Toyota Celica 2005 Repair Manual page 382

DTC P0340
DTC P0341
CIRCUIT DESCRIPTION
The camshaft position sensor (G2 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 en-
gine revolution based on the NE+ signals, and the cylinder and the angle of the VVT based on the combina-
tion of the G2 and NE+ signals.
DTC No.
S No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)
P0340
S No camshaft position sensor signal to ECM with engine
speed 600 rpm or more (1 trip detection logic)
While crankshaft rotates twice, camshaft position sensor signal
is input to ECM 12 times or more (1 trip detection logic)
P0341 S Hint:
Under normal condition, the camshaft position sensor signal
is input into the ECM 3 times per 2 engine revolutions
G and NE Signal Waveforms
G
NE
20 msec./Division (Idling)
G
NE
10 msec./Division (Idling)
2005 CELICA (RM1131U)
DIAGNOSTICS
Camshaft Position Sensor "A" Circuit
(Bank 1 or Single Sensor)
Camshaft Position Sensor "A" Circuit
Range/Performance
DTC Detection Condition
Reference: Inspection by using the oscilloscope.
HINT:
5 V
The correct waveform is as shown on the left.
/Division
5 V
/Division
A21568
− ENGINE (1ZZ−FE)
S Open or short in camshaft position sensor circuit
S Camshaft position sensor
S Camshaft timing pulley
S Timing chain has a jumped tooth
S ECM
Item
Terminal
Equipment Setting
Condition
381
Trouble Area
Contents
CH1: G+ − NE−
CH2: NE+ − NE−
5V/Division, 20ms/Division
During cranking or idling
DI−183
DIC6V−02