Page 1095 of 3115
A21366
Engine
Room
R/B11ECM
W
E9 11
C13
C12
SB10
Battery7
4I18
Ignition
Switch
73E
3Q 6
B-R
MET
Combination
Meter
Malfunction
Indicator
Lamp AM2IG2 AM2
W
B-RSB
2Q 2D32 78
Cowl Side
J/B RHA
AJ4
J/B W-R
2E 41
10
2A
W-R
1B 9
1C 1
F15 2
Fusible Link
Block B-G
120A MAIN
- DIAGNOSTICSENGINE
DI-355
548 Author: Date:
2004 LAND CRUISER (RM1071U)
MIL Circuit
CIRCUIT DESCRIPTION
If the ECM detects a trouble, the MIL lights up. At this time, the ECM records a DTC in the memory.
WIRING DIAGRAM
DIC2V-01
Page 1103 of 3115
A21367
ECM
MREL
E2
HT2A
OX2A
OX1A HT1A
HT2B
OX2B
OX1B HT1B 8
28
33
22
234
25
21
295 E9
E5
E6
E6
E6E6
E6
E6
E6 E6 J/B No. 5
2 15
5C
5D B-W
1
1 1
1
12
3 4 Engine Room R/B
EFI or ECD Relay
W-B
B-Y
B-Y
B-Y
1
IX2SB
Cowl Side J/B LH
EFI or ECD No. 245
5
2A2Q
Engine Room J/B
43 44
11
1
1C 1A 1B
1BEFI or ECD No. 1
F15
FL Block
291 2
3
43
8119 5
11 2
3
41
43
1
3 2
43B-W
EB3
EB3
EB3 EB3 EB3
EB3
EB1BR
BR
BRBR B-G
EA ECD C C C C C J17
J/C
MAIN
BatteryW-B+B
E1HT
OX HT
OX +B
E1H7 Heated Oxygen Sensor
(Bank 2 Sensor 1)
H5 Heated Oxygen Sensor
(Bank 1 Sensor 1)If1
B W
W
BY
W
B LL (*1)
(*1)
(*1)
(*1) (*1)
(*1)BR-W BR-W
B-Y
B-Y
B-Y
W-B
B-YR-B R-B
+B
E1HT
OXHT
OX +B
E1
BR-WH6 Heated Oxygen Sensor
(Bank 1 Sensor 2)
D
*1: Shielded H8 Heated Oxygen Sensor
(Bank 2 Sensor 2)R B-Y
2
BR-W
BR-W BR-W
BR-W BR-W BR-W
B-Y
B-Y
B-Y DI-54
- DIAGNOSTICSENGINE
247 Author: Date:
WIRING DIAGRAM
Page 1108 of 3115
A21361
ECM
MRELVG
E2G
8 E530
E5 29 M1
Mass Air Flow Meter
Battery EFI or ECD No. 2
B-YCowl Side J/B LH
10 5
2A
2BB-YVG
E2G +B
34 5
G-W G-W G-WL-Y
L-Y L-Y
IW3
IW3IN2
IN2
E9 B-W B-WJ/B No. 5
15 2
5D 5C
W-B
Engine Room R/B
EFI or ECD Relay
1
1 1
1
1 2
34Engine Room J/B
4443
1B 1A
1B 1CW-B W-B
B-Y W-B
B-Y
F15
FL Block
MAIN2B-G
EA 1 11EFI or ECD No. 168
2 5
- DIAGNOSTICSENGINE
DI-59
252 Author: Date:
2004 LAND CRUISER (RM1071U)
COMPONENT OPERATING RANGE
ParameterStandard Value
Mass air flow meter voltage0.4 to 2.2 V
WIRING DIAGRAM
Page 1119 of 3115
A19962
8
1 M1
Mass Air Flow Meter
Y-B
E528 E5 20
THA
E2
E1 R5V ECM
3 10
7
BR-W THA
E2IN2
If1 IN2 IW3
7 2
BR-W BR BRY-B Y-B
IW3 DI-70
- DIAGNOSTICSENGINE
263 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs related to different systems that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
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, and other data from the time the malfunction occurred.
Page 1126 of 3115
A19963
2
1G-B
BR-W
E528 E5 19
THW
E2
E1 R 5V ECM
BR E 2
Engine Coolant Temp. Sensor
3
If1
- DIAGNOSTICSENGINE
DI-77
270 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs related to different system that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
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, and other data from the time the malfunction occurred.
Page 1138 of 3115
A21362
T16
Throttle Control
Motor and Sensor
4
6
1
228
18
31
21
2
3
17 E5ECM
E2
VC
VTA2
VTA1 3
5
(Shielded)L-R
M-
M+
GE01 E5
E5
E5
E7
E7
E7 BR-W 3
BR-W
L-RIf1
If14
Y-B
R-Y
W
R E2
VC
VTA2
VTA
M-
M+
- DIAGNOSTICSENGINE
DI-89
282 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs related to different system that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
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.
Page 1157 of 3115
DI-108
- DIAGNOSTICSENGINE
301 Author: Date:
2004 LAND CRUISER (RM1071U)
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)
There is history that the following condi-
tions A and B were met:20 sec. (Continuously)-
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Time after engine start120 sec.-
IdleON
Fuel system statusClosed loop
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0130, P0150:
Either of the following conditions A or B is met:3 times or more
A. Front oxygen sensor voltage is 0.55 V or lessFor 18 sec. or more
B. Front oxygen sensor voltage is 0.4 V or moreFor 18 sec. or more
P2195, P2197:
Front heated oxygen sensor voltageConstant 0.55 V or less
P2196, P2198:
Front heated oxygen sensor voltageConstant 0.4 V or more
COMPONENT OPERATING RANGE
ParameterStandard value
In the normal condition, the heated oxygen sensor voltage0 to 1 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Front HO2S voltage monitor
If the HO2S voltage is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$07Minimum front HO2S voltageN/AV
$08Maximum front HO2S voltageN/AV
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
Page 1170 of 3115
- DIAGNOSTICSENGINE
DI-121
314 Author: Date:
2004 LAND CRUISER (RM1071U)
Front HO2S frequency monitor (cruse)
If the $90 is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$90
Remained value of that average of
switching frequency is subtracted
from average of switching frequen-
cy threshold
Multiply by 0.04096 plus 5.2sec.
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
The narrowing down the trouble area is possible by performing ACTIVE TEST of the following ºA/F CON-
TROLº (Heated oxygen sensor or another can be distinguished).
(a) Perform ACTIVE TEST by hand-held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately 90 seconds.
(4) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
RESULT:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25 % " rich output: More than 0.5 V
-12.5 % " lean output: Less than 0.4 V
NOTICE:
However, there is a few second delay in the sensor 1 (front sensor) output. And there is about 20 se-
conds delay in the sensor 2 (rear sensor).
