P0288

P0288 sets when the cyl 10 injector circuit reads low, indicating short to ground or internally shorted solenoid, and only applies to V10 engines. Cheapest first: swap injector 10 with another cylinder; PFI windings should ohm 11 to 17, with shorted coils reading 4 to 9 ohms. With the connector disconnected and key on, the driver-side pin should be open to ground; continuity to chassis ground indicates harness short. Pulse width at warm idle on the Ford 6.8L Triton runs 3 to 4 ms; on the BMW S85 V10 it runs 2 to 3 ms. Caveat: the Ford 6.8L V10 cylinder 10 is at the very back of the driver side and harness service requires upper intake removal on most years; do not pull injector connectors with the harness cold-soaked in subfreezing temps, because the connector locking tabs become brittle and snap off, converting a $0 inspection into a $90 pigtail repair.

Vehicle-specific patterns: 1999 to 2010 Ford 6.8L V10 Triton has the same rear-bank harness chafe pattern as P0285/P0286 and also suffers from corrosion at the connector where coolant has weeped from the back of the head; 2006 to 2010 BMW S85 M5/M6 has weak driver-side bank current monitoring; 2003 to 2010 Dodge Viper 8.3L V10 has cracked injector connectors. Estimated repair: $55 to $920.