Hyundai Accent (HC): Fuel Delivery System / Fuel Pressure Test

Hyundai Accent (HC) (2017 - 2022) Service Manual / Engine Control / Fuel System / Fuel Delivery System / Fuel Pressure Test

- Fuel Pressure Test

1.Release the residual pressure in fuel line.(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

   

• When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

2.Install the Special Service Tool (SST).

(1)Disconnect the fuel feed tube from the delivery pipe.

   

• There may be some residual pressure even after “Release Residual Pressure in Fuel Line” work, so cover the hose connection with a shop towel to prevent residual fuel from spilling out before disconnecting any fuel connection.

(2)Install the special service tool for measuring the fuel pressure in between the fuel feed tube and the fuel delivery pipe (Refer to the figure below).

3. Inspect fuel leakage on connections among the fuel feed tube, the delivery pipe, and the SST components with IG ON.

4. Measure Fuel Pressure.

(1)Start the engine and measure the fuel pressure at idle.

Fuel Pressure : 323 ~ 363 kPa (3.3 ~ 3.7 kgf/cm², 46.8 ~ 52.6 psi)

   

• If the fuel pressure differs from the standard value, repair or replace the related part (Refer to the table below).

Fuel PressureCauseRelated Part
Too LowFuel filter cloggedFuel Filter
Fuel leakageFuel Pressure Regulator
Too HighFuel pressure regulator valve stuckFuel Pressure Regulator

(2)Stop the engine, and then check for the change in the fuel pressure gauge reading.

Standard Value : The gauge reading should hold for about 5 minutes after the engine stops

   

• If the gauge reading should not be held, repair or replace the related part (Refer to the table below).

Fuel Pressure (After Engine Stops)CauseRelated Part
Fuel Pressure Drops SlowlyLeakage on injectorInjector
Fuel Pressure Drops ImmediatelyCheck valve of fuel pump stuck open Fuel Pump

(3)Turn the ignition switch OFF.

5.Release the residual pressure in fuel line.(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

   

• When removing the fuel pump fuse, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the GDS after completion of "Release Residual Pressure in Fuel Line" work.

6.Test End

(1)Remove the Special Service Tool (SST) from the fuel feed tube and the delivery pipe.

(2)Connect the fuel feed tube and the delivery pipe.

Fuel Delivery System

Clutch System

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Smart Key Unit

- Components Connector Pin Information NoConnector AConnector BConnector C 1-IGN 2 Relay outputBattery (+) 2SSB Switch 1 inputP CAN Low- 3Driver outside handle switch inputP CAN HighImmobilizer antenna power output 4-B CAN HighOutside handle antenna driver power output 5-B CAN LowOutside handle antenna assist power output 6-SSB Illumination (amber) outputBumper antenna power output 7RPM input-Interior antenna 1 power output 8Start feedback inputSSB Illumination (+) outputInterior a

Hyundai Accent (HC) (2017 - 2022) Service Manual: Injector

- Description A DPI (Dual Point Injection) system means a system with two injectors in one cylinder (intake port) and has a total of eight injectors.The injector is an electronically controlled fuel injector, a solenoid valve that supplies precisely calculated fuel to the engine in spray form for the optimal combustion. This helps satisfy various engine operating conditions.

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