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G34776
G and NE+ Signal Waveforms
G
NE+
10 msec. / D ivision ( Idling)
--
DIAGNOSTICS
ECD SYSTEM (1ND -- TV)
05 -- 111
COROLLA Supplement (RM1129E)
DTC P0340 CAMSHAFT POSITION SENSOR ” A”
CIRCUIT (BANK 1 OR SINGLE SENSOR)
CIRCUIT DESCRIPTION
The Camshaft Position (CMP) sensor installed on the cylinder head. The sensor plate has one tooth on its
circumference, and is installed on the camshaft timing pulley. When the camshaft rotates, the tooth on the
camshaft timing pulley passes through the CMP sensor. The generated voltage in the sensor acts as a sig -
nal. The ECM locates each cylinder position based on the combination of this signal and crankshaft position
sensor output.
DTC No.
DTC Detection Condition
Trouble A rea
P 0340
No camshaft position s ensor signal to ECM while cranking
(The M IL i s i l l um i nated as wel l as a DTC bei ng s et i m m edi atel y
S
Open or short i n CMP sensor circuit
S
CMP s ensor
P0340
(The MIL i s illuminated as well as a DTC being set i mmediatel y
malfunction is detected)
CM P s ens or
S
Camshaft timing gear or sprocket
S
ECM
HINT:
DTC P0340 is detected when the engine cranks 5 revolutions or more and also detected when idling.
Reference: Inspection using the oscilloscope.
HINT:
S
The correct waveform is as shown on the left.
S
G stands for the camshaft position sensor signal, and
NE+ stands for the crankshaft position sensor signal.
Item
Contents
Terminal
CH1: G -- EG
CH2: NE+ -- NE--
Equipment Setting
10ms/Division
Condition
While cranking or idling
WIRING DIAGRAM
Refer to DTC P0335 on page 05 -- 107 .
INSPECTION PROCEDURE
HINT:
Read freeze frame data using an intelligent tester ll. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction oc-
curred.
05MRZ--01
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E