Haltech E6K - Manual (Page 137)

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The Motronic magnetic sensor has two wires, one positive (+), and the other negative (-). The
wires are sometimes marked as such, but more often they are not. It is very important that the
positive wire connects to the Input B (Pin D of a fully terminated harness). The negative wire
connects to Trigger input (Pin B on the Trigger Input plug on a fully terminated harness). If
you cannot determine which wire is positive or negative from the marking or wire colour,
then it would be necessary to check the signal going into the E6K using an oscilloscope.
A Motronic wheel more than often has 60 teeth of which two teeth are missing which will
often give a larger signal. The input to the E6K trigger circuit must first go negative (-); when
the signal rises approximately 50 mV a falling edge is generated, and when the signal crosses
zero volts a rising edge is generated. Missing teeth in the Motronic wheel provide a larger
pulse in the output waveform which is recognised by the Haltech ECU as the home position.
Output Signal from the Motronic Sensor
Zero Volts
(Ground)
Output Signal
Zero Volts
(Ground)
If the wires are reversed and the signal goes positive(+) first then the on-board reluctor
adaptor will still generate a pulse but it will not trigger the Haltech correctly resulting in
incorrect ignition timing. So please make sure it is wired correctly.
Note that when using Motronic type sensors it is only necessary to use the Home channel (ie
a separate Home signal to that provided by the missing teeth in the Motronic system) when
using the Sequential mode of operation or when controlling direct fire ignition where 4 coils
are used (including 4 cylinder configurations where one ignition coil per cylinder is used but
excluding 4 cylinder direct fire waste spark where 2 ignition coils are used) and 3 and 5
cylinder applications. The Home channel is independent of the Trigger channel and can use
either reluctor type sensors or Hall effect type sensors.
Wiring a reluctor (magnetic) type Motronic Sensor:
Positive wire: Connect to “Input B” on the Haltech flying wire harness or “Input B” (which is
Pin D, confusing but note the difference, one is an input as shown on the wiring diagram
and the other is a pin number on the plug) of the Trigger input plug of the fully terminated
harness.
Negative wire: Connect to "Trigger" on the Haltech flying wire harness (Pin B on the Trigger
input plug of the fully terminated harness).