2001 TOYOTA SEQUOIA sensor

± DIAGNOSTICSENGINE
DI±71
265 Author: Date:
2005 SEQUOIA (RM1146U)P2401
(DI±410)
Evaporative Emission System
Leak Detection Pump Control
Circuit Low
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2402
(DI±410)Evaporative Emission System
Leak Detection Pump Control
Circuit High
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2419
(DI±416)Evaporate Emission System
Switching Valve Control Circuit
Low
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2420
(DI±416)Evaporate Emission System
Switching Valve Control Circuit
High
Pump module

Connector/Wire harness (between pump module and ECM)

ECM

P2430
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2431
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Range/Performance Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2432
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
Low Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2433
(DI±422)Secondary Air Injection System
Air Flow/Pressure Sensor Circuit
High Bank 1

Pressure sensor

Open or short in pressure sensor circuit

Vacuum hose

Check valve

ECM

P2440
(DI±314)Secondary Air Injection System
Switching Valve Stuck Open
Bank 1

Electromagnetic air switching valve

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection system (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM

P2441
(DI±330)Secondary Air Injection System
Switching Valve Stuck Close
Bank 1

Vacuum hoses (Throttle body ± VSVs for air injection control)

Electromagnetic air switching valve

Air injector pipe (Air switching valve No.2 ± exhaust manifold)

Air injection hose

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection control (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM

P2444
(DI±426)Secondary Air Injection System
Pump Stuck On Bank 1

Short in air pump circuit

Pressure sensor

Air pump assembly

Open or short in pressure sensor circuit

ECM


DI±72
± DIAGNOSTICSENGINE
266 Author: Date:
2005 SEQUOIA (RM1146U)P2445
(DI±426)
Secondary Air Injection System
Pump Stuck On Bank 1

Air pump fuse

Vacuum hose

Air pump assembly

Open in air pump circuit

Air injection system piping

Pressure sensor

Open or short in pressure sensor circuit

ECM

P2610
(DI±442)ECM/PCM Internal Engine Off
Timer Performance
ECM
P2714
(DI±656)Pressure Control Solenoid ºDº
Performance (Shift Solenoid
Valve SLT)

Electronic control automatic transmission (ECT)
P2716
(DI±662)Pressure Control Solenoid ºDº
Electrical (Shift Solenoid Valve
SLT)

Electronic control automatic transmission (ECT)
P2740
(DI±666)Transmission Fluid Temperature
Sensor ºBº Circuit
Electronic control automatic transmission (ECT)
P2742
(DI±666)Transmission Fluid Temperature
Sensor ºBº Circuit Low Input
Electronic control automatic transmission (ECT)
2743
(DI±666)Transmission Fluid Temperature
Sensor ºBº Circuit High Input
Electronic control automatic transmission (ECT)
P2757
(DI±672)
Torque Converter clutch Pres-
sure Control Solenoid Perfor-
mance (Shift Solenoid Valve
SLU)

Electronic control automatic transmission (ECT)
P2759
(DI±680)Torque Converter clutch Pres-
sure Control Solenoid Electrical
(Shift Solenoid Valve SLU)

Electronic control automatic transmission (ECT)
P2772
(DI±685)Transfer L4 SW Circuit
Electronic control automatic transmission (ECT)
P2A00
(DI±451)A/F Sensor Circuit Slow Re-
sponse (Bank 1 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

ECM

P2A03
(DI±451)A/F Sensor Circuit Slow Re-
sponse (Bank 2 Sensor 1)
Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

ECM

B2799
(DI±1580)Engine Immobilizer System Mal-
function
Immobilizer system±
U0001
(DI±444)High Speed CAN Communica-
tion Bus
ECM
*1: ± .... MIL does not light up.  .... MIL lights up.
*2: MIL lights up or blinks.

DID82±01
A20891
Mass Air Flow Sensor Crankshaft Position Sensor
Actual Valve TimingCorrection Target Valve Timing
Feedback
Duty Control ECM
Camshaft Timing
Oil Control
Valve (OCV)
Vehicle Speed Signal Engine Coolant Temp. Sensor Throttle Position Sensor
Camshaft Position Sensor
± DIAGNOSTICSENGINE
DI±73
267 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC P0010 Camshaft Position ºAº Actuator circuit
(Bank 1)
DTC P0020 Camshaft Position ºAº Actuator circuit
(Bank 2)
CIRCUIT DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT control-
ler. The ECM sends a target ºduty±cycleº control signal to the OCV. This control signal, applied to the OCV,
regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on en-
gine operation conditions such as intake air volume, throttle position and engine coolant temperature.
The ECM controls the OCV, based on the signals output from the sensors. The VVT controller regulates the
intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the cam-
shaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust
emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using
signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback con-
trol. This is how target valve timing is verified by the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P0010
P0020Open or short in OCV circuit

Open or short in OCV circuit

OCV

ECM

DI±74
± DIAGNOSTICSENGINE
268 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
After the ECM sends the ºtargetº duty±cycle signal to the OCV (Oil Control Valve), the ECM monitors the
OCV current to establish an ºactualº duty±cycle. When the actual duty±cycle ratio varies from the target
duty±cycle, the ECM sets a DTC.
MONITOR STRATEGY
RltdDTCP0010VVT oil control valve bank 1 range checkRelated DTCsP0020VVT oil control valve bank 2 range check
Required sensors/componentsOCV
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Battery voltage11 V13 V
Target duty ratio±70%
StarterOFF
Current cut statusNot cut
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Either of the following conditions is met:Condition 1 or 2
1. Output signal duty for OCVOutput duty ratio is 100% (always ON) but target duty ratio is less than 70%
2. Output signal duty for OCVOutput duty is 3% or less despite the ECM supplying current to the OCV
COMPONENT OPERATING RANGE
ParameterStandard Value
Output signal duty for OCVºMore than 3%º and ºless than 100%º

DI±80
± DIAGNOSTICSENGINE
274 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
P0011VVT system advance (Bank 1)
RltdDTCP0012VVT system retard (Bank 1)Related DTCsP0021VVT system advance (Bank 2)
P0022VVT system retard (Bank 2)
Main sensors/componentsCamshaft position sensor
Required sensors/componentsRelated sensors/componentsEngine coolant temperature sensor,
Crankshaft position sensor
Frequency of operationOnce per drive cycle
Duration10 sec.
MIL operationP0011, P0021: Immediate
P0012, P0022: 2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Battery voltage11 V±
Throttle position learningCompleted
Engine RPM400 rpm4,000 rpm
Engine coolant temperature75C (167F)100C (212F)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Deviation of valve timingMore than 5CA
OCV activation63 times or more
Response of valve timing1 sec./1CA or more
WIRING DIAGRAM
Refer to DTCs P0010 on page DI±73.
INSPECTION PROCEDURE
HINT:

Bank 1 refers to bank that includes cylinder No. 1.

Bank 2 refers to bank that does not include cylinder No. 1.

If DTC P0011, P0012 is displayed, check the bank 1 VVT system.

If DTC P0021, P0022 is displayed, check the bank 2 VVT system.

Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at
the time of the malfunction.

± DIAGNOSTICSENGINE
DI±85
279 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0016 Crankshaft Position ± Camshaft Position
Correlation (Bank 1 Sensor A)
DTC P0018 Crankshaft Position ± Camshaft Position
Correlation (Bank 2 Sensor A)
CIRCUIT DESCRIPTION
VVT sensor (VVL or VVR signal) consist of a signal plate and pickup coil.
The VVL or VVR signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control
the intake valve timing in response to during condition.
DTC No.DTC Detecting ConditionTrouble Area
No VVT sensor signal to ECM during cranking at 4 sec. or
more
P0016
P0018No VVT sensor signal to ECM with 5 sec. or more engine
speed 600 rpm or more
Open or short in VVT sensor circuit

VVT sensor

ECMP0018
While the crankshaft rotates twice, VVT sensor signal will be
input to ECM 5 times
ECM
MONITOR DESCRIPTION
The ECM optimizes the valve timing using the VVT (Variable Valve Timing) system to control the intake valve
camshaft. The VVT system includes the ECM, the OCV (Oil Control Valve) and the VVT controller. The ECM
sends a target duty±cycle control signal to the OCV. This control signal, applied to the OCV, regulates the
oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve cam-
shaft. The ECM calibrates the valve timing of the VVT system by setting the camshaft to the maximum retard
angle when the engine is idle. The ECM closes the OCV to retard the cam. The ECM stores this value as
VVT learning value (When the difference between the target valve timing and the actual valve timing is 5
degrees or less, the ECM stores this in its memory.).
If the learning value meets both of the following conditions ((a) and (b)), the ECM interprets this as a defect
in the VVT system and sets a DTC.
(a) VVT learning value is less than 20°CA (Crankshaft Angle) or more than 39°CA.
(b) Above condition continues for more than 18 sec.
DIAOO±02

DI±86
± DIAGNOSTICSENGINE
280 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
RltdDTC
P0016Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 1)
Related DTCs
P0018Deviation in crankshaft position sensor signal
and camshaft position sensor signal (Bank 2)
Rid / tC k h ft iti C h ft itiRequired sensors/componentsCrankshaft position sensor, Camshaft position sensor
Frequency of operationOnce per drive cycle
Duration60 sec.
MIL operation2 drive cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Engine RPM400 rpm1,400 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Duration that either of the following conditions 1 or 2 is met18 sec. or more
1. VVT angle when camshaft is retarded maximumLess than 20CA
2. VVT angle when camshaft is retarded maximumMore than 39CA

A02961
V5
VVT Sensor (Bank 1)ECM
1
2R
G
Y
LVVL+
VVL±
VVR+
E5 18
19
19
18
VVR±
1
2E5
E4
E4 V6
VVT Sensor (Bank 2)
± DIAGNOSTICSENGINE
DI±87
281 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P0016 is displayed, check left bank VVT sensor.

If DTC P0018 is displayed, check right bank VVT sensor.

Read freeze frame data using hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for deter-
mining whether the vehicle was running 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 valve timing (Check for loose and jumping teeth of timing belt) (See page
EM±16).
NG Adjust valve timing (Repair or replace timing
belt).
OK
Replace ECM (See page SF±80).