Continuously Variable Transmission/Transaxle, CVT

DTC U0001: Malfunction of CAN Communication Circuit

DIAGNOSTIC FUNCTION

TCM conducts bus-off detection.

DESCRIPTIONS OF MONITOR METHODS

- TCM cannot receive the periodic communication data.

MONITOR EXECUTION

- When 1.05 seconds have elapsed after TCM started

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- P0703: Malfunction of stoplight switch

- P0705: Malfunction of transmission range switch

- P0715: Malfunction of primary pulley speed sensor

- P0720: Malfunction of secondary 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

- P1773: Malfunction of ABS

- U0100: CAN time-out error (Engine)
Sensor (The sensor below is determined to be normal)

- Stoplight switch

- Transmission range switch

- Primary pulley speed sensor

- Secondary pulley speed sensor

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions

- Time after TCM start: more than 1.05 seconds.

- Voltage of battery: 9 volts or more

- Voltage of battery: 16 volts or less
Judgment Criteria

- CAN communication: fail

OBD-II DRIVE CYCLE PATTERN

Ignition switch : ON (start the engine and keep it for 10 seconds or more)

PROBABLE CAUSES

- Malfunction of the CAN bus

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 Intermittent malfunction
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).