CODE NO. P1574: Engine-ECU and Its Related Components


DIAGNOSIS CODE SET CONDITIONS


This diagnosis code is set when there is an failure in the engine-ECU and its related components.

PROBABLE CAUSES



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 <4B1>, GROUP 13C - Troubleshooting, Diagnosis Function <4J1>).

Q. Is any diagnosis code set?
Repair the MPI system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code <4B1>, GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Code <4J1>). Then go to Step 3.
Go to Step 2.

STEP 2. Read the diagnosis code.
(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control indicator lamp <standard meter> or the cruise control display screen <high contrast meter> is turned on).
(3)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. P1574 set?
Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU <4B1>, GROUP 13C - Engine-ECU <4J1>). 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)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control indicator lamp <standard meter> or the cruise control display screen <high contrast meter> is turned on).
(3)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. P1574 set?
Return to Step 1.
This procedure is complete.