P1185 is set when 1)rail press. is higher than target rail press. by 200~350bar in condition that rail press. is controlled by Fuel pressure regulator valve or 2)rail press. exceeds maximum limiting value. This code is due to 1)more than intended fuel supply to common rail or 2)poor return of fuel supplied to common rail or 3)short to high 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 above target rail pressure by more than 200~350bar at Fuel pressure regulator valve operating condition.- 5000ms
•
Rail pressure is above maximum limiting value(1750bar) at Fuel pressure regulator valve operating condition. - 240 ms | |||
Diagnostic Time |
•
Refer to threshold Value | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | NO | |||
Fuel Limit | YES | |||
Check Lamp | YES | |||
