Inspection Procedure
6: ABS warning lamp stays ON after the engine is started.
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caution |
- If
there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to
this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C -
CAN Bus Diagnostics
Table
).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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- ASC-ECU sends the illumination request signal of the ABS warning lamp to
the combination meter through ETACS-ECU via CAN communication.
- ASC-ECU illuminates the ABS warning lamp via ETACS-ECU for approximately 3 seconds
for valve check with the ignition switch turned to the ON position.
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COMMENTS ON TROUBLE SYMPTOM
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This may be caused by faults in the CAN bus line, ETACS-ECU, combination meter or ASC-ECU.
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- Damaged wiring harness and connectors
- Malfunction of ETACS-ECU
- Combination meter malfunction
- ASC-ECU malfunction
- Control stop due to the low voltage
note |
Due to the abnormality in the supply voltage, the diagnosis code may not be set even when
the ABS warning lamp is illuminated.
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the CAN bus lines (Refer to GROUP 54C -
CAN Bus Diagnostics Table ).
Then go to Step 7.
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STEP 2. M.U.T.-III diagnosis code
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Use M.U.T.-III to check the diagnosis code for the ASC system.
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Q.
Is the diagnosis code set?
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Carry out the diagnosis for the diagnosis code (Refer to ).
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Go to Step 3.
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STEP 3. Check the ASC-ECU power supply circuit system.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 4.
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Diagnose the power supply circuit of the ASC-ECU (Refer to ).
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STEP 4. M.U.T.-III other system diagnosis code
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Using M.U.T.-III, check that diagnosis code No.U0141 is not set by the combination meter
system.
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Q.
Is the diagnosis code set?
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Diagnose the combination meter (Refer to GROUP 54A -
Combination Meter/Diagnosis
Code ). Then go to Step 7.
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Go to Step 5.
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STEP 5. M.U.T.-III other system diagnosis code
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Using M.U.T.-III, check that diagnosis code No.U0121 is not set by the ETACS system.
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Q.
Is the diagnosis code set?
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Perform troubleshooting on ETACS-ECU (Refer to GROUP 54A -
ETACS/Diagnosis
Code ). Then go to Step 7.
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Go to Step 6
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STEP 6. Retest the system.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 10 km/h or higher.
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Q.
Does the ABS warning lamp turn ON and OFF normally?
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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ),
and then go to Step 7.
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STEP 7. Retest the system.
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(1)Erase the diagnosis code.
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(2)Drive the vehicle at 10 km/h or higher.
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Q.
Does the ABS warning lamp turn ON and OFF normally?
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This diagnosis is complete.
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Return to Step 1.
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