Code No. 23 Engine-A/T-ECU and Its Related Components.


DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the MPI system.
  • Malfunction of the engine-A/T-ECU.

DIAGNOSIS PROCEDURE

STEP 1. Check the MPI system diagnosis code.
Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13A - Troubleshooting, Diagnosis Function .)

Q. Is any diagnosis code set?
Repair the MPI system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code .) 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 terminal.
(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-A/T-ECU (Refer to GROUP 13A - Engine-A/T-ECU .) 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 Malfunctions .)

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 terminal.
(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.