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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?

	Intermittent malfunction

	Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnosis Code Chart ).