GF07.10-P-1002MTC | Ignition OFF, function | 10.5.12 |
ENGINES 270.9 in MODEL 242 with CODE (924) Monovalent natural gas drive
Function requirements for ignition OFF, general points
Circuit 87M (engine control ON)
Circuit 15 (ignition ON)
Ignition OFF, general points
For ignition OFF, first the engine and then the engine timing is switched off in the ME-SFI [ME] control unit (N3/10).
Function sequence for ignition OFF
For ignition OFF the circuit 15 relay (F58kR) is switched off based on the electronic ignition lock control unit (N73) by the SAM control unit (N10) via the interior CAN (CAN B).
If the ME-SFI [ME] control unit receives the "circuit 15 OFF" signal via the circuit 15 relay, the engine is switched off by shutting off the fuel pump (M3), the fuel injectors (Y76) or the gas injection valves gas (Y106) and the ignition coils (T1) are switched off and computer run-on is started.
The CNG control unit (N118/2) receives the signal "Circuit 15 OFF" from the ME-SFI [ME] control unit.
No-load current shutoff
Information for partial function "no-load current shutoff" is documented in the function description "Energy management engine OFF function".
The "circuit 31" ground connection is made from the on-board electrical system battery (G1) over the battery ground point (W10) and over a number of ground lines to the firewall ground point (W11).
When the ignition is OFF, the ME-SFI [ME] control unit is supplied with power from the on-board electrical system battery via "circuit 30 fused".