Page 1321 of 3115

A19522A19630
VC
E2(+)
(-) E5
ECM Connector
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
DI-272
- DIAGNOSTICSENGINE
465 Author: Date:
2004 LAND CRUISER (RM1071U)
1 Check voltage between terminals VC and E2 of ECM connector.
CHECK:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals of the E5 ECM connec-
tor.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
2 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors.
(1) Disconnect the vacuum hose from the vapor pres-
sure sensor.
(2) Using the MITYVAC (Hand-Held Vacuum Pump),
apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)
to the vapor pressure sensor.
(3) Check the vapor pressure sensor output waveform
using a hand-held tester.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
(1) Voltage: 2.9 to 3.7 V
(2) Voltage: 0.5 V or less
(3) A consecutive waveform presents.
OK Check for intermittent problems
(See page DI-3).
NG
Page 1322 of 3115
A21031
V1
Wire Harness Side:
Vapor Pressure SensorPTNK GND
VCC
A21032ECM Connector E5
E9
VC
E2
PTNK
- DIAGNOSTICSENGINE
DI-273
466 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open and short in harness and connector between vapor pressure sen-
sor
and ECM.
PREPARATION:
(a) Disconnect the V1 vapor pressure sensor connector.
(b) Disconnect the E5 and E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
PTNK (V1-2) - PTNK (E9-21)Below 1 W
GND (V1-1) - E2 (E5-28)Below 1 W
VCC (V1-3) - VC (E5-18)Below 1 W
PTNK (V1-2) or PTNK (E9-21) -
Body ground10 kW or higher
VCC (V1-3) or VC (E5-18) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
Page 1323 of 3115

P22487
Vehicle Speed
SensorCombination
MeterECM 4-pulse 4-pulse DI-274
- DIAGNOSTICSENGINE
467 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0500 Vehicle Speed Sensor ºAº
DTC P0503 Vehicle Speed Sensor ºAº Intermittent/
Erratic/High
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0500Step 1
No vehicle speed sensor sig-
nal to ECM under following
conditions (a) and (b): (1 trip
detection logic)
(a) Park/neutral position
switch is OFF
(b) Vehicle is being driven
Combination meter
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
ECM
P0503DI-3Intermittent problem in the ve-
hicle speed sensor circuit
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 9 km/h (6 mph) or more.
If there is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that
there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DI3CQ-13
Page 1324 of 3115
A21364
17 Cowl Side J/B LHECM
Combination Meter
SPD E8
2E 28
2Q70
16
C15J14
J/C
B B SB SB V
15
C15SB
From Vehicle Speed Sensor
- DIAGNOSTICSENGINE
DI-275
468 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
Related DTCsP0500Vehicle speed sensor ºAº pulse input error
Main sensorsVehicle speed sensor
Required sensors/componentsRelated sensorsPark/Neutral position switch, Engine coolant tem-
perature sensor, Combination meter
Frequency of operationContinuous
Duration500 output X 4 times
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)
Vehicle speed is 9 km/h (6 mph) or more4 sec.-
Park/neutral position switchOFF
Transfer neutral switchNot ºNº position
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor signalNo pulse input
WIRING DIAGRAM
Page 1325 of 3115
DI-276
- DIAGNOSTICSENGINE
469 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
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 deter-
mine 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 operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed is operating normally if the speedometer display is normal.
NG Check speedometer circuit. See combination
meter troubleshooting (See page BE-2).
OK
Page 1326 of 3115
A19521A19629
SPD(+) E7
E8
ECM Connector E1
AT7809
4 to 6 V
Turn the Wheel
- DIAGNOSTICSENGINE
DI-277
470 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminal SPD and E1 of ECM connector.
PREPARATION:
(a) Shift the shift lever to neutral.
(b) Jack up the rear wheel on one side.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminal of the E7
and E8 ECM connector when the wheel is turned slowly.
OK:
Tester ConnectionSpecified Condition
SPD (E8-17) - E1 (E7-1)Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
NG Check and repair harness and connector be-
tween combination meter and ECM.
OK
Replace ECM (See page SF-60).
Page 1327 of 3115
DI-278
- DIAGNOSTICSENGINE
471 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0504 Brake Switch ºAº/ºBº Correlation
CIRCUIT DESCRIPTION
In addition to turning on the stop lamps, the stop lamp switch signals are used for a variety of engine, trans-
mission, and suspension functions as well as being an input for diagnostic checks. It is important that the
switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and
ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.
HINT:
Normal condition is as shown in the table.
SignalBrake pedal releasedIn transitionBrake pedal depressed
STPOFFONON
ST1-ONONOFF
DTC No.DTC Detection ConditionTrouble Area
P0504
Conditions (a), (b) and (c) continue for 0.5 sec. or more:
(a) Ignition switch ON
(b) Brake pedal released
(c) STP signal is OFF when the ST1- signal is OFFShort in stop lamp switch signal circuit
Stop lamp fuse
Stop lamp switch
ECM
DIC2K-01
Page 1328 of 3115
A21771
S5 Stop Light SWECM
ST1-
STP J/B No. 4
Cowl Side J/B RH
IGN J4
J/C I18
Ignition SW
Cowl Side J/B LH
STOP
Engine Room J/B
FL BlockH11
High Mounted Stop Light
R10
Rear Combination Light LH
R13
Rear Combination Light RHStop
Stop
MAINAM2
J/B No. 2ALT
BatteryBK BJBM 1
32
413
4E
4E 159
4C
4D9E812
E819 8
3E
3E4
4
3M3M5 A A
6 7
35
35
31 4126
2D 2E
2E
2D2K
10
2A
1
2C
1
1C9
1B
2
F15
1
F1682
BP3BH2
2
1
5BH2
BP3
6 53
78
BD2 BL4
35 G-W
G-R
R-G
B-R
B-R B-R
W-R
G-W
W-R
G-RW-R G-W
G-W G-W G-W
W-B G-W G-WB-R R-G
B-G
B-G
W-R
G-W
G-W G-W
G-W
G-WW-B
W-B
W-B
W-B W-BW-BW-B AM2 IG2
*1: w/o Navigation System
*2: w/ Navigation System
(*1)
BH2 3(*2)
- DIAGNOSTICSENGINE
DI-279
472 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM