Ignition Off, Function - GF07.10-P-1002OLF

ENGINE 651.9 in MODEL 166 as of model year 2016 

Function requirements for ignition OFF, general points 

• Circuit 87M (engine management ON)
• Terminal 15

Ignition OFF, general points 

With ignition OFF, first the engine and then the engine management are switched off in the CDI control unit (N3/9).

Function sequence for ignition OFF 

With ignition OFF, the electronic ignition lock control unit (N73) switches off the circuit 15 relay (F58kR) via interior CAN (CAN B) and via SAM control unit (N10). The "circuit 15 OFF" signal is forwarded redundantly via chassis CAN E1 (CAN E1) to the CDI control unit.

If the CDI control unit receives the "Circuit 15 OFF" signal over circuit 15 relay, the following components will be switched off and the processor power-down is started:

• The fuel pump (M3) via the drive train CAN (CAN C) and FSCU (N118)
• Pressure regulating valve (Y74)
• Fuel injectors (Y76)
• Quantity control valve (Y94)

Ground connection "circuit 31" takes place by the on-board electrical system battery (G1) over the on-board electrical system battery ground point at the front right (W10) and over a number of ground lines to the ground point on the front right for the lamp unit (W2).

When the ignition is OFF, the CDI control unit is supplied with power from the on-board electrical system battery via "circuit 30 fused".

When the computer run-on is complete, the circuit relay 87M (F58kN) is switched off and the engine management is disconnected from the on-board electrical system (switched off).

Information for partial function "no-load current shutoff" is documented in the function description "Engine OFF energy management function".

On vehicles with code (U77) BlueTEC (SCR) diesel exhaust treatment, the AdBlue® control unit (N118/5) power-down is started. The AdBlue® delivery pump (A103/2m1) sucks the remaining AdBlue® reduction agent out of the AdBlue® pressure line over the AdBlue® extraction pump (A103/2m2) actuated by the AdBlue® control unit during the control unit power-down. The AdBlue® metering valve (Y129) is opened at the same time so that no vacuum arises in the AdBlue® pressure line. The duration of the run-on and the timing of the reduction agent return are dependent on the exhaust temperature as detected by the temperature sensor upstream of the SCR catalytic converter (B16/15) since excessively hot exhaust can damage the AdBlue® pressure line and other system components.

	Electrical function schematic for ignition OFF		PE07.10-P-2702-97NBF
	Overview of system components for common rail diesel injection (CDI)		GF07.16-P-9997OLF