8
9
IGNITION AND INJECTION
WARNING!
Connecting the VCU to an ignition module before
setting the ignition firing edge correctly may
damage the module and coils, therefore it is
advised to disconnect the module or disable the
power to the ignition system until the unit has
been setup and configured.
IGN 1
IGN 4
IGN 2
IGN 3
IGN 5
IGN 8
IGN 6
IGN 7
25A-
HCO2
8-CYL DIRECT FIRE IGNITION
1
3
5
7
2
4
6
8
(WIRE AS PER CYLINDER ORDER)
NOTE: The coils (HT-020102) depicted in this diagram
have internal igniters. Do not connect ignition
outputs directly to coils unless they have internal
igniters as this will damage the VCU. If your coils are
without internal igniters an external ignitor module
must be used.
Ignition Outputs
Ignition outputs are used to control the ignition
system of the engine. The ignition outputs can be
connected directly to ignition coils only if the coils
are equipped with internal igniters.
Ignition coils without internal igniters draw large
amounts of current and thus must use an external
igniter module to be safely triggered by the VCU’s
ignition outputs. Connecting directly to a coil
without internal igniters will damage the VCU.
Specs
:
• Number of channels: 8
• Software selectable global 12V or
5V pull-up voltage
• Software selectable individual 270R pull-up enable
• Flyback protected
• 3A sink current
• 10kHz switching speed
• Automatic overtemperature / overcurrent
protection
• 0 to 27V voltage feedback
Unused ignition outputs can also be used as:
• Generic switched (3A sink) or PWM outputs
• Low speed digital switch inputs (0-12V)
Injector Outputs
All injectors are to be wired directly to the ECU’s
corresponding cylinder output pins and must be
wired to a 12V supply from one of the 25
Amp high current outputs on the Nexus R3.
When not used for injector control, the spare
injector outputs can be used as generic digital
pulsed outputs (DPO) capable of switching to
ground or pulse width modulation (PWM).
Specs:
• Number of channels: 8
• Current controlled output
• 8A Peak, 2A Hold
• 0 to 55V voltage feedback
Unused injector outputs can also be used as:
• Generic switched or PWM outputs (2A)
• Low speed digital switch inputs (0-12V)
INJ 1
INJ 4
INJ 2
INJ 3
INJ 5
INJ 8
INJ 6
INJ 7
25A-
HCO1
8-CYL
INJECTION
SEQUENTIAL
1
3
5
7
2
4
6
8
(WIRE AS PER CYLINDER ORDER)
IGN 1
25A-
HCO2
IGNITER
IGNITION COIL
WITH NO
INTERNAL
IGNITER
(REQUIRED)
IGN 2
+12V (SWITCHED)
86
85
30
87
SPARE IGNITION OUTPUT
USED AS DPO
IGN 8
+12V BATTERY (FUSED)
INJ 1
INJ 4
INJ 2
INJ 3
INJ 5
INJ 8
INJ 6
INJ 7
25A-
HCO1
4-CYL TWO STAGE INJECTION
P1
P3
S1
S3
P2
P4
S2
S4
INJ 8
SPARE INJECTOR OUTPUT
BOOST
CONTROL
SOLENOID
BOOST
CONTROL
SOLENOID
+12V
SWITCHED
USED AS DPO
BOOST SOLENOID
Wideband O2 Sensor
The Nexus R3 provides on-board wideband O2
sensor control and directly connects to Haltech
Bosch or NTK wideband O2 sensor kits using the
DTM-6 Wideband plug fitted in the harness. Adding
a wideband lambda sensor is recommended to
properly tune the engine for fuel and enables the
VCU to use features such as closed loop O2 control.
Haltech wideband O2 sensor kits (sold separately):
HT-010746 - Bosch LSU4.9 wideband sensor
HT-010747 - NTK LZA08-H5 wideband sensor
