C6.6 Engines for Caterpillar Built Machines Electronic Control Module - Remove and Install Caterpillar

Removal Procedure

Ensure that all adjustments and repairs that are carried out to the fuel system are performed by authorized personnel that have the correct training.

Before begining ANY work on the fuel system, refer to Operation and Maintenance Manual, "General Hazard Information and High Pressure Fuel Lines" for safety information.

Refer to System Operation, Testing and Adjusting, "Cleanliness of Fuel System Components" for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.

1. Turn the fuel supply to the OFF position.

2. Turn the battery disconnect switch to the OFF position.
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   Illustration 1	g01341877
   Typical example

3. Cut cable tie (3). Unscrew the fastener (6) that secures the OEM harness (2) to the electronic control module (5). Disconnect the OEM harness from the electronic control module.

4. Cut the cable straps (1), (9) and (10). Unscrew the fastener (8) that secures engine harness (7) to electronic control module (5). Disconnect the engine harness from the electronic control module.

5. Make temporary identification marks on plastic tube assemblies (4) and (11) in order to show the correct position of the tube assemblies.

6. Place a suitable container below the electronic control module (5) in order to catch any fuel that might be spilled.

7. Disconnect plastic tube assemblies (4) and (11). Plug the plastic tube assemblies with new plugs. Drain the fuel from electronic control module (5). Cap the connectors in the electronic control module with new caps.
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   Illustration 2	g01341878
   Typical example

8. Loosen bolts (19) and remove the assembly of the electronic control module. Note the orientation of the electronic control module.

9. Remove bolts (19) and remove washers (18) from electronic control module (5). Note the position of the ground strap for the electronic control module.

10. If necessary, follow Steps 10.a through 10.d in order to disassemble the electronic control module.

    1. Remove isolation mounts (20) and spacers (21).

    2. Remove connectors (13). Remove the O-ring seals (12) from the connectors.

    3. Remove torx screw (15) and remove bracket (14) for the engine wiring harness. Note the orientation of the bracket.

    4. Remove bolt (17) and remove bracket (16) from the engine wiring harness. Note the orientation of the bracket.

Installation Procedure

1. If a replacement electronic control module is installed, the module must be programmed with the correct information. Refer to Troubleshooting Guide, "Replacing the ECM" and refer to Troubleshooting Guide, "Flash Programming" for the correct procedure.

2. Ensure that the electronic control module is clean and free from damage. If necessary, replace the electronic control module.
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   Illustration 3	g01341878
   Typical example

3. If necessary, follow Steps 3.a through 3.d in order to assemble the electronic control module.

   1. Install new O-ring seals (12) to connectors (13). Install two connectors (13) to the electronic control module. Tighten the connectors to a torque of 18.5 N·m (13.6 lb ft).

   2. Position bracket (14) on the electronic control module. Ensure that the bracket is correctly oriented. Install torx screw (15). Tighten the torx screw to a torque of 20 N·m (14 lb ft).

   3. Position bracket (16) on electronic control module (5). Ensure that the bracket is correctly oriented. Install bolt (17). Tighten the bolt to a torque of 20 N·m (14 lb ft).

   4. Install isolation mounts (20) and spacers (21) to the electronic control module.

4. Install washers (18) and bolts (19) to electronic control module (5).

   Note: Ensure that the ground strap for the electronic control module is clamped between the washer and the appropriate bolt.

5. Install the assembly of the electronic control module to the mounting bracket. Tighten bolts (19) to a torque of 22 N·m (16 lb ft).

   Note: Ensure that the electronic control module is correctly oriented. Ensure that the ground strap is not strained as the bolt is tightened.

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   Illustration 4	g01341877
   Typical example

6. Remove the plugs from plastic tube assemblies (4) and (11). If necessary, remove the caps from the connectors in the electronic control module. Connect plastic tube assemblies (4) and (11).

7. Connect engine wiring harness (7) to electronic control module (5). Tighten the fastener (8) to a torque of 5 N·m (3 lb ft).

   Note: Care must be taken in order to avoid damage to the connector pins during installation of the harness.

8. Position the assembly of the engine wiring harness onto brackets (14) and (16). Use new cable straps (1), (9) and (10) in order to secure the harness assembly to the brackets.

9. Connect OEM wiring harness (2) to electronic control module (5). Tighten fastener (6) to a torque of 5 N·m (3 lb ft).

   Note: Care must be taken in order to avoid damage to the connector pins during installation of the harness.

10. Use a new cable strap (3) in order to secure the harness assembly.

11. Turn the fuel supply to the ON position.

12. Turn the battery disconnect switch to the ON position.

13. Remove the air from the fuel system. Refer to Operation and Maintenance Manual, "Fuel System - Prime".