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Home >> Jeep >> 1981 >> CJ7 Base, 2.5L Eng VIN B, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Controlled Catalytic Converter (C-4) System >> Component Replacement >> Programmable Read Only Memory (Prom) >> Removal
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Programmable Read Only Memory (Prom): Removal

  1. Remove ECM from vehicle. Remove access cover screw and cover from ECM. PROM "chip" removal and insertion tool will be included with replacement unit. Remove tool from replacement kit.
  2. Starting at opposite end from reference mark ("U2" stamped in ECM next to PROM and rectangular impression and paint stripe on PROM unit), gently work tang of removal tool beneath PROM unit with slight side to side rocking motion. DO NOT attempt to lift out PROM at this time. Remove extraction tool.
  3. At reference end, push tang of tool beneath unit (above mating socket), making sure tang is completely under unit. Grasp PROM unit with thumb and forefinger and pull straight up and out.
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