Ford F150 Pickup. Instruction - part 1558

Fig. 328: Identifying Cooling Fan Circuits (Ranger 2.3L) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

Fig. 329: Identifying Cooling Fan Circuits (Sable & Taurus) 
Courtesy of FORD MOTOR CO. 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

Fig. 330: Identifying Cooling Fan Circuits (Windstar) 
Courtesy of FORD MOTOR CO. 

COOLING FAN RELAY LOCATIONS 

Application & Relay

Location

Aviator

Auxiliary Junction Box

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

Testing 

1) For KOEO & KOER Only DTC P0480, P0481, P0482, P1474, P1477 & P1479: Check VPWR 
(Or IGN START/RUN On Escape) Voltage To Applicable Fan Control Relay 
DTC P0480 or P1474 is set when PCM grounds LFC circuit and PCM detects excessive current draw is 
detected on LFC circuit; or with LFC circuit not grounded by PCM and PCM does not detect voltage on 
LFC circuit. PCM expects to detect VPWR voltage coming through LFC relay (or CCRM) coil to LFC 
circuit. DTC P1477 is set when MFC output is commanded ON (grounded) and PCM detects excessive 
current draw on MFC circuit; or with MFC circuit commanded OFF, PCM does not detect voltage on 
MFC circuit. PCM expects to detect IGN START/RUN voltage coming through MFC relay coil to MFC 
circuit. DTC P0481 or P1479 is set when HFC output is commanded ON (grounded) and PCM detects 
excessive current draw on HFC circuit; or with HFC circuit commanded OFF, PCM does not detect 
voltage on HFC circuit. PCM expects to detect VPWR voltage coming through HFC relay (or CCRM) 
coil to HFC circuit. Possible causes are: 

Escape

2.0L

HFC, LFC, MFC

Battery Junction Box, In Engine Compartment

3.0L

HFC No. 1 (MAIN FAN) & No. 2 (ADD 
FAN 2) & LFC

Battery Junction Box, In Engine Compartment

MFC (ADD FAN 3)

Located On Driver's Side Of Fan Shroud

Focus

With A/C

HFC, LFC & MFC

Battery Junction Box, In Engine Compartment

Without A/C

 

Battery Junction Box, In Engine 

Compartment

Ranger 2.3L

 

Battery Junction Box, In Engine 

Compartment

Sable & Taurus

HFC No. 1 & No. 2

Battery Junction Box, In Engine Compartment

LFC (Fan Braking Relay) & MFC

Located In Relay Center Box No. 1 On Left Side Of 

Engine Compartment

Windstar

HFC & LFC

Battery Junction Box, In Engine Compartment

(1)

Equipped with one cooling fan relay.

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

NOTE:

High Speed Fan (HFC) relay No. 1 and 2 may also be referred to as EDF or 
HEDF relay respectively.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline