Pinpoint Test P : C101A:15, C101A:16, C101A:29
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
- P1 CHECK FOR OTHER ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, carry out the ABS module self-test.
Are any brake pedal position or pressure sensor Diagnostic Trouble Codes (DTCs) present in the ABS module?
Yes DIAGNOSE all ABS module brake pedal position or pressure sensor Diagnostic Trouble Codes (DTCs) before diagnosing DTC C101A:15, C101A:16 or C101A:29. No GO to P2 - P2 VERIFY ALL WIRING CONNECTIONS
- Ignition OFF.
- Disconnect ABS module C135 .
- Disconnect brake booster vacuum sensor C149 .
- Disconnect all in-line electrical connectors between the ABS module and the brake booster vacuum sensor.
- Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
- Inspect both connectors for any pushed-out pins. Refer to Connector Repair Procedures for schematic and connector information.
- Using a suitable mating terminal, check each female terminal for deformed or enlarged contacts by comparing the mating terminal's fit between each of the following pins:
Are both connectors free of corrosion, pushed-out pins and deformed or enlarged contacts?
Yes GO to P3 No REPAIR the affected terminal. Refer to Connector Repair Procedures for schematic and connector information. - P3 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)
- Connect ABS module C135 . Make sure it seats and latches correctly.
- Connect brake booster vacuum sensor C149 . Make sure it seats and latches correctly.
- Connect all in-line electrical connectors between the ABS module and the brake booster vacuum sensor. Make sure they seat and latch correctly.
- Ignition ON.
- Using a diagnostic scan tool, clear the ABS module Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Start the engine and allow it to run for at least 1 minute to build up vacuum in the brake booster.
- Fully and firmly, press and release the brake pedal 3 times.
- Using a diagnostic scan tool, carry out the ABS module self-test.
Is DTC C101A:15, C101A:16, or C101A:29 present?
Yes GO to P4 No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. - P4 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect ABS module C135 .
- Disconnect brake booster vacuum sensor C149 .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C135-5 Ground C135-10 Ground C135-37 Ground
Is any voltage present?
Yes REPAIR the circuit. No GO to P5 - P5 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C135-5 Ground C135-10 Ground C135-37 Ground
Are the resistances greater than 10, 000 ohms?
Yes GO to P6 No REPAIR the circuit. - P6 CHECK THE VACUUM SENSOR WIRING FOR AN OPEN
- Measure:
Positive Lead Measurement / Action Negative Lead C135-5 C149-3 C135-10 C149-2 C135-37 C149-1
Are the resistances less than 3 ohms?
Yes GO to P7 No REPAIR the circuit. - Measure:
- P7 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TOGETHER
Are the resistances greater than 10, 000 ohms?
Yes INSTALL a new brake booster vacuum sensor. No REPAIR the circuit.