Knocking is a phenomenon characterized by undesirable
vibration and noise and can cause engine damage. The two Knock Sensor
(KS) are installed inside the V-valley of 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.
Inspection
Self Diagnosis With GDS
Smart key system defects can be quickly diagnosed with the
GDS. GDS operates actuator quickly to monitor, input/output value and
self diagnosis.
The following three features will be major problem in SMART KEY system.
1.
Problem in SMART KEY unit input.
...
Removal
•
Take care not to scratch the crash pad and related parts.
1.
Disconnect the negative (-) battery terminal.
2.
Remove the AVN monitor.
(Refer to "AVN System" - "AVN Head Unit")
3.
Remove the TMU unit (A) after loosening the mounting ...