ENGINE - 2AZ-FXE ENGINE
214CE08
Steel Weight
Inertia
Piezoelectric
Element
214CE06
Piezoelectric
Element
Flat Type Knock Sensor
200 k
Ω
Open / Short Circuit
Detection Resistor
KNK1
EKNK
THS ECU
5 V
200 k
Ω
IC
Service Tip
In accordance with the adoption of open/ short circuit detection resistor, the inspection method
for the sensor has been changed. For details, refer to 2007 Camry Hybrid Vehicle Repair
Manual (Pub. No. RM02H0U).
To prevent the water accumulation in the connector, make sure to install the flat type knock
sensor in the position as shown in the following illustration.
10
10
Knock Sensor
251EG12
EG-40
3) Operation
The knocking vibration is transmitted to the
steel weight and its inertia applies pressure to
the piezoelectric element. The action
generates electromotive force.
4) Open / Short Circuit Detection Resistor
During the power source is IG-ON, the open/ short circuit detection resistor in the knock sensor and the
resistor in the THS ECU keep the voltage at the terminal KNK1 of engine constant.
An IC (Integrated Circuit) in the THS ECU is always monitoring the voltage of the terminal KNK1. If
the open / short circuit occurs between the knock sensor and the THS ECU, the voltage of the terminal
KNK1 will change and the THS ECU detects the open/ short circuit and stores DTC (Diagnostic Trouble
Code).