Component Location
General Description

Fuel Pressure Regulator Valve(FPRV) is integrated with high pressure pump and controls common rail pressure as regulating the quantity of fuel which is delivered to common rail. In order to control rail pressure to be optimum to current driving condition, ECM controls fuel pressure regulator valve operating current(with the method of duty-control) using RPCV signal, RPM and APS signal. The lower Fuel pressure regulator valve current is, the more fuel is supplied to common rail.

DTC Description

P0253 is set when "0"A in control circuit of Fuel metering unit(integrated with high pressure pump) is detected for more than specified duration. This code is due to open or short to ground in control circuit or Fuel metering unit internal open.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Voltage monitoring

● FPRV circuit

● FPRV component

Enable Conditions

● IG KEY "ON"

Threshold Value

● Short to GND - 0.28 sec.

● Wiring open - 0.22 sec.

Diagnostic Time

● Refer to threshold value

Fail Safe

Fuel Cut

NO

EGR Off

NO

Fuel Limit

YES

Check Lamp

YES

Specification

Fuel pressure regulator valve resistance

Operating frequancy

2.9 ~ 3.15Ω (20℃)

185 Hz

Schematic Diagram
note
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Signal Waveform
Яндекс.Метрика