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 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

NOTE:

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.