STEP 1. Check the stoplight switch.
STEP 2. Scan tool (M.U.T.-III) actuator test
STEP 3. Check of short to power supply, short to ground, and open circuit in STLD line between ASC-ECU connector and ETACS-ECU connector
STEP 4. Check of short to power supply, short to ground, and open circuit in STP line between ASC-ECU connector and stoplight connector
STEP 5. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.C1801 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 6. This diagnosis is complete.
STEP 6. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is DTC No.C1801 set?
Return to Step 1. This diagnosis is complete.