Question about 1996 Jeep Grand Cherokee
It is possible that the three slot box is compatible. Check on your ECM for a label. Use the numbers on that label to find the correct match. You can try a used parts store or wrecking yard, as well as the internet. You may have to remove the PROM from your old ECM and place it in the new ECM. Be very careful as the PROM is sensitive to static electricity. Let me know if you have any other questions.
Posted on Aug 18, 2008
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When the term Electronic Control Module (ECM) is used in this guide it will refer to the engine control computer regardless that it may be a Vehicle Control Module (VCM), Powertrain Control Module (PCM) or Engine Control Module (ECM).
The Electronic Control Module (ECM) is required to maintain the exhaust emissions at acceptable levels. The module is a small, solid state computer which receives signals from many sources and sensors; it uses these data to make judgments about operating conditions and then control output signals to the fuel and emission systems to match the current requirements.
Engines coupled to electronically controlled transmissions employ a Powertrain Control Module (PCM) or Vehicle Control Module (VCM) to oversee both engine and transmission operation. The integrated functions of engine and transmission control allow accurate gear selection and improved fuel economy.
In the event of an ECM failure, the system will default to a pre-programmed set of values. These are compromise values which allow the engine to operate, although at a reduced efficiency. This is variously known as the default, limp-in or back-up mode. Driveability is almost always affected when the ECM enters this mode.
Fig. Fig. 2: ECM mounting scheme-1996 models
The ECM is located in the passenger side footwell in the kick panel up to 1996. In 1996, the ECM is located in the engine compartment next to the battery.
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