Pinpoint Test G : C116A, C1440: Notes
Normal Operation and Fault Conditions
The pressure transducer is integral to the HCU. The pressure transducer sends a signal to the ABS module which varies in relation to the amount of pressure applied to the brake pedal. The more pressure applied, the greater the signal sent to the ABS module. If a new pressure transducer is needed, then a new HCU must be installed.
When the brake pedal is pressed, the stoplamp switch closes and voltage is sent to the PCM. The PCM then sends a message over the HS-CAN to the ABS module indicating the brake pedal has been pressed. DTCs set in the ignition cycle can only be cleared by cycling the ignition off and on once the fault has been corrected.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C116A | ABS Pressure Transducer / Brake Switch Mismatch | This DTC sets in every ignition cycle if, during normal operation, the stoplamp switch message does not match the HCU transducer, both signals have to agree on whether the brakes are being applied or not. |
| C1440 | Pressure Transducer Main / Primary Signal Faulted | This DTC sets in every ignition cycle if the pressure transducer signal sent to the ABS module does not agree with the stoplamp switch position. |
Possible Causes
- Network communication concern
- Stoplamp switch
- HCU
Visual Inspection and Diagnostic Pre-checks
- Make sure the brake pedal switch electrical connector is connected and free of corrosion and other contaminants.
- Make sure the brake pedal switch is installed correctly.
- Make sure the brake pedal switch is operating correctly.