PINPOINT TEST G: DTCs C116A, C1440

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

G1 INSPECT THE STOPLAMP SWITCH AND VERIFY INSTALLATION
- Inspect the stoplamp switch for obvious signs of damage.
- Remove and install the stoplamp switch. Refer to Stoplamp Switch Removal and Installation in EXTERIOR LIGHTING .
- Press the brake pedal and verify the stoplamps operate correctly.
Do the stoplamps operate correctly and is the switch free from any damage?
- Yes : GO to G2 .
- No : If the stoplamp switch is damaged, INSTALL a new stoplamp switch. REFER to Stoplamp Switch Removal and Installation in EXTERIOR LIGHTING .
  DIAGNOSE the stoplamps. REFER to Stoplamp Switch Diagnosis and Testing in EXTERIOR LIGHTING .
G2 MONITOR THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Data Logger - ABS Module.
- Press and release the brake pedal while monitoring the BOO_ABS PID.
Does the PID display ON with the brake pedal applied and OFF with the brake pedal released?
- Yes : GO to G4.
- No : GO to G3 .
G3 MONITOR THE PCM BRAKE ON/OFF (BOO1) PID
- Enter the following diagnostic mode on the scan tool: Data Logger - PCM.
- Press and release the brake pedal while monitoring the BOO1 PID.
Does the PID display ON with the brake pedal applied and OFF with the brake pedal released?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the HS-CAN .
- No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamp switch fault.
G4 MONITOR THE INITIAL (BRAKE PEDAL NOT APPLIED) BRAKE PRESSURE USING THE ABS MODULE BRAKE PRESSURE (BRAKPRES) PID
- Enter the following diagnostic mode on the scan tool: Data Logger - ABS Module.
- With the brake pedal not applied, record the pressure displayed by the BRAKPRES PID.
Is the initial brake pressure less than 275 kPa (40 psi) with the brake pedal not applied?
- Yes : GO to G5 .
- No : INSTALL a new HCU . REFER to HYDRAULIC CONTROL UNIT (HCU) .
G5 MONITOR THE BRAKPRES PID WHILE APPLYING THE BRAKE PEDAL
- Enter the following diagnostic mod e on the scan tool: Data Logger - ABS Module.
- Firmly press and release the brake pedal while monitoring the BRAKPRES PID.
Does the PID increase with firm pressure on the brake pedal and then decrease with the brake pedal released?
- Yes : The system is operating correctly at this time. The concern may have been caused by an incorrectly installed stoplamp switch.
- No : INSTALL a new HCU . REFER to HYDRAULIC CONTROL UNIT (HCU) .