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Using M.U.T.-III, perform CAN bus diagnosis (Refer to GROUP 54C - Explanation About The M.U.T-III Can Bus Diagnostics ).
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Q.
Is the check result satisfactory?
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostic Table ). Then go to Step 4.
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Using M.U.T.-III, check the data list (Refer to data list reference table ).
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- Item 74: Stop lamp switch
- Item 89: Brake switch
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Q.
Is the check result normal?
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Check the stop lamp switch system (Refer to - Diagnosis Code Procedures, Code No. P0504: Malfunction of the stop lamp switch system). Then go to Step 4.
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Q.
When the brake pedal is depressed, is the cruise control cancelled?
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
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Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU <4B1>, GROUP 13B - Engine-ECU <6B3>). Then go to Step 4.
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Q.
When the brake pedal is depressed, is the cruise control cancelled?
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The procedure is complete.
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