DTC 4

DTC 4 - "CODE 4. ECU FAILURE"

CIRCUIT DESCRIPTION
This DTC is output when there is a failure in the telephone ECU (Mayday ECU). In this case, replace the telephone ECU (Mayday ECU).


INSPECTION PROCEDURE
REPLACE TELEPHONE ECU ASSY (MAYDAY ECU)

HINT: If DTC is not cleared even through the Mayday ECU is replaced, replace the Mayday Assembly (Transceiver, Back-up battery, Bus buffer ECU and Mayday ECU)