Toyota ZZT230 series Repair Manual page 338

Check operation of OCV.
2
.... .
.... .
) 0
Check voltage between terminals OCV+ and OCV-
3
CCV Signal
GND
A
m sec./Divisi o n
1
) c::J
DIAGNOSTICS
PREPARATI O N:
CHECK:
Start the engine.
( a)
(b)
RESULT:
A09101
Reference: I N SPECTI O N USI N G OSCI L LOSCOPE
5 VI
Waveform
Turn the ignition switch ON, check waveform between terminals
Division
•
OCV+ and OCV- of the ECM connector.
•
HINT:
A)
*:
in
turns to normal in a short time.
objects are ejected, there is no problem about
also no problem since the oil filter should get the foreign object
in the engine oil.
ENGINE
Check the engine speed when disconnect the OCV con­
nector.
Check the engine speed when apply battery positive volt­
age between terminals of OCV.
Rosult
Normal engine speed
of
The correct waveform is as shown .
The waveform frequency (A) is lengthened as the engine
speed becomes higher.
OK syst e m I s OK. *
VVT
DTC P1349 is also output after the foreign object is caught
some part of the system in the engine oil and the system re­
Check{b}
Check (a}
Rough idle or engino sial!
ECM connector.
As
VVT.
ECM controls so that foreign
Dl-127
There is