Vehicle: 2011 Ford F 150, 4WD, V6-3.5L Turbo, Automatic Transmission
Mileage: 188,993
Problem: The MIL was ON with DTCs set in ABS module: C109E – Vacuum sensor circuit fault and B1596 – Service continuous codes.
Details: The following are tests recommended by the Tech-Assist consultant and the test results reported by the technician:
-
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.
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
Not an ALLDATA customer? For access to this valuable experience-based repair data and reliable OEM information, start a free trial today.
If you would like to read more articles like this one please subscribe to ALLDATA News.