Page 945 of 3115

DI-424
- DIAGNOSTICSAUTOMATIC TRANSMISSION
617 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0724 Brake Switch ºBº Circuit High
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock-up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signal to ECM. Then the ECM cancels operation of
the lock-up clutch while braking is in progress.
DTC No.DTC Detection ConditionTrouble Area
P0724Stop light switch always turn on even vehicle is driver Go and
Stop 10 times. (2-trip detection logic)Short in stop light switch signal circuit
Stop light switch
ECM
MONITOR DESCRIPTION
When the stop light switch remains ON during ºstop and goº driving, the ECM interprets this as a fault in the
stop light switch and the MIL comes on and the ECM stores the DTC. The vehicle must stop and go (3 km/h
(2 mph) to 30 km/h (19 mph)) ten times for two driving cycles in order to detect malfunction.
MONITOR STRATEGY
Related DTCsP0724Stop light switch/Range check/Rationality
Rid /C tMainStop light switchRequired sensors/ComponentsSubVehicle speed sensor
Frequency of operationContinuous
DurationGO and STOP 10 times
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not present.See page DI-361
The stop light switch remains on during GO and STOP 10 times.
GO and STOP are defined as follows;
GO: Vehicle speed30 km/h (19 mph) or more-
STOP: Vehicle speed-Less than 3 km/h (2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Brake switch statusON stuck
WIRING DIAGRAM
See page DI-278.
DIB37-02
Page 946 of 3115
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-425
618 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check stop light switch (See page BE-50).
NG Replace stop light switch.
OK
2 Check harness and connector between ECM and stop light switch (See page
IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-36).
Page 947 of 3115
DI-426
- DIAGNOSTICSAUTOMATIC TRANSMISSION
619 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0748 Pressure Control Solenoid ºAº Electrical
(Shift Solenoid Valve SL1)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ON and OFF of the shift solenoid valves S1, S2,
SR, SL1 and SL2, controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves,
the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail
safe function).
DIB38-02
Page 948 of 3115

NORMAL S1 OFF S2 OFF SR OFF
ºRºGear
ºDº
º3º
º2º
ºLº
S1S2Gear GearSR SL1 SL2GearS1 S2 SR SL1 SL2 S1 S2 SR SL1 SL2 S1 S2 SR SL1 SL2
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
""
"
"
"
"
"
"
"
"
RRR R
1 st
1 st
1 st1 st 1 st
1 st 1 st
1 st 1 st 1 st
1 st E/B 1 st E/B 1 st E/B 1 st E/B
2 nd E/B
3 rd E/B
4 th
5 th
3 rd E/B 3 rd E/B2 nd E/B
2 nd
4 th 4 th
5 th 5 th
"
2 nd E/B"
4 th 4 th4 th 4 th 4 th 4 th 3 rd 3 rd3 rd
3 rd 4 th
"
5 th 5 th5 th 4 th
"
3 rd E/B
"
3 rd E/B
3 rd E/B 3 rd E/B
5 th 5 th
2 nd E/B
3 rd E/B
5 th 5 th4 th
3 rd E/B 3 rd E/B
4 th
1 st E/B
"
2 nd
" "
5 th1 st E/B"
2 nd Fail 4th
"
3 rd E/B
3 rd E/B
4 th
5 th3 rd
""
2 nd
2 nd
2 nd
2 nd 2 nd 2 nd 2 nd 2 nd
2 nd
3 rd E/B 3 rd E/B
"
"
"
"
3 rd
3 rd
3 rd 1 st
1 st
1 st1 st 3 rd
4 th
4 th
4 th
4 th
Fail 4 th
"
3 rd 4 th
"
Position
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-427
620 Author: Date:
2004 LAND CRUISER (RM1071U)
Fail Safe Function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
: ON X: OFF
Page 949 of 3115

S2 SR OFF S1 SR OFF S1 S2 SR OFF
Gear Gear Gear
ºRº
ºDº
º3º
º2º
ºLº
"
RRR R
1 st
1 st E/B
4 th
5 th3 rd
2 nd
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
""
"
"
"
"
""
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
1 st
1 st 1 st 1 st 1 st
1 st 1 st 1 st 1 st2 nd
2 nd
2 nd 3 rd
3 rd
3 rd
3 rd 3 rd
3 rd
3 rd
3 rd
1 st E/B
1 st E/B
1 st E/B
1 st E/B
1 st E/B 1 st E/B 1 st E/B
1 st E/B
1 st E/B
1 st E/B 1 st E/B 1 st E/B1 st E/B 1 st E/B
1 st E/B
1 st E/B
1 st E/B
4 th
4 th
4 th
4 th
4 th 4 th
4 th
5 th 4 th4 th
4 th 4 th 4 th
4 th
4 th
3 rd E/B
3 rd E/B3 rd
1 st 1 st 1 st
1 st
1 st1 st
2nd1 st
2nd 2nd 1 st E/B2nd1 st 3 rd E/B
3 rd
3 rd 3 rd E/B
3 rd1 st
3 rd
3 rd E/B
3 rd
1 st
1 st
1 st
1 st
1 st
1 st 1 st
4 th
3 rd
3 rd E/B
3 rd
3 rd E/B
3 rd E/B
4 th
5 th
4 th
5 th
Fail 4 th
Fail 4 th
Fail 4 th
Fail 4 th
""" "
" " " " " " """"
"""" " " "
" " " "
S1 S2 SR SL1 SL2 S1 S2 SR SL1 S1 S2 SR SL1 S1 S2 SR SL1 SL2
3 rd SL2 SL2GearS1 S2 OFF
"
"
"
"
"
"
"
"
3 rd 4 th
"
Position
DI-428
- DIAGNOSTICSAUTOMATIC TRANSMISSION
621 Author: Date:
2004 LAND CRUISER (RM1071U)
: ON X: OFF
Page 950 of 3115

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-429
622 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detection ConditionTrouble Area
P0748
ECM checks for an open or short circuit in shift solenoid valves
SL1 (1-trip detection logic)
(a) When solenoid, duty ratio equal to 100%
(b) When solenoid is not energized, duty ratio is less than 3%Open or short in shift solenoid valve SL1 circuit
Shift solenoid valve SL1
ECM
MONITOR DESCRIPTION
The ECM commands gearshift by turning the shift solenoid valves ºON/OFFº. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores
the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good condi-
tion ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.).
MONITOR STRATEGY
Related DTCsP0748Shift solenoid valve SL1/Range check
Required sensors/ComponentsShift solenoid valve SL1
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not present.See page DI-361
Battery voltage10 V or more-
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Output signal duty100%
COMPONENT OPERATING RANGE
ParameterStandard value
Output signal dutyLess than 100%
Page 951 of 3115
D12762
SL1+
SL1- R-L
R-WE6
18
412ECM E1
Electronically Controlled
Transmission Solenoid
19
E6
EB3EB36
10 R-L
R-W
L R
SL1+
SL1- DI-430
- DIAGNOSTICSAUTOMATIC TRANSMISSION
623 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 952 of 3115

1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994
SL1-
SL1+
D11583SL1+SL1-
E5E6E7E8E9
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-431
624 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check transmission wire.
PREPARATION:
Disconnect the trasmission wire connector.
CHECK:
Measure resistance between SL1+ and SL1- of transmission
wire.
OK:
Resistance: 5.0 to 5.6 W at 20°C (68°F)
CHECK:
Measure resistance between terminals SL1+ and SL1- of the
transmission wire connector and body ground.
OK:
Resistance: 1 MW or higher
NG Go to step 3.
OK
2 Measure resistance between terminal SL1+ and SL1- of ECM connector.
PREPARATION:
(a) Connect the transmission wire connector.
(b) Disconnect the connector of the ECM.
CHECK:
Measure resistance between terminals SL1+ and SL1- of ECM
connector.
OK:
Resistance: 5.0 to 5.6 W at 20°C (68°F)
CHECK:
Measure resistance between terminals SL1+ and SL1- of the
ECM connector and body ground.
OK:
Resistance: 1 MW or higher
NG Repair or replace the harness or connector
(See page IN-36).
OK
Check and replace the ECM (See page
IN-36).