Normal Operation
WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
When placed in ACC, RUN or START, the ignition switch sends voltage out to the Smart Junction Box (SJB). Microprocessors in the SJB continuously monitors the ignition switch state.
- B2844 Ignition Fault - If the SJB receives an invalid ignition state (such as detecting voltage on the START circuit when the switch is in the RUN position) during normal operation, DTC B2844 will be set.
- U2472 Unexpected Ignition State - If during the SJB self test, the ignition is not in the RUN position or the RUN position cannot be detected, DTC U2472 will be set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- SJB