Lexus ES300 (1997 year). Manual — part 320
–
DIAGNOSTICS
ENGINE
DI–57
209
1997 LEXUS ES300 (RM511U)
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
P0300
Misfiring of random cylinders is detected during the any
particular 200 or 1,000 revolutions
Ignition system
Injector
P0301
P0302
P0303
For any particular 200 revolutions for the engine, misfiring is
detected which can cause catalyst overheating
(This causes MIL to blink)
j
Fuel line pressure
EGR
Compression pressure
Valve clearance not to specification
P0303
P0304
P0305
P0306
For any particular 1,000 revolutions of the engine, misfiring is
detected which causes a deterioration in emission
(2 trip detection logic)
Valve clearance not to specification
Valve timing
Mass air flow meter
Engine coolant temp. sensor
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.
DI09O–01
S05469
Instrument
Fusible
Link
Block
Engine
Battery
FL
MAIN
B–G
B–R
B–R
B–R
W–R
J22
Junction
Connector
B–R
B–R
B–R
B–R
B–R
B–R
2
2
2
2
2
2
1
1
1
1
1
1
L
R
Y
W
R–L
G
E10
E10
E10
E10
E10
E10
E10
E10
Ignition
Switch
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
Injector
BR
BR
ED
IK3
10
9
34
33
8
7
6
5
#10
#20
#30
#40
#50
#60
E01
E02
ECM
12
2L
2A
AM2
4
1
B
F6
F8
1
1
6
7
1K
1K
1C
1B
3
8
5
5
Panel J/B
Room
J/B
FI6588 FI6538
A00064
10V
/Division
10V
/Division
GND
GND
100 m sec./Division (Idling)
1 m sec./Division (Idling)
Injection duration
(Magnification)
DI–58
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DIAGNOSTICS
ENGINE
210
1997 LEXUS ES300 (RM511U)
WIRING DIAGRAM
Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
With the engine idling, measure between terminals #10
∼
#60 and E01 of ECM.
HINT:The correct waveform is as shown.
A00221
P25779
P23917
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DIAGNOSTICS
ENGINE
DI–59
211
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a)
Remove the ignition coil (See page
(b)
Remove the spark plug.
CHECK:
(1)
Check spark plug type.
(2)
Check for carbon deposits on electrode.
(3)
Check electrode gap.
OK:
(1) Twin ground electrodes type.
Recommended spark plug:
ND PK20TR11
NGK BKR6EKPB–11
(2) No large carbon deposit present.
Not wet with gasoline or oil.
(3) Electrode gap: 1.1
∼
1.3 mm (0.043
∼
0.051 in.)
PREPARATION:
(a)
Install the spark plug to the ignition coil, and connect the
ignition coil connector.
(b)
Disconnect injector connector.
(c)
Hold the end about 12.5 mm (0.5 in.) from the ground.
CHECK:
Check if spark occurs while engine is being cranked.
NOTICE:To prevent excess fuel being injected from the
injectors during this test, don’t crank the engine for more
than 5
∼
10 sec. at a time.
OK:
Spark jumps across electrode gap.
NG
Replace or check ignition system
(See page
OK
A00222
ON
(+)
#10
(+)
#20
(+)
#40
(+)
#50
(+)
#60
(+)
#30
BE6653
P24319
DI–60
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DIAGNOSTICS
ENGINE
212
1997 LEXUS ES300 (RM511U)
2
Check voltage of ECM terminal for injector of failed cylinder.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between applicable terminal of ECM connec-
tor and body ground.
OK:
Voltage: 9
∼
14 V
OK
Go to step 4.
NG
3
Check resistance of injector of misfiring cylinder (See page
).
NG
Replace injector.
OK
Check for open and short in harness and
connector between injector and ECM
(See page
).
4
Check fuel pressure (See page
NG
Check and repair fuel pump, fuel pipe line and
filter (See page
).
OK
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