P0720
DTC P0720: Malfunction of Secondary Pulley Speed SensorSECONDARY PULLEY SPEED SENSOR SYSTEM CIRCUIT
DIAGNOSTIC FUNCTION
TCM determines that the malfunction is present when the secondary pulley speed sensor value changes abruptly or when there is a discrepancy between this sensor and other sensors in sensor reading.
DESCRIPTIONS OF MONITOR METHODS
^ The status with the primary pulley speed of 1,000 r/min or more and with the secondary pulley speed of 150 r/min or less continues for 5 seconds.
^ When the vehicle speed computed by CVT has dropped abruptly from 10 km/h (6.2 mph) or more to 5 km/h (3.1 mph) or less, and then the computing value keeps 5 km/h (3.1 mph) or less for 0.5 seconds continuously.
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
^ P0712: P0713: Malfunction of the transmission fluid temperature sensor
^ P0715: Malfunction of primary pulley speed sensor
^ P0725: Malfunction of engine speed
^ 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
^ P1723: Abnormality in speed sensor system function
Sensor (The sensor below is determined to be normal)
^ Transmission range switch
^ Transmission fluid temperature sensor
^ 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.
^ Secondary pulley speed at 10 millisecond before: 500 r/min or more.
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.
Judgment Criteria
^ Secondary pulley speed [primary pulley speed: 1,000 r/min or more]: 150 r/min or less. (5 seconds)
^ Secondary pulley speed [secondary speed at 10 millisecond before: 500 r/min or more]: 260 r/min or less. (0.5 second)
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 secondary pulley speed sensor
^ Damaged wiring harness and connectors
^ Malfunction of TCM
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III data list
Item 2: Secondary speed sensor signal.
Q: Is the check result normal?
YES: Intermittent malfunction
NO: Go to Step 2.
STEP 2. Check the following connector:
^ C-40 TCM connector
^ B-113 Secondary pulley speed sensor connector
^ A-10 Intermediate connector
Check the terminals for a contact status problem and internal short circuit.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the defective connector.
STEP 3. Check for open circuit in the wiring harness between the secondary pulley speed sensor connector and the TCM connector.
Between B-113 secondary pulley speed sensor connector (terminal No.3) and C-40 TCM connector (terminal No.48)
Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair the wiring harness.
STEP 4. Check for open circuit and short to ground in the wiring harness between the secondary pulley speed sensor connector and the TCM connector
Between B-113 secondary pulley speed sensor connector (terminal No.2) and C-40 TCM connector (terminal No.36)
Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair the wiring harness.
STEP 5. Check for open circuit in the wiring harness between the CVT control relay and the secondary pulley speed sensor connector.
Between A-15X CVT control relay (terminal No.3) and B113 secondary pulley speed sensor connector (terminal No. 1)
Q: Is the check result normal?
YES: Go to Step 6.
NO: Repair the wiring harness.
STEP 6. Secondary pulley speed sensor check
Visually check the tip of the sensor for foreign materials or damage.
Q: Is the check result normal?
YES: Go to Step 7.
NO: Repair.
STEP 7. Diagnosis code recheck after replacing the secondary pulley speed sensor
Q: Is the check result normal?
YES: The procedure is complete.
NO: Replace TCM.