1998 TOYOTA LAND CRUISER sensor
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- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-453
646 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0781 1-2 Shift
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor and direct clutch speed sensor to detect the actual
gear position (1st, 2nd, 3rd, 4th or 5th gear). Then the ECM compares the actual gear with the shift schedule
in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic
transmission (clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P0781The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)Valve body is blocked up or stuck (1-2 shift)
Automatic transmission assembly
ECM
MONITOR DESCRIPTION
The ECM calculates the ºactualº transmission gear by comparing the signals from the input speed sensor
and the output speed sensor. The ECM can detect many mechanical problems in the shift solenoids, valve
body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear position and
the commanded gear position are different, it will illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP0781Valve body/Rationality check
MainValve body
Required sensors/ComponentsSubAutomatic transmission assembly, Speed sensor (NT), Speed sensor
(NO), Vehicle speed sensor, Throttle speed sensor
Frequency of operationContinuous
Condition (A) and (B)0.4 sec.
DurationCondition (C)3 sec.Duration
Condition (D)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
DIB3D-02
Page 975 of 3115
DI-454
- DIAGNOSTICSAUTOMATIC TRANSMISSION
647 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The Following items are common to all conditions below: Condition (A), (B), (C) and (D)
The monitor will run whenever the follow-
ing DTCs are not present.See page DI-361
Turbine speed sensor (NT) circuit
Output speed sensor (NO) circuit
Shift solenoid ºAº (S1) circuit
Shift solenoid ºBº (S2) circuit
Shift solenoid ºEº (SR) circuitThere is no malfunction in the circuits shown on the leftPressure control solenoid ºAº (SL1) circuitThere is no malfunction in the circuits shown on the left.
Pressure control solenoid ºBº (SL2) circuit
ECT (Engine coolant temperature) sensor
circuit
KCS sensor circuit
ETCS (Electric throttle control system)Not system down
Transmission shift positionºDº
ECT40°C (104°F) or more-
Spark advance from Max. retard timing by
KCS control0° CA or more-
EngineRunning
Transfer rangeºHIGHº*1
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor ºAº circuitTh i lf ti i th i it h th l ft Output shaft speed sensor circuitThere is no malfunction in the circuits shown on the left.
Transfer output speed143 rpm or more-
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 or moreLess than 1.1
Condition (A)
ECM selected gear2nd
Vehicle speed2 km/h (1 mph) or more-
Output speed2nd " 1st down shift point or more-
Throttle valve opening angle6.5% or more at 2,000 rpm
(conditions vary with engine speed)-
Condition (B)
ECM selected gear4th
Vehicle speed2 km/h (1 mph) or more-
Throttle valve opening angle6.5% or more at 2,000 rpm
(conditions vary with engine speed)-
Condition (C)
Current ECM selected gear5th
Last ECM selected gear4th
Vehicle speed
(During transition from 4th to 5th gear)-Less than 100 km/h (62 mph)
Condition (D)
Page 978 of 3115
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-457
650 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0818 Driveline Disconnect Switch Input Circuit
CIRCUIT DESCRIPTION
The ECM detects the signal from the transfer neutral position switch.
This DTC indicates that the transfer neutral position switch remains ON.
DTC No.DTC Detecting ConditionTrouble Area
P0818
Transfer neutral position switch remains ON while vehicle run-
ning under conditions for 30 sec. (2-trip detection logic)
Vehicle speed is 25 km/h or more
Transfer shift position is HShort in transfer neutral position switch circuit
Transfer neutral position switch
ECM
MONITOR DESCRIPTION
The ECM detects whether or not the transfer gear is in the neutral position by monitoring the signal from the
transfer neutral position switch.
If the ECM detects that the transfer-case is in neutral under the following conditions, the ECM will conclude
that there is a malfunction of the transfer-case neutral position switch:
Transfer-case neutral position switch indicates that the transfer-case is in neutral.
Transfer-case shifter is in the ºHº position.
The vehicle is traveling at 25 km/h (16 mph) or more.
The neutral switch has been ON for more than thirty seconds.
If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the transfer-
case neutral position switch, illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP0818Transfer neutral position switch/Verify switch cycling
Rid /C tMainTransfer neutral position switchRequired sensors/ComponentsSubVehicle speed sensor
Frequency of operationContinuous
Duration30 sec.
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
Vehicle speed25 km/h (16 mph) or more-
Transfer positionHigh
Ignition switch ON and time after OFF to
ON0.5 sec. or more-
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Transfer neutral switch signalON
DIB3E-02
Page 981 of 3115
DI-460
- DIAGNOSTICSAUTOMATIC TRANSMISSION
653 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0973 Shift Solenoid ºAº Control Circuit Low
(Shift Solenoid Valve S1)
DTC P0974 Shift Solenoid ºAº Control Circuit High
(Shift Solenoid Valve S1)
CIRCUIT DESCRIPTION
See page DI-426.
DTC No.DTC Detection ConditionTrouble Area
P0973ECM detects short in solenoid valve S1 circuit 4 times when
solenoid valve S1 is operated (1-trip detection logic)Short in shift solenoid valve S1 circuit
Shift solenoid valve S1
ECM
P0974ECM detects open in solenoid valve S1 circuit 4 times when
solenoid valve S1 is not operated (1-trip detection logic)Open in shift solenoid valve S1 circuit
Shift solenoid valve S1
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 stored
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
RltdDTCP0973Shift solenoid valve S1/Range check (Low resistance)Related DTCsP0974Shift solenoid valve S1/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S1
Frequency of operationContinuous
Duration0.1 sec. x 2 (times) or more
MIL operation1 driving cycle
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 (Low resistance)
SolenoidON
Range check (High resistance)
SolenoidOFF
DIB3F-02
Page 985 of 3115
DI-464
- DIAGNOSTICSAUTOMATIC TRANSMISSION
657 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0976 Shift Solenoid ºBº Control Circuit Low
(Shift Solenoid Valve S2)
DTC P0977 Shift Solenoid ºBº Control Circuit High
(Shift Solenoid Valve S2)
CIRCUIT DESCRIPTION
See page DI-426.
DTC No.DTC Detection ConditionTrouble Area
P0976ECM detects short in solenoid valve S2 circuit 4 times when
solenoid valve S2 is operated (1-trip detection logic)Short in shift solenoid valve S2 circuit
Shift solenoid valve S2
ECM
P0977ECM detects open in solenoid valve S2 circuit 4 times when
solenoid valve S2 is not operated (1-trip detection logic)Open in shift solenoid valve S2 circuit
Shift solenoid valve S2
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 stored
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
RltdDTCP0976Shift solenoid valve S2/Range check (Low resistance)Related DTCsP0977Shift solenoid valve S2/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve S2
Frequency of operationContinuous
Duration0.1 sec. x 2 (times) or more
MIL operation1 driving cycle
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 (Low resistance)
SolenoidON
Range check (High resistance)
SolenoidOFF
DIB3G-02
Page 989 of 3115
DI-468
- DIAGNOSTICSAUTOMATIC TRANSMISSION
661 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0985 Shift Solenoid ºEº Control Circuit Low
(Shift Solenoid Valve SR)
DTC P0986 Shift Solenoid ºEº Control Circuit High
(Shift Solenoid Valve SR)
CIRCUIT DESCRIPTION
see page DI-426.
DTC No.DTC Detection ConditionTrouble Area
P0985ECM detects short in solenoid valve SR circuit 4 times when
solenoid valve SR is operated (1-trip detection logic)Short in shift solenoid valve SR circuit
Shift solenoid valve SR
ECM
P0986ECM detects open in solenoid valve SR circuit 4 times when
solenoid valve SR is not operated (1-trip detection logic)Open in shift solenoid valve SR circuit
Shift solenoid valve SR
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.) (see page
DI-426).
MONITOR STRATEGY
RltdDTCP0985Shift solenoid valve SR/Range check (Low resistance)Related DTCsP0986Shift solenoid valve SR/Range check (High resistance)
Required sensors/ComponentsShift solenoid valve SR
Frequency of operationContinuous
Duration0.1 sec. x 2 (times) or more
MIL operation1 driving cycle
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 (Low resistance)
SolenoidON
Range check (High resistance)
SolenoidOFF
DIB3H-02
Page 993 of 3115
DI-472
- DIAGNOSTICSAUTOMATIC TRANSMISSION
665 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P1782 T/F L4 Range Position Switch Performance
CIRCUIT DESCRIPTION
The ECM detects the signal from the transfer L4 position switch.
This DTC indicates that the transfer L4 position switch remains ON.
DTC No.DTC Detecting ConditionTrouble Area
P1782
Transfer L4 position switch remains ON while vehicle running
under conditions for 18 seconds or more (1-trip detection log-
ic)
(a) Output shaft speed 3000 rpm or less
(b) Transfer shift position is H
Short in transfer L4 position switch circuit
Transfer L4 position switch
ECM
MONITOR DESCRIPTION
The ECM monitors the transfer-case L4 position switch to determine when the transfer-case L4 gear is en-
gaged. If the transfer-case L4 gears remain engaged under the following conditions, the ECM will conclude
that there is a malfunction of the L4 position switch:
L4 switch indicated that the L4 transfer-case gears are engaged.
Transfer-case shifter is in the ºHº position.
Transfer-case output shaft rpm is between 750 and 3,000 rpm.
The specified time period has elapsed.
If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the L4 switch,
illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP1782Transfer L4 position switch/ON malfunction
Required sensors/ComponentsTransfer L4 position switch
Frequency of operationContinuous
DtiON malfunction (A)1.8 sec.DurationON malfunction (B)0.5 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The following items are common to all conditions below: ON malfunction (A) and (B)
The monitor will run whenever the follow-
ing DTCs are not present.See page DI-361
Output speed sensor circuitTh i lf ti i th i it h th l ftVehicle speed sensor ºAº circuitThere is no malfunction in the circuits shown on the left.
Transfer neutral position switchOFF
ON malfunction (A)
Output speed (Transfer output speed)1,000 rpm or moreLess than 3,000 rpm
ON malfunction (B)
Output speed (Transfer output speed)143 rpm or more-
DICEA-01
Page 997 of 3115
D01769
DI-476
- DIAGNOSTICSAUTOMATIC TRANSMISSION
669 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2714 Pressure Control Solenoid ºDº Performance
(Shift Solenoid Valve SLT)
SYSTEM DESCRIPTION
The ECM calculates the shifting condition by using the signals
from the vehicle speed sensor, throttle position sensor, etc..
And compares this result with the signal that ECM sends to SLT
to detect mechanical trouble of the shift solenoid valve SLT,
valve body, torque converter clutch and automatic transmission
assembly (clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P2714
ECM detects a malfunction on SLT (ON side) according to the
revolution difference of the turbine and the output shaft, and
also by the oil pressure.Shift solenoid valve SLT is stuck open or closed
Valve body blocked up or stuck
Automatic transmission assembly
MONITOR DESCRIPTION
The ECM sends (ED: delete ºtheº) signals (Duty Ratio) to the shift solenoid valve SLT based on the informa-
tion such as the signal from throttle position sensor and the vehicle speed sensor.
Based on the signal's duty-ratio, the shift solenoid valve SLT adjusts the hydraulic pressure to the primary
regulator valve to an appropriate level. This function enables a smooth vehicle operation by adjusting the
line hydraulic pressure to match the engine output and running condition.
The ECM calculates the ºactualº transmission gear by comparing the signals from the input speed sensor
and the output speed sensor. The ECM can detect many mechanical problems in the shift solenoids, valve
body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear position and
the commanded gear position are different, it will illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP2714Shift solenoid valve SLT/ON malfunction
MainShift solenoid valve SLT
Required sensors/ComponentsSubValve body, ATF temperature sensor, Speed sensor (NT), Speed sensor
(NO)
Frequency of operationContinuous
DurationImmediate
MIL operation2 driving cycles
Sequence of operationNone
DIB3J-02