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. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 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).