Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0300p
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DI-57
DIAGNOSTICS - ENGINE
DI8B3-01
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
DTC P0305 Cylinder 5 Misfire Detected
DTC P0306 Cylinder 6 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.
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
Misfiring of random cylinders is detected during any S Ignition system
P0300 S Injector
particular 200 or 1,000 revolutions
S Fuel line pressure
ressure
S Compression pressure
For any particular 200 revolutions for engine, misfiring is
P0301 S Valve clearance not to specification
detected which can cause catalyst overheating
P0302 S Valve timing
(This causes MIL to blink)
P0303 S Mass air flow meter
P0304 S Engine coolant temp. sensor
For any particular 1,000 revolutions of engine, misfiring is
P0305 S Open or short in engine wire
detected which causes a deterioration in emission
P0306 S Connector connection
(2 trip detection logic)
S ECM
2001 SIENNA (RM787U)
Author : Date : 211
DI-58
DIAGNOSTICS - ENGINE
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.
WIRING DIAGRAM
ECM
Driver side J/B No.1
Injector
3 8 B-R 9 5
B-R B-R B-R 2 1 W
6
1K 1C IH1 E11 #10
No. 1 6
B-R 2 1 B
Ignition
E11 #20
Switch
5 No. 2 1
5 1
W-R B-R 2 B #30
7 1K 1B E12
W No. 3 2
B-R 2 1 L
E12 #40
4 2L No. 4
1 3
B-R 2 R
Engine E12 #50
AM2
Room
No. 5
J/B 1 4
B-R 2 G #60
No.2 E12
3 2B No. 6
21
B-L W W-B E01
E12
FL 31
MAIN W-B E02
E12
Battery EB
A14831
CONFIRMATION DRIVING PATTERN
(1) Connect the TOYOTA hand-held tester or OBD II scan tool.
(2) Record DTC and the freeze frame data.
(3) Use the TOYOTA hand-held tester to set to Check Mode. (See page DI-3 )
(4) Drive the vehicle several times with the engine speed, load and its surrounding range shown with
ENGINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the data list.
If you have no TOYOTA hand-held tester, turn the ignition switch OFF after the symptom is simulated
the first time. Then repeat the simulation process again.
HINT:
In order to memorize DTC of misfire, it is necessary to drive around MISFIRE RPM, MISFIRE LOAD in the
data list for the following period of time.
Engine Speed Time
Idling 3 minutes 30 seconds or more
1000 rpm 3 minutes or more
2000 rpm 1 minute 30 seconds or more
3000 rpm 1 minute or more
(5) Check whether there is misfire or not by monitoring DTC and the freeze frame data. After that, record
them.
(6) Turn ignition switch OFF and wait at least 5 seconds.
2001 SIENNA (RM787U)
Author : Date : 212
DI-59
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
HINT:
S If is the case that DTC besides misfire is memorized simultaneously, first perform the troubleshooting
for them.
S Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
data records the engine conditions when the malfunction is detected, when troubleshooting it is useful
for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel
ratio lean or rich, etc. at the time of the malfunction.
S When the vehicle is brought to the workshop and the misfire is not occurred, misfire can be confirmed
by reproducing the condition or freeze frame data. Also, after finishing the repair, confirm that there
is no misfire. (See the confirmation driving pattern)
S When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data
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