Table of Contents
Advertisement
Power
The AFM1000 requires clean DC power of 11 to 28V at 1.4A (steady-state). During sensor
warm-up, the requirements are approximately 5A for a period of up to 1 minute. A good car
or motorcycle 12V battery can meet these specifications.
An AC/DC power supply is
available (P/N 1000A-7). The supplied wiring harness must be connected directly to the
power source. Do not modify the wiring harness.
Warm-up
After powering-up the AFM1000, it will take less than one minute for the control module to
bring the UEGO sensor to its operating temperature. It is okay to have the engine running
during this period. It fact it is recommended that a cold engine be started before the
AFM1000 is powered-up. The reason for this is to allow any condensed water to be cleared
from the exhaust system. Water can thermally shock the UEGO sensor.
Analog Output
The AFM1000 has a 0V to 5V linearized output suitable for input into a data acquisition or
engine control system.
1
The relationship between the analog output (Vout) and the AFR for gasoline
is:
AFR = 2.0 x Vout + 8.0 (for gasoline only)
For example, if Vout is 1 V then the AFR is 10:1.
The analog output is available from the female BNC connector on the wiring harness. The
shell of the connector is signal ground and it is electrically connected to the power source
ground.
When the AFM1000 is first turned on, the output passes through a sequence of three voltages
(0.0V (8.0 AFR), 3.28V (14.56 AFR), 5.00V (18.0 AFR)). Each voltage is held for five
seconds. The purpose of this sequence is to verify correct electrical connection and signal
conversion with the AFM1000 and the data receiving device.
Calibration
Calibration of the AFM1000 and the UEGO sensor requires that the sensor be held in air (not
in the exhaust even with the engine off) for 3 minutes following power-up. To bring the unit
into calibration, adjust the calibration potentiometer (CAL POT) on the top of the control
module using the calibration screwdriver provided.
The screwdriver must be inserted
approximately ½" inside the unit to reach the potentiometer. First turn the potentiometer to
1
Assumes fuel H:C ratio of 1.85. For other fuels see the "Fuel Type Compensation" section.
4
Advertisement
Table of Contents
