1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1345 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 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

Page 1346 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A21365
J/B No. 5
J/B No. 6ECM J17
J/C
Cowl Side J/B LH
Cowl Side J/B RH
ACC CUT Relay
J/B No. 6 Cowl Side J/B LH
ACC Relay
To
Audio
etc.
Engine Room R/B
Engine Room J/BSTARTER Relay
STARTERE6
E5
E

Page 1347 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-298
- DIAGNOSTICSENGINE
491 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 rec

Page 1348 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-299
492 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Connect hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn th

Page 1349 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19522A19630
STA(+)
E5
ECM Connector
DI-300
- DIAGNOSTICSENGINE
493 Author: Date:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check voltage between terminal STA of

Page 1350 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19522A19630
STA(+)
E5
ECM Connector
- DIAGNOSTICSENGINE
DI-301
494 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
Tu

Page 1351 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 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 DESCRI

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 lessOpen 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

Page 1352 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-303
496 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
RltdDTC
P2102Throttle actuator control motor current
(Low current)
Related DTCs
P2103Throttle actuator co

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