What fuse powers the engine cooling fan circuit?

A 60A fuse in position 5 of the Power Distribution Box (hot at all times), shown on page 13-2.

What module controls the cooling fan relays?

The Constant Control Relay Module (CCRM), which contains the EDF relay, HEDF relay, and a solid-state EDF relay control.

What wire colors and circuit numbers feed the cooling fan motor?

Circuit 228 DB (dark blue) and circuit 181 BR/O (brown/orange) run from the CCRM through connector C137 to the engine cooling fan motor; ground is circuit 57 BK to G101.

How does the PCM decide when to run the fan?

Per the diagram note, the PCM monitors engine coolant temperature and air conditioning status; when operation is required it signals the IRCM/CCRM to turn on the fan at the desired speed.

Which PCM pins are used in the cooling fan circuit?

PCM pins 45 and 46 (connector C280), connected via circuits 197 T/O and 639 LG/P; the PCM is shown on pages 23-7 and 24-7.

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1996 Ford/Mercury Cooling Fan Wiring Diagram - CCRM, EDF/HEDF Relays & PCM

Cooling fan wiring diagram with EDF and HEDF relays, fan motor, and PCM, color-coded circuits

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Wiring diagram for the engine cooling fan circuit showing EDF/HEDF relays, fan motor, constant control relay module, and PCM.

AI caption March 2009 · Photo 27 of 86

This document is page 33-1 of a factory-style wiring diagram covering the engine cooling fan circuit. Power comes from a 60-amp fuse (position 5) in the Power Distribution Box (referenced to page 13-2), which is hot at all times. Circuit 37 (Y) passes through connectors C122M/C122F, becoming circuit 38 (BK/O) through splice S123 into connector C138 at pins 3 and 4 of the Constant Control Relay Module (CCRM). Inside the CCRM are the EDF relay, HEDF relay, and a solid-state EDF relay control, with references to the PCM power relay (page 35-2) and pin 15 (page 33-2). Outputs on circuits 228 (DB) via splice S177 and 181 (BR/O) via splice S178 feed the engine cooling fan motor through connector C137; the motor has L, M, and H terminals and grounds through circuit 57 (BK) at G101. Circuits 197 (T/O) and 639 (LG/P) connect through C138/C280 to the Powertrain Control Module (pins 45 and 46, referenced to pages 23-7 and 24-7). Notes explain that the PCM monitors engine coolant temperature and A/C status to command fan speed.

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Frequently asked questions

What fuse powers the engine cooling fan circuit?: A 60A fuse in position 5 of the Power Distribution Box (hot at all times), shown on page 13-2.
What module controls the cooling fan relays?: The Constant Control Relay Module (CCRM), which contains the EDF relay, HEDF relay, and a solid-state EDF relay control.
What wire colors and circuit numbers feed the cooling fan motor?: Circuit 228 DB (dark blue) and circuit 181 BR/O (brown/orange) run from the CCRM through connector C137 to the engine cooling fan motor; ground is circuit 57 BK to G101.
How does the PCM decide when to run the fan?: Per the diagram note, the PCM monitors engine coolant temperature and air conditioning status; when operation is required it signals the IRCM/CCRM to turn on the fan at the desired speed.
Which PCM pins are used in the cooling fan circuit?: PCM pins 45 and 46 (connector C280), connected via circuits 197 T/O and 639 LG/P; the PCM is shown on pages 23-7 and 24-7.