LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1994 >> Cavalier Base, 2.2 4 >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Ignition System >> Programmable Read-Only Memory (Prom) >> Installation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Programmable Read-Only Memory (Prom): Installation

  1. Ensure new PROM has same service number as old one. Position PROM squarely over ECM/PCM PROM access hole. Press on outer edges of PROM until PROM is firmly seated in ECM/PCM.
    NOTE: Ensure reference notches in both ECM/PCM and PROM are properly aligned. If PROM is installed backwards, PROM will be destroyed when ignition is turned on.
  2. Install PROM access cover on ECM/PCM. Install ECM/PCM in vehicle. See ENGINE CTRL MODULE (ECM)/POWERTRAIN CTRL MODULE (PCM) . Start engine and enter diagnostics. See appropraite G - TEST W/ CODES article in this section below. Check for trouble codes. Also see appropriate G - TEST W/ CODES article in this section for code identification.
  3. If code(s) sets, PROM is either not fully seated in ECM/PCM or installed backwards, has bent pins or is defective. If bent pins crack when trying to straighten, replace PROM. If PROM is installed backwards or is defective, replace PROM.
scientia non olet · About LEMON Manuals