Page 1225 of 3115
A19431A19884
DI-176
- DIAGNOSTICSENGINE
369 Author: Date:
2004 LAND CRUISER (RM1071U)
6 Change normal spark plug and check spark of misfiring cylinder.
PREPARATION:
(a) Change to the normal spark plug.
(1) Remove the spark plug that may be faulty from the
ignition coil assembly.
(2) Install the spark plug to the ignition coil assembly.
(b) Disconnect the injector connector.
(c) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark jumps across electrode gap.
OK Replace spark plug.
NG
Page 1226 of 3115

A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8
Ignition Coil Connector
A21023
E5
IGF2
IGF1
ECM Connector
- DIAGNOSTICSENGINE
DI-177
370 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check for open and short in harness and connector between ignition coil and
ECM.
Check the harness and connector between the ignition coil
and the ECM (IGF terminal) connectors:
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) - 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
Page 1227 of 3115

A21025
Ignition Coil Connector
I1
I2
I3I4
I5I6
I7I8
Wire Harness Side:
A21023
E5
IGT8 IGT2
IGT4
IGT5 IGT6
IGT3 IGT7
IGT1
ECM Connector
DI-178
- DIAGNOSTICSENGINE
371 Author: Date:
2004 LAND CRUISER (RM1071U)
Check the harness and connector between the ignition coil
and the ECM (IGT terminal) connectors:
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 (I1-3) - IGT1 (E5-9)Below 1 W
Ignition coil (I2-3) - IGT2 (E5-8)Below 1 W
Ignition coil (I3-3) - IGT3 (E5-25)Below 1 W
Ignition coil (I4-3) - IGT4 (E5-11)Below 1 W
Ignition coil (I5-3) - IGT5 (E5-12)Below 1 W
Ignition coil (I6-3) - IGT6 (E5-26)Below 1 W
Ignition coil (I7-3) - IGT7 (E5-13)Below 1 W
Ignition coil (I8-3) - IGT8 (E5-10)Below 1 W
Ignition coil (I1-3) or IGT1 (E5-9) -
Body ground10 kW or higher
Ignition coil (I2-3) or IGT2 (E5-8) -
Body ground10 kW or higher
Ignition coil (I3-3) or IGT3 (E5-25) -
Body ground10 kW or higher
Ignition coil (I4-3) or IGT4 (E5-11) -
Body ground10 kW or higher
Ignition coil (I5-3) or IGT5 (E5-12) -
Body ground10 kW or higher
Ignition coil (I6-3) or IGT6 (E5-26) -
Body ground10 kW or higher
Ignition coil (I7-3) or IGT7 (E5-13) -
Body ground10 kW or higher
Ignition coil (I8-3) or IGT8 (E5-10) -
Body ground10 kW or higher
OK Replace ignition coil with igniter, then confirm
that there is no misfire.
NG
Repair or replace harness or connector.
Page 1228 of 3115
A19522A19630
#8 #7 #6
#5 #3#2
#1
(+) (+)(+)
(+)(+)
(+)
(+)
#4(+)
E01 (-)
ECM Connector
E5E6E7
- DIAGNOSTICSENGINE
DI-179
372 Author: Date:
2004 LAND CRUISER (RM1071U)
8 Check ECM terminal of misfiring cylinder.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between the terminals of the E5, E6 and
E7 ECM connectors.
OK:
Tester ConnectionSpecified Condition
#1 (E5-1) - E01 (E5-7)9 to 14 V
#2 (E5-2) - E01 (E5-7)9 to 14 V
#3 (E5-3) - E01 (E5-7)9 to 14 V
#4 (E5-4) - E01 (E5-7)9 to 14 V
#5 (E5-5) - E01 (E5-7)9 to 14 V
#6 (E6-3) - E01 (E5-7)9 to 14 V
#7 (E7-6) - E01 (E5-7)9 to 14 V
#8 (E7-5) - E01 (E5-7)9 to 14 V
OK Go to step 11.
NG
9 Check injector resistance of misfiring cylinder (See page SF-19).
NG Replace injector.
OK
Page 1229 of 3115

A21343
I9I10
I11I12
I13I14
I15I16
Wire Harness Side:
Injector Connector
A21344ECM Connector E6
E7
#4
#5#2
#1
#3#6#7
#8
E5
A21345
I18
Wire Harness Side:
Ignition Switch Connector
IG2
DI-180
- DIAGNOSTICSENGINE
373 Author: Date:
2004 LAND CRUISER (RM1071U)
10 Check for open and short in harness and connector between ignition SW and in-
jector, injector and ECM of misfiring cylinder.
Check the harness and the connector between the injector
connector and the ECM connector:
PREPARATION:
(a) Disconnect the I9, I10, I11, I12, I13, I14, I15 or I16 injector
connector.
(b) Disconnect the E5, E6 or E7 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Injector (I9-2) - #1 (E5-1)Below 1 W
Injector (I10-2) - #2 (E5-2)Below 1 W
Injector (I11-2) - #3 (E5-3)Below 1 W
Injector (I12-2) - #4 (E5-4)Below 1 W
Injector (I13-2) - #5 (E5-5)Below 1 W
Injector (I14-2) - #6 (E6-3)Below 1 W
Injector (I15-2) - #7 (E7-6)Below 1 W
Injector (I16-2) - #8 (E7-5)Below 1 W
Injector (I9-2) or #1 (E5-1) -
Body ground10 kW or higher
Injector (I10-2) or #2 (E5-2) -
Body ground10 kW or higher
Injector (I11-2) or #3 (E5-3) -
Body ground10 kW or higher
Injector (I12-2) or #4 (E5-4) -
Body ground10 kW or higher
Injector (I13-2) or #5 (E5-5) -
Body ground10 kW or higher
Injector (I14-2) or #6 (E6-3) -
Body ground10 kW or higher
Injector (I15-2) or #7 (E7-6) -
Body ground10 kW or higher
Injector (I16-2) or #8 (E7-5) -
Body ground10 kW or higher
Page 1230 of 3115

- DIAGNOSTICSENGINE
DI-181
374 Author: Date:
2004 LAND CRUISER (RM1071U)
Check the harness and connector between the injector
connector and the ignition switch:
PREPARATION:
(a) Disconnect the I9, I10, I11, I12, I13, I14, I15 or I16 injector
connector.
(b) Disconnect the I18 ignition switch connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
Injector (I9-1) - IG2 (I18-6)Below 1 W
Injector (I10-1) - IG2 (I18-6)Below 1 W
Injector (I11-1) - IG2 (I18-6)Below 1 W
Injector (I12-1) - IG2 (I18-6)Below 1 W
Injector (I13-1) - IG2 (I18-6)Below 1 W
Injector (I14-1) - IG2 (I18-6)Below 1 W
Injector (I15-1) - IG2 (I18-6)Below 1 W
Injector (I16-1) - IG2 (I18-6)Below 1 W
Injector (I9-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I10-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I11-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I12-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I13-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I14-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I15-1) or IG2 (I18-6) -
Body ground10 kW or higher
Injector (I16-1) or IG2 (I18-6) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1231 of 3115
DI-182
- DIAGNOSTICSENGINE
375 Author: Date:
2004 LAND CRUISER (RM1071U)
11 Check injector injection of misfiring cylinder (See page SF-24).
NG Replace injector.
OK
12 Check compression pressure of misfiring cylinder (See page EM-3).
NG Repair or replace.
OK
13 Check valve clearance of misfiring cylinder (See page EM-4).
NG Adjust valve clearance.
OK
14 Check result of step 4 switch step by number of misfire cylinder.
High misfire rate cylinderProceed to
1 or 2 cylindersA
More than 3 cylindersB
B Check for intermittent problems
(See page DI-3).
A
Page 1232 of 3115
- DIAGNOSTICSENGINE
DI-183
376 Author: Date:
2004 LAND CRUISER (RM1071U)
15 Check valve timing (Check for looseness or a jumped tooth of timing belt)
(See page EM-22).
NG Adjust valve timing (Repair or replace timing
belt).
OK
16 Check fuel pressure (See page SF-7).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF-1).
OK