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.
The ignition switch is spring loaded to automatically return to the RUN position after being placed in the START position. When the ignition switch is placed in START, fused ignition voltage is sent to:
- the control side of the run/start relay.
- the internal logic of the Smart Junction Box (SJB) for RUN circuit monitoring.
- the SJB and starter relay on diesel engines without One-Touch Integrated Start (OTIS)
- the PCM and OTIS diode on diesel engines with OTIS and on all gasoline engines.
- B2A20 Ignition Stuck in START - The SJB continuously monitors the ignition switch state, if the SJB detects voltage on circuit CDC35 (BU/WH) or CDC38 (WH/VT) for more than 30 seconds, DTC B2A20 will be set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Ignition switch
- SJB