Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 43
For more information on the DEF system purge operation for the 1204F
product range please refer to section 16 of this document.
4.5.2 1206F DEF System Power Supply Connection
The 1206F product range comes supplied with a DEF control system mounted
to a single plate as part of a PETU (Pump, Electronics, Tank, Unit) or PEU
(Pump, Electronics, Unit). The Supplied unit houses the components required
for DCU power management. The machine system must provide un-switch
battery connection to the 4-way Deutsch connector mounted to the PETU or
PEU as shown below in figure 4.8
Figure 4.8 1206F DEF System Electrical Power Supply Wiring
The un-switched fused battery power supply to the 4-way PETU connector
provides supply to the DEF DCU via a power relay mounted the PEU plate.
The engine ECM then controls the application of the power to the DCU by a
direct connection to the DCU power relay via the 12-way communications
connector and an ignition signal.
Note: The engine ECM may activate the DCU for up to 15 minutes after
the ignition key has been turned off if Delayed Engine Shutdown is
active. During this time Un-switched battery + and negative connections
must be supplied to the DCU.
For more information on the operation and installation requirements for
the delayed engine shutdown feature and the purge cycle please refer to
sections 10 and 16 of this document.
Note: It is important to note that the “optional” Delayed Engine
Shutdown (DES) feature will allow the engine to continue to run for a
minimum of 4 minutes up to a maximum of 15 minutes after the ignition
key is turned OFF. Configuration of the DES feature is described in
section 16.3.1.2 The DES feature should be used in conjunction with a 4
position ignition keyswitch (which allows the operator to override the
DES feature) the function and installation of which is described in
section 16.3.1.3 of this manual.