TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSENGINE
DI±359
553 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
RltdDTCP2111Throttle motor actuator lock (Open)Related DTCsP2112Throttle motor actuator lock (Closed)
Rid / tMain sensors/componentsThrottle actuator motorRequired sensors/componentsRelated sensors/componentsThrottle position sensor
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
P2111:
Throttle motor current2 A±
Throttle motor duty to close side80%±
P2112:
Throttle motor current2 A±
Throttle motor duty to open side80%±
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
|Current throttle position sensor voltage at this time ± throttle
position sensor voltage 0.016 sec. earlier|Less than 0.1 V when throttle motor open (or close) duty 80% or more
WIRING DIAGRAM
Refer to DTC P0120 on page DI±127.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine 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.

DI±360
± DIAGNOSTICSENGINE
554 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check any other DTC output (in addition to DTC P2111 or P2112).
PREPARATION:
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
CHECK:
(a) Read DTCs.
Result:
Display (DTC Output)Proceed To
P2111 and/or P2112A
P2111 and/or P2112 and other DTCsB
HINT:
If any DTCs other than P2111 and/or P2112 are output, troubleshoot those DTCs first.
B Go to DTC chart (See page DI±58).
A
2 Visually check throttle valve.
PREPARATION:
Remove the intake air connector.
CHECK:
Check whether or not a foreign body is caught between the throttle valve and housing. Also, check if the valve
can open and close smoothly.
OK:
The throttle valve is not contaminated by foreign objects and can move smoothly.
NG Remove foreign body and clean throttle body.
OK

A21034
T14
Component Side:
M+M± Throttle Control Motor and Sensor
A21022
T14
M+ M±
Wire Harness Side:
Throttle Control Motor and Sensor
B17412M+
M±
E8ECM Connector
± DIAGNOSTICSENGINE
DI±361
555 Author: Date:
2005 SEQUOIA (RM1146U)
3 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:
Standard:
Tester ConnectionSpecified Condition
M+ (T14±2) ± M± (T14±1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF±39).
OK
4 Check for open and short in harness and connector between ECM and throttle
control motor.
PREPARATION:
(a) Disconnect the T14 throttle control motor and sensor con-
nector.
(b) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
M+ (T14±2) ± M+ (E8±3)Below 1 W
M± (T14±1) ± M± (E8±2)Below 1 W
M+ (T14±2) or M+ (E8±3) ±
Body ground10 kW or higher
M± (T14±1) or M± (E8±2) ±
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).

A21430
From BatteryETCS Fuse
+BM
+M
±M
ME01ECM
Motor Control
Circuit Throttle Control Motor
2
1 DI±362
± DIAGNOSTICSENGINE
556 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2118 Throttle Actuator Control Motor Current
Range/Performance
CIRCUIT DESCRIPTION
The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is
monitored and when the voltage is low (less than 4V), the ECM concludes that the ETCS has a fault and
current to the throttle control motor is cut.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage
is low, the current to the motor is cut. If repairs are made and the system has returned to normal, turn the
ignition switch OFF. The ECM then allows current to flow to the motor and the motor can be restarted.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2118Open in ETCS power source circuit (+BM)

Open in ETCS power source circuit

ETCS fuse

ECM
MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the electronic throttle motor +BM. When the power
supply voltage drops below the threshold, the ECM concludes that the power supply has an open circuit.
The MIL is turned on and a DTC is set.
DICFB±02

± DIAGNOSTICSENGINE
DI±363
557 Author: Date:
2005 SEQUOIA (RM1146U)
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.
MONITOR STRATEGY
Related DTCsP2118Throttle actuator motor power supply line range
check (Low voltage)
Required sensors/componentsThrottle actuator motor
Frequency of operationContinuous
Duration0.8 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Actuator powerON
Battery voltage8 V±
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Throttle actuator motor power supply voltageLess than 4 V
COMPONENT OPERATING RANGE
ParameterStandard Value
Throttle actuator motor power supply voltage9 to 14 V

A05652A18100
ECM
+BM
E47
W±G
Battery2H3 ETCS
2D1Engine Room J/B
B
IA413
W±G
4
F10
Fusible Link
Block
5
B DI±364
± DIAGNOSTICSENGINE
558 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

A21380
Engine Room J/B
ETCS
Fuse
B17411
+BM (+) E6
E4
E1 (±)
± DIAGNOSTICSENGINE
DI±365
559 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine 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 ETCS fuse.
PREPARATION:
Remove the ETCS fuse from the engine room J/B.
CHECK:
Check the resistance of the ETCS fuse.
OK:
Below 1 W
NG Check for short in all harness and components
connected to ETCS fuse.
OK
2 Check voltage between terminal +BM and E1 of ECM connector.
CHECK:
Measure the voltage between the specified terminals of the E6
and E4 ECM connector.
OK:
Standard:
Tester ConnectionSpecified Condition
+BM (E4±7) ± E6 (E6±1)9 to 14 V
OK Check for intermittent problems
(See page DI±11).
NG

A21380
Engine Room J/B
ETCS
Fuse
B17417
E4
+BM
DI±366
± DIAGNOSTICSENGINE
560 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open or short in harness or connector between battery and ETCS fuse,
ETCS fuse and ECM.
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the E4 ECM connector.
CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and ECM.
OK:
Standard:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
terminal) ± +BM (E4±7)Below 1 W
Engine Room J/B (ETCS fuse
terminal) or +BM (E4±7) ±
Body ground
10 kW or higher
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the battery positive terminal.
CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and battery.
OK:
Standard:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
terminal) ± Battery positive terminalBelow 1 W
Engine Room J/B (ETCS fuse
terminal) or
Battery positive terminal ± Body ground
10 kW or higher
NG Repair or replace harness or connector.
OK
Check engine room J/B.

± DIAGNOSTICSENGINE
DI±367
561 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2119 Throttle Actuator Control Throttle Body
Range/Performance
CIRCUIT DESCRIPTION
The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve,
a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position
sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system.
The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs. The
throttle position sensor, mounted on the throttle body, detects the opening angle of the throttle valve and
provides this signal to the ECM so that the ECM can regulate the throttle motor.
DTC No.DTC Detection ConditionTrouble Area
P2119
Throttle opening angle continues to vary greatly from target
throttle opening angle
(1 trip detection logic)
Electric throttle control system

Throttle body
MONITOR DESCRIPTION
The ECM determines the ºactualº throttle angle based on the throttle position sensor signal. The ºactualº
throttle position is compared to the ºtargetº throttle position commanded by the ECM. If the difference of
these two values exceeds a specified limit, the ECM interprets this as a fault in the ETCS (Electronic Throttle
Control System). The ECM 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.
MONITOR STRATEGY
Related DTCsP2119Electronic throttle control system failure
Rid / tMain sensorsThrottle actuator motorRequired sensors/componentsRelated sensorsThrottle position sensor
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is
not presentSee page DI±18
The typical enabling condition is not avail-
able±
DICFC±02

DI±368
± DIAGNOSTICSENGINE
562 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Difference between ºtarget throttle positionº and ºactual
throttle positionº0.3 V or more
COMPONENT OPERATING RANGE
Standard Value
Commanded throttle position and current throttle position are nearly the same
WIRING DIAGRAM
Refer to DTC P2102 and P2103 on page DI±354.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine 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 Are there any other codes (besides DTC P2119) being output?
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand±held tester main switch ON.
(c) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand±held tester.
RESULT:
Display (DTC Output)Proceed to
P2119A
ºP2119º and other DTCB
HINT:
If any other codes besides P2119 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI±58).
A