CODE No. U0141
ETACS CAN timeout
caution |
- If diagnosis
code No. U0141 is set in the BSW-ECU (master), always diagnose the CAN bus line.
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit
and the communication circuit are normal.
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OPERATION
The BSW-ECU (master) communicates with the ETACS-ECU via the gateway-ECU and CAN bus lines.
CHECK CONDITION
Ignition switch is in the ON position.
DIAGNOSTIC FUNCTION AND JUDGEMENT CRITERIA
If the BSW-ECU (master) cannot receive any signal from the ETACS-ECU for at least 2.5
seconds, the ECU sets diagnosis code No. U0141.
PROBABLE CAUSES
- Malfunction of ETACS-ECU power supply circuit
- Malfunction of the ETACS-ECU
- Power supply to the gateway-ECU fails
- Malfunction of the gateway-ECU
- Malfunction of the BSW-ECU (master)
- Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code No. U0141 or U1073 is set in the gateway-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the gateway-ECU (Refer to 54C - Troubleshoot <GATEWAY> - Diagnosis
Code Chart
).
Go to Step 3.
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (master).
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the BSW-ECU (master).
The trouble can be an intermittent malfunction such as a poor connection or open
circuit in the CAN bus lines between the ETACS-ECU and the BSW-ECU (master) (GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).