Signal Circuit Inspection

Ignition "ON" & Engine "OFF".
Press the brake pedal.
Measure voltage between terminal "1" of the pressure sensor harness connector and chassis ground by using the oscilloscope.
Specification: 0.2 ± 0.1 V-4.8 ± 0.1 V

Fig 1: Measuring Voltage Between Pressure Sensor Harness Connector Terminal No. 1 & Chassis Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is the measured voltage within specifications?
YES : --> Go to "COMPONENT INSPECTION " procedure.

NO : --> Check for damaged harness and poor connection in pressure sensor harness between terminal "1" of the pressure sensor harness connector and terminal "12" of the HECU harness connector. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

--> If OK, 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.