CODE NO. P1566: Engine - ACC/FCM Control State Mismatch <ACC>
caution
If diagnosis code NO. P1566 is set from engine-ECU, surely perform CAN bus line diagnosis.
caution
Replace ECU after certainly confirming that the communication circuits are normal.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality below is detected:
ACC-related information does not meet a predetermined value.
More than 2 seconds have passed since the ignition switch was turned to "ON" position.
PROBABLE CAUSES
Failed harness and connector
Failed ACC/FCM-ECU
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to perform CAN bus line diagnosis.
Q.
Is the check result normal?
Go to Step 2
Repair CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ). After repairing CAN bus line, go to Step 5.
STEP 2. M.U.T.-III diagnosis code
Confirm the diagnosis code is set from the ACC/FCM-ECU.
Q.
Is diagnosis code set?
Perform troubleshooting of the adaptive cruise control system (ACC) (Refer to Troubleshooting - Diagnosis Code Chart ).
Go to Step 3
STEP 3. Check the MPI system diagnosis code.
Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13C - Troubleshooting, Diagnosis Function ).
Q.
Is any diagnosis code set?
Repair the MPI system (Refer to GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Code ). Then go to Step 5.
Go to Step 4
STEP 4. 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 ACC ON/OFF switch to turn the cruise control system to ON (the cruise control display screen 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. P1566 set?
Replace the engine-ECU (Refer to GROUP 13C - Engine-ECU ). Then go to Step 5.
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 5. 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 ACC ON/OFF switch to turn the cruise control system to ON (the cruise control display screen 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 ).