Kia Optima Hybrid: Engine Control System / Knock Sensor (KS) Description and Operation

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Engine Control/Fuel System / Engine Control System / Knock Sensor (KS) Description and Operation

Description

Knocking is a phenomenon 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. When a knock occurs, the sensor produces voltage signal. The ECM retards the ignition timing when knocking occurs. 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.

Camshaft Position Sensor (CMPS) Repair procedures

Inspection 1. Check the signal waveform of the CMPS and CKPS using the GDS. Specification: Refer to “Wave Form” Removal • Do not remove the camshaft position sensor while engine is ...

Knock Sensor (KS) Specifications

Specification ItemSpecificationCapacitance (pF)850 ~ 1,150 ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: NVLD(Natural Vacuum Leakage Detection) Repair procedures

Removal 1. Turn the ignition switch OFF and disconnect the battery negative (-) terminal. 2. Disconnect the NVLD connector (A). 3. Disconnect the ventilation hoses (B,C). 4. Remove the NVLD after by loosening the bolts (A). Installation • Install the component with the specified torques. • Note that ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Fuel Pump Repair procedures

Removal 1. Release the residual pressure in fuel line (Refer to “Release Residual Pressure in Fuel Line” in this group). 2. Remove the fuel tank. (Refer to "Fuel Tank" in this group) 3. Disconnect the fuel tank pressure sensor & fuel pump connector (A). 4. Remove the plate cover (B) after removing ...