Page 1257 of 3115

A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8
Ignition Coil with Igniter Connector
A21023
E5
IGF2
IGF1
ECM Connector
DI-208
- DIAGNOSTICSENGINE
401 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector in IGF signal circuits be-
tween ECM and ignition coil with igniter.
PREPARATION:
(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil will
igniter connector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Ignition coil (I1-2) - IGF1 (E5-24)Below 1 W
Ignition coil (I2-2) - IGF2 (E5-23)Below 1 W
Ignition coil (I3-2) - IGF1 (E5-24)Below 1 W
Ignition coil (I4-2) - IGF2 (E5-23)Below 1 W
Ignition coil (I5-2) - IGF1 (E5-24)Below 1 W
Ignition coil (I6-2) - IGF2 (E5-23)Below 1 W
Ignition coil (I7-2) - IGF1 (E5-24)Below 1 W
Ignition coil (I8-2) - IGF2 (E5-23)Below 1 W
Ignition coil (I1-2) or IGF1 (E5-24) -
Body ground10 kW or higher
Ignition coil (I2-2) or IGF2 (E5-23) -
Body ground10 kW or higher
Ignition coil (I3-2) or IGF1 (E5-24) -
Body ground10 kW or higher
Ignition coil (I4-2) or IGF2 (E5-23) -
Body ground10 kW or higher
Ignition coil (I5-2) or IGF1 (E5-24) -
Body ground10 kW or higher
Ignition coil (I6-2) or IGF2 (E5-23) -
Body ground10 kW or higher
Ignition coil (I7-2) or IGF1 (E5-24) -
Body ground10 kW or higher
Ignition coil (I8-2) or IGF2 (E5-23) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1258 of 3115
A19522A19630
IGF1 IGF2(+) (+) E5
E7
ECM Connector
E1 (-)
- DIAGNOSTICSENGINE
DI-209
402 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGF1, IGF2 and E1 of ECM connector.
PREPARATION:
(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between the E5 and E7 ECM connectors.
OK:
Tester ConnectionSpecified Condition
IGF1 (E5-24) - E1 (E7-1)4.5 to 5.5 V
IGF2 (E5-23) - E1 (E7-1)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
Replace ignition coil with igniter.
Page 1259 of 3115

A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8
Ignition Coil with Igniter Connector
A21023
E5
IGT8 IGT2
IGT4
IGT5 IGT6
IGT3 IGT7
IGT1
ECM Connector
DI-210
- DIAGNOSTICSENGINE
403 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check for open and short in harness and connector in IGT signal circuit between
ECM and ignition coil with igniter.
PREPARATION:
(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil con-
nector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Ignition coil (I1-2) - IGT1 (E5-9)Below 1 W
Ignition coil (I2-2) - IGT2 (E5-8)Below 1 W
Ignition coil (I3-2) - IGT3 (E5-25)Below 1 W
Ignition coil (I4-2) - IGT4 (E5-11)Below 1 W
Ignition coil (I5-2) - IGT5 (E5-12)Below 1 W
Ignition coil (I6-2) - IGT6 (E5-26)Below 1 W
Ignition coil (I7-2) - IGT7 (E5-13)Below 1 W
Ignition coil (I8-2) - IGT8 (E5-10)Below 1 W
Ignition coil (I1-2) or IGT1 (E5-9) -
Body ground10 kW or higher
Ignition coil (I2-2) or IGT2 (E5-8) -
Body ground10 kW or higher
Ignition coil (I3-2) or IGT3 (E5-25) -
Body ground10 kW or higher
Ignition coil (I4-2) or IGT4 (E5-11) -
Body ground10 kW or higher
Ignition coil (I5-2) or IGT5 (E5-12) -
Body ground10 kW or higher
Ignition coil (I6-2) or IGT6 (E5-26) -
Body ground10 kW or higher
Ignition coil (I7-2) or IGT7 (E5-13) -
Body ground10 kW or higher
Ignition coil (I8-2) or IGT8 (E5-10) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1260 of 3115
A19522A19630
IGT2
IGT3 IGT4
IGT6IGT8
IGT1
IGT7 IGT5(+) (+) (+) (+)
(+)
(+) (+)
ECM Connector
E1 (-)
(+)
E7
E5
- DIAGNOSTICSENGINE
DI-21 1
404 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check voltage between terminals IGT1 - IGT8 and E1 of ECM connector and
body ground.
CHECK:
Measure the voltage between terminals the E5 and E7 ECM
connectors when the engine is cranked.
OK:
Tester ConnectionSpecified Condition
IGT1 (E5-9) - E1 (E7-1)
IGT2 (E5-8) - E1 (E7-1)
IGT3 (E5-25) - E1 (E7-1)
IGT4 (E5-11) - E1 (E7-1)M th 01V l th 45VIGT5 (E5-12) - E1 (E7-1)More than 0.1 V or less than 4.5 V
IGT6 (E5-26) - E1 (E7-1)
IGT7 (E5-13) - E1 (E7-1)
IGT8 (E5-10) - E1 (E7-1)
NG Replace ECM (See page SF-60).
OK
Page 1261 of 3115
A19522A19630
IGT2
IGT3 IGT4
IGT6IGT8
IGT1
IGT7 IGT5(+) (+) (+)
(+) (+)
(+)
(+) (+)
ECM Connector
E7E1 (-)E5
DI-212
- DIAGNOSTICSENGINE
405 Author: Date:
2004 LAND CRUISER (RM1071U)
6 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1 - IGT8 of ECM connector and body ground.
PREPARATION:
Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with igniter
connector.
CHECK:
Measure the voltage between terminals the E5 and E7 ECM
connectors when the engine is cranked.
OK:
Tester ConnectionSpecified Condition
IGT1 (E5-9) - E1 (E7-1)
IGT2 (E5-8) - E1 (E7-1)
IGT3 (E5-25) - E1 (E7-1)
IGT4 (E5-11) - E1 (E7-1)45VIGT5 (E5-12) - E1 (E7-1)4.5 V or more
IGT6 (E5-26) - E1 (E7-1)
IGT7 (E5-13) - E1 (E7-1)
IGT8 (E5-10) - E1 (E7-1)
NG Replace ECM (See page SF-60).
OK
Page 1262 of 3115
A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8Ignition Coil with
Igniter Connector
- DIAGNOSTICSENGINE
DI-213
406 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check ignition coil with igniter power source circuit.
PREPARATION:
Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with igniter
connector.
CHECK:
Measure the voltage between the terminal of the wire harness
side connector and body ground.
OK:
Tester ConnectionSpecified Condition
I1-1 - Body ground
I2-1 - Body ground
I3-1 - Body ground
I4-1 - Body ground9t 14VI5-1 - Body ground9 to 14 V
I6-1 - Body ground
I7-1 - Body ground
I8-1 - Body ground
OK Repair ignition coil with igniter.
NG
Page 1263 of 3115

A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8Ignition Coil with Igniter
1 234
5 678
A21030
Wire Harness Side:
I18
Ignition SwitchIG2
DI-214
- DIAGNOSTICSENGINE
407 Author: Date:
2004 LAND CRUISER (RM1071U)
8 Check for open and short in harness and connector between ignition switch and
ignition coil with igniter.
PREPARATION:
(a) Disconnect the I1, 2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.
(b) Disconnect the I18 ignition switch connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Ignition coil (I1-1) - IG2 (I18-6)Below 1 W
Ignition coil (I2-1) - IG2 (I18-6)Below 1 W
Ignition coil (I3-1) - IG2 (I18-6)Below 1 W
Ignition coil (I4-1) - IG2 (I18-6)Below 1 W
Ignition coil (I5-1) - IG2 (I18-6)Below 1 W
Ignition coil (I6-1) - IG2 (I18-6)Below 1 W
Ignition coil (I7-1) - IG2 (I18-6)Below 1 W
Ignition coil (I8-1) - IG2 (I18-6)Below 1 W
Ignition coil (I1-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I2-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I3-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I4-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I5-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I6-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I7-1) or IG2 (I18-6) -
Body ground10 kW or higher
Ignition coil (I8-1) or IG2 (I18-6) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ignition coil with igniter.
Page 1264 of 3115
A20596
Normal Catalyst
Abnormal Catalyst Waveform of
Heated Oxygen Sensor
(before Catalyst) Waveform of
Heated Oxygen Sensor
(before Catalyst)
Waveform of
Heated Oxygen Sensor
(after Catalyst) Waveform of
Heated Oxygen Sensor
(after Catalyst)
- DIAGNOSTICSENGINE
DI-215
408 Author: Date:
DTC P0420 Catalyst System Efficiency Below Threshold
(Bank 1)
DTC P0430 Catalyst System Efficiency Below Threshold
(Bank 2)
MONITOR DESCRIPTION
The vehicle is equipped with two heated oxygen sensors. One is mounted upstream from the TWC (Three-
Way Catalytic) converter (Front Oxygen Sensor, ºsensor 1º), the second is mounted downstream (Rear Oxy-
gen Sensor ºsensor 2º). The catalyst efficiency monitor compares the sensor 1 and sensor 2 signals in order
to calculate TWC ability to store the oxygen.
During normal operation, the TWC stores and releases oxygen as needed. This results in low oxygen varia-
tions in the post TWC exhaust stream as shown below.
DIC2G-01