Lexus RX300 (MCU15). Manual — part 216
DI–96
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
DTC
P1300
Igniter Circuit Malfunction (No. 1)
DTC
P1305
Igniter Circuit Malfunction (No. 2)
DTC
P1310
Igniter Circuit Malfunction (No. 3)
DTC
P1315
Igniter Circuit Malfunction (No. 4)
DTC
P1320
Igniter Circuit Malfunction (No.5)
DTC
P1325
Igniter Circuit Malfunction (No.6)
CIRCUIT DESCRIPTION
A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces
high–voltage loss, and enhances the the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 1–cylinder ignition system which ignites one cylinder with one ignition coil. In the 1–cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug pass from the center
electode to the ground electrode.
The engine ECU determines ignition timing and outputs the ignition signals (IGT) for each cylinder. Based
on IGT signals, the power transistors in the igniter cuts off the current to the primary coil in the ignition coil
is supplied to the spark plug that are connected to the end of the secondary coil. At the same time, the igniter
also sends an ignition confirmation signal (IGF) as a fail–safe measure to the engine ECU.
DTC No.
DTC Detecting Condition
Trouble Area
P1300
P1305
P1310
P1315
P1320
P1325
No IGF signal to engine ECU while engine is running
S Open or short in IGF and IGT1 – 6 circuit from
ignition coil with igniter
S No. 1 – No. 6 ignition coil with igniter
S Engine ECU
DI84F–01
A14518
W–L (*1)
W–R (*2)
Engine Room J/B
F11 FL Block
AM2
3
6
Engine ECU
IGT1
E8
EB
1
1
B–Y
2
3
4
W
11
IG2
2I
AM2
1
1
IGT2
E8
12
IGT3
E8
13
IGF
E8
25
IGT4
E8
14
IGT5
E8
15
IGT6
E8
16
(*1): LHD
(*2): RHD
Battery
W
6
2C
7
Instrument Panel J/B
B
1
1C
3
1C
3
1G
12
1G
W–R
Noise
Filter
1
IH1
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–R
W–B
W–B
G–B
I6 Ignition Coil
and Igniter No. 6
W–B
W–B
W–B
4
2
1
3
I5 Ignition Coil
and Igniter No. 5
Y
W–B
4
2
1
3
B
B
B
B
I4 Ignition Coil
and Igniter No. 4
L–Y
W–B
W–B
B
4
2
1
3
Y–G
W–B
I3 Ignition Coil
and Igniter No. 3
4
2
1
3
B
B
B
B
B
W–B
L–R
4
3
1
2
I2 Ignition Coil
and Igniter No. 2
I1 Ignition Coil
and Igniter No. 1
W–B
1
I15
Ignition Switch
W–R
–
DIAGNOSTICS
ENGINE
DI–97
LEXUS RX300 (RM785E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
S
If DTC P1300 is displayed, check No. 1 ignition coil with igniter circuit.
S
If DTC P1305 is displayed, check No. 2 ignition coil with igniter circuit.
S
If DTC P1310 is displayed, check No. 3 ignition coil with igniter circuit.
S
If DTC P1315 is displayed, check No. 4 ignition coil with igniter circuit.
S
If DTC P1320 is displayed, check No. 5 ignition coil with igniter circuit.
S
If DTC P1325 is displayed, check No. 6 ignition coil with igniter circuit.
S
Read freeze frame data using hand–held tester. Because freeze frame 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.
A02033
IGF
ON
(+)
(–)
DI–98
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
1
Check spark plug and spark (See page IG–1).
NG
Go to step 4.
OK
2
Check for open and short in harness and connector in IGF and IGT signal circuit
between engine ECU and ignition coil with igniter (See page IN–32).
NG
Repair or replace harness or connector.
OK
3
Disconnect ignition coil with igniter connector, and check voltage between
terminals IGF of engine ECU connector and body ground.
PREPARATION:
(a)
Remove the engine ECU with connector still connected
(See page FI–70).
(b)
Disconnect the ignition coil with the igniter connector.
(c)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals IGF of the engine ECU
connector and body ground.
OK:
Voltage: 4.5 – 5.5 V
OK
Replace ignition coil with igniter.
NG
Check and replace engine ECU (See page
IN–32).
4
Check for open and short in harness and connector in IGT signal circuit between
engine ECU and ignition coil with igniter (See page IN–32).
A07629
ON
IGT1
IGT4
IGT2
IGT3
(+)
(–)
IGT5
IGT6
A06097
IGT Signal Waveform
5 V/
Division
IGT
GND
IGF
GND
20 msec./Division
A07629
ON
IGT1
IGT4
IGT2
IGT3
(+)
(–)
IGT5
IGT6
–
DIAGNOSTICS
ENGINE
DI–99
LEXUS RX300 (RM785E)
NG
Repair or replace harness or connector.
OK
5
Check voltage between terminals IGT1 – 6 of engine ECU connector and body
ground.
PREPARATION:
Remove the engine ECU with connector still connected (See
page FI–70).
CHECK:
Measure voltage between terminals IGT1 – 6 of the engine
ECU connector and body ground when the engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference: INSPECTION USING OSCILLOSCOPE
During cranking or idling, check waveform between terminals
IGT1 – 6 and E1 of the engine ECU connector.
HINT:
Correct waveform appears as shown, with rectangle waves.
NG
Check and replace engine ECU (See page
IN–32).
OK
6
Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1 – 6 of engine ECU connector and body ground.
PREPARATION:
(a)
Remove the engine ECU with connector still connected
(See page FI–70).
(b)
Disconnect the ignition coil with the igniter connector.
CHECK:
Measure voltage between terminals IGT1 – 6 of the engine
ECU connector and body ground when the engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
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