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 BJB (battery junction box) for a possible open condition. Replace the fuse if necessary.
3. Remove the rear seat cushion.
4. Determine the vehicle build date. If the build date is on or before 3/29/2011, install the in-line fuse that’s included with the Natural Vacuum Leak Detection (NVLD) service kit. If this build date does not apply, inspect the existing in-line NVLD fuse. If the fuse is open, replace the 1A fuse and install the new NVLD service kit. If the fuse is closed, install the rear seat cushion, connect the battery and refer to the powertrain control/emission diagnosis manual, pinpoint test HZ for normal diagnostics.
P/N..................................PART
AE8Z-9J279L................ NVLD module and hose assembly, 4-door
AE8Z-9J279-M.............. NVLD module and hose assembly, 5-door
9L3Z-14526-BA............. BJB fuse
BE8Z-14526-AA............ 1A fuse
