C1.5 and C2.2 Industrial Engines Caterpillar

• Electronic Control Module (ECM) on the engine

• Clean Emissions Module (CEM)

• Sensors

• Associated components

Components for the driven equipment should also be considered. When possible, remove the component that requires welding. When welding on an engine that is equipped with an ECM and removal of the component is not possible, the following procedure must be followed. This procedure minimizes the risk to the electronic components.

1. Stop the engine. Remove the electrical power from the ECM.

2. Ensure that the fuel supply to the engine is turned off.

3. Disconnect the negative battery cable from the battery. If a battery disconnect switch is installed, open the switch.

4. Disconnect all electronic components from the wiring harnesses. Include the following components:

   • Electronic components for the driven equipment

   • ECM

   • Sensors

   • Electronically controlled valves

   • Relays

   • Aftertreatment ID module
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   NOTICE
   Do not use electrical components (ECM or ECM sensors) or electronic component grounding points for grounding the welder.

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   Illustration 1	g01075639
   Use the example above. The current flow from the welder to the ground clamp of the welder will not damage any associated components. (1) Engine (2) Welding electrode (3) Keyswitch in the OFF position (4) Battery disconnect switch in the open position (5) Disconnected battery cables (6) Battery (7) Electrical/Electronic component (8) Minimum distance between the component that is being welded and any electrical/electronic component (9) The component that is being welded (10) Current path of the welder (11) Ground clamp for the welder

5. When possible, connect the ground clamp for the welding equipment directly to the engine component that will be welded. Place the clamp as close as possible to the weld. Close positioning reduces the risk of welding current damage to the engine bearings, to the electrical components, and to other components.

6. Protect the wiring harnesses from welding debris and/or from welding spatter.

7. Use standard welding procedures to weld the materials together.