Whenever ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
Power is supplied to the EPS-ECU from the ignition switch (IG1).
FUNCTION
The EPS-ECU monitors the voltage supplied from the ignition switch (IG1).
TROUBLE JUDGMENT
Check Conditions
Turn the ignition switch to the "ON" position (Engine running).
Judgment Criterion
When the IG1 voltage is more than 18.5 volts for more than 5 seconds.
note
EPS-ECU voltage can be checked by M.U.T.-IIISE with the following item.
Item No.35: IG voltage
Fail Safe, Back Up Function
The EPS-ECU stops the motor control and illuminates the electric power steering warning light, then sets the DTC.
TROUBLESHOOTING HINTS
Malfunction of the EPS-ECU
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB992006: Extra Fine Probe
Erase the DTC.
Turn the ignition switch from "LOCK" (OFF) to "ON" (Engine running).
If the DTC is not restored, it is intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ). If the DTC is restored, replace the EPS motor (EPS-ECU) (Refer to ).
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). If the DTC is restored, replace the EPS motor (EPS-ECU) (Refer to