Page 1000 of 3115
D02290
Line Pressure
Control Pressure
Current Flow to Solenoid
BE4056
ON
OFF
1 cycle
Duty Ratio =
A + B
A
x 100 (%)
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-479
672 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2716 Pressure Control Solenoid ºDº Electrical
(Shift Solenoid Valve SLT)
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator
valve (which modulates line pressure) causes the solenoid
valve SLT, under electronic control, to precisely and minutely
modulate and generate line pressure according to the accelera-
tor pedal effort, or the detected engine power output.
This controls the line pressure and provides smooth shifting
characteristics.
Upon receiving the throttle valve opening angle signal, ECM
controls the line pressure by sending a predetermined (*) duty
ratio to the solenoid valve, modulating the line pressure, and
generating throttle pressure.
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B
is the period of non-continuity, then
DTC No.DTC Detection ConditionTrouble Area
P2716ECM detects solenoid SLT circuit open or short malfunction for
1 sec. or more (1-trip detection logic)Open or short in shift solenoid valve SLT circuit
Shift solenoid valve SLT
ECM
MONITOR DESCRIPTION
When an open or short in the linear solenoid valve (SLT) circuit is detected, the ECM interprets this as a fault.
The ECM will turn ON the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP2716Shift solenoid valve SLT/Range check
Required sensors/ComponentsShift solenoid valve SLT
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
DIB3K-02
Page 1001 of 3115
D12762
ECM
SLT+ SLT- G-B
G-W
E6
G12
EB2E6
13 6
14 E1
Electronically Controlled
Transmission Solenoid
G-B
G-W
EB23 6
SLT+ SLT-
GR DI-480
- DIAGNOSTICSAUTOMATIC TRANSMISSION
673 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not present.See page DI-361
Solenoid current cut statusNot cut
Battery voltage11 V or more-
CPU command duty ratio to SLT19% or more-
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Solenoid status from ICFail (Open or short)
COMPONENT OPERATING RANGE
ParameterStandard value
Output signal dutyLess than 100%
WIRING DIAGRAM
Page 1002 of 3115
1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994SLT+
SLT-
D11583SLT+SLT-
E5E6E7E8E9
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-481
674 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check transmission wire.
PREPARATION:
Disconnect the transmission wire connector.
CHECK:
Measure resistance between SLT+ and SLT- of transmission
wire.
OK:
Resistance: 5.0 to 5.6 W at 20°C (68°F)
CHECK:
Measure resistance between terminals SLT+ and SLT- 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 SLT+ and SLT- of ECM connector.
PREPARATION:
(a) Connect the transmission wire connector.
(b) Disconnect the connector of the ECM.
CHECK:
Measure resistance between terminals SLT+ and SLT- of ECM
connector.
OK:
Resistance: 5.0 to 5.6 W at 20°C (68°F)
CHECK:
Measure resistance between terminals SLT+ and SLT- 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).
Page 1003 of 3115
D11987
2 1
DI-482
- DIAGNOSTICSAUTOMATIC TRANSMISSION
675 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check shift solenoid valve SLT.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the oil pan.
(c) Remove the shift solenoid valve SLT.
CHECK:
(a) Measure the resistance between terminals 1 and 2 of so-
lenoid connector.
Standard: 5.0 to 5.6 W at 20°C (68°F)
(b) Connect the positive (+) lead with an 21 W bulb to terminal
2 of solenoid connector and negative (-) lead to terminal
1 of the solenoid valve connector, then check the move-
ment of the valve.
Standard: Solenoid sounds operation noise.
OK:
Standard
NG Replace the shift solenoid valve SLT
(See page AT-8).
OK
Repair or replace the transmission wire
(See page AT-6).
Page 1004 of 3115
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-483
676 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2740 Transmission Fluid Temperature Sensor ºBº
Circuit
DTC P2742 Transmission Fluid Temperature Sensor ºBº
Circuit Low Input
DTC P2743 Transmission Fluid Temperature Sensor ºBº
Circuit High Input
CIRCUIT DESCRIPTION
The ATF temperature sensor converts fluid temperature into a resistance value which is input in to the ECM.
ATF temperature sensor No.2 is on the transmission and just before the oil cooler inlet pipeline.
If ECM detects the abnormally high temperature of ATF by this sensor, it draws driver's attention by illuminat-
ing the warning lamp.
HINT:
The temperature of ATF easily raises when towing, climbing hills and in traffic, etc.
If the ATF temperature sensor No.2 shorts, the signal that indicates the ATF temperature is 150C
(302F) or higher is input in ECM.
Vehicle conditions when sensor is in normal and when the vehicle is in short are indicated in the table
below.
ATF temperature No.2 Sensor
StateDetection ConditionSymptomRecovery Condition
Sensor is normal
AT fluid temp. more than 150C
(302F).AT Oil Temp. warning light re-
mains onAT fluid temp. less than 135C
(275F). *1
Sensor is normalAT fluid temp. more than 130C
(266F).Shift point too high.AT fluid temp. less than 110C
(230F).
Sensor is in shortAny conditions.
AT Oil Temp. warning light re-
mains on
Shift point too high.
Symptoms still occur
HINT:
*1: When AT fluid temperature is in normal range, it decreases to less than 135C within 5 minutes with the
shift lever in P or N position in a idling state.
DTC No.DTC Detecting ConditionTrouble Area
P2740
(a) and (b) is detected momentary within 0.5 sec. when neither
P2742 or P2743 is not detected (1-trip detection logic)
(a) ATF temperature sensor resistance is less than 79 W.
(b) ATF temperature sensor resistance is more than 156 kW.
HINT:
Wthin 0.5 sec. the malfunction switches from (a) to (b) or from
(b) to (a)
Open or short in ATF temperature sensor No. 2 circuit
ATF temperature sensor No. 2
P2742ATF temperature sensor resistance is less than 79 W. for 0.5
sec. or more (1-trip detection logic)ECM
P2743
DTC is detected for 0.5 sec. or more (1-trip detection logic)
ATF temperature sensor resistance is more than 156 kW. after
started engine for 15 minutes or more
DIC33-01
Page 1005 of 3115
DI-484
- DIAGNOSTICSAUTOMATIC TRANSMISSION
677 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resis-
tance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an
opens or shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than
79 W or more than 156 kW, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn
on the MIL and store the DTC.
MONITOR STRATEGY
P2740ATF temperature sensor/Range check (Fluttering)
Related DTCsP2742ATF temperature sensor/Range check (Low resistance)Related DTCs
P2743ATF temperature sensor/Range check (High resistance)
Required sensors/ComponentsATF temperature sensor
Frequency of operationContinuous
Duration0.5 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
Range check (Fluttering, Low resistance)
The typical enabling condition is not avail-
able.-
Range check (High resistance)
Time after engine start15 min. or more-
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Range check (Fluttering)
ATF temperature sensor resistance
Less than 25 W
or
More than 156 kW
Range check (Low resistance)
ATF temperature sensor resistanceLess than 25 W
Range check (High resistance)
ATF temperature sensor resistanceMore than 156 kW
COMPONENT OPERATING RANGE
ParameterStandard value
ATF temperature sensorAtmospheric temperature to approx. 130°C (266°F)
Page 1006 of 3115
D12759
Electronically Controlled
Transmission Solenoid
THO1
Y
1 2
E2ECM
4
28 E1
G-Y
11
10
9THO2
E5 E6E6
L
BR-W Y OO
G-Y
L
BR-W
If1 EB2EB2
OT+
OT2+ OT-
OT2-
EB3 BR-W BR-W BR-W
32432
1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994OT2+ OT2-
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-485
678 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check transmission wire.
PREPARATION:
Disconnect the transmission wire connector from the transmis-
sion.
CHECK:
Measure the resistance between terminals OT2+ and OT2-.
OK:
79 W to 156 kW
CHECK:
Measure resistance between terminals OT2+ and OT2- of the
transmission wire connector and body ground.
OK:
Resistance: 1 MW or higher
NG Replace the transmission wire (ATF tempera-
ture sensor).
OK
Page 1007 of 3115
D12792E2THO2
E5E6E7E8E9
DI-486
- DIAGNOSTICSAUTOMATIC TRANSMISSION
679 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Measure resistance between terminal THO2 and E2 of ECM connector.
PREPARATION:
(a) Connect the transmission wire connector.
(b) Disconnect the connector of the ECM.
CHECK:
Measure the resistance between terminals THO2 and E2.
OK:
79 W to 156 kW
CHECK:
Measure resistance between terminals THO2 and E2 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).
