and between the engine and the secondary pulley are 1,000r/min or more during direct-coupled operating
^ CAN communication error occurs between ECM and TCM.
MONITOR EXECUTION
^ transmission range:D
^ Throttle valve opening : 1/8 or more
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0705: Malfunction of transmission range switch
^ P0715: Malfunction of primary pulley speed sensor
^ P0741: Abnormality in lockup function
^ P0746: Abnormality in hydraulic control system function
^ P0841: Abnormality in line pressure sensor function
^ P0868: Secondary pressure drop
^ P1706: Malfunction of throttle signal
Sensor (The sensor below is determined to be normal)
^ Transmission range switch
^ Primary pulley speed sensor
^ Accelerator pedal position sensor
LOGIC FLOW CHARTS (Monitor Sequence)
DTC SET CONDITIONS
Check Conditions
^ Transmission range switch position: D.
^ Throttle position sensor voltage: 1.37 volts or more.
^ Primary pulley speed: 1,000 r/min or more.
^ The absolute value of the Primary pulley speed - secondary pulley speed: 1,000 r/min or less.
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.
Judgment Criteria
^ Engine revolution [primary pulley speed: 1,000 r/min or more]: less than 450 r/min.
^ The difference of engine speed and primary speed: more than 1,000 r/min. (5 seconds)
^ The difference of engine speed and secondary speed: more than 1,000 r/min. (5 seconds)
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
^ Malfunction of the CAN bus
^ Malfunction of the engine system
^ Malfunction of TCM
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Go to "CAN Troubleshooting."
STEP 2. M.U.T.-III diagnosis code
Check if the engine-related diagnosis code is set.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Go to "Engine Troubleshooting."
STEP 3. Symptom recheck after erasing diagnosis code
Q: Is the check result normal?
YES: Intermittent malfunction
NO: Replace TCM.