3.
Has a problem been found?
YES
a.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
a.
Go to "Power 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 "Power Circuit Inspection" procedure.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal "2" of the pressure sensor harness connector and chassis ground.
Specification : Approx. 5V
Is the measured voltage within specifications?
YES
Go to "Ground Circuit Inspection" procedure.
NO
Check for open or short to GND in pressure sensor harness between terminal "2" of the pressure sensor harness connector and terminal "37" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure. If OK, go to "Component Inspection" precedure.
Ignition "OFF".
Disconnect pressure sensor connector.
Measure resistance between terminal "3" of the pressure sensor harness connector and chassis ground.
Specification : Approx. below 1Ω
Is the measured resistance within specifications?
YES
Go to "Signal Circuit Inspection" procedure.
NO
Check for open or short in pressure sensor harness between terminal "3" of the pressure sensor harness connector and terminal "28" of the HECU harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal "1" of the pressure sensor harness connector and chassis ground.
Specification : 0.2±0.1V ~ 4.8±0.1V
Is the measured voltage within specifications?
YES
Go to "Component Inspection" procedure.
NO
Check for open or short 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.
