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Inspection Procedure 16: ACC power auto cut function does not work normally.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
The KOS&OSS-ECU will evaluate the signals from the power supply mode "ACC" and the driver's door switch to determine whether the "ACC" power supply is shut down or not. If this function does not work normally, the input signal or the KOS&OSS-ECU may be defective. Also, "ACC power auto cut time" may be set to "Disable" through customization.
 
 
PROBABLE CAUSES
  • Malfunction of KOS&OSS-ECU
  • External noise interruption in input signal
 
 
DIAGNOSIS
STEP 1. Check of customization function
Use the ETACS-ECU customization function to check whether "ACC power auto cut time" is set to "30 min" or "60 min."
Is the check result normal?
Go to Step 2.
Using the ETACS-ECU customization function, set ACC power auto cut time" to "30 min" or "60 min" (Refer to ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the DTC.
Check if any DTC is set in the KOS&OSS-ECU.
Is the DTC set?
Refer to diagnostic trouble code chart .
Go to Step 3.
 
STEP 3. Voltage measurement at KOS&OSS-ECU connector
Check the voltage measurement at KOS&OSS-ECU connector (Refer to ).
Terminals to be checked
  • STP1
  • SW1
  • SW2
Is the check result normal?
Go to Step 4.
Replace the KOS&OSS-ECU and register the ID codes (Refer to ).
 
STEP 4. Using scan tool (M.U.T.-IIISE), check the data list
Use the KOS&OSS-ECU service data to check the signals related to the ACC power auto cut function.
  • Turn the power supply mode to "ACC."
 
Item No.Check itemNormal conditions
8OSS power supply statusIG ACC
OK: Normal conditions are displayed.
Is the check result normal?
Go to Step 5.
Replace the KOS&OSS-ECU and register the ID codes (Refer to ).
 
STEP 5. Check of the troubles
Check whether the ACC power auto cut function works normally.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the KOS&OSS-ECU and register the ID codes (Refer to ).