Page 1306 of 3115
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
- DIAGNOSTICSENGINE
DI-257
450 Author: Date:
20 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment door (See page
SF-60).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors at following condition (1) and (2).
(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.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 22.
NG
21 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
22 Check fuel tank inlet valve.
NG Replace fuel tank inlet valve.
OK
Page 1311 of 3115
A19522A19630
VC
E2(+)
(-) E5
ECM Connector
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
DI-262
- DIAGNOSTICSENGINE
455 Author: Date:
11 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
12 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 at following condition (1) and (2).
(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.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 14.
NG
Page 1312 of 3115
A19638
PRG
Air Air
FF EE
VSV is ON VSV is OFF
E5
- DIAGNOSTICSENGINE
DI-263
456 Author: Date:
13 Check for open and short in harness and connector between vapor pressure sen-
sor
and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
14 Check EVAP VSV.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the VSV function.
(1) Connect between terminal EVP1 of the ECM con-
nector and body ground (ON).
(2) Disconnect between terminal EVP1 of the ECM
connector and body ground (OFF).
OK:
(1) VSV is ON:
Air from port E flows out through port F.
(2) VSV is OFF:
Air does not flow from port E to port F.
OK Go to step 17.
NG
Page 1313 of 3115
A19639VSV is OFF VSV is ON CCV
Air
E Air
E
FF
E5
DI-264
- DIAGNOSTICSENGINE
457 Author: Date:
15 Check operation of EVAP VSV (See page SF-44).
NG Replace EVAP VSV.
OK
16 Check for open and short in harness and connector between EFI or ECD relay
and EVAP VSV, and EVAP VSV and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
17 Check CCV.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the VSV function.
(1) Connect between terminal CCV of the ECM con-
nector and body ground (ON).
(2) Disconnect between terminal CCV of the ECM con-
nector and body ground (OFF).
OK:
(1) VSV is ON:
Air does not flow from port E to port F.
(2) VSV is OFF:
Air from port E flows out through port F.
OK Go to step 20.
NG
Page 1315 of 3115
A19641VSV is ON VSV is OFFTBP
Air
E Air
E
FF
E9
DI-266
- DIAGNOSTICSENGINE
459 Author: Date:
20 Check pressure switching valve.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the VSV function.
(1) Connect between terminal TBP of the ECM connec-
tor and body ground (ON).
(2) Disconnect between terminal TBP of the ECM con-
nector and body ground (OFF).
OK:
(1) VSV is ON:
Air from port E flows out through port F.
(2) VSV is OFF:
Air does not flow from port E to port F.
OK Go to step 23.
NG
21 Check operation of pressure switching valve (See page SF-46).
NG Replace pressure switching valve.
OK
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 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
