Service Mode or Mode 2 assists service technicians with the troubleshooting of diagnostic codes All recorded diagnostic codes are shown on the LCD Diagnostic codes can be cleared from memory while in Mode 2.
To enter Mode 2, hold the CLEAR/MODE switch down until-2." appears in the LCD. Three identifiers are used to specify each detected diagnostic code. The identifiers are displayed on the LCD. The six digit readout continuously switches between displaying the Module Identifier(MID) first and the Component Identifier/Failure Mode ldentifier(CID/FMI) second. Identifiers include the following items.
Module Identifier(MID) -The MID is a three digit code shown on the six digit LCD. The MID displays for approximately one second before the CID/FMI is shown in its place. The MID identifies which ECM has generated a diagnostic code The following items are MID's.
Main Display Module........ 030
Primary Engine Control Module... 033 or 034 or 036
Secondary Engine Control Module ...047
De-Nox Control ....076
Customer Communication Module....097
Programmable Relay Control Module.... 099