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:
Follow the Normal Maintenance Schedule if the vehicle is usually operated where
none of the following conditions apply. If any of the following conditions apply,
follow the Maintenance Under Severe Usage Conditions.
Repeated driving short distance of less than 8 km (5 miles) in normal temper ...
Description and operation
Description
Evaporative Emission Control System prevents fuel vapor stored in fuel tank from
vaporizing into the atmosphere. When the fuel evaporates in the fuel tank, the vapor
passes through vent hoses or tubes to canister filled with charcoal. The canis ...
Camshaft Position Sensor (CMPS)
Heated Oxygen Sensor (HO2S)