Test Procedure

KC1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are DTCs P025A, P025B, P025C, P025D, P027A, P027B, P0627, P2632, U0109, U016C, U210B, or U0210C present?

Yes	No
For continuous memory DTCs P025A, P025B, P025C, P025D, P027A, P027B, P0627, P2632, U0109, U016C, U210B or U210C, GO to KC2. For KOEO and KOER DTCs P025A, P025B, P025C, P025D, P027A or P027B, GO to KC3. For KOEO and KOER DTCs P0627 or P2632, GO to KC8. For KOEO and KOER DTCs U0109 or U016C, GO to KC14. For KOEO and KOER DTCs U210B or U210C, GO to KC29.	For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

KC2 CONTINUOUS MEMORY DTCS P025A, P025B, P025C, P025D, P027A, P027B, P0627, P2632, U0109, U016C, U210B AND U210C: CHECK FOR KEY ON, ENGINE OFF (KOEO) DTCS

Ignition ON, engine OFF.
Clear the PCM DTCs.
Carry out the PCM self-test.

Are DTCs P025A, P025B, P025C, P025D, P027A, P027B, P0627, P2632, U0109, U016C, U210B or U210C present?

Yes	No
For DTCs P025A, P025B, P025C, P025D, P027A or P027B, GO to KC3. For DTCs P0627 or P2632, GO to KC8. For DTCs U0109 or U016C, GO to KC14. For DTCs U210B or U210C, GO to KC30.	Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .

KC3 DTC P025A, P025B, P025C, P025D, P027A, P027B: CHECK THE FPC CIRCUIT FOR AN OPEN

NOTE: The Mustang 5.4L is equipped with two fuel pump control modules. Diagnose the fuel pump control module related to the current DTC.

Ignition OFF.
Disconnect the fuel pump control module related to the current DTC.
PCM connector disconnected.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) PCM Connector, Harness Side
FPC	FPC

Is the resistance less than 5 ohms?

Yes	No
GO to KC4.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC4 CHECK THE FPC CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
FPC	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KC5.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

KC5 CHECK THE FPC CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
FPC	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to KC6.

KC6 CHECK THE FPC CIRCUIT FOR CORRECT RESPONSE

Ignition OFF.
Connect the fuel pump control module related to the current DTC.
For Mustang 5.4L,
Disconnect the fuel pump control module not related to the current DTC.
Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM Connector, Harness Side	(-)
FPC	Ground

Is the voltage greater than 10 V?

Yes	No
For DTCs P025B or P027B, GO to KC7. For all others, GO to KC35.	INSTALL a new suspect Fuel Pump Control Module. REFER to the appropriate Fuel Charging and Controls article. Clear the PCM DTCs. REPEAT the self-test.

KC7 CHECK THE HARNESS FOR ROUTING, ALTERATIONS, INCORRECT SHIELDING, OR ELECTRICAL INTERFERENCE FROM OTHER SYSTEMS

Ignition OFF.
Check the harness for the following:
- damaged insulation
- corrosion
- correct routing

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to KC35.

KC8 DTCS P0627 OR P2632: CHECK THE SUSPECT FPPWR, SUSPECT FPRTN AND INTERNAL FUEL PUMP CIRCUIT RESISTANCE

NOTE: The Mustang 5.4L is equipped with two fuel pump control modules. Diagnose the fuel pump control module related to the current DTC.

Ignition OFF.
Disconnect the fuel pump control module related to the current DTC.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) Fuel Pump Control Module Connector, Harness Side
Suspect FPPWR	Suspect FPRTN

Is the resistance less than 10 ohms?

Yes	No
GO to KC11.	GO to KC9.

KC9 CHECK THE SUSPECT FPPWR AND SUSPECT FPRTN CIRCUITS FOR AN OPEN

Disconnect the FP related to the current DTC.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) FP Connector, Harness Side
Suspect FPPWR	Suspect FPPWR
Suspect FPRTN	Suspect FPRTN

Are the resistances less than 5 ohms?

Yes	No
GO to KC10.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC10 CHECK THE SUSPECT FP FOR AN OPEN

Measure the resistance between:

(+) FP Connector, Component Side	(-) FP Connector, Component Side
Suspect FPPWR	Suspect FPRTN

Is the resistance less than 10 ohms?

Yes	No
GO to KC11.	INSTALL a new FP. REFER to the appropriate Fuel Tank and Lines article. Clear the PCM DTCs. REPEAT the self-test.

KC11 CHECK THE SUSPECT FPPWR CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
Suspect FPPWR	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KC12.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

KC12 CHECK THE SUSPECT FPPWR AND SUSPECT FPRTN CIRCUITS FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
Suspect FPPWR	Ground
Suspect FPRTN	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to KC13.

KC13 CHECK THE SUSPECT FUEL PUMP CONTROL MODULE FOR CORRECT OPERATION

Ignition OFF.
Connect the fuel pump control module related to the current DTC.
Ignition ON, engine OFF.

Measure the voltage between:

(+) FP Connector, Harness Side	(-) FP Connector, Harness Side
Suspect FPPWR	Suspect FPRTN

Access the PCM and control the FP (MODE) PID.
Command the FP PID ON.

Is the voltage greater than 10 V with the PID commanded ON?

Yes	No
INSTALL a new FP. REFER to the appropriate Fuel Tank and Lines article.	INSTALL a new suspect Fuel Pump Control Module. REFER to the appropriate Fuel Charging and Controls article.
Clear the PCM DTCs. REPEAT the self-test.	Clear the PCM DTCs. REPEAT the self-test.

KC14 DTCS U0109 OR U016C: CHECK THE VOLTAGE AND GROUND CIRCUITS TO THE SUSPECT FUEL PUMP CONTROL MODULE

NOTE: The Mustang 5.4L is equipped with two fuel pump control modules. Diagnose the fuel pump control module related to the current DTC.

NOTE: Verify the IFS switch is set (button pressed) (if equipped).

Ignition OFF.
Disconnect the fuel pump control module related to the current DTC.
Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) Fuel Pump Control Module Connector, Harness Side
VPWR Fuel	GND

Is the voltage greater than 10 V?

Yes	No
GO to KC25.	GO to KC15.

KC15 CHECK THE VOLTAGE TO SUSPECT FUEL PUMP CONTROL MODULE

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
VPWR Fuel	Ground

Is the voltage greater than 10 V?

Yes	No
GO to KC16.	For Focus, GO to KC17. For all others, GO to KC18.

KC16 CHECK THE GND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
GND	Ground

Is the resistance less than 5 ohms?

Yes	No
Unable to duplicate or identify the concern at this time.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC17 CHECK THE VPWR CIRCUIT FOR AN OPEN

BCM-E connector disconnected.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) BCM-E Connector, Harness Side
VPWR Fuel	VPWR - Pin E9

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new BCM. REFER to the appropriate Multifunction Electronic Modules article. Clear the PCM DTCs. REPEAT the self-test.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC18 CHECK THE FUEL PUMP CONTROL MODULE RELAY FOR CORRECT OPERATION

Ignition OFF.
Fuel Pump Control Module Relay connector disconnected.
Carry out the fuel pump control module relay component test. Refer to the appropriate ELECTRONIC CONTROLS - COMPONENT TESTING article .

Is a concern present?

Yes	No
INSTALL a new Fuel Pump Control Module relay. Clear the PCM DTCs. REPEAT the self-test.	GO to KC19.

KC19 CHECK THE B+ CIRCUIT FOR AN OPEN

Measure the voltage between:

(+) Fuel Pump Control Module Relay Connector, Harness Side	(-)
B+	Ground

Is the voltage greater than 10 V?

Yes	No
GO to KC20.	A B+ circuit concern is present. CHECK the condition of the related fuse/fuse links. If OK, REPAIR the open circuit. If the fuse/fuse link is damaged, CHECK the circuit for a short to ground before installing a new fuse/fuse link.

KC20 CHECK THE VPWR VOLTAGE TO THE FUEL PUMP CONTROL MODULE RELAY

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Relay Connector, Harness Side	(-)
VPWR	Ground

Is the voltage greater than 10 V?

Yes	No
GO to KC21.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC21 CHECK THE FUEL PUMP CONTROL MODULE RELAY GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure the resistance between:

(+) Fuel Pump Control Module Relay Connector, Harness Side	(-)
GND	Ground

Is the resistance less than 5 ohms?

Yes	No
GO to KC22.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC22 CHECK THE VPWR FUEL CIRCUIT FOR AN OPEN

Measure the resistance between:

(+) Fuel Pump Control Module Relay Connector, Harness Side	(-) Fuel Pump Control Module Connector, Harness Side
VPWR Fuel	VPWR Fuel

Is the resistance less than 5 ohms?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	For Escape, Expedition, and Navigator, GO to KC23. For all others, REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC23 ISOLATE THE OPEN IN THE VPWR FUEL CIRCUIT

Measure the resistance between:

(+) Fuel Pump Control Module Relay Connector, Harness Side	(-) IFS Switch Connector, Harness Side
VPWR Fuel	VPWR Fuel - A

Is the resistance less than 5 ohms?

Yes	No
GO to KC24.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC24 CHECK THE VPWR FUEL CIRCUIT FOR AN OPEN BETWEEN THE IFS SWITCH AND FUEL PUMP CONTROL MODULE

Measure the resistance between:

(+) IFS Switch Connector, Harness Side	(-) Fuel Pump Control Module Connector, Harness Side
VPWR Fuel - B	VPWR Fuel

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new IFS switch. REFER to the appropriate Fuel Tank and Lines article. Clear the PCM DTCs. REPEAT the self-test.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC25 CHECK THE SUSPECT FPM CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) PCM Connector, Harness Side
Suspect FPM	Suspect FPM

Is the resistance less than 5 ohms?

Yes	No
GO to KC26.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC26 CHECK THE SUSPECT FPM CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
Suspect FPM	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KC27.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

KC27 CHECK THE SUSPECT FPM CIRCUIT FOR VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
Suspect FPM	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to KC28.

KC28 CHECK THE SUSPECT FPM CIRCUIT FOR CORRECT RESPONSE

Ignition OFF.
PCM connector connected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
Suspect FPM	Ground

Is the voltage greater than 10 V?

Yes	No
INSTALL a new suspect Fuel Pump Control Module. REFER to the appropriate Fuel Charging and Controls article. Clear the PCM DTCs. REPEAT the self-test.	GO to KC35.

KC29 CHECK FOR RESTRAINTS CONTROL MODULE (RCM) DTCS

Carry out the RCM self-test.

Are any RCM DTCs present?

Yes	No
DIAGNOSE the supplemental restraint system concern. REFER to the appropriate Supplemental Restraint System article. Clear the PCM DTCs. REPEAT the self-test.	GO to KC30.

KC30 DTCS U210B OR U210C: INSPECT THE HARNESS BETWEEN THE FUEL PUMP CONTROL MODULE AND RESTRAINTS CONTROL MODULE (RCM)

NOTE: The Mustang 5.4L is equipped with two fuel pump control modules. Diagnose the fuel pump control module related to the current DTC.

Ignition OFF.
Check the harness for the following:
- damage
- corrosion
- correct routing

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to KC31.

KC31 CHECK THE ENS CIRCUIT FOR AN OPEN

NOTE: Refer to the warnings in appropriate Supplemental Restraint System article.

Disconnect the fuel pump control module related to the current DTC.
Depower the supplemental restraint system (SRS). Refer to the appropriate Supplemental Restraint System article for the Supplemental Restraint System (SRS) Depowering and Repowering procedure.
RCM connector disconnected.
Connect the battery ground cable.

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-) RCM Connector, Harness Side
ENS	ENS - Pin 19

Is the resistance less than 5 ohms?

Yes	No
GO to KC32.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KC32 CHECK THE ENS CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
ENS	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KC33.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

KC33 CHECK THE ENS CIRCUIT FOR VOLTAGE

Disconnect the fuel pump control module not related to the current DTC.
Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pump Control Module Connector, Harness Side	(-)
ENS	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to KC34.

KC34 CHECK THE ENS CIRCUIT FOR CORRECT RESPONSE

Ignition OFF.
Connect the fuel pump control module related to the current DTC.
Ignition ON, engine OFF.

Measure the voltage between:

(+) RCM Connector, Harness Side	(-)
ENS - Pin 19	Ground

Is the voltage greater than 10 V?

Yes	No
INSTALL a new RCM. REFER to the appropriate Supplemental Restraint System article.	INSTALL a new suspect Fuel Pump Control Module. REFER to the appropriate Fuel Charging and Controls article.
Clear the PCM DTCs. REPEAT the self-test.	Clear the PCM DTCs. REPEAT the self-test.

KC35 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.