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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System Diagnosis - 2.0L (1 Of 3) (Except HEV)) >> DTC P0087: Fuel Rail/System Pressure - To Low >> System Inspection

System Inspection

WARNING: This page is about a different variant/trim than selected.

■ Fuel leakage Inspection 

  1. Check following components visually.
    • Connector connection state
    • Damage/connection state for vacuum hoses connected to fuel line
    • Bent/pressed/twisted fuel line or fuel leakage
  2. Has a problem found in this procedure?

    YES 

    NO 

    • Go to "Check Low pressure fuel line" as follows

■ low pressure fuel line Inspection 

NOTE:
  1. Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.
  2. The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury or fire damage to vehicle components.
  1. IG "OFF". Remove Fuel Pump Fuse (20A).
  2. Start engine and wait until it stalls.
  3. IG "OFF". Install Fuel Pump Fuse (20A).
  4. Install the fuel pressure gauge to the delivery pipe with the fuel pressure gauge adaptor.
  5. Activate the fuel pump, and with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
  6. Measure the fuel pressure at idle.

    Specification:  440 ~ 460 kPa (4.48 ~ 4.69 kg/cm2 , 63 ~ 66 psi)

  7. Is the measured fuel pressure within specifications?

    YES 

    • Go to "Component Inspection" procedure below.

    NO 

    Condition Possible Cause
    Fuel Pressure is too low Fuel filter, fuel pressure sensor, in-tank fuel hose or the fuel pump, Fuel pump
    Fuel Pressure is too high Fuel pressure sensor, hose or pipe

■ High Pressure Fuel Pump performance Inspection 

  1. Connect GDS to DLC (Data Link Cable).
  2. Warm up the engine to normal operating temperature.
  3. Monitor "Fuel Pressure" parameter on the "Current Data" with GDS.

    Specification:  The fuel rail pressure will be increased while accelerating the vehicle.

    Fig 1: Screen Display - Normal Current Data At Acceleration And Deceleration
    G11992317Courtesy of HYUNDAI MOTOR AMERICA
  4. Is the parameters displayed correctly?

    YES 

    NO 

    • If there is no leakage at injector, go to "Component Inspection" procedure below.
    • Check high pressure fuel pump referring to shop service information and if necessary, repair or replace and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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