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