turn signal TOYOTA SEQUOIA 2001 Service Owner's Manual

DI±300
± DIAGNOSTICSENGINE
494 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 Connect hand±held tester, and check STA signal.
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 / DATA
LIST / ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand±held tester while the starter operates.
OK:
Standard:
Ignition Switch PositionONSTART
STARTER SIGOFFON
OK Go to step 5.
NG
2 Check park/neutral position switch (See page DI±576).
NG Replace park/neutral position switch.
Go to next step 5 after the replacement.
OK
3 Check ignition switch (See page BE±24).
NG Replace ignition switch.
Go the next step 5 after the replacement.
OK

± DIAGNOSTICSENGINE
DI±301
495 Author: Date:
2005 SEQUOIA (RM1146U)
4 Connect hand±held tester, and check STA signal.
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) On the hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand±held tester while the starter operates.
OK:
Standard:
Ignition Switch PositionONSTART
STARTER SIGOFFON
NG Repair or replace harness or connector.
OK
5 Check DTC reoccur
PREPARATION:
(a) Connect the hand±held tester.
(b) Turn the ignition switch ON and hand±held tester main switch ON.
(c) Clear DTC (See page DI±43).
(d) Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more.
CHECK:
Check DTC reoccur.
RESULT:
Display (DTC Output)Proceed to
P0617A
No DTC outputB
A Replace ECM (See page SF±80).
B
Check for intermittent problems
(See page DI±11).

B17445
Wire Harness Side:
Camshaft Position Sensor
A23559
2 V / DIV
GND
Crank Angle
120°120° 180°
180°
60°60°
200 ms /DIV
B17414
E6ECM Connector
G2+
G2±
DI±306
± DIAGNOSTICSENGINE
500 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand±held tester. Because freeze frame records the engine conditions when
the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was run-
ning or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at the time of the
malfunction.
1 Check voltage of camshaft position sensor power source circuit.
PREPARATION:
(a) Disconnect the Camshaft position sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal 3 of the camshaft posi-
tion sensor connector and body ground.
OK:
Standard: 4.5 to 5.5 V
NG Repair or replace harness or connector.
OK
2 Check camshaft position sensor signal.
PREPARATION:
Start the engine.
CHECK:
Check the waveform between the G2+ (E6±19) and G2±
(E6±29) of the ECM connector.
OK:
Standard: Correct waveform is as shown.
OK Replace ECM (See page IN±35).
NG

B17411
ECM Connector
E1AIDI
A16555
AIR INJ CHECK
AIR PUMP............................ON
EASV ............................OPEN
ASV1. .............................OPEN
ASV2...............................OPEN
A/F BANK1.......................19.05
A/F BANK2.......................19.05
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.
Press [EXIT] to quit
± DIAGNOSTICSENGINE
DI±345
539 Author: Date:
2005 SEQUOIA (RM1146U) Case 3:
Diagnostic signal duty ratio from air injection driver0 %
Case 4:
Diagnostic signal duty ratio from air injection driver100 %
COMPONENT OPERATING RANGE
ParameterStandard Value
Diagnostic signal duty ratio from air injection driver
70 to 90% when secondary air injection system operating
and
0% when secondary air injection system not operating
WIRING DIAGRAM
Refer to DTC P0412 on page DI±234.
INSPECTION PROCEDURE
HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows a trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(a) Start the engine and warm it up.
(b) Turn the ignition switch to OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Connect an oscilloscope probe to the AIDI terminal of the
ECM.
(e) Start the engine and turn the tester ON.
(f) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ SYSTEM.
(g) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ CHECK / MANUAL OPERATION / OPERATION
1 and 2.
HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:OFF
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN

B17411
E4
AIDI
± DIAGNOSTICSENGINE
DI±349
543 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check voltage between AIDI terminal of ECM and body ground.
PREPARATION:
(a) Start the engine and warm it up.
(b) Turn the ignition switch to OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Start the engine.
(f) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AU-
TOMATIC OPERATION
CHECK:
Measure the voltage between terminal E4±13 (AIDI) of the
ECM connector and body ground when the air injection system
is both ON and OFF.
RESULT:
ResultsSuspected Trouble AreasProceed To
Fixed at Low (1.6 V or less)
even when AI system ON
(Air pump ON, ASV ON)

Short between air pump or air switching valve
command signal circuit and body ground

Open in air pump command signal circuit (be-
tween ECM and AID)

Open in ASV command signal circuit (between
ECM and AID)

Open in AID ground circuit (between AID and
body ground)

Diagnostic signal circuit ground short

AID

ECM
A
Fixed at High (12 V or more)
even when AI system OFF
(Air pump OFF, ASV OFF)

Open in diagnostic signal circuit (ECM ± AID)

Short between +B circuit and diagnostic signal
circuit (ECM ± AID)

Open in AID power source circuit

AID

ECM
B
Other than above:

Fluctuating (duty signal excluding 20, 40,
80%)
AID

Open in AID ground circuit (between AID and
body ground)
C
B Go to step 5.
C Go to step 8.
A

± 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

A19694A19803
5
3.7 to 4.4
2.9 to 3.6
1.6
1.4
025 IC No. 1
IC No. 2
Accelerator Pedal
Position SensorECM
VPA
EPA
VCPA
VPA2
EPA2
VCP2Usable Range
Magnet
Magnet
Accelerator Pedal Position Sensor Output Voltage (V)
: Accelerator Pedal Fully Released
: Accelerator Pedal Fully DepressedAccelerator Pedal Turning Angle (deg)*
2*1
*1
*2
± DIAGNOSTICSENGINE
DI±371
565 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
HINT:

This electrical throttle control system does not use a throttle cable.

This accelerator pedal position sensor is a non±contact type.
The accelerator pedal position sensor is mounted in the accelerator pedal to detect the angle of the accelera-
tor pedal. This sensor is electronically controlled and uses Hall±effect elements.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes
between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the
actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of
the sensor itself.
The ECM judges the current angle of the accelerator pedal from these signals input from terminals VPA and
VPA2, and the ECM controls the throttle motor based on these signals.

DI±372
± DIAGNOSTICSENGINE
566 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a) continues for 0.5 seconds or more:
(a) VPA
0.2 V or VPA  4.8 V
Accelerator pedal position sensor

ECM
P2122
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA
0.2 V
(b) VPA2  0.97 deg
Accelerator pedal position sensor

VCPA circuit open

VPA circuit open or ground short

ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA  4.8 V
Accelerator pedal position sensor

EPA circuit open

ECM
P2125
Condition (a) continues for 0.5 seconds or more:
(a) VPA2
0.5 V or VPA2  4.8 V and 0.2 V
VPA
3.45
V
Accelerator pedal position sensor

ECM
P2127
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA2
0.5 V
(b) VPA  0.97 deg
Accelerator pedal position sensor

VCP2 circuit open

VPA2 circuit open or ground short

ECM
P2128
Condition (a) and (b) continues for 2.0 seconds or more:
(a) VPA2  4.8 V
(a) 0.2 V
VPA
3.45 V
Accelerator pedal position sensor

EPA circuit open

ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) |VPA ± VPA2|
0.02 V
(b) VPA
0.2 V and VPA2
0.5 V
VPA and VPA2 circuit are short circuited

Accelerator pedal position sensor

ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand±held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble areaAccelerator pedal completely releasedAccelerator pedal fully depressedTrouble area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
E2 circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2 deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
When the voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
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.

DI±380
± DIAGNOSTICSENGINE
574 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºaccelerator pedal position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page DI±370.
DTC No.DTC Detecting ConditionTrouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFF
Accelerator pedal position sensor circuit

Accelerator pedal position sensor

ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements/signal outputs: VPA1 and VPA2. VPA1 is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. When
the difference between the voltage outputs of VPA1 and VPA2 deviates from the standard, the ECM con-
cludes the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is
set.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
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 DTCsP2121Accelerator position sensor (rationality)
Required sensors/componentsAccelerator position sensor
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DID8H±01

DI±426
± DIAGNOSTICSENGINE
620 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2444 Secondary Air Injection System Pump Stuck
ON Bank 1
DTC P2445 Secondary Air Injection System Pump Stuck
OFF Bank 1
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P2444
Air pump stuck ON.
The secondary air pressure is more than 5 kPa (38 mmHg)
despite the ECM ordering the air pump to turn off.
(2 trip detection logic)
Short in air pump circuit

Air injection driver

Pressure sensor

Open or short in pressure sensor circuit

ECM
P2445
Air pump stuck OFF or air injection volume is insufficient.
The amount of air flow is below the criteria.
(The secondary air pressure is less than specified value de-
spite the ECM ordering the air pump turn ON.)
(2 trip detection logic)

Air pump fuse

Vacuum hose

Air pump assembly

Air injection driver

Open in air pump circuit

Air injection system piping

Pressure sensor

Open or short in pressure sensor circuit

ECM
MONITOR DESCRIPTION
P2444:
The ECM observes the pressure in the secondary air passage using the pressure sensor located on the air
switching valve in the secondary air injection system. The sensor measures the pressure in the secondary
air passage and sends a signal to the ECM.
If the pressure level from the sensor exceed a certain level despite the ECM turning off the air pump, the
ECM interprets this as a fault in the secondary air injection system and sets a DTC.
P2445:
The ECM calculates the amount of air flow in the secondary air system based on the output values of the
pressure sensor and mas air flow meter.
The ECM determines whether the amount of air flow is normal or not according to the calculated value. When
the amount of air flow is below the criteria, the ECM stores the DTC and illuminates the MIL.
DIDMU±01