P1186 is set when rail press. is lower than target rail press. by 500~150bar for more than 1.0 sec. in condition that rail press. is controlled by Fuel pressure regulator valve. This code is due to 1)less than intended fuel supply to common rail or 2)excessive return of fuel supplied to common rail or 3)short to low voltage line in fuel press. sensor.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
Fuel pressure regulator valve (open stuck)
•
Rail pressure sensor (Output fixed at high voltage line) | ||
Enable Conditions |
•
Engine running | |||
Threshold Value |
•
Rail pressure is below target rail pressure by more than 500~170bar at Fuel pressure regulator valve operating condition.- 1.0sec
•
Rail pressure is below minimum limiting value(50~280bar) at rail Fuel pressure regulator valve operating condition.- 0.3sec | |||
Diagnostic Time |
•
Refer to threshold Value | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | NO | |||
Fuel Limit | YES | |||
Check Lamp | YES | |||
