Code No. 23 Engine-ECU and Its Related Components


DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the MPI system.
  • Malfunction of the engine-ECU.

DIAGNOSIS PROCEDURE

STEP 1. Check the MPI system diagnosis code.
Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13B - Troubleshooting, Diagnosis Function ) <4B10> or (Refer to GROUP 13C - Troubleshooting, Diagnosis Function ) <4B11-Turbo>.

Q. Is any diagnosis code set?
Repair the MPI system (Refer to GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <4B10> or (Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Trouble Code ) <4B11-Turbo>. Then go to Step 3.
Go to Step 2.

STEP 2. Read the diagnosis code.
(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
(2)Connect the negative battery cable.
(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).
(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 ).

Q. Is diagnosis code No.23 set?
Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU ) <4B10> or (Refer to GROUP 13C - Engine-ECU ) <4B11-Turbo>. When the Engine-ECU is replaced, register the encrypted code (Refer to GROUP 42C - Troubleshooting, ID Code Registration Necessity Judgment Table ). Then go to Step 3.
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 ).

STEP 3. Read the diagnosis code.
(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
(2)Connect the negative battery cable.
(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).
(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 ).

Q. Is diagnosis code No.23 set?
Return to Step 1.
This procedure is complete.