Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di eg5vzfe cip0300p
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DI-57
DIAGNOSTICS - ENGINE (5VZ-FE)
DI8XH-02
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.
2002 4RUNNER (RM887U)
Author : Date : 233
DI-58
DIAGNOSTICS - ENGINE (5VZ-FE)
DTC No. DTC Detecting Condition Trouble Area
S Open or short in engine wire
Misfiring of random cylinders is detected during any particular
P0300 S Connector connection
200 or 1,000 revolutions
S Vacuum hose connector
S Ignition system
S Injector
For any particular 200 revolutions for engine, misfiring is de-
S Fuel pressure
P0301 tected which can cause catalyst overheating
S Mass air flow meter
P0302 (This causes MIL to blink)
S Engine coolant temp. sensor
P0303
S Compression pressure
P0304
For any particular 1,000 revolutions of engine, misfiring is de- S Valve clearance
P0305
tected which causes a deterioration in emission S Valve timing
P0306
(2 trip detection logic) S PCV valve and hose
S ECM
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
Injector 6
B-R R #10
E10
2 1
No. 1
5
B-R W #20
E10
2 1
I14 No. 2
Driver Side J/B 4
IG SW B-R G #30
4 7 B-R 1 E10
W-R B-R B-R 2 1
1I 1J II4 No. 3
7 6 3
B-R R-B
E10 #40
2 1
No. 4
2 1
B-R L #50
E10
Engine 2 1
2
AM2
No. 5 8
Room Y
1 B-R #60
R/B E10
2 1
2 No. 6 4
W-B E01
E9
W 5
W-B E02
E9
Battery
EC
A07547
A12632
CONFIRMATION DRIVING PATTERN
(a) Connect the TOYOTA hand-held tester or OBD II scan tool.
(b) Record DTC and the freeze frame data.
(c) Use the TOYOTA hand-held tester to set to the check mode (See page DI-3 ).
2002 4RUNNER (RM887U)
Author : Date : 234
DI-59
DIAGNOSTICS - ENGINE (5VZ-FE)
(d) Drive the vehicle several times with the engine speed, load and its surrounding range shown with the
ENGINE SPD, CALC LOAD in the freeze frame data or the 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 the MISFIRE RPM, MISFIRE LOAD in
the data list for the following period of time.
Engine Speed Time
Ignition 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
(e) Check whether there is misfire or not by monitoring DTC and the freeze frame data. After that, record
them.
(f) Turn the ignition switch OFF and wait at least 5 seconds.
INSPECTION PROCEDURE
HINT:
S If is 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 was warmed up or not, the
air-fuel ratio was 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 the SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame
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