Kia Rio: Engine Control System / Injector

Kia Rio 2017-2020 YB Service Manual / Engine Control / Fuel System / Engine Control System / Injector

Specifications
Specification

Injector

Item
Specification
Coil Resistance (Ω)
Approximately 9.6
Minimum Injection Time (ms)
1.8
Fuel Pressure
bar
2 ~ 7
kPa
200 ~ 700
kgf/cm²
2.04 ~ 7.14
psi
29.0 ~ 101.5
Pin
2

Description and operation
Description

Based on information from various sensors, the ECM can calculate the fuel amount to be injected. The fuel injector is a solenoid-operated valve and the fuel injection amount is controlled by length of injection time. The ECM controls each injector by grounding the control circuit. When the ECM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the ECM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should momentarily peak.

Schematic diagrams
Circuit Diagram

Repair procedures
Inspection
1.

Turn ignition switch OFF.

2.

Disconnect injector connector.

3.

Measure resistance between injector terminals 1 and 2.

4.

Check that the resistance is within the specification.

Specification: Approximately 9.6

Removal
1.

Release the residual pressure in fuel line.

(Refer to “Release Residual Pressure in Fuel Line” in this group).

2.

Turn the ignition switch OFF and disconnect the battery negative (-) terminal.

3.

Remove the engine cover.

(Refer to Engine And Transaxle Assembly - "Engine Cover")

4.

Remove the wiring harness after loonsening the mounting bolts.

5.

Disconnect the injector connector (A).

6.

Remove the PCV hose (A).

7.

Disconnect the fuel feed tube (A) after loosening the mounting nuts (B).

Delivery pipe mounting nut (↔ Fuel feed tube):

18.6 - 23.5 N.m (0.4 - 0.6 kgf.m, 13.7 - 17.4 lb-ft)

8.

Remove the delivery pipe & injector assembly (A) after loosening the mounting bolts (B).

Delivery pipe mounting bolt:

7.8 - 11.8 N.m (1.9 - 2.4 kgf.m, 5.8 - 8.7 lb-ft)

9.

Remove the fixing clip (A), and then separate the injector from the delivery pipe.

Installation
  

Install the component with the specified torques.

Note that internal damage may occur when the component is dropped. In this case, use it after inspecting

Apply the engine oil to the injector O-ring.

Inspect the injector O-ring when installing.

1.

Installation is reverse of removal.

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