Arizona Speed Marine by cmk16156


									                    MEFI 3 Closed Loop O2 Control Instructions
                                    (Part # 410-02101)

Thank you for choosing Arizona Speed and Marine for your purchase. Please read
and follow ALL the instructions below. Proper installation will ensure that your
system operates to it’s maximum potential

Note: You need to have working knowledge of hand tools and of the vehicle you
are working on. If you do not feel comfortable with this assumption, it is
recommended that you take the parts and vehicle to a qualified facility for the
installation of these parts. It is recommended you have access to a factory shop
manual for installation. Arizona Speed & Marine, Inc. accepts no responsibility
for improper or faulty installation of the parts, or for the accuracy or omissions in
these instructions.
The oxygen sensor will continuously adjust fuel delivery under partial throttle conditions
to provide preset air / fuel ratios, the result will be reduced emissions and increase fuel
economy. The MEFI 3 ECU is programmed to enable the closed loop functions, the
following modifications are required to wire the sensor to the ECU.

1. Review all contents of your package. (See illustration A) You should have the following:
   2 solderless connectors
   2 shrink tubes
   1 four wire harness (wire colors A=Tan, B=Purple, C=Brown, D=Brown)
   1 O2 Sensor Nut (weld in place threaded lug to mount O2 sensor in exhaust)
   1 Plastic wire conduit
   1 Oxygen sensor (O2 sensor with four wire connector attached)
   1 Instruction sheet

   Illustration A

2. Disconnect your battery.

3. Disconnect the J2 terminal from your ECU. Look for labeling on the wire harness identifying
   the plug J2. (See illustration B)

   Illustration B

4. Using a small screwdriver or awl, open the locking tabs located on the top and sides of the J2
   plug. (See illustration C) Spread the locking wings of the plug to expose the plug terminal
   and pin block. Use care to not damage the locking tabs or any existing wires. Your plug
   should look like illustration D at this time.

   Illustration C                                   Illustration D

5. With a small screwdriver or awl remove the clear pin cover on the front of the J2 plug by
   depressing the white locking tabs on the side. (See illustration E) Use care to not damage the
   locking tabs as you will need to re-use this cover.

   Illustration E

6. Locate the number 3 terminal in the J2 plug (J2-3). (See illustration F) All pin positions on
   the plug are numbered, 1-16 on one side and 17-32 on the other. There are 32 pin positions
   on the J-2 plug. With a small screwdriver release the small locking finger that locks terminal
   3 in place and pull the wire out from the back of the connector.

   Illustration F
7. With the J2-3 wire and terminal now out of the connector you will now need to cut the J2-3
   wire about 1.5” back from the terminal. (See illustration G) Strip the wire back 5/16” on
   both ends of the wire you just cut. (See illustration H)

   Illustration G                                   Illustration H

8. Take the short piece of wire with the terminal on it and crimp one end of a solderless
   connector to it. (See illustration I) (Note: use a crimp tool to ensure proper fit and
   compression, a poor connection will effect the operation of your unit.)

   Illustration I

9. Take the A wire (Tan) from the O2 sensor harness and strip the insulation 5/16” back from
   the end of the wire. Join the A wire with the black J2-3 wire from the main fuel injection
   harness and insert them together into the other end of the solderless connector that you
   crimped to the short wire in Step 7. (See illustration J)

   Illustration J
10. Slip the heat shrink tubing over the solderless connection to cover all exposed wire ends and
    the connector. Using a heat gun (NOT AN OPEN FLAME) heat the shrink tube to seal the
    connection. (See illustration K) Re-insert the pin into the terminal block at the J2-3 port.
    (See illustration L) (Tip: double check this step, if you do not have the A wire from the O2
    plug tied to the J2-3 wire your system will not operate).

   Illustration K                                   Illustration L

11. Locate the J2-6 port. This port should have a small blue insert in place. (See illustration M)
    Remove the insert with a small screwdriver or awl. Use care to not damage the socket. Once
    you have removed the insert in J2-6 port (insert comes out from the back side of the plug)
    insert the B (purple) wire from O2 sensor harness into the J2-6 port. Insert the terminal until
    it locks into place with the front of the terminal even with the existing terminals in the plug.

   Illustration M
12. You are now ready to close the back of the plug and re-install the clear pin protector on the
    front of the connector. At this point your J2 plug should look like illustration O.

   Illustration 0

13. Locate the C (Brown) wire on the O2 sensor harness that has no terminal on the end.. This
    wire needs to be connected to a SWITCHED 12-volt source. (NOTE: a continuous 12 volt
    supply will cause the unit to over heat and will drain your battery.) You need to connect this
    wire to a source that is energized when the key is switched to on and goes off when the key
    switch is in the off position.

14. Locate Terminal D on the O2 sensor plug. This connection is the ground and will have a
    large solderless loop connector on it. Ensure that this wire is secured to a ground. A poor
    ground will cause your unit to malfunction. (NOTE: poor grounding is the number one
    troubleshooting issues we see on any electrical system.)

15. Weld the O2 sensor nut into your exhaust system. (NOTE: you may choose to have this done
    by a professional installer as it will require some fabrication skills such as welding drilling
    etc). Locate a suitable position in your exhaust system, preferably after the four cylinder
    tubes tie together in the collector. (See illustration P) (NOTE: do not install sensor down
    stream of any catalytic converters or mufflers. Leaks upstream of the sensor around flanges or
    slip joints will effect the results.) Sensor should be as close to the collector position as
    possible for best results. Drill a ¾” hole in the upper half of the collector piping. (See
    illustration Q) (TIP: check for clearance issues. The O2 sensor will be threaded into the O2
    sensor nut and will stand up off the pipe about 2.5”)

   Illustration P                                    Illustration Q
16. Weld the O2 sensor nut in place on the collector pipe. (See illustration R) Use caution to
    ensure you do not damage threads and center the hole so that the O2 sensor head can be
    inserted into the exhaust flow. (See illustration S)

   Illustration R                                    Illustration S

17. Install the O2 sensor into the O2 sensor nut and connect the 4 wire plug from your ECU.
    (See illustration S) (NOTE: You sent us your ECU to be re-calibrated to use the information
    from the O2 sensor, so now is a good time to re-install your ECU) Reconnect your battery.

   Illustration S
   Note: The oxygen sensor has a heating element that is activated when the ignition
   switch is turned on, and will heat up rapidly while the engine is running. The sensor
   must reach operating temperature before the system will function in closed loop.


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