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Home >> GMC >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Remove/Install/Overhaul) >> Powertrain Control Module (Pcm) >> Programmable Read-Only Memory (Prom) >> Removal

Programmable Read-Only Memory (Prom): Removal

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove PCM from vehicle. See REMOVAL under CONTROL UNIT . Position PCM so bottom cover is facing upward. Remove slide-off PROM access cover by depressing locking tab.
  2. Using PROM removal tool, grasp PROM at narrow ends. Gently rock PROM from end to end while pulling up. If installing new PROM, remove old PROM from PROM carrier.
NOTE: Note reference notch locations in PROM, carrier and PCM for reassembly reference.
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