Mazda X-5. Manual — part 42

CONTROL SYSTEM

01–40–41

01–40

ENGINE COOLANT TEMPERATURE (ECT) SENSOR FUNCTION [LF]

E5U014018841N01

• Detects the engine coolant temperature.

End Of Sie

ENGINE COOLANT TEMPERATURE (ECT) SENSOR CONSTRUCTION/OPERATION [LF]

E5U014018841N02

• Installed on the water outlet.

• The ECT is a thermistor type, the resistance

changes according to the engine coolant
temperature.

• The resistance decreases if the engine coolant

temperature increases, and increases if the
engine coolant temperature decreases.

End Of Sie

ECT SENSOR

E5U140ZN5201

CPU

PCM

ECT
SENSOR

ECT SENSOR
RESISTANCE
CHARACTERISTIC

RESISTANCE

ENGINE
COOLANT
TEMPERATURE

LARGE

SMALL

LOW

HIGH

C3U0140S033

CONTROL SYSTEM

01–40–42

INTAKE AIR TEMPERATURE (IAT) SENSOR FUNCTION [LF]

E5U014018842N01

• Detects air temperature inducted in the engine.

End Of Sie

INTAKE AIR TEMPERATURE (IAT) SENSOR CONSTRUCTION/OPERATION [LF]

E5U014018842N02

• Built into the MAF sensor.

• The IAT sensor is a thermistor type, the

resistance changes according to the intake air
temperature.

• The resistance decreases if the intake air

temperature increases and conversely increases
if the intake air temperature decreases.

End Of Sie

IAT SENSOR

MAF SENSOR

C3U0140S034

PCM

IAT
SENSOR

CPU

IAT SENSOR
CHARACTERISTIC

RESISTANCE

INTAKE AIR
TEMPERATURE

LARGE

SMALL

LOW

HIGH

E5U140ZT5012

CONTROL SYSTEM

01–40–43

01–40

CRANKSHAFT POSITION (CKP) SENSOR FUNCTION [LF]

E5U014018220N01

• Detects the pulse wheel rotation pulse as the engine crank angle signal.

End Of Sie

CRANKSHAFT POSITION (CKP) SENSOR CONSTRUCTION/OPERATION [LF]

E5U014018220N02

• The CKP sensor is installed on the engine front cover.

• The crankshaft position sensor pulse wheel has 30 projections with 10 ° of crank angle between the rising edge

of each projection.

• The crankshaft position sensor consists of a Hall element with a magnetic sensor, and a processing circuit that

performs signal amplification and identification.

• The projections on the plate installed to the crankshaft pulley cause a change in the magnetic flux when they

pass near the magnetic sensor of the CKP sensor by the rotation of the crankshaft. The CKP sensor converts
the change in magnetic flux to a digital waveform (rectangular waves) by the processing circuit. The PCM
detects the engine speed and crankshaft position based on the crankshaft position waveforms.

End Of Sie

CPU

PCM

360˚

16 TOOTH

13 TOOTH

10˚

30˚

30˚

CKP OUTPUT
SIGNAL

CKP SENSOR

CKP
SENSOR
OUTPUT
SIGNAL

CKP SENSOR

PAINT MARK AT
5TH TOOTH

CENTER LINE OF
CKP SENSOR

EMPTY SPACE

PULSE WHEEL

ROTATION

E5U140ZT5013

CONTROL SYSTEM

01–40–44

CAMSHAFT POSITION (CMP) SENSOR FUNCTION [LF]

E5U014018230N01

• Detects the rotation angle of the intake-side camshaft.

End Of Sie

CAMSHAFT POSITION (CMP) SENSOR CONSTRUCTION/OPERATION [LF]

E5U014018230N02

• Installed on the engine head cover.

• Six pulses per one camshaft rotation are detected by a wide projection and a narrow projection installed on the

intake air side camshaft.

• The camshaft position sensor consists of a Hall element with a magnetic sensor, and a processing circuit that

performs signal amplification and identification.

• The projections on the camshaft cause a change in the magnetic flux when they pass near the magnetic sensor

of the CMP sensor by the rotation of the camshaft. The CMP sensor converts the change in magnetic flux to a
digital waveform (rectangular waves) by the processing circuit. The PCM detects the engine speed and
camshaft position based on the camshaft position waveforms.

End Of Sie

CPU

PCM

90˚

30˚

30˚

90˚

90˚

90˚

°

60

°

60

°

30

°

30

°

90

ROTATION

CMP SENSOR

CAMSHAFT

CMP SENSOR

CMP
SENSOR
OUTPUT
SIGNAL

CMP SENSOR
OUTPUT SIGNAL

E5U140ZT5660