CODE NO. P1574: Engine-ECU and Its Related Components
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is stored when there is an failure in the engine-ECU and its related components.
PROBABLE CAUSES
- Malfunction of the MPI system.
- Malfunction of the engine-ECU.
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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 13A - Troubleshooting, Diagnosis Function  <4B1>, GROUP 13B - Troubleshooting, Diagnosis Function <6B3>).
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Q.
Is any diagnosis code stored?
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 Repair the MPI system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code <4B1>, GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Code <6B3>). 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)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
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(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).
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(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 ).
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Q.
Is diagnosis code No. P1574 stored?
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Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU <4B1>, GROUP 13B - 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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STEP 3. Read the diagnosis code.
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(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
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(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).
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(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 ).
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Q.
Is diagnosis code No. P1574 stored?
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Return to Step 1.
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This procedure is complete.
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