Fig 1) Normal value with rail pressure sensor at idle speed.

4. Is the Current data displayed correctly ?

YES

▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure .

NO

▶ Go to "W/Harness Inspection" procedure.