3.
Has a problem been found?
YES
a.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
a.
Go to "Signal Circuit Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
Go to "Signal Circuit Inspection" procedure.
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±0.1V ~ 4.8±0.1V
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.
