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DI-132
DIAGNOSTICS - ENGINE (5VZ-FE)
DI0SD-15
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces
high-voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 2-cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with one igni-
tion coil. In the 2-cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end
of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark
plugs. The sparks of the 2 spark plugs pass simultaneously from the center electrode to the ground elec-
trode. The ECM determines ignition timing end outputs the ignition signals (IGT) for each cylinder. Based
on IGT signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time,
the igniter also sends an ignition confirmation signal (IGF) as a fail-safe measure to the ECM.
Ignition Coil
From Battery
Spark Plug
Camshaft G IGT1 IGC1 No.1 Cylinder
Position
Sensor
No.4 Cylinder
IGT2 IGC2 No.5 Cylinder
Crankshaft NE
Position ECM
Sensor
No.2 Cylinder
IGT3 IGC3 No.3 Cylinder
Various
Sensor
IGF No.6 Cylinder
EXT GND
To Tachometer
S00251
DTC No. DTC Detecting Condition Trouble Area
S Ignition system
Condition (a) is repeated 3 times consecutively during 6 con- S Open or short in IGF and IGT circuits from igniter to ECM
P1300 secutively IGT signals while engine is running (a) IGF signal is S Igniter
not input to ECM for 2 or more ignitions S Ignition coil
S ECM
2002 4RUNNER (RM887U)
Author : Date : 308
DI-133
DIAGNOSTICS - ENGINE (5VZ-FE)
WIRING DIAGRAM
I14
IG Switch Driver Side J/B ECM
1
B-R 4 7
B-R B-R
1I 1J II3
7 6
B-R
5V
I2
I14 Igniter Coil Igniter
B-R
9
W-R
To Spark 1
Plug R 10 11 IGT1
7 B-L
No.1 2 E10
B-R
2 1
L 2 6 10 IGT2
L-Y
No.2 2 E10
2 Engine
AM2
Room B-R
1 R/B 1
G 1 9
5 G-W IGT3
2 No.3 2 E10
4 2 IGF
B-Y
W
E10
W-B 3 8
To
Battery Combination
EC
Meter
A07550
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the 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 deter-
mining 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 of misfiring cylinder (See page DI-57 ).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN-28 ).
NG Repair or replace harness or connector.
2002 4RUNNER (RM887U)
Author : Date : 309
DI-134
DIAGNOSTICS - ENGINE (5VZ-FE)
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
ON
PREPARATION:
(a) Disconnect the igniter connector.
IGF
(b) Remove the glove compartment (See page SF-54 ).
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal IGF of the ECM connec-
(+) (-) tor and body ground.
OK:
A15320 Voltage: 4.5 - 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN-28 ).
4 Check for open and short in harness and connector in IGT signal circuit between
ECM and igniter (See page IN-28 ).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminals IGT1 - IGT3 of ECM connector and body
ground.
START PREPARATION:
Remove the glove compartment (See page SF-54 ).
IGT1 IGT2 IGT3 CHECK:
Measure the voltage between terminal IGT1 - IGT3 of the ECM
connector and body ground when the engine is cranked.
OK:
(+) (-) Voltage: More than 0.1 V and less than 4.5 V
A15321
2002 4RUNNER (RM887U)
Author : Date : 310
DI-135
DIAGNOSTICS - ENGINE (5VZ-FE)
IGT and Signal Waveform Reference: INSPECTION USING OSCILLOSCOPE
VOLT During idling, check waveform between terminals IGT1 - IGT3
5
IGT1 and E1, and IGF and E1 of the ECM connector.
0
5 HINT:
0 IGT2 The correct waveform is as shown.
5
0 IGT3
5 IGF
0 NG Check and replace ECM (See page IN-28 ).
20 msec./Division (Idling) P20870
OK
6 Disconnect igniter connector, and check voltage between terminals IGT1 - IGT3
of ECM connector and body ground.
START PREPARATION:
(a) Disconnect the igniter connector.
IGT1 IGT2 IGT3 (b) Remove the glove compartment (See page SF-54 ).
CHECK:
Measure the voltage between terminals IGT1 - IGT3 of the
ECM connector and body ground when the engine is cranked.
(+) (-) OK:
Voltage: More than 0.1 V and less than 5.0 V
A15321
NG Check and replace ECM (See page IN-28 ).
OK
7 Check voltage between terminal 9 of igniter connector and body ground.
ON START PREPARATION:
9 Disconnect the igniter connector.
CHECK:
Measure the voltage between terminal 9 of the igniter connec-
tor and body ground when the ignition switch is turned to ON
(+) and START position.
OK:
Voltage: 9 - 14 V
BE6653 (-)
P24329 A00124
NG Check and repair igniter power source circuit.
OK
2002 4RUNNER (RM887U)
Author : Date : 311
DI-136
DIAGNOSTICS - ENGINE (5VZ-FE)
8 Check for open and short in harness and connector between ignition switch and
ignition coil, and ignition coil and igniter (See page IN-28 ).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG-1 ).
NG Replace ignition coil.
OK
Replace igniter.
2002 4RUNNER (RM887U)
Author : Date : 312
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