Vehicle: 2011 Ford F 150,
4WD, V6-3.5L Turbo, Automatic Transmission
Problem: The MIL was ON with DTCs set in ABS
module: C109E – Vacuum sensor circuit fault and B1596 – Service
Details: The following are tests recommended by
the Tech-Assist consultant and the test results reported by the
Check the brake booster vacuum level (BBVACLVL) PID in scan
tool data, which should match actual engine vacuum gauge
reading. No, vacuum readings did not match.
Check for 5 volts at brake booster sensor GY/YE wire. Yes, 5
volts reading was present.
Check for ground at brake booster sensor BK-GN wire. Yes,
ground was present.
Back-probe brake booster sensor voltage at connector Pin #1
and compare that reading with the “BBAVACLVL” sensor reading
on the scan tool – the readings should be equal. No, the
voltage readings were not equal.
Check GN/BN wire between brake booster sensor and ABS module
pin #10 for open/short circuit. Found an open circuit.
Confirmed Repair: The technician found the GN-BN
wire was broken about 12-18 inches from the brake booster sensor.
He repaired the wire and that fixed the problem.