Continuously Variable Transmission/Transaxle, CVT

DTC U0100: CAN Time-out Error (Engine)

DIAGNOSTIC FUNCTION

TCM receives periodic communication data from the ECM via CAN bus lines.

DESCRIPTIONS OF MONITOR METHODS

- TCM cannot receive the periodic communication data from the ECM.

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)

- P0725: Malfunction of engine speed
- 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

- 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 with ECM: fail. (500 millisecond)

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
- Engine ECU malfunction
- Malfunction of TCM

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 Go to Step 2.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).
STEP 2. M.U.T.-III diagnostic trouble code

Check if the engine-related diagnostic trouble code is set.

Q. Is the engine-related diagnostic trouble code set?

YES Carry out the appropriate troubleshooting.
NO Go to Step 3.
STEP 3. Symptom recheck after erasing diagnostic trouble code

Q. Is the check result normal?

YES Intermittent malfunction
NO Replace TCM.