Component Inspection

Ignition "ON" & Engine "OFF".
Put and release the brake pedal several times.
Measure voltage, waveform between terminal "1" of the pressure sensor (primary and secondary) harness connector and chassis ground.
Specification :

0.5V - 4.4V

Approx. 0.5V (in case of no braking)

Fig 1: Measuring Voltage Between Terminal 1 Of Pressure Sensor Connector And Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is the measured voltage, waveform within specifications?
YES
- Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known-good pressure sensor and check for proper operation. If problem is corrected, replace pressure sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.