Some 2011 Ford Fiesta vehicles may exhibit a MIL on with DTC U029F set in the PCM and/or a no-crank condition with no communication with the PCM.
1. Disconnect the battery.
2. Inspect fuse F27 in the battery junction box (BJB) for a possible open condition. Replace the fuse as required.
3. Remove the rear set cushion.
4. Determine the vehicle build date. If the build date is on or before 3/29/2011, install the in-line fuse included with the Natural Vacuum Leak Detection (NVLD) service kit. Follow the instructions included with the kit. If the build date is after 3/29/2011, inspect the in-line NVLD fuse.
a. Fuse open: Replace 1A fuse and install a new NVLD service kit.
b. Fuse closed: Install the rear seat cushion, connect the battery and continue with normal diagnostics (refer to Powertrain Control/Emission Diagnosis manual, pinpoint test HZ.
AE8Z-9J279-L……..NVLD module and hose assembly: 4-door
AE8Z-9J279-M…….NVLD module and hose assembly: 5-door