178 / 1003
1.2L REVOTRON ENGINE
167
Cam Shaft sensor measures the speed of the
CAM shaft. The cam phase sensor is mounted on
cylinder head cover, with a gap of 1.0± 0.5mm
between cylinder head cover surface and sensor
tip. The sensor provides input signal to ECU to
determine the phase, i.e. the sensor provides
signal voltage when the target wheel passes
through the sensor. The position of target wheel
indicates the engine phase. Cam shaft sensor
contains a permanent magnet and a Hall IC. Due
to the rotation of a ferromagnetic target wheel in
front of Sensor, the magnetic field is modulated at
the place of the hall probe. With a tooth in front of
the sensor, the magnetic field increases, with a
slot it decreases. This modulation results in
changes of the output signal. The magnetic field is
evaluated by the hall probe in the ASIC.
SENSOR STAND ALONE DIAGNOSIS
With ignition key is 'ON' position, use multimeter
to measure the supply voltage across pin1 and
pin3, which should be 12V DC.
Measure the signal voltage across pin1 and pin2.
IV. KNOCK SENSOR
COMPONENT DETAILS
Knock Sensor consists of a piezoelectric element.
Piezoelectric elements generate voltage when
vibration or pressure is applied to them. The
Piezoelectric element in the knock sensor is tuned
to the Engine Knock Frequency.
COMPONENT LOCATION
The knock sensor is mounted on the cylinder
block.
PRELIMINARY CHECKS:
1. Faulty Knock Sensor
2. Check for P0327-11, P0328-12 - Improper
Wiring Harness Connections between Knock
Sensor and EMS ECU.