Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Camshaft position sensor ”a”
circuit / Circuit description
Toyota Corolla (E120): Circuit description
The camshaft position sensor (g22+ signal) consists of a magnet, iron core and pickup coil.
The g22+ signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil changes, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The ne+ signal plate (crankshaft timing pulley) has 34 teeth and is installed to the crankshaft. The ne+ signal sensor generates 34 signals at every engine revolution. The ecm detects the crankshaft angle and the engine revolution based on the ne+ signals, and the cylinder and the angle of the vvt based on the combination of the g22+ and ne+ signals.
Reference: inspection using the oscilloscope.
Hint
: the correct waveform is as shown on the left.
Monitor description
If there is no signal from the camshaft position sensor despite the engine revolving, or if the rotation of the camshaft and the crankshaft is not synchronized, the ecm interprets this as a malfunction of the sensor.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Wiring diagram
Refer to dtc p0335
Other materials:
Catalyst monitor (o2s type)
Preconditions
The monitor will not run unless:
mil is off.
Engine coolant temperature (ect) is 176°f (80 °C) or greater.
Intake air temperature (iat) is 14°f (–10 °C) or greater.*
Notice:
* 2002 and later my vehicles:
the readiness test can be completed in cold ambient c ...
Changing the engine switch positions
1 “LOCK”
The steering wheel is locked and the key can be removed. (Vehicles with an automatic
transmission or continuously variable transmission: The key can be removed only
when the shift lever is in P.) 2 “ACC”
Some electrical components such as the audio system can be used.
3 “ON ...
Circuit description
When the brake pedal is depressed, the stop lamp switch assy sends a signal
to the cruise control ecu assy.
When the cruise control ecu assy receives this signal, it cancels the cruise
control.
A fail–safe function is provided so that cancel functions normally, even if
there is a malfu ...