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:
Mass or volume air flow circuit
Dtc p0100 mass or volume air flow circuit
Dtc p0102 mass or volume air flow circuit
low input
Dtc p0103 mass or volume air flow circuit
high input
Circuit description
The maf (mass air flow) sensor measures the amount of air flowing through the
throttle valve. The ecm
uses this information ...
How to proceed with troubleshooting
1 Vehicle brought to workshop
2 Customer problem analysis
3 Check and clear dtcs and freeze frame data
4 Problem symptom confirmation
Symptom does not occur: go to
step 5
Symptom occurs: go to step 6
5 Symptom simulation
6 Dtc check
There is no
output: go to step 7
There is outp ...
Rear view monitor system precautions
■ Area displayed on screen
The rear view monitor system displays an image of the view from the bumper of
the rear area of the vehicle.
To adjust the image on the rear view monitor system screen.
• The area displayed on the screen may vary according to vehicle orientation
conditions.
...