DTC U3EFF-06: Algorithm based failures

DTC SET CONDITIONS

Check Condition

The power supply mode of the electric motor switch is ON.

Judgment Criterion

ECM algorithm is abnormal (ECM update failed).
Failure on microcomputer is detected.

FAIL-SAFE AND BACKUP FUNCTION

READY ON is not possible.

OBD-II DRIVE CYCLE PATTERN

None.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

ECM update data failed.
Updating the ECM with incorrect update data.
ECM failed.
Low 12V battery voltage

note	When the 12V battery voltage is dropped to the level that the jump-start is necessary, this DTC may be set.

DIAGNOSIS

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

1.STEP 1. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.

After erasing the DTC, check again to see if the DTC is set again.

(1) Use scan tool (M.U.T.-III SE) to erase the DTC.

(2) Turn OFF the power supply mode of the electric motor switch.

(3) Turn ON the power supply mode of the electric motor switch.

(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.

Q: Is DTC U3EFF-06 set?

Update the ECM again (Refer to UPDATE ENGINE CONTROL MODULE (ECM)

). Then

note	When the ECM update data cannot be selected, go to Step 2.

Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS

2.STEP 2. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.

After erasing the DTC, check again to see if the DTC is set again.

(1) Use scan tool (M.U.T.-III SE) to erase the DTC.

(2) Turn OFF the power supply mode of the electric motor switch.

(3) Turn ON the power supply mode of the electric motor switch.

(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.

Q: Is DTC U3EFF-06 set?

Perform "Compulsion Boot Test" in "Special function" of ECM (Refer to COMPULSION BOOT TEST

). Then go to

The inspection is complete.

3.STEP 3. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.

After erasing the DTC, check again to see if the DTC is set again.

(1) Use scan tool (M.U.T.-III SE) to erase the DTC.

(2) Turn OFF the power supply mode of the electric motor switch.

(3) Turn ON the power supply mode of the electric motor switch.

(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.

Q: Is DTC U3EFF-06 set?

Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION

The inspection is complete.