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P0088 Fuel Rail/System Pressure - Too High

AutoHex Online Help: Hyundai i20(PB) 2011
Component Location
General Description

RPS(Rail Pressure Sensor), consists of piezzo electric element, measures rail pressure inside of common rail.

ECM determines optimum fuel injection quantity at specific engine condition based on RPS signal. RPS signal is also used as rail pressure regualtor feed back signal in order to achieve optimum rail pressure at certain engine condition.

1. Connector

2. Measurement circuit

3. Sensor element(diaphragm)

4. Rail pressure

5. Fuel rail



DTC Description

P0088 is set when RPS output value is above the maximum value for 1.5 sec.. This code is due to the open in power circuit or the short to ground in signal circuit.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Pressure monitoring

RPS circuit

RPS component

Enable Conditions

Engine running

Threshold Value

Output value of Rail pressure is higher than maximum pressure(1777bar).

Diagnostic Time

1.5 second

Fail Safe

Fuel cut

NO

EGR Off

NO

Fuel Limit

YES

Check Lamp

YES

Specification
Diagnostic Circuit Diagram
Signal Waveform

Fig 1) This waveform shows the rise of RPS output voltage at rapid acceleration.