Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip0300p
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DI-63
DIAGNOSTICS - ENGINE
DI6V8-05
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
S Open or short in engine wire
S Connector connection
S Vacuum hose connection
S Ignition system
g y
P0300 Misfiring of random cylinders is detected during any particular S Injector
P0301 200 or 1,000 revolutions S Fuel pressure
P0302 For any particular 200 revolutions for the engine, misfiring is S Manifold absolute pressure sensor
P0303 detected which can cause catalyst overheating S Engine coolant temp. sensor
P0304 (This causes MIL to blink) S Compression pressure
S Valve clearance
S Valve timing
S ECM
S PCV piping
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.
2002 ECHO (RM884U)
Author : Date : 233
DI-64
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
I10
Instrument Panel J/B Ignition Instrument Panel J/B
Switch
7 1 6 5
W-R B-R B-R
1A 1O W-R 1O 1O
5 AM2 IG2 6
ECM
1 1 IE2
2 B-R I6 Injector No. 1
12
Engine Room R/B B-R B-O E7 #10
AM2 1 2
B-R I7 Injector No. 2 11
1 B-R B-Y E7 #20
1 1 2
B-R I8 Injector No. 3
B-R 25
B-L B-W #30
E7
1 2
F6 2 I9 Injector No. 4 24
B-R B-L
Fusible Link E7 #40
1 2
MAIN Block
13
BR
E7 E01
Battery
EB
A09054
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.
2002 ECHO (RM884U)
Author : Date : 234
DI-65
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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