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This page describes the power and
various sensor connections to the AFM-1 instrument.1) O2
sensor connection (J11)
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The lambda sensor interface of the AFM-1
instrument uses an eight conductor connector
located at the bottom of the enclosure. The
connector for the Bosch LSU-4 lambda sensor
uses a large 6 conductor connector with a built in
calibration resistor. Micro-Craft offers an
interface cable in several lengths (including
custom order lengths), and a do-it-yourself
connector kit.
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pin-1 : Vref, virtual ground
pin-2 : IPump-out
pin-3 : heater neg
pin-4 : LSU-4 cali
pin-5 : V-sense
pin-6 : heater pos
pin-7 : L1H1 cali
pin-8 : shield ground |
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Interface cable pics (soon I hope)
2) Auxiliary (J9) and power (J7) connections
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The left connector J9 (green) provides
connectivity for the RPM signal, three auxiliary 0
to 5 V inputs, two O2 simulation outputs and
a three wire serial communication interface.
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Auxiliary connector J9, left green
Power connector J7, white right |
The right connector J7 connects the
instrument control pos and ground supply and the
heater pos and ground supply.
J9.1 : RPM in
J9.2 : RPM ground
J9.3 : aux ch-1 in (0-5V)
J9.4 : aux ch-2 in (0-5V)
J9.5 : aux ch-3 in (0-5V)
J9.6 : aux 5V ref out (50 mA max)
J9.7 : aux and sim ground
J9.8 : sim-1 out
J9.9 : sim-2 out
J9.10 : RS232 ground
J9.11 : RS232 TxD, transmit data
J9.12 : RS232 RxD, receive data
J7.1 heater supply ground
J7.2 heater supply pos (10V to 16V, 5 A)
J7.3 control circuit supply ground
J7.4 control circuit supply pos (10V to 16V, 250
mA) |
3) RPM signal connection
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Connect pin 1 of J9 to the primary of the
ignition coil, the terminal which connects to
the points in the distributor or similar
connection on transistorized ignitions. It can
also be connected to any source of crank or cam
position sensor provided the signal meets the
input specs of 12V to 450V. Connect pin
2 of J9 to an engine or chassis ground near the
source of the RPM input signal.
wiring diag missing |
4) Auxiliary 0 to 5 V input signals
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These three input channels connect to J9, pin
3 to 5. J9 pin 7 is the common ground
connection. If a signal connects to a sensor
which is already connected to a stock EFI (i.e.
TPS sensor or MAP sensor), only the signal
connection to the sensor needs to be
established. The common ground should be
connected to the engine or frame ground. If a
dedicated (stand alone) sensor is used, J9 pin 6
provides a 5V reference voltage to power the
sensor. There is a 50 mA max supply current
limit for the 5 V reference signal.
wiring diag missing |
5) Auxiliary -50 to +75 mV input signals
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Up to eight milli-Volt differential inputs
are available on two connectors. The upper
connector for ch-5 to cha-8 shown in the picture
is optional.
The center pin (5) on each connector provides a
ground reference or shield connection.
Each input circuit has 10 k series resistors
with a 0.1 uF filter cap.
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pin-1 : ch-1 pos
pin-2 : ch-1 neg
pin-3 : ch-2 pos
pin-4 : ch-2 neg
pin-5 : ref or shield ground
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pin-6 : ch-3 pos
pin-7 : ch-3 neg
pin-8 : ch-4 pos
pin-9 : ch-4 neg
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differential input voltage range = -50 mV to
+75 mV
common mode range = 2.0V +/- 1.5V
input impedance = 100 k |
6) O2 sensor simulation outputs
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There are two pwm controlled analog outputs. J9 pin 8
is for output-1 and J9 pin 9 is for output-2.
The common ground reference is on J9 pin 7.
Both outputs have a series current limiting
resistor of 100 ohms within the feedback loop of
the op-amp. This means that the output voltage
is precise, except when it reaches near the 5 V
supply or ground level (output current
dependent).
wiring diag missing |
7) Power supply connections
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The AFM-1 instrument is equipped with two
independent power supply connections.
One, to the internal control circuit.The
other to the sensor heater.
more explanation necessary
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