Kia Optima: Engine Control System / Knock Sensor (KS)
Specifications
Item
|
Specification
|
Capacitance (pF)
|
850 - 1,150
|
Description and operation
| • |
Knocking is a condition characterized by undesirable vibration and noise
and can cause engine damage.
|
| • |
Knock Sensor (KS) is installed on the cylinder block and senses engine
knocking.
|
| • |
When knocking occurs, the vibration from the cylinder block is applied
as pressure to the piezoelectric element.
At this time, this sensor transfers the voltage signal higher than the
specified value to the ECM and the ECM retards the ignition timing.
|
| • |
If the knocking disappears after retarding the ignition timing, the ECM
will advance the ignition timing.
This sequential control can improve engine power, torque and fuel economy.
|
Components and components location
Schematic diagrams
Harness Connector
Repair procedures
| 1. |
The engine control system can be more quickly diagnosed for troubles
by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")
KDS provides the following information.
| (1) |
Self diagnosis : Inspects and displays diagnostic trouble code
(DTC)
|
| (2) |
Sensor data : Checks the system input/output value status
|
| (3) |
Forced operation : Checks the system operating status
|
| (4) |
Additional function : Controls system options, zero point adjustment
and other functions
|
|
| 1. |
Turn the ignition switch OFF.
|
| 2. |
Disconnect the knock sensor connector.
|
| 3. |
Measure resistance between the knock sensor terminals 1 and 2.
|
| 4. |
Check that the resistance is within the specification.
|
Specification: Approximately. 4.87 MΩ [20°C (68°F)]
|
|
| 1. |
Disconnect the negative battery terminal.
|
| 2. |
Remove the intake manifold.
(Refer to Engine Mechanical System - "Intake Manifold")
|
| 3. |
Remove the knock sensor (A) after loosening the mounting bolt.
|
Knock sensor mounting bolt:
18.6 - 23.5 N·m (1.9 - 2.4 kgf·m, 13.7 - 17.4 lb·ft)
|
|
| • |
Install the component with the specified torque.
|
| • |
Note that internal damage may occur when the component is dropped.
In this case, use it after inspecting.
|
|
| 1. |
Install in the reverse order of removal.
|
Description and operation
Description
•
Camshaft Position Sensor (CMPS) is a hall sensor, which detects the camshaft
position by using a hall element.
...
Description and operation
Description
•
Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is
installed on both upstream and downstream of the Manifol ...
Other information:
Radial-ply tires provide improved tread life, road hazard resistance and smoother
high speed ride. The radial- ply tires used on this vehicle are of belted construction
and are selected to complement the ride and handling characteristics of your vehicle.
Radial-ply tires have the same load carr ...
Repair procedures
Removal and Installation
Engine Room Under Cover
1.
Remove the engine room under cover (A).
Tightening torque:
7.8 - 11.8 N•m (0.8 - 1.2 kgf•m, 5.8 - 8.7 lb•ft)
2.
Instal ...
Camshaft Position Sensor (CMPS)
Heated Oxygen Sensor (HO2S)