How To Use; Hooking-Up The Afm1000 - ECM afm1000 Instruction Manual

How to Use

Hooking-up the AFM1000

Location of the UEGO Sensor
The UEGO sensor should be located approximately 12" from the exhaust valve(s) of the
engine. A location further from the engine may be used as long as it is at least ten times the
exhaust pipe diameter upstream of the end of the exhaust system. For example, with a 2 1/2"
diameter exhaust pipe, the sensor should be at least 25" upstream of the end of the exhaust.
The problem with locations further downstream than ten diameters is that air may be trapped
in the exhaust giving leaner than actual readings. This especially occurs at low exhaust
flowrates. UEGO sensor mounting locations far from the engine expose the sensor to more
liquid water during start-up and should be avoided.
When choosing a UEGO sensor location, take into consideration engine movement, ground
clearance, and wire harness routing.
Install the UEGO sensor by lightly coating its threads with a non-lead containing antiseize
compound and tighten it to 30 ±3 ft-lbf (40 ±4 Nm). Attach the sensor to the wiring harness
and route the harness to the control module. Use cable ties to keep the harness away from
hot or moving objects and ignition wires.
Do not modify the wiring harness and replace it if it is damaged.
Installation of the Sensor Mounting Boss
The UEGO sensor is mounted in the engine's exhaust by threading it into a M18X1.5mm
boss that is cast, welded, or brazed onto the engine's exhaust pipe. This thread size is
identical to that of most exhaust oxygen sensors (O sensors) used in production automobiles
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with 3-way exhaust catalysts.
The sensor boss provided has a M18X1.5mm thread. To mount the boss, first drill a 3/4"
diameter hole in the desired location. Wire-brush the area around the hole and clamp the
boss over the hole. Do not mount the sensor where liquid inside the exhaust may collect in
the sensor or its threads. Weld or braze the boss to the exhaust pipe. After the boss is
attached to the exhaust, tap the treads to clean them and file the top of the boss to provide a
flat surface for sealing. When the UEGO sensor is not being used, use the supplied plug
(with some anti-seize) to plug the hole. Do not use the UEGO sensor to plug the hole when
the control module is not being used.
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