1998 TOYOTA LAND CRUISER coolant temperature

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-477
670 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
[The following items are common to all conditions below: OFF malfunction (A) and (B)]
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
Transmission Fluid Temperature Sensor
ºAº 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 left.
Pressure control solenoid ºAº (SL1) circuit
There is no malfunction in the circuits shown on the left.
Pressure control solenoid ºBº (SL2) circuit
Pressure control solenoid ºDº (SLT) 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
ATF temperature10°C or more-
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
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Summation of C1 clutch heat generations
= R (Turbine speed - Output speed x Temporary ratio)Specified value

DI-488
- DIAGNOSTICSAUTOMATIC TRANSMISSION
681 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The following items are common to all conditions below: OFF malfunction and ON malfunction
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) circuitThere is no malfunction in the circuits shown on the leftShift solenoid ºEº (SR) circuitThere is no malfunction in the circuits shown on the left.
Torque converter clutch pressure control
solenoid circuit
KCS sensor circuit
ETCS (Electric throttle control system)Not system down
Transmission shift positionºDº
ECT (Engine coolant temperature)40°C (104°F) or more-
Spark advance from Max. retard timing by
KCS control0° CA or more-
EngineRunning
ECM selected gear4th or 5th
Vehicle speed25 km/h or more-
Shift solenoid ºAº (S1) circuit
Shift solenoid ºBº (S2) circuitTh i lf ti i th i it h th l ftPressure control solenoid ºBº (SL2) circuitThere is no malfunction in the circuits shown on the left.
1-2 Shift valve
Transfer neutral position switchOFF
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 sensor 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
OFF malfunction
ECM lock-up commandON
(SLU pressure: 513kpa or more)
Vehicle speed-Less than 100 km/h (62 mph)
ON malfunction
ECM lock-up commandOFF
(SLU pressure: less than 4kpa)
Throttle valve opening angle9% or more-
Vehicle speed-Less than 60 km/h (38 mph)

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-373
566 Author
: Date
:
9. PROBLEM SYMPTOM CONFIRMATION
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms. If the
problem is that the transmission does not shift up, shift down, or the shift point is too high or too low, conduct
the following road test referring to the automatic shift schedule and simulate the problem symptoms.
10. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 to 80°C (122 to 176°F).
(a) D position test (NORM and PWR pattern):
Shift into the D position and fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up-shifts take place, and that the shift points conform
to the automatic shift schedule (See page SS-23).
HINT:

5th Gear Up-shift Prohibition Control (1. Coolant temp. is 55°C (131°F) or less. 2. Vehicle speed is
51 km/h (32 mph) or less.)

4th Gear Up-shift Prohibition Control (1. Coolant temp. is 40°C (104°F) or less. 2. Vehicle speed is
45 km/h (28 mph) or less.)

5th Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60°C (140°F)
or less.)

When the 2nd start switch is on, there is no 1"2 up-shift and 2"1 down-shift.
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up-shifts.
(3) Check for abnormal noises and vibration.
Drive in the D position lock-up or 5th gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick-down operation.
While running in the D position, 2nd, 3rd, 4th and 5th gears, check that the possible kick-down
vehicle speed limits for 2 " 1, 3 " 2, 4 " 3 and 5th " 4 kick-downs conform to those indicated
on the automatic shift schedule (See page SS-23).
(5) Check abnormal shock and slip at kick-down.
(6) Check the lock-up mechanism.

Drive in D position 5th gear, at a steady speed (lock-up ON) of about 70 km/h (43 mph).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
If there is a big jump in engine speed, there is no lock-up.
(b) 4 position test:
Shift into the 4 position and fully depress the accelerator pedal and check the following points.
(1) Check up-shift operation.
Check that the 1 " 2, 2 " 3 and 3 " 4 up-shift takes place and that the shift point conforms
to the automatic shift schedule (See page SS-23).
HINT:

There is no 5th up-shift in the 4 position.

4th Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60°C (140°F)
or less.)

DI3BT-04
DI-396
- DIAGNOSTICSAUTOMATIC TRANSMISSION
589 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check
the electrical circuits for each symptom in the order given in the charts on the following pages and proceed
to the page given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On-vehicle Repair Matrix Chart
Chapter 3: Off-vehicle Repair Matrix Chart
If the instruction ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check
and replace the ECM.
Chapter 1: Electronic Circuit Matrix Chart
HINT:
*1: When a malfunction is on the circuit *1 mark is attached, DTC is output.
SymptomSuspect AreaSee page
No up-shift
(A particular gear, from 1st to 4th gear, is not up-shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI-460
DI-464
IN-36
No up-shift (4th " 5th)
1. Transmission control switch circuit (D - 4) *1
2. Engine coolant temp. sensor circuit *1
3. Speed sensor NT circuit *1
4. Shift solenoid valve (SL1) circuit *1
5. Shift solenoid valve (SL2) circuit *1
6. Shift solenoid valve (SR) circuit *1
7. ECM
DI-402
DI-36
DI-418
DI-426
DI-449
DI-468
IN-36
No up-shift (3rd " 4th)
1. Engine coolant temp. sensor circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI-36
DI-464
IN-36
No up-shift (1st " 2nd)
1. Transmission control switch circuit (2 - L) *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI-402
DI-464
IN-36
No down-shift (5th " 4th)
1. Transmission control switch circuit (D - 4) *1
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SL2) circuit *1
4. Shift solenoid valve (SR) circuit *1
5. ECM
DI-402
DI-426
DI-449
DI-468
IN-36
No down-shift (2nd " 1st)
1. Transmission control switch circuit (2 - L) *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI-402
DI-464
IN-36
No down-shift
(A particular gear, from 1st to 4th gear, is not down-shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI-460
DI-464
IN-36
No lock-up
1. ATF temperature sensor circuit *1
2. Transfer L4 position switch circuit *1
3. Stop light switch circuit *1
4. Speed sensor NT circuit *1
5. Shift solenoid valve (SLU) circuit *1
6. ECM
DI-410
DI-472
DI-424
DI-418
DI-491
IN-36
No lock-up offECMIN-36

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-397
590 Author
: Date
:
2004 LAND CRUISER (RM1071U) Shift point too high or too low
1. Shift solenoid valve (SLT) circuit *1
2. Speed sensor NT circuit *1
3. Speed sensor SP2 circuit *1
4. Throttle position sensor circuit *1
5. ATF temperature sensor circuit *1
6. Pattern select switch circuit (PWR mode switch)
7. Transfer L4 position switch circuit *1
8. ECM
DI-479
DI-418
DI-421
DI-36
DI-410
DI-495
DI-472
IN-36
Up-shift to 5th from 4th while shift lever is 4 position1. Transmission control switch circuit (D - 4) *1
2. ECM
DI-402
IN-36
Up-shift to 5th from 4th while engine is cold1. Engine coolant temp. sensor circuit *1
2. ECM
DI-36
IN-36
Up-shift to 4th from 3rd while shift lever is 3 position1. Park/neutral position switch circuit *1
2. ECM
DI-402
IN-36
Up-shift to 3rd from 2nd while shift lever is 2 position1. Park/neutral position switch circuit *1
2. ECM
DI-402
IN-36
Up-shift to 2nd from 1st while shift lever is L position1. Transmission control switch circuit (2 - L) *1
2. ECM
DI-402
IN-36
Harsh engagement (N " D)
1. Speed sensor NT circuit *1
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SLT) circuit *1
4. ECM
DI-418
DI-426
DI-479
IN-36
Harsh engagement (Lock-up)
1. Speed sensor NT circuit *1
2. Speed sensor SP2 circuit *1
3. Shift solenoid valve (SLU) circuit *1
4. ECM
DI-418
DI-421
DI-491
IN-36
Harsh engagement (Any driving position)ECMIN-36
Poor acceleration1. ATF temperature sensor No.2 circuit *1
2. ECM
DI-483
IN-36
No engine brakingECMIN-36
No kick-downECMIN-36
Engine stalls when starting off or stoppingECMIN-36
No pattern select (PWR)1. Pattern select switch circuit (PWR mode switch)
2. ECMDI-495
IN-36
No 2nd start
1. Pattern select switch circuit (2nd start switch)
2. Transmission control switch circuit (2 - L) *1
3. ECM
DI-497
DI-402
IN-36
AT Oil Temp. warning light remains on*1Lock-up at 3rd gear1. ATF temperature sensor No.2 circuit *1
2 ECM
DI-483
IN 36Shift point too high2. ECMIN-36
A/T.P. indicator light does not light up
1. A/T.P. indicator light circuit
2. Combination meter circuit
3. ECMDI-500
BE-58
IN-36

- DIAGNOSTICSENGINE
DI-65
258 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0101 Mass or Volume Air Flow Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100, P0102 and P0103 on page DI-57.
DTC No.DTC Detecting ConditionTrouble Area
P0101
After engine is warmed up, conditions (a), (b), (c) and (d) con-
tinue for more than 10 seconds:
(2 trip detection logic)
(a) Throttle valve fully closed
(b) Voltage output of the mass air flow meter is more than 2.2
V.
(c) Engine coolant temperature is more than 70 °C (158 °F).
(d) Engine speed is less than 900 rpm.

Mass air flow meter
Conditions (a), (b) and (c) continue for more than 6 seconds
with engine speed: (2 trip detection logic)
(a) Engine speed is more than 0 rpm.
(b) VTA is more than 0.1 V.
(c) Voltage output of the mass air flow meter is less than 0.25
V.
MONITOR DESCRIPTION
The MAF (Mass Air Flow) meter helps the ECM calculate the amount of air flowing through the throttle valve.
The ECM uses this information to determine the fuel injection time and provide a proper air fuel ratio. Inside
the MAF meter, there is a heated platinum wire exposed to the flow of intake air. By applying a specific current
to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an
internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the volt-
age applied to these components in the MAF meter. The voltage level is proportional to the air flow through
the MAF meter. The ECM interprets this voltage as the intake air amount. If there is a defect in the MAF meter
or an open or short circuit, the voltage level will deviate outside the normal operating range. The ECM inter-
prets this deviation as a defect in the MAF meter and sets a DTC.
Example:
If the voltage is more than 2.2 V at idle or less than 0.25 V at idle OFF, the ECM interprets this as a defect
in the MAF meter and sets a DTC.
MONITOR STRATEGY
Related DTCsP0101Mass air flow meter rationality
Main sensors/componentsMass air flow meter
Required sensors/componentsRelated sensors/componentsEngine speed sensor, Engine coolant tempera-
ture sensor, Throttle position sensor
Frequency of operationContinuous
Duration10 sec. (High voltage)
6 sec. (Low voltage)
MIL operation2 driving cycles
Sequence of operationNone
DI1LC-17

DI-66
- DIAGNOSTICSENGINE
259 Author
: Date
:
2004 LAND CRUISER (RM1071U)
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)
High voltage:
Engine speed-900 rpm
IdleON
Engine coolant temperature70C (158F)-
Low voltage:
Engine speed0 rpm-
Throttle position0.1 V-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Mass air flow meter voltage (High voltage)More than 2.2 V
Mass air flow meter voltage (Low voltage)Less than 0.25 V

- DIAGNOSTICSENGINE
DI-75
268 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0115 Engine Coolant Temperature Circuit
DTC P0117 Engine Coolant Temperature Circuit Low
Input
DTC P0118 Engine Coolant Temperature Circuit High
Input
CIRCUIT DESCRIPTION
A thermistor is built in the Engine Coolant Temperature (ECT) sensor and changes the resistance value ac-
cording to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same the Intake Air Temperature (IAT) sensor.
HINT:
If the ECM detects the DTC ºP0115, P0117 or P0118º, it operates the fail-safe function in which the ECT
is assumed to be 80 C (176 F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115Step 1
Open or short in engine cool-
ant temperature sensor circuit
for 0.5 sec.
P0117Step 4
Short in engine coolant tem-
perature sensor circuit for 0.5
sec.
Open or short in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM
P0118Step 2
Open in engine coolant tem-
perature sensor circuit for 0.5
sec.
HINT:
After confirming DTC ºP0115, P0117 or P0118,º use the OBD II scan tool or the hand-held tester to confirm
the engine coolant temperature from the DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL.
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
140°C (284°F) or moreShort circuit
MONITOR DESCRIPTION
The ECT (Engine Coolant Temperature) sensor is used to monitor the engine coolant temperature. The ECT
sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When
the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the
resistance drops. The variations in resistance are reflected in the voltage output from the sensor.
The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature.
When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault
in the ECT sensor and sets a DTC.
Example:
When the ECM calculates that the ECT is less than -40C (-40F), or more than 140C (284F), and if either
the condition continues for 0.5 sec. or more, the ECM will set a DTC.
DI1LF-13