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Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13D - Diagnosis Function ) <4B1> or (Refer to GROUP 13C - Diagnosis Function ) <6B3>.
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Q.
Is any diagnosis code set?
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Repair the MPI system (Refer to GROUP 13D - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <4B1> or (Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <6B3>. Then go to Step 3.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON.
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(4)Read the diagnosis code of the cruise control system (Refer to ).
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Q.
Is diagnosis code No. 23 set?
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Replace the engine-ECU (Refer to GROUP 13D - Engine-ECU ) <4B1> or (Refer to GROUP 13C - Engine-ECU ) <6B3>. Then go to Step 3.
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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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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON.
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(4)Read the diagnosis code of the cruise control system (Refer to ).
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Q.
Is diagnosis code No. 23 set?
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This procedure is complete.
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