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DI-1 15
DIAGNOSTICS - ENGINE
DI8B4-01
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
elecrtode to the ground electrode.
The ECM 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 ECM.
DTC No. DTC Detecting Condition Trouble Area
P1300
S Ignition system
P1305
Condition (a) is repeated 3 times consecutively during 6 con- S Open or short in IGF or IGT circuit from ignition coil with ignit-
P1310
secutively IGT signals while engine is running er
P1315
(a) IGF signal is not input to ECM for 2 or more ignitions S Ignition coil with igniter
P1320
S ECM
P1325
2001 SIENNA (RM787U)
Author : Date : 269
DI-1 16
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
Instrument Panel J/B J13 I1 Ignition Coil
J/C and Igniter No. 1 Engine ECU
3 8 1 11
B-R B-R B-W W-B L-R
1K 1C IH1 E12 IGT1
B-R A A 4 3
5 5 B-W B
1K 1B 1 2
I2 Ignition Coil
B-W and Igniter No. 2 12
B-W 1 3
I15 E12 IGT2
G-R
Ignition Switch W-R W-B B
6 7 4 2
W
IG2 AM2 B-W W-B I3 Ignition Coil
and Igniter No. 3 13
B-W W-R
E12 IGT3
1 3
Engine Room J/B 25
W-B B B
3 AM2 4 E12 IGF
B-W 4 2
2B 2L W-B
I4 Ignition Coil B
and Igniter No. 4 14
B-W B-R
W 3 E12 IGT4
1
B-L W-B B
B-W 4 2
W-B I5 Ignition Coil B
and Igniter No. 5 15
B-W L-W
E12 IGT5
FL MAIN 1 3
W-B
B
B-W 4 2
Battery I6 Ignition Coil
W-B B
and Igniter No. 6 16
G-B
W-B
E12 IGT6
4 3
B-W
1 2
B-W W-B
1
Noise EC
Filter
A14827
2001 SIENNA (RM787U)
Author : Date : 270
DI-1 17
DIAGNOSTICS - ENGINE
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 If DTCs P1300, P1315 and P1325, are output simultaneously, IGF1 circuit may be open or short.
S If DTCs P1305, P1310 and P1320, are output simultaneously, IGF2 circuit may be open or short.
S Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. 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 was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Check spark plug and spark (See page DI-57 ).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF and IGT signal cir-
cuits between ECM and ignition coil with igniter (See page IN-31 ).
NG Repair or replace harness or connector.
OK
2001 SIENNA (RM787U)
Author : Date : 271
DI-1 18
DIAGNOSTICS - ENGINE
3 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGF of ECM connector and body ground.
ON PREPARATION:
IGF (a) Remove the glove compartment (See page SF-84 ).
(b) Disconnect the ignition coil with the igniter connector.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IGF of the ECM con-
(+) (-) nector and body ground.
OK:
A02033 Voltage: 4.5 - 5.5 V
OK Replace ignition coil with igniter.
NG
Check and replace ECM (See page IN-31 ).
4 Check for open and short in harness and connector in IGT signal circuit between
ECM and ignition coil with igniter (See page IN-31 ).
NG Repair or replace harness or connector.
OK
2001 SIENNA (RM787U)
Author : Date : 272
DI-1 19
DIAGNOSTICS - ENGINE
5 Check voltage between terminals IGT1 - IGT6 of ECM connector and body
ground.
ON PREPARATION:
IGT5 IGT4 IGT3 IGT2 IGT1 (a) Remove the glove compartment (See page SF-84 ).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IGT1 - IGT6 of the
ECM connector and body ground when the engine is cranked.
IGT6 (+) (-) OK:
Voltage: More than 0.1 V and less than 4.5 V
A07629
IGT Signal Waveform Reference: INSPECTION USING OSCILLOSCOPE
5 V/
Division During cranking or idling, check the waveform between termi-
nals IGT1 - IGT6 and E1 of the ECM connector.
IGT HINT:
GND Correct waveform appears as shown, with rectangle waves.
GND
IGF
NG Check and replace ECM (See page IN-31 ).
20 msec./ Division A06097
OK
6 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1 - IGT6 of ECM connector and body ground.
ON PREPARATION:
IGT5 IGT4 IGT3 IGT2 IGT1 (a) Remove the glove compartment (See page SF-84 ).
(b) Disconnect the ignition coil with the igniter connector.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IGT1 - IGT6 of the
IGT6 (+) (-) ECM connector and body ground when the engine is cranked.
OK:
A07629 Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN-31 ).
OK
2001 SIENNA (RM787U)
Author : Date : 273
DI-120
DIAGNOSTICS - ENGINE
7 Check ignition coil with igniter power source circuit.
ON PREPARATION:
Disconnect the ignition coil with the igniter connector.
1
CHECK:
START
Measure the voltage between terminal 1 of the ignition coil with
(-) (+)
the igniter connector and body ground when the ignition switch
is turned to ON and START position.
OK:
Voltage: 9 - 14 V
BE6653
A01761 A01861
NG Repair ignition coil with igniter power source
circuit.
OK
8 Check for open and short in harness and connector between ignition switch and
ignition coil with igniter (See page IN-31 ).
NG Repair or replace harness or connector.
OK
9 Check AM2 fuse.
Engine Room J/B PREPARATION:
Remove the AM2 fuse from the engine room J/B.
CHECK:
Check the continuity of the AM2 fuse.
OK:
Continuity
NG Check for short in all harness and components
AM2 Fuse connected to AM2 fuse.
S04162
OK
Replace ignition coil with igniter.
2001 SIENNA (RM787U)
Author : Date : 274
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