4.
Measure voltage between terminal 1 of the rail pressure regulator harness connector and chassis ground.
Specification : Approx. 11.5 ~ 13.5V
Many malfunctions in the electrical system are caused by poor harness 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 go to "Verification of Vehicle Repair" procedure.
NO
Go to "W/Harness Inspection" procedure.
Ignition "OFF" & Engine "OFF".
Disconnect Rail Pressure regulator connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 1 of the rail pressure regulator harness connector and chassis ground.
Specification : Approx. 11.5 ~ 13.5V
Is the measured voltage within specifications ?
YES
▶ Go to " Control Circuit Inspection" procedure.
NO
▶ Check for short to battery in the power harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to battery in harness.
Ignition "OFF".
Disconnect Rail pressure regulator connector.
Measure resistance between terminal 2 of rail pressure regulator harness connector and chassis ground.
Specification : Infinite
Is the measured resistance within specifications ?
YES
▶ Go to " Check for open in harness " as below.
NO
▶ Check for short to ground in ground harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure .
Check for open in harness.
Ignition "OFF".
Disconnect Rail pressure regulator and ECM connector.
Measure registance between terminal 2 of rail pressure regulator harness connector and terminal 28 of ECM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications ?
YES
▶ Go to " Component Inspection " procedure.
NO
▶ Check for open in ground harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
