Random/Multiple Cylinder Misfire Detected; Cylinder Misfire Detected - Toyota T100 1996 Service Manual

DI−58
DTC P0300
DTC P0301
DTC P0302
DTC P0303
DTC P0304
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.
Misfiring of random cylinders is detected during any
P0300
particular 200 or 1,000 revolutions
For any particular 200 revolutions for engine, misfiring is
P0301
detected which can cause catalyst overheating
P0302
(This causes MIL to blink)
P0303
For any particular 1,000 revolutions for engine, misfiring is
P0304
detected which causes a deterioration in emissions
(2 trip detection logic)
HINT:
When the 2 more codes for a misfiring cylinder are recorded repeatedly but no random misfire code is re-
corded, it indicates that the misfires were detected and recorded at different times.
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS

Random/Multiple Cylinder Misfire Detected

Cylinder 1 Misfire Detected
Cylinder 2 Misfire Detected
Cylinder 3 Misfire Detected
Cylinder 4 Misfire Detected
DTC Detecting Condition
− ENGINE (3RZ−FE)
S Ignition system
S Injector
S Fuel line pressure
S EGR
S Compression pressure
S Valve clearance not to specification
S Valve timing
S Mass air flow meter
S Engine coolant temp. sensor
Trouble Area
DI0TP−03