1998 TOYOTA LAND CRUISER sensor

DI-290
- DIAGNOSTICSENGINE
483 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0560 System Voltage
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM store data such as DTC history, freeze frame data, fuel trim values, and other data.
If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power
supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No.DTC Detecting ConditionTrouble Area
P0560Open in back up power source circuit

Open in back-up power source circuit

EFI or ECD No.1 fuse

ECM
HINT:
If DTC P0560 present, the ECM will not store another DTC.
MONITOR STRATEGY
Related DTCsP0560System voltage malfunction
Required sensors/componentsECM
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (*1)
Sequence of operationNone
*1: The DTC is set immediate. The MIL will be illuminated after the next engine start.
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)
Stand-by RAMInitialized
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Battery voltageLess than 3.5 V
DIC2M-01

DI-294
- DIAGNOSTICSENGINE
487 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0604 Internal Control Module Random Access
Memory (RAM) Error
DTC P0606 ECM/PCM Processor
DTC P0607 Control Module Performance
DTC P0657 Actuator Supply Voltage Circuit / Open
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
RAM (Random Access Memory) errors. The two CPUs also perform continuous mutual monitoring.
The ECM sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the sig-
nals to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator sup-
ply voltage, and 4) any other ECM malfunction is found.
DTC No.DTC Detecting ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM malfunction
ECM
MONITOR STRATEGY
P0604Random access memory (RAM) error range
check
Related DTCsP0606ECM range check/description
P0657Actuator supply voltage circuit range check
Required sensors/componentsECM
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
The typical enabling condition is not avail-
able-
DI1MF-1 1

DI-296
- DIAGNOSTICSENGINE
489 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0617 Starter Relay Circuit High
MONITOR DESCRIPTION
While the engine is being cranked, the battery positive voltage is applied to terminal STA of the ECM.
If the vehicle is being driven and the ECM detects the starter control signal (STA), the ECM concludes that
the starter control circuit is malfunctioning. The ECM will turn on the MIL and a DTC is set.
DTC No.DTC Detection ConditionTrouble Area
P0617
When all conditions (a), (b) and (c) are satisfied for 20 seconds
with battery (+B) voltage 10.5 V or more
(a) Vehicle speed
20 km/h (12.4 mph)
(b) Engine revolution
1,000 rpm
(c) STA signal ON
Park/neutral position switch

Starter relay circuit

Ignition switch

ECM
MONITOR STRATEGY
Related DTCsP0617Starter signal error
Rid / tMain sensors/componentsStarter signalRequired sensors/componentsRelated sensors/componentsVehicle speed sensor, Engine speed sensor
Frequency of operationContinuous
Duration20 sec.
MIL operationImmediate
Sequence of operationNone
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)
Battery voltage10.5 V-
Vehicle speed20 km/h (12.4 mph)-
Engine speed1,000 rpm-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Starter signalON (at ºmore than 20 km/h (12.4 mph) and more than 1,000 rpmº)
DIC2N-01

DI-302
- DIAGNOSTICSENGINE
495 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P2102 Throttle Actuator Control Motor Circuit Low
DTC P2103 Throttle Actuator Control Motor Circuit High
CIRCUIT DESCRIPTION
The throttle motor is operated by the ECM and it opens and closes the throttle valve.
The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the
throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to
control the throttle motor and monitor the throttle opening angle as the ECM responds to driver inputs.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2102
Conditions (a) and (b) continue for 2.0 seconds:
(a) Throttle control motor output duty 80 % or more
(b) Throttle control motor current 0.5 A or less
Open in throttle control motor and sensor circuit

Throttle control motor and sensor

ECM
P2103
Either of following conditions is met.
(a) Throttle control motor current 10 A or more (0.1 sec)
(b) Throttle control motor current 7 A or more (0.6 sec.)

Short in throttle control motor and sensor circuit

Throttle control motor and sensor

Throttle valve

Throttle body

ECM
MONITOR DESCRIPTION
The ECM monitors the current through the electronic throttle motor and detects malfunctions or open circuit
in the throttle motor based on the voltage of the current. When the current deviates from the standard, the
ECM concludes that there is a fault in the throttle motor.
Or, if the throttle valve is not functioning properly (for example, stuck ON) the ECM concludes that there is
a fault and turns on the MIL and a DTC is set.
Example:
When the current is more than 10 A. Or the current is less than 0.5 A when the motor driving duty ratio is
exceeding 80%. The ECM concludes that the current is out of range, turns on the MIL and a DTC is set.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by
the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop
and the system will return to normal condition.
DIC2O-01

- DIAGNOSTICSENGINE
DI-303
496 Author
: Date
:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
RltdDTC
P2102Throttle actuator control motor current
(Low current)
Related DTCs
P2103Throttle actuator control motor current
(High current)
Required sensors/componentsThrottle actuator motor
Frequency of operationContinuous
Duration2 sec.
MIL operationP2102: Immediate
P2103: 1 driving cycle
Sequence of operationNone
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)
P2102:
Throttle motorON
Duty-cycle ratio to open throttle actuator80%-
Throttle actuator power supply8 V-
Current motor current - Motor current at
0.016 sec. before-0.2 A
P2103:
Throttle motorON
Either of the following conditions is met:A or B
A. Throttle actuator power supply8 V-
B. Throttle actuator powerON
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P2102:
Throttle motor currentLess than 0.5 A (when motor drive duty 80% or more)
P2103:
Throttle motor currentMore than 10 A (0.1 sec.)
More than 7 A (0.6 sec.)
WIRING DIAGRAM
Refer to DTC P0120 on page DI-84.

A21034
T16
Component Side:
M+M- Throttle Control Motor and Sensor
DI-304
- DIAGNOSTICSENGINE
497 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Check throttle control motor.
PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:
Tester ConnectionSpecified Condition
M+ (T16-2) - M- (T16-1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF-36).
OK

A21022
T16
M+ M-
Wire Harness Side:
Throttle Control Motor and Sensor
A21028
E7
M+M-
ECM Connector
- DIAGNOSTICSENGINE
DI-305
498 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector between throttle control mo-
tor and ECM.
PREPARATION:
(a) Disconnect the T16 throttle control motor and sensor con-
nector.
(b) Disconnect the E7 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
M+ (T16-2) - M+ (E7-3)Below 1 W
M- (T16-1) - M- (E7-2)Below 1 W
M+ (T16-2) or M+ (E7-3) -
Body ground10 kW or higher
M- (T16-1) or M- (E7-2) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
3 Visually check throttle valve.
CHECK:
Check between the throttle valve and the housing for foreign objects.
Also, check if the valve can open and close smoothly.
NG Remove foreign object and clean throttle body.
OK
Replace ECM (See page SF-60).

DI-306
- DIAGNOSTICSENGINE
499 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P2111 Throttle Actuator Control System
-Stuck Open
DTC P2112 Throttle Actuator Control System
-Stuck Closed
CIRCUIT DESCRIPTION
The throttle motor is operated by the ECM and it opens and closes the throttle valve using gears. The open-
ing angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body.
The throttle position sensor provides feedback to the ECM to control the throttle motor and set the throttle
valve angle in response to driver input.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2111Throttle motor locked during ECM order to close.
Throttle control motor and sensor circuit

Throttle control motor and sensor
P2112Throttle motor locked during ECM order to open.
Throttle control motor and sensor

Throttle body

Throttle valve
MONITOR DESCRIPTION
The ECM concludes that there is a malfunction of the ETCS (Electronic Throttle Control System) when the
throttle valve remains at a fixed angle despite high drive current from the ECM. The ECM will turn on the MIL
and a DTC is set.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by
the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop
and the system will return to normal condition.
DIC2P-01