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.
4-40 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0203 - Cylinder 3 Injector Circuit/Open (Continued)
Edge 2.7L, Escape/Kuga 1.6L, Escape/Kuga 2.0L, Expedition, Explorer 2.3L, Explorer 3.5L GTDI, F-150 2.7L, F-150 3.5L GTDI, Fiesta 1.0L, Fiesta 1.6L GTDI, Flex 3.5L GTDI, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKS 3.5L, MKT 2.0L, MKT 3.5L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L, Navigator, Taurus 2.0L, Taurus 3.5L GTDI, Transit 3.5L, Transit Connect 1.6L
All others GO to Pinpoint Test KG.
P0204 - Cylinder 4 Injector Circuit/Open
Description: The comprehensive component monitor (CCM) monitors the operation of the fuel injector drivers in the PCM.
This DTC sets when the fuel injector circuitry is inoperative.
Possible Causes: • VPWR circuit open (if equipped)
• INJ4 circuit open
• INJ4 circuit short to ground (direct injection vehicles)
• INJ4 circuit short to voltage (direct injection vehicles)
• INJ4RTN circuit open (if equipped)
• INJ4RTN circuit short to ground (if equipped)
• INJ4RTN circuit short to voltage (if equipped)
• Damaged fuel injector 4
• Damaged PCM
Diagnostic Aids: For direct injection vehicles, the INJ4_F PID flags a concern. For all others, the INJ4_F PID flags equals YES.
Application Key On Engine Off Key On Engine Running Continuous Memory
Edge 2.0L, GO to Pinpoint Test DI. Edge 2.7L, Escape/Kuga 1.6L, Escape/Kuga 2.0L, Expedition, Explorer 2.3L, Explorer 3.5L GTDI, F-150 2.7L, F-150 3.5L GTDI, Fiesta 1.0L, Fiesta 1.6L GTDI, Flex 3.5L GTDI, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKS 3.5L, MKT 2.0L, MKT 3.5L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L,
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
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.