4AGE 20V Blacktop

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Diary of Swap
Cooling System


85/6 4AGE -> 4AGZE

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Air Intake Filter
Clutch Slave Cylinder
Clutch Master Cylinder
Coolant Flush
Distributor O-Rings
Exhaust Manifold
Fuel Filter
Fuel Pump Cut-off Switch
Ignition Timing
Oil Cooler Hoses
Oil Filter Adapter O-Rings
Oil Pan Gasket
Oxygen Sensor
Radiator Removal
Throttle Body Cleaning
TPS Adjustment
Water Pump


87+ Brake Upgrade
Caliper Rebuild-Front
Caliper Rebuild-Rear
Dust Shield Removal
Parking Brake Cable
SS Braided Brake Line


Ball Joint Replacement
Bushings Install - Front
Bushings Install - Rear
Steering Knuckle Removal
Struts/Springs - Front
Struts/Springs - Rear
Sway Bar End Links


87+ Antenna Replacement
Clear Turn Signals - Front
Clear Turn Signals - Rear
Door Hinges
Interior Door Triangles
Interior Headliner Painting
Interior Trim & Light Lens
Power Window Regulator
Rekeying Trunk Lock
Rust PM - Battery Bracket

Rust PM - Front Wheel Wells
Seats - MK3
Seats - Aftermarket
Shift Boot

SideMarker Mod

Sunroof Rattle
Wiper Switch


2006 Austin
2005 Austin
2005 Topeka NA2005
2004 Galveston
2004 Chattanooga SE2004
2003 Galveston
2002 Austin


Suspension Setup Pics
My MR2 Diary
Latest Pics of My MR2

20V 'Blacktop' Project - Day 18

I regretted tearing apart the interior of my MR2. But it just had to be done to figure out what wires I needed for the Blacktop ECU.

I had to tap into the radiator fan, blower, and defogger wires for the Electrical Load Signals on the ECU (ELS1, ELS2, ELS4). ELS3 for the taillights is already pulled back to the trunk on the MR2 harness. Fortunately, all 3 were available at the passenger side kick panel. Unfortunately, that's like a mile back to the ECU. Good thing I kept all the harnesses from the Trueno and was able to match up the colors pretty well.

To access the passenger kick panel, I had to remove 2 parts of the ventilation system. This gave me the opportunity to remove the evaporator from it's section, since I'm not going to be running AC. Here's pices of the evaporator:

When I opened the ventilation system, there was this orange insulation/sound deadening stuff on most of the flaps. This was virtually disentegrating, and getting all over the place. So I scraped and vacuumed as much of this up as possible. I also fixed a slight problem with the recirculate/fresh air flap. It used to make a loud thunk when moving to one position. A slight bend of the metal flap cured the problem.

Here's some pics of the blower and evap sections removed so that you can see the wiring looms.

Since there wasn't any way to tap into the connectors that come into the junction box, I found matching 4-pin male/female connectors. I spliced into the 3 appropriate wires, soldered the connections, taped them with fancy red tape, then re-wrapped the loom with standard black electrical tape. Here's the junction box & loom with the new connections, before and after taping.

The side that plugs into this (and runs to behind the driver's seat) is already built and is sitting on my garage floor ATM. Just need to clean it up, and retape the loom.

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Disclaimer: This web page in no way replaces the MR2 repair manual. Follow what it says before me. The purpose of this page is to give you a better pictorial description of what to do. I cannot be held responsible for any mishaps caused by this web page.