Toyota Sequoia (2005). Manual - part 67

–

DIAGNOSTICS

ENGINE

DI–71

265

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

–

DIAGNOSTICS

ENGINE

266

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 ”D”

Performance (Shift Solenoid

Valve SLT)

Electronic control automatic transmission (ECT)





P2716

(

DI–662

)

Pressure Control Solenoid ”D”

Electrical (Shift Solenoid Valve

SLT)

Electronic control automatic transmission (ECT)





P2740

(

DI–666

)

Transmission Fluid Temperature

Sensor ”B” Circuit

Electronic control automatic transmission (ECT)





P2742

(

DI–666

)

Transmission Fluid Temperature

Sensor ”B” Circuit Low Input

Electronic control automatic transmission (ECT)





2743

(

DI–666

)

Transmission Fluid Temperature

Sensor ”B” 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 Timing

Correction

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

–

DIAGNOSTICS

ENGINE

DI–73

267

CIRCUIT INSPECTION

DTC

P0010

Camshaft Position ”A” Actuator circuit
(Bank 1)

DTC

P0020

Camshaft Position ”A” 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 ”duty–cycle” 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 Condition

Trouble Area

P0010

P0020

Open or short in OCV circuit

Open or short in OCV circuit

OCV

ECM

DI–74

–

DIAGNOSTICS

ENGINE

268

MONITOR DESCRIPTION

After the ECM sends the ”target” duty–cycle signal to the OCV (Oil Control Valve), the ECM monitors the
OCV current to establish an ”actual” duty–cycle. When the actual duty–cycle ratio varies from the target
duty–cycle, the ECM sets a DTC.

MONITOR STRATEGY

R l t d DTC

P0010

VVT oil control valve bank 1 range check

Related DTCs

P0020

VVT oil control valve bank 2 range check

Required sensors/components

OCV

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever this DTC is

not present

See page 

DI–18

Battery voltage

11 V

13 V

Target duty ratio

–

70%

Starter

OFF

Current cut status

Not cut

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Either of the following conditions is met:

Condition 1 or 2

1. Output signal duty for OCV

Output duty ratio is 100% (always ON) but target duty ratio is less than 70%

2. Output signal duty for OCV

Output duty is 3% or less despite the ECM supplying current to the OCV

COMPONENT OPERATING RANGE

Parameter

Standard Value

Output signal duty for OCV

”More than 3%” and ”less than 100%”