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HOMESERVICE MANUALSGMC1993JIMMY BASE, 2D UTILITY, 4.3 Z, RWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEREMOVE, OVERHAUL & INSTALLENGINE CONTROLS - REMOVE/INSTALL/OVERHAULELECTRONIC CONTROL MODULE (ECM)CALPACREMOVAL & INSTALLATION
1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, Standard

Removal & Installation

1993 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, StandardSECTION Removal & Installation

Some ECM's use a CALPAC as well as a PROM. See Fig 1. The CALPAC must also be removed from old ECM and installed in new one. Removal and replacement procedures for CALPAC are same as for PROM. See PROGRAMMABLE READ-ONLY MEMORY (PROM). If units are installed improperly, grounding diagnostic test lead will set Code 52.

Fig 1: Locating PROM & CALPAC On ECM
G90G15723Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.