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.
KC27 ISOLATE THE OPEN IN THE VPWR FUEL CIRCUIT
• IFS Switch connector disconnected.
• Measure the resistance between:
( + ) Fuel Pump Control Module Relay Connector, Harness Side | ( - ) IFS Switch Connector, Harness Side |
|---|---|
VPWR Fuel | VPWR Fuel - A - Pin 2 |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
GO to KC28 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
KC28 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 - Pin 1 | VPWR Fuel |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
INSTALL a new IFS switch. REFER to the Workshop Manual Section 310-01, Fuel Tank And Lines. Clear the PCM DTCs. REPEAT the self-test. | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
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 Workshop Manual Section 501-20B, Supplemental Restraint System. Clear the PCM DTCs. REPEAT the self-test. | GO to KC30 . |
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.