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VATS Fuel Enable Signal to ECM

All information for 1990 Corvettes provided by BadjerJim on CorvetteForum

Replacing the ERPOM in the ECM

Things you will need:
  • 10mm nut driver or socket
  • Newly flashed ECM chip with VATS removed – can be purchased from pcmforless.com and also custom tailored to your liking with other performance enhancements at the same time.

Note: this procedure and related pics are for 1990-1993 Corvettes. Earlier models had the ECM stashed up under the passenger-side Breadbox. [See 1986 through 1989 procedures]. Later models, you need to ‘flash’ the ECM (or send it to pcmforless.com for an exchange programmed unit).

  • Pop the hood, and locate the ECM. You can’t miss it: the ECM is on the driver’s side, above the battery, as shown in the following pic:
Picture
ECM Located under the hood on the driver's side
  • Pry off the plastic cover that protects the wiring harness connectors. It kinda has a velcro-like stuff that sticks it to the top of the ECM. When removed, the ECM will look like this:
Picture
  • Remove the three nuts that secure the ECM. These are 10mm nuts. For the one near the cruise-control gadget (farthest toward the driver’s side of the car) you need a socket extension.
  • When the three nuts are removed, carefully turn the ECM upside-down. You do not have to unplug any of the wires on the ECM. This will reveal the cover plate on the ECM, as shown in the following pic:
Picture
  • Remove the four hex-head screws that secure the cover plate. These are small SAE-size screws (not metric). With the cover removed, you can access the stock programming chip. It’s right under the cover. My chip was blue plastic. Note that there are plastic retaining clips on each end of the chip, as shown in the following pic:
Picture
  • Fold down the plastic tabs that retain the stock chip. They fold down, out away from the ends of the chip. This will pry the chip up slightly so it’s easy to remove. Then, just pull the stock chip straight up and out of the ECM.
  • When dealing with any computer chips, static electricity is an issue. Before you continue, discharge any static electricity you may have on your hands (like… by pulling on a big wool coat). To do this, just pat the plenum on the top of the engine. Say something soothing to your car like: “Good girl… this will all be over in a minute…”
  • Connect one side of the old stock chip onto the connectors of the chip-adapter provided by pcmforless.com. Pay attention to the orientation of the stock chip, and where it plugs into the adapter. Complete instructions are provided by pcmforless.com when you buy the chip-upgrade.
  • Plug the new pcmforless.com upgrade adapter into the ECM. Push it straight down onto the connector. Fold the two plastic retaining clips back up over the ends of the adapter, so it looks like this:
Picture
  • Put the cover back on the ECM (4 screws). Flip the ECM over, and put it back into its bracket. Secure the 3 10mm nuts. Replace the plastic cover over the wiring harness.
Done.

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  • Home
  • Abandoned Travels
    • Abandonments >
      • 2014-2015 >
        • Mayo Urbex
        • Howey Mansion
        • Uncle James Farmhouse
        • Coffee Farmhouse 01
        • Barber Homestead
        • Fallout Shelter
      • 2013 >
        • CMX Construction
        • Orange House 01
        • Fertilizer Plant
        • Egg Plant
        • Box Plant
        • Ellaville Bridge Revisited
        • Gold Kist Farms Silos
        • Lafayette House 03
        • Columbia House 01
        • Columbia Barn 01
        • Cash's Towing
        • Coastal Revisited
        • Suwannee Shack
        • Hernando House 01
        • Lafayette House 02
        • Lafayette House 01 Revisited
        • Lafayette Chimney Revisited
        • Lafayette Quarry Revisited
        • Williston Urbex
        • Elljay Garage
      • 2012 >
        • Suwannee Barn 01
        • Coastal Service Center
        • Lafayette Quarry
        • Lafayette Chimney
        • Lafayette House 01
        • Lafayette Trailer 01
        • Ellaville
        • Gilcrest House 01
        • Georgia Quarry
        • Family Farmhouse
      • 2010-2011 >
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        • Citrus House 01
        • Georgia House 01
        • Bahia Honda
    • Travels >
      • Italia >
        • Venezia
        • Firenze
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        • Roma (Coming Eventually)
      • France >
        • Catedral de Notre Dame
      • Cuba
      • United States >
        • Key Largo
        • Smoky Mountains
        • Jasper
        • Shenandoah National Park
        • Colorado 01
        • Colorado 02
        • High Shoals Falls
    • Nature >
      • Super Wolf Blood Moon
    • Water >
      • Blue Heron Bridge 04
      • Blue Heron Bridge 03
      • Ginnie Springs 02
      • Ginnie Springs 01
      • Ginnie Springs 03
      • Blue Heron Bridge 02
      • Blue Heron Bridge 01
  • Games
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    • VATS Help >
      • 1984-1985
      • 1986-1989 >
        • Passkey Ignition Switch
        • Start Enable Relay
        • VATS Cranking Fuel Enable Signal
        • Schematics
      • 1990 >
        • Start Enable Relay
        • VATS Fuel Enable Signal to ECM
        • Schematics
      • 1991 >
        • Schematics
      • 1992 >
        • Info
        • Schematics
      • 1993 >
        • Info
        • Schematics
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