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DTC U0101: TCM
Time-out
| caution |
- If the ECM output the
DTC U0101, make sure to diagnose the CAN bus line.
- Before replacing the ECU, make sure that the communication circuit is operating
normally.
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DESCRIPTIONS OF MONITOR METHODS
There is no data from TCM for the specified time. (Meter
also detect communication error with ECM.)
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Lgic Flow Chart
Check Condition
- Battery positive voltage is between 10 and 16.5 volts.
Judgement Criterion
- Unable to receive TCM signals through the CAN bus line for 4 seconds.
COMMENT
Current Trouble
- Some of the possible causes are a harness or connector damage between the ECM and
the TCM on the CAN bus line, a failure in the TCM power supply system, a failure in the TCM,
or a failure in the ECM.
Past Trouble
- Proceed to troubleshoot based on a harness or connector damage on the CAN bus line
between the ECM and TCM, and a failure in the TCM power supply system. Refer to "How to cope
with past trouble" (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How
to Treat Past Trouble
).
| note |
If a malfunction occurred in the past, a failure cannot be discovered through the M.U.T. - III CAN
bus diagnosis even if there might be a problem with the CAN bus. In this case, refer to GROUP
00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Furthermore, it is possible to narrow down the areas of the possible failures from the DTCs
that are output by the ECUs, which are communicating on the CAN bus [Refer to GROUP 54C,
Explanation about the Scan Tool (M.U.T-III) CAN Bus Diagnostics ].
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OBD-II DRIVE CYCLE PATTERN
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- CAN line harness damage or connector damage.
- TCM failed.
- ECM failed.
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Required Special Tools:
- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
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STEP 1. Using scan tool MB991958, diagnose CAN bus line.
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| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
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(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the CAN bus line normal?
 Go to Step 2.
 Repair the CAN bus line. Refer to GROUP 54C, Can Bus Diagnostics Table .
Then go to Step 6.
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STEP 2. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
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(1)Turn the ignition switch to the "ON" position.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Refer to GROUP 23A, Diagnosis - Diagnostic Trouble Code Chart .
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Go to Step 3.
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STEP 3. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
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(1)Turn the ignition switch to the "ON" position.
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(2)Read the ABS-DTC and ETACS-DTC.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 4.
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Go to Step 5.
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STEP 4. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
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(1)Turn the ignition switch to the "ON" position.
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(2)After the MFI-DTC has been deleted, read the MFI-DTC again.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the TCM. Then go to Step 6.
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It can be assumed that this malfunction is intermittent of CAN bus line between
ECM and TCM. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How
to Cope with Intermittent Malfunctions .
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STEP 5. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
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(1)Turn the ignition switch to the "ON" position.
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(2)After the MFI-DTC has been deleted, read the MFI-DTC again.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis - ID Code Registration Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 6.
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It can be assumed that this malfunction is intermittent of CAN bus line between
ECM and TCM. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How
to Cope with Intermittent Malfunctions .
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STEP 6. Using scan tool MB991958, read the diagnostic trouble code
(DTC).
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(1)Turn the ignition switch to the "ON" position.
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(2)After the MFI-DTC has been deleted, read the MFI-DTC again.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Retry the troubleshooting.
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The inspection is complete.
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)
)