Output Wiring
45
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Six-terminal ISC Stepper Motor
8.5
Tachometer
An auxiliary output configured as 'Tacho' produces a 0-12V pulse to drive a low-level
tachometer. There will be one output pulse for each time a cylinder reaches TDC. Connect
an Auxiliary Output directly to a low-level tachometer.
G4 ECU's will NOT drive a high-level tachometer. High-level tachometers must be triggered
by a coil’s negative terminal. Using a high-level tachometer on a multi-coil engine presents
some problems, as each coil is not firing as often as a distributor engine’s coil would. In this
case the preferred solution is to modify the high-level tachometer to accept a low-level
signal.
8.6
Variable Valve Timing (VVT) Solenoids
Continuously Variable Valve timing (CVVT, VVT, VVTi, AVCS) Cam Position solenoids can
only be connected to Auxiliary Outputs 1 to 4.
It is recommended to ease configuration that cam position control solenoids are wired to the
same number Auxiliary Output channel as the corresponding cam position Digital Input
(refer following example).
Although not absolutely necessary, it is recommended to ease configuration that cam
position signals are wired to the same number Digital Input channel as the corresponding
solenoid control Auxiliary Output (refer following table).
For compatibility, the following use of Digital Inputs and Auxiliary outputs is recommended
for VVT wiring. Note that in practice any Digital Input/Auxiliary Output combination can be
used.
Cam Shaft
Digital Input
Auxiliary Output
Inlet or Inlet LH
DI 1
Aux 1