Vehicle: 2010 Ford F-150, 4WD, V8-5.4L, flex fuel, automatic transmission/transaxle
Mileage: 136,009
Problem: The vehicle was towed in because although the engine would crank, it would not start. After sitting for a few minutes, the engine would start and run fine for a while then shut off and would not restart.
Case details: The technician connected a scan tool and pulled diagnostic trouble code (DTC) P0690 - Electronic control module (ECM) / powertrain control module (PCM) power relay sense circuit high.
Note: DTC P0690 sets when the voltage to the ignition switch position run (ISP-R) and the fuel injector power monitor (INJPWR) voltage readings do not correspond for a calibrated amount of time. The ISP-R is fed by fuse no. 53 (5 Amp). The voltage for INJPWRM is provided by the fuel pump relay from fuse no. 27 (20 Amp). Both fuses are in the battery junction box (BJB).
The technician checked technical service bulletins (TSBs) for this truck in ALLDATA and found one that mentioned that a problem with fuse no. 27 could cause a crank, no start and stalling problem. The problem is fixed by installing a special updated fuse holder (TSB: 15-0137, dated 09-02-15).
The technician followed the diagnostic directions in the TSB and found the fuse contacts for fuse no. 27 were burned on one side, leaving only 10.5 volts to power up the fuel injectors and fuel pump.
Confirmed Repair: The technician installed the new fuse holder (part no. EL3Z-14293-A). After that, the engine started every time and did not stall on a lengthy test drive.
Reprinted with permission from ALLDATA
