Ignition Control Module

This procedure covers the removal and replacement of the ignition control module (ICM) on the 5.0L Coyote V8 engine, which controls spark timing and coil firing sequence.

Warnings

Tools required

Parts

• Ignition Control Module × 1 — Use OEM Motorcraft DY1305 or equivalent
• Thermal paste/heat sink compound × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect negative battery terminal and secure away from battery post
3. Wait minimum 10 minutes for electrical system to discharge
4. Remove engine cover by pulling upward on all four corners to release grommets
5. Take a photo of coil connector positions for reference during reassembly

Procedure

1. 1

   Access the ignition control module
   Locate the ICM on the passenger side valve cover near the firewall. It is a rectangular aluminum housing with multiple electrical connectors. You may need to move aside wiring harnesses or hoses for better access.
2. 2

   Disconnect ignition coil harness connectors
   Press the locking tabs on each of the 8 ignition coil electrical connectors and carefully disconnect them from the coils. These connectors feed through the ICM, so they must be disconnected before module removal. Move the harness aside to create working room.
3. 3

   Disconnect ICM main power connector
   Locate the main power connector on the ICM body. Press the locking tab and firmly pull the connector straight out. This is a multi-pin connector with a secondary locking mechanism—ensure both locks are released before pulling.
4. 4

   Remove ICM mounting bolts
   Remove the mounting bolts securing the ICM to the valve cover using a 10mm socket. There are typically 3-4 bolts depending on model year. Note the bolt locations and any ground straps attached under the bolt heads.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
5. 5

   Remove the ignition control module
   Carefully lift the ICM straight up from the valve cover. The module has thermal paste on the mounting surface to aid heat transfer. If the module resists removal, gently rock it side to side while pulling upward—do not pry against the valve cover.
6. 6

   Clean mounting surface
   Use a clean lint-free cloth to remove all old thermal paste from the valve cover mounting surface. The surface must be completely clean for proper heat transfer. Inspect for any debris or damage to the mounting area.
7. 7

   Prepare new ICM
   Apply a thin, even layer of thermal paste to the mounting surface of the new ignition control module. Use only a small amount—excess paste will be squeezed out and may contaminate connectors. Ensure electrical connectors on new module are clean and free of contamination.
8. 8

   Install new ICM
   Position the new ICM onto the valve cover, aligning the bolt holes and ensuring the thermal paste makes full contact. Verify that any ground straps are positioned under the appropriate bolt locations as noted during removal.
9. 9

   Install and torque mounting bolts
   Install the mounting bolts and tighten in a cross pattern to ensure even seating. Torque to specification using a calibrated torque wrench. Do not over-torque as this can damage the valve cover or ICM housing.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
10. 10

    Reconnect ICM main power connector
    Connect the main power connector to the ICM, ensuring it seats fully with an audible click. Verify the locking tab engages completely. Gently tug on the connector to confirm it is secure.
11. 11

    Reconnect ignition coil connectors
    Reconnect each of the 8 ignition coil electrical connectors in their original positions (refer to photo taken during disassembly). Ensure each connector clicks into place and the locking tabs engage. Route the harness to avoid contact with hot exhaust components.
12. 12

    Reinstall engine cover and reconnect battery
    Reinstall the engine cover by aligning the grommets with the mounting posts and pressing down firmly until seated. Reconnect the negative battery terminal and torque to manufacturer specification (not provided in database—hand tighten plus 1/8 turn).

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify wiring harness routing does not interfere with moving components or hot surfaces
3. Double-check that all mounting bolts are torqued to specification

Verification

• Turn ignition to ON position (do not start) and verify Check Engine Light performs normal self-test cycle without remaining illuminated
• Start engine and verify smooth idle with no misfires or rough running
• Use scan tool to verify no ignition system fault codes are present (P0351-P0358 are coil circuit codes)
• Test drive vehicle and confirm normal acceleration and no hesitation under load
• Verify no fuel smell or oil leaks around work area after engine reaches operating temperature

Related trouble codes on this vehicle

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