3512B Marine Auxiliary Engines Caterpillar

Removal Procedure

Note: If the ECM is being replaced, download the personality module before you remove the ECM. Refer to Troubleshooting, "Replacing the ECM with a New ECM".

1. Turn the keyswitch to the OFF position.
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   Illustration 1	g00599091

2. Use a 4 mm Allen wrench to disconnect 40-pin connectors (1).

3. Disconnect ground strap (2).

   Note: It is not necessary to perform Step 4 for the secondary ECM. The secondary ECM is not cooled by fuel.

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   Illustration 2	g00599093

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   NOTICE
   Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.

4. Disconnect fuel hose assemblies (3). Immediately place caps or plugs on the openings.

   Note: Rubber grommets behind the ECM are held in place by the mounting bolts. The grommets help to reduce vibration. The grommets may fall when the bolts and/or the ECM are removed. Be sure not to lose the rubber grommets.

5. Support ECM (5). Remove bolts (4).

6. Remove the ECM (5).

Installation Procedure

Note: Rubber grommets behind the ECM are held in place by the mounting bolts. The grommets help to reduce vibration. Be sure to use the rubber grommets when you install the ECM.

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Illustration 3	g00599093

1. Place the ECM (5) in the mounting position. Install bolts (4).

   Note: It is not necessary to perform Step 2 for the secondary ECM. The secondary ECM is not cooled by fuel.

2. Connect fuel hose assemblies (3).

   Note: You should be able to slightly move the ECM after the bolts and the fuel hose assemblies are installed. If the ECM cannot be moved slightly, check that the fuel hose assemblies are not pulling the ECM against one side of the grommets.

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   Illustration 4	g00599091

3. Connect ground strap (2).

4. Connect 40-pin connectors (1).