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)





DTC SET CONDITIONS

Check Conditions
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.

Judgment Criteria
^ Noise of primary pulley or primary pulley speed sensor signal: more than 30 r/min. (1 second)
^ Noise of primary pulley or secondary pulley speed sensor signal: more than 30 r/min. (1 second)

OBD-II DRIVE CYCLE PATTERN
Ignition switch : ON (start the engine and keep it for 10 seconds 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.
Refer to Oscilloscope Patterns and Waveforms.
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.