P1723

DTC P1723: Abnormality in Speed Sensor System Function

















DIAGNOSTIC FUNCTION
TCM detects the abnormal wave pattern of the speed sensor signal.

DESCRIPTIONS OF MONITOR METHODS
^ Rotational fluctuation of primary pulley is large (for 1 second).
^ Rotational fluctuation of secondary pulley is large (for 1 second).

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)
^ P0741: Abnormality in lockup function
^ P0746: Abnormality in hydraulic control system function
^ P0841: Abnormality in line pressure sensor function
^ P0868: Secondary pressure drop

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

LOGIC FLOW CHARTS (Monitor Sequence)

Logic Flow Charts (Monitor Sequence):

DTC SET CONDITIONS

Check Conditions
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.
^ Transmission range switch: normal.
^ Secondary pulley speed sensor: normal.
^ Primary pulley speed sensor: normal.
^ Primary or secondary pressure sensor performance: normal.

Judgement Criteria
^ High frequency of primary speed sensor: more than 30 r/min. (1 second)
^ High frequency of secondary speed sensor: more than 30 r/min. (1 second)

OBD-II DRIVE CYCLE PATTERN
All the conditions below continue for 6 seconds.
^ Transmission range switch: D
^ Vehicle speed: 10 km/h (6.2 mph) or more
^ Throttle position: 1/8 or more
^ Engine speed: 450 r/min or more
^ Transmission fluid temperature: 20°C (68°F) or more.
^ Transmission fluid temperature: 99°C (210°F) or more.

PROBABLE CAUSES
^ Malfunction of primary pulley speed sensor
^ Malfunction of secondary pulley speed sensor
^ Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Check the following connector:
^ C-40 TCM connector
^ B-07 Primary pulley speed sensor connector
^ B-113 Secondary pulley speed sensor connector

Check for the connection with terminals.

Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the defective connector.

STEP 2. Use an oscilloscope to measure the wave patterns of the primary pulley speed sensor and secondary pulley speed sensor.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Replace the primary pulley speed sensor or secondary pulley speed sensor.

STEP 3. Symptom recheck after erasing diagnosis code

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Replace TCM.