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DTC P0720: Output Shaft Speed Sensor System
 
 
 
 
DESCRIPTIONS OF MONITOR METHODS
With the vehicle speed more than 20 km/h (12.4 mph), when the vehicle speed is decelerated by 20 km/h (12.4 mph) or more in 0.05 second.
 
 
MONITOR EXECUTION
  • Vehicle speed 20 km/h (12.4 mph) or more.
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • P0712, P0713: Transmission fluid temperature sensor
  • P0731: 1st gear incorrect ratio
  • P0732: 2nd gear incorrect ratio
  • P0733: 3rd gear incorrect ratio
  • P0734: 4th gear incorrect ratio
  • P0735: 5th gear incorrect ratio
  • P0729: 6th gear incorrect ratio
  • P0736: Reverse gear incorrect ratio
  • P0742: Torque converter clutch system (Stuck on)
  • P0846: 2-6 brake pressure switch system
  • P0876: High clutch pressure switch system
  • P0893: Interlock detection
  • P0988: Low-reverse brake pressure switch system
  • U0001: CAN bus off
Sensor (The sensor below is determined to be normal)
  • Transmission fluid temperature sensor
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Vehicle speed: 20 km/h (12.4 mph) or more.
  • Vehicle speed signal from ABS: more than -20 km/h (-12.4 mph)/0.05 second.
Judgment Criteria
  • Rapid vehicle speed change: -20 km/h (-12.4 mph)/0.05 second or less. (2.5 seconds)
Check Conditions
  • Vehicle speed signal from ABS: 20 km/h (12.4 mph) or more.
Judgment Criteria
  • Vehicle speed: 5 km/h (3.1 mph) or less. (2 seconds)
 
 
OBD-II DRIVE CYCLE PATTERN
Drive with the vehicle speed 20 km/h (12.4 mph).
 
 
PROBABLE CAUSES
  • Malfunction of the output shaft speed sensor system circuit
  • Damaged harness or connector
  • Malfunction of the output shaft speed sensor
  • Malfunction of the TCM
  • Malfunction of the output shaft speed sensor rotor (A/T assembly)

 
 
DIAGNOSIS
STEP 1. Check the TCM terminal voltage and frequency.
[TCM connector (harness side, connected)]
Check that the voltage between PGB- terminal and GND1 or GND2 terminal is 0 V, and then check the frequency of PGB1 terminal.
  • At D range, vehicle speed is 30 km/h (18.6 mph): Approx. 588 Hz
Is the check result normal?
Go to Step 6.
Go to Step 2.
 
STEP 2. Check the power supply and sensor ground.
[Output shaft speed sensor connector (harness side, disconnected)]
  • With the ignition switch ON: Power supply terminal to ground terminal → Battery positive voltage
Is the check result normal?
Go to Step 3.
Go to Step 4.
 
STEP 3. Check for continuity in PGB1 line between the input shaft speed sensor connector and TCM connector.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Is the check result normal?
Replace the output shaft speed sensor with the one of the same transaxle of the same model. Then go to Step 7.
Repair the connector(s) or wiring harness, and then go to Step 6.
 
STEP 4. Check the path between the battery and the output shaft speed sensor.
  • Check the power supply line for an open/short circuit between the battery and output shaft speed sensor connector.
  • Check for a blown fuse.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check for continuity in PGB- line between the input shaft speed sensor connector and TCM connector.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
 
STEP 6. 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.
 
STEP 7. After replacing the output shaft speed sensor, drive the vehicle for a while, and then check the DTC again.
Is the check result normal?
Replace the output shaft speed sensor.
Replace the TCM. Than go to Step 9.
 
STEP 8. 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 9. DTC recheck.
  1. Erase the DTC.
  2. Drive the vehicle at 20 km/h (12.4 mph) or more.
  3. Check if the DTC is set.
Is the DTC set?
Remove the A/T. Carry out the internal check and repair the defective part (the output shaft speed sensor rotor may be defective).
The procedure is complete.