Component Description
NCEC0220
The camshaft position sensor is a basic component of the engine
control system. It monitors engine speed and piston position.
These input signals to the engine control system are used to con-
trol fuel injection, ignition timing and other functions.
The camshaft position sensor has a rotor plate and a wave-form-
ing circuit. The rotor plate has 360 slits for a 1° (POS) signal and
4 slits for a 180° (REF) signal. The wave-forming circuit consists
of Light Emitting Diodes (LED) and photo diodes.
The rotor plate is positioned between the LED and the photo diode.
The LED transmits light to the photo diode. As the rotor plate turns,
the slits cut the light to generate rough-shaped pulses. These
pulses are converted into on-off signals by the wave-forming circuit
and sent to the ECM.
The distributor is not repairable and must be replaced as an
assembly except distributor cap and rotor head.
ECM Terminals and Reference Value
NCEC0221
Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
66*1
L
Camshaft position sen-
sor (Reference signal)
[Engine is running]
I
Warm-up condition
I
Idle speed
0.1 - 0.4V
SEF006W
75
L
[Engine is running]
I
Engine speed is 2,000 rpm
0.1 - 0.4V
SEF007W
*1: Models before VIN - P11U0548750
SEF998R
Rotor head
Sealed
cover
Ignition coil
with power
transistor
Light
emitting
diode
Photo diode
SEF853B
180° signal slit for No. 1 cylinder
1° signal slit
180° signal slit
Rotor plate
DTC P0340 CAMSHAFT POSITION SENSOR (CMPS)
SR20DE
Component Description
EC-239