TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSENGINE
DI±67
261 Author: Date:
2005 SEQUOIA (RM1146U)P0617
(DI±298)
Starter Relay Circuit High

Park/neutral position switch

Starter relay circuit

Ignition switch

ECM

P0630
(DI±302)VIN not Programmed or Mis-
match±ECM/PCM
ECM
P0657
(DI±296)Actuator Supply Voltage Circuit/
Open
ECM
P0705
(DI±576)Transmission Range Sensor Cir-
cuit Malfunction (PRNDL Input)
Electronic Controlled Automatic Transaxle (ECT)
P0710
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit
Electronic control automatic transmission (ECT)
P0711
(DI±588)Transmission Fluid Temperature
Sensor ºAº Performance
Electronic control automatic transmission (ECT)
P0712
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit Low Input
Electronic control automatic transmission (ECT)
P0713
(DI±582)Transmission Fluid Temperature
Sensor ºAº Circuit High Input
Electronic control automatic transmission (ECT)
P0717
(DI±591)Input/Turbine Speed Sensor ºAº
Circuit No Signal
Electronic control automatic transmission (ECT)
P0722
(DI±596)Output Speed Sensor Circuit No
Signal
Electronic control automatic transmission (ECT)
P0724
(DI±600)Brake Switch ºBº Circuit High
Electronic control automatic transmission (ECT)
P0748
(DI±603)Pressure Control Solenoid ºAº
Electrical (Shift Solenoid Valve
SL1)

Electronic control automatic transmission (ECT)
P0751
(DI±608)Shift Solenoid ºAº Performance
(Shift Solenoid Valve S1)
Electronic control automatic transmission (ECT)
P0756
(DI±614)Shift Solenoid ºBº Performance
(Shift Solenoid Valve S2)
Electronic control automatic transmission (ECT)
P0771
(DI±620)Shift Solenoid ºEº Performance
(Shift Solenoid Valve SR)
Electronic control automatic transmission (ECT)
P0776
(DI±625)Pressure Control Solenoid ºBº
Performance (Shift Solenoid
Valve SL2)

Electronic control automatic transmission (ECT)
P0778
(DI±631)Pressure Control Solenoid ºBº
Electrical (Shift Solenoid Valve
SL2)

Electronic control automatic transmission (ECT)
P0781
(DI±636)1±2 Shift (1±2 Shift Valve)
Electronic control automatic transmission (ECT)
P0973
(DI±641)Shift Solenoid ºAº Control Circuit
Low (Shift solenoid Valve S1)
Electronic control automatic transmission (ECT)
P0974
(DI±641)Shift Solenoid ºAº Control Circuit
High (Shift solenoid Valve S1)
Electronic control automatic transmission (ECT)
P0976
(DI±646)Shift Solenoid ºBº Control Circuit
Low (Shift solenoid Valve S2)
Electronic control automatic transmission (ECT)
P0977
(DI±646)Shift Solenoid ºBº Control Circuit
High (Shift solenoid Valve S2)
Electronic control automatic transmission (ECT)
P0985
(DI±651)Shift Solenoid ºEº Control Circuit
Low (Shift Solenoid Valve SR)
Electronic control automatic transmission (ECT)

DI±68
± DIAGNOSTICSENGINE
262 Author: Date:
2005 SEQUOIA (RM1146U)P0986
(DI±651)
Shift Solenoid ºEº Control Circuit
High (Shift Solenoid Valve SR)
Electronic control automatic transmission (ECT)
P1340
(DI±304)Camshaft Position Sensor ºAº
Circuit (Bank 1 Sensor 2)

Open or short in camshaft position sensor circuit

Camshaft position sensor

LH camshaft timing pulley

ECM

P1341
(DI±304)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 Sensor 2)
Open or short in camshaft position sensor circuit

Camshaft position sensor

LH camshaft timing pulley

ECM

P1440
(DI±309)Scondary Air Injection System
Control Valve Circuit Bank 1
Open or short in VSV for air injection control circuit

ECM
P1441
(DI±314)Scondary Air Injection System
Switching Valve No.2 Bank 1
Stuck Open
VSV for air injection control circuit (Bank 1)

Air switching valve No.2 (Bank 1)

VSV for air injection system (Bank 1)

ECM

P1442
(DI±330)Scondary Air Injection System
Switching Valve No.2 Bank 1
Stuck Close

VSV for air injection control circuit (Bank 1)

Vacuum hose (VSV for air injection control ± air switching
valve No.2)

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

Air switching valve No.2 (Bank 1)

VSV for air injection control (Bank 1)

ECM

P1443
(DI±309)Scondary Air Injection System
Control Valve Circuit Bank 2
Open or short in VSV for air injection control circuit

ECM
P1444
(DI±314)Scondary Air Injection System
Switching Valve No.2 Bank 2
Stuck Open
VSV for air injection control circuit (Bank 2)

Air switching valve No.2 (Bank 2)

VSV for air injection system (Bank 2)

ECM

P1445
(DI±330)Scondary Air Injection System
Switching Valve No.2 Bank 2
Stuck Cloes

VSV for air injection control circuit (Bank 2)

Vacuum hose (VSV for air injection control ± air switching
valve No.2)

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

Air switching valve No.2 (Bank 2)

VSV for air injection control (Bank 2)

ECM

P1613
(DI±343)Air Injection System Air Injection
Driver

Short between air pump circuit and body ground

Open in air pump drive circuit

Short between air pump circuit and +B circuit

Air injection driver

ECM

P2102
(DI±354)Throttle Actuator Control Motor
Circuit Low
Open in throttle control motor and sensor circuit

Throttle control motor and sensor

ECM

P2103
(DI±354)Throttle Actuator Control Motor
Circuit High

Short in throttle control motor and sensor circuit

Throttle control motor and sensor

Throttle valve

Throttle body

ECM

P2111
(DI±358)Throttle Actuator Control System
± Stuck Open

Throttle control motor and sensor circuit

Throttle control motor and sensor

Throttle valve

Throttle body


± DIAGNOSTICSENGINE
DI±69
263 Author: Date:
2005 SEQUOIA (RM1146U)P2112
(DI±358)
Throttle Actuator Control System
± Stuck Closed

Throttle control motor and sensor circuit

Throttle control motor and sensor

Throttle valve

Throttle body

P2118
(DI±362)Throttle Actuator Control Motor
Current Range/Performance
Open in throttle control motor and sensor power source circuit

ETCS fuse

ECM

P2119
(DI±367)Throttle Actuator Control Throttle
Body Range/Performance
Electric throttle control system

Throttle body
P2120
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº Circuit
Accelerator pedal position sensor

ECM
P2121
(DI±380)Throttle/Pedal Position Sensor/
Switch ºDº Circuit Range/Perfor-
mance

Accelerator pedal position sensor
P2122
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº Circuit Low Input

Accelerator pedal position sensor

VCPA circuit open

VPA circuit open or ground short

ECM

P2123
(DI±370)Throttle/Pedal Position Sensor/
Switch ºDº Circuit High Input
Accelerator pedal position sensor

EPA circuit open

ECM

P2125
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº Circuit
Accelerator pedal position sensor

ECM
P2127
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº Circuit Low Input

Accelerator pedal position sensor

VCP2 circuit open

VPA2 circuit open or ground short

ECM

P2128
(DI±370)Throttle/Pedal Position Sensor/
Switch ºEº Circuit High Input
Accelerator pedal position sensor

EPA circuit open

ECM

P2135
(DI±127)Throttle Pedal Position Sensor/
Switch ºAº / ºBº Voltage Correla-
tion
Throttle control motor and sensor

VTA1 and VTA2 circuit are short±circuited

ECM

P2138
(DI±370)Throttle Pedal Position Sensor/
Switch ºDº / ºEº Voltage Correla-
tion
VPA and VPA2 circuit are short circuited

Accelerator pedal position sensor

ECM

P2195
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Lean (Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

Air induction system

Fuel pressure

Injector

ECM

P2196
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Rich (Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

Air induction system

Fuel pressure

Injector

ECM


DI±70
± DIAGNOSTICSENGINE
264 Author: Date:
2005 SEQUOIA (RM1146U)P2197
(DI±383)
Oxygen (A/F) Sensor Signal
Stuck Lean (Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

Air induction system

Fuel pressure

Injector

ECM

P2198
(DI±383)Oxygen (A/F) Sensor Signal
Stuck Rich (Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

Air induction system

Fuel pressure

Injector

ECM

P2238
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit Low (For A/F Sensor)
(Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2239
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2241
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit Low (For A/F Sensor)
(Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2242
(DI±402)Oxygen Sensor Pumping Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2252
(DI±402)Oxygen Sensor Reference
Ground Current Circuit Low (For
A/F Sensor) (Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2253
(DI±402)Oxygen Sensor Reference Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 1 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2255
(DI±402)Oxygen Sensor Reference
Ground Current Circuit Low (For
A/F Sensor) (Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits

P2256
(DI±402)Oxygen Sensor Reference Cur-
rent Circuit High (For A/F Sen-
sor) (Bank 2 Sensor 1)

Open or short in A/F sensor (sensor 1) circuit

A/F sensor (sensor 1)

A/F sensor heater (sensor 1)

A/F relay

A/F sensor heater and EFI relay circuits


± 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

A07621A09776
1
2L±W
P±LOC1+
OC1±
OC2+
OC2± 17
L±B
R±L 1
2E6 C13
OCV (Bank 1)
C14
OCV (Bank 2)ECM
16
15
14 E6
E6
E6
± DIAGNOSTICSENGINE
DI±75
269 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P0010 displayed, check left bank OCV circuit.

If DTC P0020 displayed, check right bank OCV circuit.

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 ve-
hicle 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.

A31449A23511
Valve Battery ±
Battery +
DI±76
± DIAGNOSTICSENGINE
270 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check OCV circuit.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Start the engine and warm it up.
(c) Turn the ignition switch to ON and turn the hand±held tester ON.
CHECK:
(a) Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
(b) Using the hand±held tester, operate the OCV and check the engine speed.
OK:
Standard:
Tester OperationSpecified Condition
OCV is OFFNormal engine speed
OCV is ONRough idle or engine stall
OK Check for intermittent problems
(See page DI±11).
NG
2 Check operation of OCV.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Disconnect the OCV connector.
(c) Apply battery positive voltage between the terminals of
the OCV.
CHECK:
Check the engine speed.
OK:
Rough idle or engine stalled.
NG Replace OCV.
OK