MAN #650505b
BIM-13-2
Bus Interface Module for Air/Fuel ratio
(Requires a wide band air/fuel controller with a voltage output)
BIM-xx-2
Power & data connectors
setup/status switch
status light
+12V
KEY ON POWER
(fused 5 - 20 AMP max)
BIM-xx-2 18 inch power/data harness
BIM-xx-1 adapter harness
BLACK WIRE
RED WIRE
Connect to main
chassis ground
To gauge control box
or BIM-xx-1
Connect directly to
another BIM-xx-2
Connect to the BIM-13-2
if you need to connect to a
BIM-xx-2
Connect to the BIM-13-2
if you need to connect to a
BIM-xx-1 or gauge system
BIM-13-2
IN
P
U
T
G
N
D
R
E
F
Connect to analog voltage output
from wide band air/fuel controller.
GND REF will not normally be
connected to anything
Hold wire release button
when inserting or
removing wires
This Bus Interface Module has one input to monitor the air/fuel ratio output from a wide band air/fuel controller with an
analog voltage output. It is programmable to provide either an air/fuel ratio display or a lambda display. The module can
be programmed to work with different scaling values of a voltage between 0 – 5 volts. This allows it to be set for nearly
any wide band system available. There are two interface (I/O) ports on the module. Either one can be connected to the
gauge system or to another module, allowing several units to be daisy chained together. Do not connect the I/O port to
anything other than a Dakota Digital gauge or BIM. Do not mount the module in the engine compartment; it should be
mounted in interior of the vehicle.
Each unit connected to the bus needs a unique ID number assigned to it. The unit comes preset with an ID value that
should not conflict with any other BIM connected to your system. If needed the ID can be automatically reset to an
unused value.
Label for the input is:
AIR/FUEL -
voltage input. This will display A-F, AF, A/F, or AIR/FUEL.
Specs for each input mode are:
(WARN LO)
(WARN HI)
Mode
Range
Resolution
0V setting
5V setting
Air / Fuel
A-F ratio
0 – 5.00 V
0.1
00.0 – 12.6
4.4 – 74.0
Air / Fuel
lambda
0 – 5.00 V
0.01
0.00 – 0.63
1.00 – 5.00
Common LO and HI settings for popular analog output signals:
Consult your wide band air fuel installation and operation manual for details on the type of analog output provided.
Output type
A/F LO
A/F HI
Lambda LO
Lambda HI
10 = 1.0V, 20 = 2.0V
0.0
50.0
0.00
3.40
0 = 0.0V, 50 = 5.0V
0.0
50.0
0.00
3.40
9 = 0.0V, 16 = 5.0V
9.0
16.0
0.61
1.10
7.35 = 0.0V, 22.39 = 5.0V
7.4
22.4
0.50
1.50
Lambda 0.5 = 0.5V, 1.5 = 1.5V 0.0
74.0
0.00
5.00
8.5 = 0.5V, 18 = 4.5V
7.4
19.2
0.50
1.30
Different fuel types will require different scaling values for the air fuel ratios. Consult your wide band air fuel installation
and operation manual for more details on using different fuel types.
