DTC 2-3 Digital Signal Processor Communication Error: DTC 2-4 GPS Communication Error: Description

These DTCs are output when a communication error occurs between the CPU and each interface in the mayday ECU assembly.

DTC DETECTION CONDITION

DTC No.	DTC Detection Condition	Trouble Area
2 - 3	DSP interface communication error in mayday ECU	Mayday ECU assembly
2 - 4	GPS interface communication error in mayday ECU	Mayday ECU assembly

NOTICE:

DTC REFERENCE

Current DTC	Historic DTC only
Disconnect and reconnect battery. Check for current DTCs. If DTC returns, replace mayday ECU and mayday battery (backup battery).	If this is only a historic DTC, the system has already recovered normally and should be operating normally. Clear historic DTCs.

RESET MAYDAY ECU ASSEMBLY

Exit diagnosis mode and wait for 10 seconds.
Disconnect the cable from the negative (-) battery terminal, and wait for 10 minutes.
Reconnect the cable to the negative (-) battery terminal, and wait for 10 seconds.
Turn the ignition switch ON, and then check for the current DTC again.

Result

RESULT REFERENCE

Result	Proceed to
Current DTC 2-3 or 2-4 exists	A
Historic DTC 2-3 or 2-4 exists	B

B: CLEAR HISTORIC DTC

A: REPLACE MAYDAY ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION