Page 1217 of 3115
A20646
20V
/Division Injector Signal Waveform
20V
/Division
GND
100 msec./Division (Idling)(Magnification)
GND
1 msec./Division (Idling)
Injection duration
DI-168
- DIAGNOSTICSENGINE
361 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detecting ConditionTrouble Area
P0300Misfiring of random cylinders is detected
Open or short in engine wire
Connector connection
Vacuum hose connection
P0301
P0302
P0303
P0304
P0305
P0306
P0307
P0308
Misfiring of each cylinder is detected
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
HINT:
When several codes for a misfiring cylinder are recorded repeatedly but no random misfire code is recorded,
it indicates that the misfires have been detected and recorded at different times.
Reference: Inspection using the oscilloscope.
With the engine idling, check the waveform between terminals #1 to #8 and E01 of the ECM connectors.
HINT:
The correct waveform is as shown.
Page 1220 of 3115
A19966
Battery I18
Ignition SW
#8#6 #4 #2
#7 #5ECM
#3 #1
7
5 2 1
4
3 3
1C1 F15
FL BlockEngine Room J/B
1B 6Cowl Side J/B LH
6
E7
E7 E6E5
Y
W G R
IG2
AM2E5 E5 E5 E5
5 I9
Injector No. 1
I16
Injector No. 8 I15
Injector No. 7 I14
Injector No. 6 I13
Injector No. 5 I12
Injector No. 4 I11
Injector No. 3 I10
Injector No. 2
AAJ4
J/C
Ib2 IN2712
AM22E 41
2A 10
9
2B-G
MAIN
B-W R-LL B 12
12 12 12
12 12 12 12
W-R W-R W-R B-R B-R B-R B-RB-R
B-R B-RB-R B-R B-R B-R B-R
B-RB-RB-R B-R B-R
- DIAGNOSTICSENGINE
DI-171
364 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Emission related misfire rate:
1. During the first 1,000 revolutions after engine start
(MIL is set when misfire is detected 1 time)
2. After the first 1,000 revolutions have occurred
(MIL is set when misfire is detected 4 times)
3 %/1,000 revolutions
Catalyst damage misfire count:
1. Low engine rpm area (ex. less than 3,000 rpm):
200 revolutions (MIL is set when misfire is detected 3
times)
2. High engine rpm area: Every 200 revolutions
96 count/200 revolutions
(Threshold varies with engine speed and intake air amount per revolution)
WIRING DIAGRAM
Refer to DTC P0351 on page DI-202 for the wiring diagram of the ignition system.
Page 1221 of 3115
DI-172
- DIAGNOSTICSENGINE
365 Author: Date:
2004 LAND CRUISER (RM1071U)
CONFIRMATION DRIVING PATTERN
(a) Connect the hand-held tester to the DLC3.
(b) Record DTC and the freeze frame data.
(c) Use the hand-held tester to set to the check mode (See page DI-3).
(d) Read the value on the misfire counter for each cylinder when idling. If the value is displayed on the
misfire counter, skip the following procedure of confirmation driving.
(e) Drive the vehicle several times with the engine speed, load and its surrounding range shown with EN-
GINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the DATA LIST.
If you have no hand-held tester, turn the ignition switch OFF after the symptom is simulated once. Then re-
peat the simulation process again.
HINT:
In order to memorize the DTC of misfire, it is necessary to drive around MISFIRE RPM, MISFIRE LOAD in
the DATA LIST for the following period of time. Take care not to turn the ignition switch OFF. Turning the
ignition switch OFF switches the diagnosis system from check mode to normal mode. So all DTCs, etc., are
erased.
Engine SpeedTime
Idling3 minutes 30 seconds or more
1,000 rpm3 minutes or more
2,000 rpm1 minute 30 seconds or more
3,000 rpm1 minute or more
(f) Check if there is misfire and DTC and the freeze frame data. Record the DTC's, freeze frame data and
misfire counter data.
(g) Turn the ignition switch OFF and wait at least 5 seconds.
INSPECTION PROCEDURE
HINT:
If DTCs besides misfire DTCs are memorized simultaneously, troubleshoot the non-misfire DTCs first.
If the misfire does not occur when the vehicle is brought to the workshop, the misfire can be confirmed
by reproducing the condition of the freeze frame data. Also, after finishing the repair, confirm that there
is no misfire (See confirmation driving pattern).
On 6 and 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only
a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (P0301 to
P0308).
If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area,
only code P0300 may be stored.
When only a general misfire fault code like P0300 is stored:
Erase the general misfire fault code from the hand-held tester or OBD II scan tool.
Start the engine and drive the confirmation patten.
Read the value of the misfire ratio for each cylinder. Or read the DTC.
Perform repairs on the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC.
After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs.
When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data
is over the range of ±20 %, there is a possibility that the air-fuel ratio is becoming RICH (-20 % or
less) or LEAN (+20 % or more).
When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility of
misfire only during engine warm-up.
If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2)
improper fuel is being used, and 3) the ignition plug is contaminated.
Page 1222 of 3115
- DIAGNOSTICSENGINE
DI-173
366 Author: Date:
2004 LAND CRUISER (RM1071U)
Be sure to check the value on the misfire counter after the repair.
1 Are there any other codes (besides DTC P0300, P0301, P0302, P0303, P0304
P0305, P0306, P0307 or P0308) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
ºP0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or
P0308ºA
ºP0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or
P0308º and other DTCsB
HINT:
If any other codes besides ºP0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308º are
output, perform the troubleshooting for those DTC.
B Go to relevant DTC chart (See page DI-36).
A
2 Check wire harness, connector and vacuum hose in engine room.
CHECK:
(a) Check the connection conditions of the wire harness and connector.
(b) Check for the disconnection, piping and brake of the vacuum hose.
NG Repair or replace, then confirm that there is no
misfire (See confirmation driving pattern).
OK
3 Check connection of PCV piping.
NG Repair or replace PCV piping.
OK
Page 1223 of 3115
DI-174
- DIAGNOSTICSENGINE
367 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Connect hand-held tester, and read the number of misfire.
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
(c) Start the engine.
(d) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / CYL#1 to CYL#8.
CHECK:
Read the number of misfire on the hand-held tester or the OBD II scan tool.
HINT:
When a misfire is not reproduced, be sure to branch below based on the stored DTC.
RESULT:
High Misfire Rate CylinderProceed to
1 or 2 cylindersA
More than 3 cylindersB
B Go to step 15.
A
Page 1224 of 3115
A19885
1.1 mm
- DIAGNOSTICSENGINE
DI-175
368 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Remove the ignition coil assembly.
(b) Remove the spark plug.
CHECK:
(a) Check the electrode for carbon deposits.
(b) Check the spark plug type (See page IG-1).
(c) Check electrode gap.
OK:
No large carbon deposit present.
Not wet with gasoline or oil.
Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only ºthe
base / groundº electrode. Do not touch the tip. Never at-
tempt to adjust the gap on a used plug.
PREPARATION:
(a) Install the spark plug to the ignition coil assembly.
(b) Disconnect the injector connector.
(c) Ground spark plug.
CHECK:
Check if spark occurs while engine is being cracked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark occurs across electrode gap.
OK Go to step 8.
NG
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
