1998 TOYOTA LAND CRUISER low oil pressure

D01769
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-487
680 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P2757Torque Converter Clutch Pressure Control Solenoid
Performance(Shift Solenoid Valve SLU)
SYSTEM DESCRIPTION
The ECM uses the signals from the Throttle Position Sensor
and Air-flow Meter to monitor the engagement condition of the
lock-up clutch.
Then the ECM compares the engagement condition of the
lock-up clutch with the lock-up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SLU,
valve body, torque converter clutch and automatic transmission
assembly (clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P2757
Lock-up does not occur when driving in the lock-up range
(normal driving at 80 km/h [50 mph]), or lock-up remains ON
in the lock-up OFF range.
(2-trip detection logic)
Shift solenoid valve SLU is stuck open or closed

Valve body blocked up or stuck

Lock-up clutch

Automatic transmission assembly
MONITOR DESCRIPTION
The ECM controls the oil pressure to the lock-up clutch based on engine-load information from the throttle
position sensor, crankshaft position sensor, input speed sensor, and the oil pressure sensor for shift-sole-
noid SLU. The ECM commands the shift-solenoid SLU using a duty-cycle control signal. In turn, the shift
solenoid operates the lock-up control valve and causes lock-up or flexible lock-up of the torque converter
clutch.
To monitor the condition of the lock up clutch, the ECM monitors the signals from the input speed sensor,
crank position sensor, the throttle position sensor, and air flow meter. The ECM uses this information to deter-
mine when the vehicle's torque converter clutch should be locked-up. The ECM can detect many mechani-
cal problems in the shift solenoids, valve body, and the transmission clutches, brakes, and gears. If the ECM
detects that the torque converter clutch locked below the minimum lock-up speed, it will illuminate the MIL
and store the DTC.
MONITOR STRATEGY
RltdDTCP2757Shift solenoid valve SLU/OFF malfunctionRelated DTCsP2757Shift solenoid valve SLU/ON malfunction
MainShift solenoid valve SLU
Required sensors/ComponentsSubValve body, Vehicle speed sensor, Throttle position sensor, Speed sensor
(NT), Speed sensor (NO)
Frequency of operationContinuous
DtiOFF malfunction2 sec.DurationON malfunction1.8 sec.
MIL operation2 driving cycles
Sequence of operationNone
DIB3L-02

Current flow to solenoid
Lock-up
Operation
Pressure
BE4056D00160
1 cycle ON
OFFDuty Ratio
=
A + B
A
y 100 (%) (*)
- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-491
684 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P2759Torque Converter Clutch Pressure Control Solenoid
Control Circuit Electrical(Shift Solenoid Valve SLU)
CIRCUIT DESCRIPTION
The amount of current flow to the solenoid is controlled by the
(*) duty ratio of the ECM output signal. The higher the duty ratio
becomes, the higher the lock-up hydraulic pressure becomes
during the lock-up operation.
(*) 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
P2759
The following condition is detected. (1-trip detection logic)
SLU output signal's duty ON of 3.3 msec. or more with duty
ratio of least 95% lasts for 1 second.
Open or short in shift solenoid valve SLU circuit

Shift solenoid valve SLU

ECM
MONITOR DESCRIPTION
The ECM controls the oil pressure to the lock-up clutch based on engine-load information from the throttle
position sensor, crankshaft position sensor, input speed sensor, and the oil pressure sensor for shift-sole-
noid SLU. The ECM commands the shift-solenoid SLU using a duty-cycle control signal. In turn, the shift
solenoid operates the lock-up control valve and cause lock-up or flexible lock-up of the torque converter
clutch. The ECM illuminates the MIL and store the DTC when ECM detects an open or a short circuit malfunc-
tion in the shift solenoid valve SLU.
MONITOR STRATEGY
Related DTCsP2759Shift solenoid valve SLU/Range check
Required sensors/ComponentsShift solenoid valve SLU
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
DIB3M-02

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-367
560 Author
: Date
:
6. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
While another sensor is being monitored, the next sensor or component will not be monitored until the previous
monitoring has concluded.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time when enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
7. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydrocarbon adsorptive Catalyst
(HCAC) system, HC adsorptive three-way catalystHC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut
Idle air control valveIdle speed control
VSV for CCV, Canister close valve VSV for canister controlEvaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VAV, Purge VSVEvaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSVEvaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
emission control system pressure sensorFuel tank pressure sensor
Charcoal canisterEvaporative emissions canister
ORVR systemOn-boad refueling vapor recovery system
Intake manifold runner controlIntake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)Intake manifold tuning valve
Intake control VSVIntake manifold tuning solenoid valve

D12745
SST
SST
DI-378
- DIAGNOSTICSAUTOMATIC TRANSMISSION
571 Author
: Date
:
15. HYDRAULIC TEST
Measure the line pressure.
NOTICE:

Do the test at normal operation fluid temperature 70
to 80°C (158 to 176°F).

The line pressure test should always be carried out in
pairs. One technician should observe the conditions
of wheels or wheel stoppers outside the vehicle while
the other is doing the test.

Be careful to prevent SST's hose from interfering with
the exhaust pipe.

This check must be conducted after checking and ad-
justing engine.

Perform under condition that A/C is OFF.

When conducting stall test, do not continue more
than 10 seconds.
(1) Warm up the ATF.
(2) Remove the test plug on the transmission case cen-
ter right side and connect SST.
SST 09992-00095 (09992-00231, 09992-00271)
(3) Fully apply the parking brake and chock the 4
wheels.
(4) Start the engine and check idling speed.
(5) Keep your left foot pressing firmly on the brake ped-
al and shift into D position.
(6) Measure the line pressure when the engine is idling.
(7) Depress the accelerator pedal all the way down.
Quickly read the highest line pressure when engine
speed reaches stall speed.
(8) In the same manner, do the test in R position.
Specified line pressure:
ConditionD position kPa (kgf/cm2
, psi)R position kPa (kgf/cm2, psi)
Idling362 to 420 (3.7 to 4.2, 53 to 59)500 to 580 (5.1 to 5.9, 73 to 84)
Stall1,360 to 1,460 (13.8 to 14.9, 196 to 212)1,295 to 1,415 (13.2 to 14.4, 188 to 205)
Evaluation
ProblemPossible cause
If the measured value at all positions are higher
Shift solenoid valve SLT defective

Regulator valve defective
If the measured value at all positions are lower

Shift solenoid valve SLT defective

Regulator valve defective

Oil pump defective
If pressure is low in the D position only
D position circuit fluid leakage

Clutch No. 1 (C
1) defective
If pressure is low in the R position only

R position circuit fluid leakage

Clutch No. 3 (C
3) defective

Brake No. 4 (B
4) defective

DI-40
- DIAGNOSTICSENGINE
233 Author
: Date
:
2004 LAND CRUISER (RM1071U)P0230
(DI-162)
Fuel Pump Primary Circuit

Open or short in fuel pump relay circuit

Fuel pump relay

Circuit opening relay

Fuel pump

ECM
-
P0300
(DI-167)Random/Multiple Cylinder Misfire
Detected*2
P0301
(DI-167)Cylinder 1 Misfire Detected

Open or short in engine wire
*2
P0302
(DI-167)Cylinder 2 Misfire Detected

Open or short in engine wire

Connector connection

Vacuum hose connection
*2
P0303
(DI-167)Cylinder 3 Misfire Detected

Vacuum hose connection

Ignition system

Injector*2
P0304
(DI-167)Cylinder 4 Misfire Detected

Fuel pressure

Mass air flow meter

Engine coolant temperature sensor
*2
P0305
(DI-167)Cylinder 5 Misfire Detected

Engine coolant temperature sensor

Compression pressure

Valve clearance
*2
P0306
(DI-167)Cylinder 6 Misfire Detected

Valve clearance

Valve timing

PCV piping*2
P0307
(DI-167)Cylinder 7 Misfire Detected

ECM
*2
P0308
(DI-167)Cylinder 8 Misfire Detected*2
P0325
(DI-186)Knock Sensor 1 Circuit (Bank 1
or Single Sensor)
Open or short in knock sensor 1 circuit

Knock sensor 1 (looseness)

ECM

P0330
(DI-186)Knock Sensor 2 Circuit (Bank 2)

Open or short in knock sensor 2 circuit

Knock sensor 2 (looseness)

ECM

P0335
(DI-191)Crankshaft Position Sensor ºAº
Circuit

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Signal plate

ECM

P0339
(DI-191)Crankshaft Position Sensor ºAº
Circuit Intermittent

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Signal plate

ECM
-
P0340
(DI-197)Camshaft Position Sensor ºAº
Circuit (Bank 1 or Single Sensor)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P0341
(DI-197)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 or Single Sensor)

Camshaft osition sensor

LH camshaft timing pulley

Jumping teeth of timing belt

ECM

P0351
(DI-202)Ignition Coil ºAº Primary/Second-
ary Circuit

Open or short in IGF 1 and IGT 1 circuit from No. 1 ignition coil
with igniter to ECM

No. 1 ignition coil with igniter

Ignition system

ECM

P0352
(DI-202)Ignition Coil ºBº Primary/Second-
ary Circuit

Open or short in IGF 2 and IGT 2 circuit from No. 2 ignition coil
with igniter to ECM

No. 2 ignition coil with igniter

Ignition system

ECM


- DIAGNOSTICSENGINE
DI-41
234 Author
: Date
:
2004 LAND CRUISER (RM1071U)P0353
(DI-202)
Ignition Coil ºCº Primary/Second-
ary Circuit

Open or short in IGF 2 and IGT 3 circuit from No. 3 ignition
coil with igniter to ECM

No. 3 ignition coil with igniter

Ignition system

ECM

P0354
(DI-202)Ignition Coil ºDº Primary/Second-
ary Circuit

Open or short in IGF 1 and IGT 4 circuit from No. 4 ignition coil
with igniter to ECM

No. 4 ignition coil with igniter

Ignition system

ECM

P0355
(DI-202)Ignition Coil ºEº Primary/Second-
ary Circuit

Open or short in IGF 2 and IGT 5 circuit from No. 5 ignition coil
with igniter to ECM

No. 5 ignition coil with igniter

Ignition system

ECM

P0356
(DI-202)Ignition Coil ºFº Primary/Second-
ary Circuit

Open or short in IGF 1 and IGT 6 circuit from No. 6 ignition coil
with igniter to ECM

No. 6 ignition coil with igniter

Ignition system

ECM

P0357
(DI-202)Ignition Coil ºGº Primary/Second-
ary Circuit

Open or short in IGF 1 and IGT 7 circuit from No. 7 ignition coil
with igniter to ECM

No. 7 ignition coil with igniter

Ignition system

ECM

P0358
(DI-202)Ignition Coil ºHº Primary/Second-
ary Circuit

Open or short in IGF 2 and IGT 8 circuit from No. 8 ignition coil
with igniter to ECM

No. 8 ignition coil with igniter

Ignition system

ECM

P0420
(DI-215)Catalyst System Efficiency Be-
low Threshold (Bank 1)
Gas leakage on exhaust system

Heated oxygen sensor (bank 1 sensor 1, 2)

Three-way catalytic converter

P0430
(DI-215)Catalyst System Efficiency Be-
low Threshold (Bank 2)
Gas leakage on exhaust system

Heated oxygen sensor (bank 2 sensor 1, 2)

Three-way catalytic converter

P0441
(DI-222)Evaporative Emission Control
System Incorrect Purge Flow

Vacuum hose cracks, holed, blocked, damaged or discon-
nected ((1), (2), (3), (4), (5), (6), (7), (8) and (9) in Fig. 1)

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged

Open or short in vapor pressure sensor circuit

Vapor pressure sensor

Open or short in VSV circuit for EVAP

EVAP VSV

Open or short in VSV circuit for CCV

CCV

Open or short in VSV circuit for pressure switching valve

Pressure switching valve

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

ECM


DI1L5-18
A21338
Fuel Pump Resister Knock Sensor 2
Heated Oxygen Sensor
(Bank 1 Sensor 1) Heated Oxygen Sensor
(Bank 2 Sensor 1)VSV for EVAP
Combination Meter
Ignition Coil with Igniter
ECMKnock Sensor 1
Injector
Throttle Control
Motor and Sensor
Mass Air Flow Meter
Engine Coolant
Temperature Sensor
Camshaft
Position Sensor
Crankshaft
Position Sensor
VSV for CCV
Park/neutral Position Switch DLC3
Vapor Pressure Sensor VSV for
Pressure Switching Valve
Accelerator Pedal Assembly
(Accelerator Pedal Position Sensor)
Cowl Side J/B LH:

STOP Fuse

EFI or ECD No. 2 Fuse
Engine Room R/B and J/B:

Circuit Opening Relay

Fuel Pump Relay

EFI or ECD Relay

STARTER Relay

EFI or ECD No. 1 Fuse

ECTS Fuse
- DIAGNOSTICSENGINE
DI-45
238 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PARTS LOCATION

DI-18
- DIAGNOSTICSENGINE
211 Author
: Date
:
TC/TE1
[Test Details]
Connect the TC and TE1.
ON or OFFSwitch to the same state as
the connection between
terminal TC and TE1.
FC IDL PROHBT
[Test Details]
Control the idle fuel cut prohibit.
ON or OFF
-
9. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
When a sensor is being monitored, the next sensor or component will not be monitored until the sensor monitoring
is finished.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects the malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time an enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydro-carbon Adsorptive Catalyst
(HCAC) system, HC adsorptive three-way catalystHC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve, OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut