Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
KC18 CHECK THE B+ CIRCUITS FOR AN OPEN
• Measure the voltage between:
( + ) Fuel Pump Control Module 2 Relay Connector, Harness Side | ( - ) |
|---|---|
B+ | Ground |
• For all others,
• Measure the voltage between:
( + ) Fuel Pump Control Module Relay Connector, Harness Side | ( - ) |
|---|---|
B+ | Ground |
Is the voltage greater than 10.5 V?
Yes | No |
|---|---|
For E-Series, Fiesta, and Motorhome / Stripped Chassis / Step Van, GO to KC19 . For Focus 2.3L, GO to KC20 . For all others, GO to KC21 . | 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. |
KC19 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 10.5 V?
Yes | No |
|---|---|
GO to KC20 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KC20 CHECK THE FUEL PUMP CONTROL MODULE RELAY GROUND CIRCUIT FOR AN OPEN
• Ignition OFF.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.