Toyota RM744U Automobile Parts User Manual


  Open as PDF
of 7
 
DI–64
–DIAGNOSTICS ENGINE
2000 CELICA (RM744U)
DTC P0300 Random/Multiple Cylinder Misfire Detected
DTC P0301 Cylinder 1 Misfire Detected
DTC P0302 Cylinder 2 Misfire Detected
DTC P0303 Cylinder 3 Misfire Detected
DTC P0304 Cylinder 4 Misfire Detected
CIRCUIT DESCRIPTION
Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in
the crankshaft rotation for each cylinder.
The ECM counts the number of times the engine speed change rate indicates that misfire has occurred. And
when the misfire rate equals or exceeds the count indicating that the engine condition has deteriorated, the
MIL lights up.
If the misfire rate is high enough and the driving conditions will cause catalyst overheating, the MIL blinks
when misfiring occurs.
DTC No. DTC Detecting Condition Trouble Area
SOpen or short in engine wire
SConnector connection
SVacuum hose connection
SIgnition system
P0300
P0301
P0302
P0303
P0304
Misfiring of random cylinders is detected during any particular
200 or 1,000 revolutions
For any particular 200 revolutions for the engine, misfiring is
detected which can cause catalyst overheating
(This causes MIL to blink)
gy
SInjector
SFuel pressure
SManifold absolute pressure sensor
SEngine coolant temp. sensor
SCom
p
ression
p
ressure
P0304
(Thi
s causes
MIL
t
o
bli
n
k)
S
C
ompress
i
on pressure
SValve clearance
SValve timing
SVVTL system (Locker arm)
SECM
HINT:
When the 2 or more codes for a misfiring cylinder are recorded repeatedly but no random misfire code is
recorded, it indicates that the misfires were detected and recorded at different times.
DI389–03
next