Code No.23: Engine-ECU <M/T> or
engine-A-M/T-ECU <Automated manual transmission> and Its Related Components.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when there is an failure in the engine-ECU <M/T> or
engine-A-M/T-ECU <Automated manual transmission> and its related components.
PROBABLE CAUSES
- Malfunction of the MPI system.
- Malfunction of the engine-ECU <M/T>.
- Malfunction of the engine-A-M/T-ECU <Automated manual transmission>.
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STEP 1. Check the MPI system diagnosis code.
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Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13B - Troubleshooting,
Diagnosis Function  ) <135, 4A9> or (Refer
to GROUP 13C - Troubleshooting, Diagnosis Function ) <4G1>.
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Q.
Is any diagnosis code set?
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 Repair the MPI system (Refer to GROUP 13B - Troubleshooting, Inspection
Chart for Diagnosis Trouble Code ) <135, 4A9> or
(Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <4G1>.
Then go to Step 3.
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 Go to Step 2.
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STEP 2. Read the diagnosis code.
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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 cable.
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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 (turn ON the cruise control indicator lamp).
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(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed
without operating the cruise control switches, 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 <M/T> or engine-A-M/T-ECU <Automated
manual transmission> (Refer to GROUP 13B - Engine-ECU, engine-A-M/T-ECU ) <135,
4A9> or (Refer to GROUP 13C - Engine-ECU ) <4G1>.
When the engine-ECU <M/T> or engine-A-M/T-ECU <Automated manual transmission> is
replaced, register the encrypted code (Refer to GROUP 54A - Ignition Switch, Encrypted
Code Registration Criteria Table ). 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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STEP 3. Read the diagnosis code.
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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 cable.
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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 (turn ON the cruise control indicator lamp).
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(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed
without operating the cruise control switches, 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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Return to Step 1.
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This procedure is complete.
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