Rail press. control valve(PCV) is installed in common rail and controls common rail pressure fast as regulating returning quantity of fuel which is delivered to common rail when fast rise of rail pressure is required like the moment of turning engine ON or when fast relief of pressure is required like at the point of deceleration.
The lower RPCV current is, the more fuel is supplied to common rail. Thus it leads rail pressure to be high. On the contrary, the higher RPCV current is, the less fuel is supplied to common rail.
P0089 is set when excessive current in control circuit of Rail Pressure control valve(integrated with high common rail) is detected for more than 0.22 sec.. This code is due to short to battery in control circuit or Rail Pressure control valve internal short.
Item | Detecting Condition | Possible Cause | |
DTC Strategy | ● Voltage monitoring | ● RPCV circuit ● RPCV component | |
Enable Conditions | ● IG KEY "ON" | ||
Threshold Value | ● Short to battery (control circuit of rail pressure control valve) | ||
Diagnostic Time | ● 220ms | ||
Fail Safe | Fuel Cut | NO | |
EGR Off | NO | ||
Fuel Limit | YES | ||
Check Lamp | YES |
Rail pressure control valve resistance | Operating frequancy |
3.42 ~ 3.78Ω (20℃) | 1000Hz(1KHz) |
