C6.6 Industrial Engine Electronic Control Module - Remove and Install - Electronic Control Module With Quick Coupler Connections Caterpillar

Removal Procedure

1. Turn the battery disconnect switch to the OFF position.

2. Turn the fuel supply to the OFF position.
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3. Cut all cable straps that attach the wiring harness assemblies to electronic control module (6).

   Note: Note position of cable straps that attach the wiring harness assemblies to the electronic control module.

4. Remove bolt (2). Loosen Allen head bolt (3) that secures engine wiring harness assembly (4) to electronic control module (6). Disconnect the engine wiring harness assembly from the electronic control module.

5. Remove bolt (7). Loosen Allen head bolt (5) that secures engine wiring harness assembly (9) to electronic control module (6). Disconnect the Original Equipment Manufactures (OEM) wiring harness assembly from the electronic control module.

6. Position harness assembly (9) and harness assembly (4) away from electronic control module (6).

7. Make temporary identification marks on fuel line (1) and fuel line (8) in order to show the correct position of the fuel lines.

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

9. Disconnect fuel line (1) and remove the fuel line from fuel line clips. Use Tooling (A) to plug fuel lines (1). Position the fuel line away from the electronic control module.

10. Use Tooling (A) to cap connection (10) on the electronic control module.

11. Remove fuel line (8) and drain the fuel from electronic control module (6). Use Tooling (A) to plug fuel lines (8).

12. Use Tooling (A) to cap connection (11) on the electronic control module.
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13. Loosen bolts (16) for electronic control module (6).

14. Remove bolts (16) and remove washers (14) and washer (15). Take care to prevent damage to ground connection (13).

    Note: Support the weight of the electronic control module as the remaining bolts are removed.

15. Remove bracket (12) and remove electronic control module (6) from mounting bracket for the electronic control module.

    Note: Note the orientation of the electronic control module.

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16. If necessary, follow Step 16.a through Step 16.c in order to disassemble electronic control module (6).

    1. Remove connection (10) and remove O-ring seal (20). Use Tooling (A) to cap connection (10) and plug electronic control module (6).

    2. Remove connection (11) and remove O-ring seal (21) (not shown). Use Tooling (A) to cap connection (11) and plug electronic control module (6).

    3. Remove isolation mounts (17), isolation mounts (18), and limit sleeves (19) from electronic control module (6).

Installation Procedure

1. If a replacement electronic control module is installed, the module must be programmed with the correct information. Refer to Troubleshooting , "Replacing the ECM" and refer to Troubleshooting , "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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3. If necessary, follow Step 3.a through Step 3.e in order to assemble electronic control module (6).

   1. Remove the cap from connection (10). Install a new O-ring seal (20) to the connection.

   2. Remove the cap from connection (11). Install a new O-ring seal (21) (not shown) to the connection.

   3. Remove the plugs from electronic control module (6).

   4. Install connection (10) and connection (11) to electronic control module (6). Tighten the connections to a torque of 18 N·m (159 lb in).

   5. Install isolation mounts (17), isolation mounts (18), and limit sleeves (19) to electronic control module (6).
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4. Install washers (14) and washers (15) to bolts (16).

   Note: Ensure that ground strap (13) for the electronic control module is clamped between washer (15) and washer (14).

5. Position electronic control module (6) on mounting bracket (19) for the electronic control module. Loosely install bolts (16) to the lower isolator mounts.

   Note: Ensure that the electronic control module is correctly oriented.

6. Position bracket (12) onto electronic control module (6). Install remaining bolts (16) to bracket (12).

7. Tighten bolts (16) to a torque of 22 N·m (195 lb in).

   Note: Ensure that the ground strap is not strained as the bolt is tightened.

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8. Remove the plugs from fuel line (1) and fuel line (8).

9. Remove caps from connection on electronic control module (6) for fuel line (1) and fuel line (8).

10. Connect fuel line (1) and fuel line (6) to electronic control module (6).

11. Install fuel line (1) to fuel line clips.

12. Connect engine wiring harness assembly (4) to electronic control module (6). Tighten Allen head bolt (3) to a torque of 6 N·m (53 lb in).

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

13. Install bolt (2) and tighten the bolt to a torque of 6.5 N·m (58 lb in).

14. Connect OEM wiring harness assembly (9) to electronic control module (6). Tighten Allen head bolt (5) to a torque of 6 N·m (53 lb in).

15. Install bolt (7) and tighten the bolt to a torque of 6.5 N·m (58 lb in).

16. Install new cable straps to the wiring harness assemblies.

    Note: Ensure that the cable straps meet the OEM specifications.

17. Turn the fuel supply to the ON position.

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

19. Remove the air from the fuel system. Refer to Operation and Maintenance Manual, "Fuel System - Prime" for the correct procedure.