TOYOTA LAND CRUISER 1998 Factory Repair Manual

DI-202
- DIAGNOSTICSENGINE
395 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0351 Igniter Coil ºAº Primary/Secondary Circuit
DTC P0352 Igniter Coil ºBº Primary/Secondary Circuit
DTC P0353 Igniter Coil ºCº Primary/Secondary Circuit
DTC P0354 Igniter Coil ºDº Primary/Secondary Circuit
DTC P0355 Igniter Coil ºEº Primary/Secondary Circuit
DTC P0356 Igniter Coil ºFº Primary/Secondary Circuit
DTC P0357 Igniter Coil ºGº Primary/Secondary Circuit
DTC P0358 Igniter Coil ºHº Primary/Secondary Circuit
HINT:

These DTCs indicate a malfunction related to primary circuit.

If DTC P0351 is displayed, check No. 1 ignition coil with igniter circuit.

If DTC P0352 is displayed, check No. 2 ignition coil with igniter circuit.

If DTC P0353 is displayed, check No. 3 ignition coil with igniter circuit.

If DTC P0354 is displayed, check No. 4 ignition coil with igniter circuit.

If DTC P0355 is displayed, check No. 5 ignition coil with igniter circuit.

If DTC P0356 is displayed, check No. 6 ignition coil with igniter circuit.

If DTC P0357 is displayed, check No. 7 ignition coil with igniter circuit.

If DTC P0358 is displayed, check No. 8 ignition coil with igniter circuit.
DIC2F-01

A21429
ECM
No.1 Ignition Coil with Igniter
No. 2 Ignition
Coil with Igniter Crankshaft
Position
Sensor
Camshaft
Position
Sensor
Other Sensors:
No. 3 Ignition
Coil with Igniter
No. 4 Ignition
Coil with Igniter
No. 5 Ignition
Coil with Igniter
No. 6 Ignition
Coil with Igniter
No. 7 Ignition
Coil with Igniter
No. 8 Ignition
Coil with Igniter
TA C
To TachometerFrom Battery
Igniter
Ignition CoilSpark Plug
No. 1 Cylinder
No. 4 Cylinder
No. 5 Cylinder
No. 6 Cylinder No. 2 Cylinder
No. 3 Cylinder
No. 7 Cylinder
No. 8 Cylinder IGT1
IGF1
IGT2
IGF2
IGT3
IGT4
IGT5
IGT6
IGT7
IGT8 (Engine Coolant Temp.
Sensor, Mass Air Flow
Sensor, Throttle Position
Sensor, etc.)
- DIAGNOSTICSENGINE
DI-203
396 Author
: Date
:
2004 LAND CRUISER (RM1071U)
CIRCUIT DESCRIPTION
These DTCs indicate a malfunction related to primary circuit.
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 passes from the
center electrode to the ground electrode.
The ECM determines the ignition timing and outputs the ignition signals (IGTs) for each cylinder. Using the
IGT, the ECM turns on and off the power transistor inside the igniter and this switches on and off the current
to the primary coil. When current to the primary coil is cut off, high-voltage is generated in the secondary
coil and this voltage is applied to the spark plugs to create sparks inside the cylinders. As the ECM cuts the
current to the primary coil, the igniter sends back the ignition confirmation signal (IGF) for each cylinder igni-
tion to the ECM.

A03401
IGT Signal Saveform
IGT
GND
IGF
20 msec./Division GND
A20793
Normal Ignition signal
(IGT)
Ignition
confirmation
signal (IGF)Malfunction
Circuit Open ECM
IGFIGT
IgniterIgnition Coil
Time Ignition Coil with Igniter DI-204
- DIAGNOSTICSENGINE
397 Author
: Date
:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detecting ConditionTrouble Area
P0351
P0352
P0353
P0354
P0355
P0356
P0357
P0358
No IGF signal to ECM while engine is running

Open or short in IGF1 or IGF2 and IGT1 to IGT8 circuit from
ignition coil with igniter to ECM

No. 1 to No. 8 ignition coil with igniter

Ignition system

ECM
Reference: Inspection using the oscilloscope.
During cranking or idling, check the waveform between termi-
nals IG1 to IG8 and E1, and IGF1, IGF2 and E1 of the E5 and
E7 ECM connectors.
MONITOR DESCRIPTION
If the ECM does not receive the IGF after sending the IGT it interprets this as a fault in the igniter and sets
a DTC.

- DIAGNOSTICSENGINE
DI-205
398 Author
: Date
:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
P0351No. 1 ignition coil with igniter circuit malfunction
P0352No. 2 ignition coil with igniter circuit malfunction
P0353No. 3 ignition coil with igniter circuit malfunction
RltdDTCP0354No. 4 ignition coil with igniter circuit malfunctionRelated DTCsP0355No. 5 ignition coil with igniter circuit malfunction
P0356No. 6 ignition coil with igniter circuit malfunction
P0357No. 7 ignition coil with igniter circuit malfunction
P0358No. 8 ignition coil with igniter circuit malfunction
Required sensors/componentsIgniter
Frequency of operationContinuous
Duration0.256 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Engine speed-1,500 rpm
Either of the following conditions is met:A or B
A. Following conditions are met:(a) and (b)
(a) Engine speed-500 rpm
(b) Battery voltage6 V-
B. Following conditions are met:(a) and (b)
(a) Engine speed500 rpm-
(b) Battery voltage10 V-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
ºIgnition signal fail countºMore than 2
ºIgnition signal fail countº is as follows:When IGF should have returned despite sending IGT.
COMPONENT OPERATING RANGE
Standard Value
Confirmed signal number = ignition signal number

A21368
I8 Ignition Coil with Igniter No. 8
I7 Ignition Coil with Igniter No. 7
I2 Ignition Coil with Igniter No. 2 I3 Ignition Coil with Igniter No. 3 I4 Ignition Coil with Igniter No. 4 I5 Ignition Coil with Igniter No. 5 I6 Ignition Coil with Igniter No. 6
I1 Ignition Coil with Igniter No. 1ECM
IGF1 IGF2
IGT8
IGT7
IGT6
IGT5
IGT4
IGT3
IGT2
IGT1 24
26 10
25
8
9 13
12
11 E5
E5
E5
E5
E5
E5
E5
E5
E5
E523
B-R
B-W
L-B
B-L
B-Y
EC
BatteryEngine Room J/BI18
Ignition SW
IG2 AM2 Y
G
L
R
B B-R
A
A If1
If17
6
B-R B-R B-R
B-R
B-R B-R
B-R
B-R 3
1 4
2
3
1 4
2
3
1 4
2
3
1 4
2
3
1 4
2
3
1 4
2
3
1 4
2
3
1 4
2 B-R
B-W
W-B
B-R
W-B
B-W
W-B
B-W
W-B
B-R
W-B
B-W
W-B
B-R
W-B
B-R
W-B
B-W W-B
W-B
W-B
W-B
W-B B-W
B-W
B-W B-R
B-R
W-B
EDF15
FL Block
MAIN
2 B-G N1 Noise Filter
(Ignition )
21B-R W-B B-R B-R B-R B-RJ4
J/C
IN2
Ib2
6
7
Cowl Side J/B LH
10
41 9 1AM2
W-R W-R
2E 2A 1B
1C11
8B-R
B-R
B-R
B-R
B-R
B-R DI-206
- DIAGNOSTICSENGINE
399 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

- DIAGNOSTICSENGINE
DI-207
400 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:

If DTCs P0351, P0354, P0356 and P0357 are output simultaneously, IGF1 circuit may be open or
short.

If DTCs P0352, P0353, P0355 and P0358 are output simultaneously, IGF2 circuit may be open or
short.

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can
help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, as well as other data from the time when a malfunction occurred.
1 Check spark plug and spark (See page IG-1).
NG Go to step 4.
OK

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

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.

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

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