Toyota Celica 2005 Repair Manual page 676

DTC P0335
DTC P0339
CIRCUIT DESCRIPTION
The crankshaft position sensor (NE signal) consists of a magnet, iron core and pickup coil.
The NE signal plate (crankshaft position sensor plate) has 34 teeth and is installed on the crankshaft. The
NE signal sensor generates 34 signals for each engine revolution. This sensor monitors a plate (timing rotor)
located on the crankshaft timing pulley and is used by the ECM to detect crankshaft angle and engine speed
(RPM/NE). As the crankshaft timing pulley rotates through an engine revolution, this sensor communicates
the rotation of the NE signal plate as a pulse signal to the ECM. Based on the signal, the ECM controls fuel
injection time and ignition timing.
DTC No.
No crankshaft position sensor signal to ECM during cranking
(2 trip detection logic)
P0335
No crankshaft position sensor signal to ECM with engine
speed 600 rpm or more (2 trip detection logic)
In conditions (a), (b) and (c), no crankshaft position sensor
(NE+) signal is input for 0.05 second or more
(a) Engine revolution is 1,000 rpm or more
P0339
(b) STA signal is OFF
(c) 3 seconds or more have elapsed after STA signal is
switched from ON to OFF
G and NE Signal Waveforms
G
NE
20 msec./Division (Idling)
G
NE
10 msec./Division (Idling)
2005 CELICA (RM1131U)
DIAGNOSTICS
Crankshaft Position Sensor "A" Circuit
Malfunction
Crankshaft Position Sensor "A" Circuit
Intermittent
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
A21566
− ENGINE (2ZZ−GE)
S Open or short in crankshaft position sensor circuit
S Crankshaft position sensor
S Signal plate (crankshaft)
S ECM
Item
Terminal
Equipment Setting
Condition
675
Trouble Area
Contents
CH1: G+ − NE−
CH2: NE+ − NE−
5V/Division, 20ms/Division
During cranking or idling
DI−477
DIC7H−02