Haltech E6M - Manual (Page 142)

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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 E6M using an oscilloscope.
A Motronic wheel often has 60 teeth of which two teeth are missing which will often
give a larger signal. The input to the E6M 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 coil) 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).