2001 TOYOTA SEQUOIA cam
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A23651
20 msec./DIV 5 V/DIV
(a)
(b)
Ground
Ground
A23652
10 msec./DIV 1 V/DIV
Ground
A23653
1 msec./DIV 5 V/DIV
Ground
A23654
1 msec./DIV 5 V/DIV
Ground
A23655
(a)
(b)
20 msec./DIV 2 V/DIV
Ground
Ground
DI±38
± DIAGNOSTICSENGINE
232 Author: Date:
2005 SEQUOIA (RM1146U)
WAVEFORM 5
(a) Camshaft position sensor
(b) Crankshaft position sensor
ECM Terminal Name(a) Between G2+ and G2±
(b) Between NE+ and NE±
Tester Range5 V/DIV, 20 msec./DIV
ConditionIdle after engine warmed±up
HINT:
The wavelength becomes shorter as the engine rpm increases.
WAVEFORM 6
Vehicle speed signal
ECM Terminal NameBetween SP2+ and SP2±
Tester Range5 V/DIV, 10 msec./DIV
ConditionDriving by 40 km/h (25 mph)
HINT:
The wavelength becomes shorter as vehicle speed increases.
WAVEFORM 7
Throttle actuator positive terminal
ECM Terminal NameBetween M+ and ME01
Tester Range5 V/DIV, 1 msec./DIV
ConditionIdle after engine warmed±up
HINT:
The duty ratio varies depending on the throttle opening opera-
tion.
WAVEFORM 8
Throttle actuator negative terminal
ECM Terminal NameBetween M± and ME01
Tester Range5 V/DIV, 1 msec./DIV
ConditionIdle after engine warmed±up
HINT:
The duty ratio varies depending on the throttle opening opera-
tion.
WAVEFORM 9
(a) Igniter IGT signal (from ECM to igniter)
(b) Igniter IGF signal (from igniter to ECM)
ECM Terminal Name(a) Between IGT1 (to IGT8) and E1
(b) Between IGF1 (IGF2) and E1
Tester Range2 V/DIV, 20 msec./DIV
ConditionIdling
HINT:
The wavelength becomes shorter as vehicle speed increases.
Page 252 of 4323
DI3HB±12
DI±58
± DIAGNOSTICSENGINE
252 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for the codes listed
in the table below. For details of each code, refer to the ºSee pageº under the respective ''DTC No.'' in the
DTC chart.
DTC No.
(See page)Detection ItemTrouble AreaMIL*1Memory
P0010
(DI±73)Camshaft Position ºAº Actuator
Circuit (Bank 1)Open or short in OCV circuit
OCV
ECM
P0011
(DI±79)Camshaft Position ºAº ±Timing
Over± Advanced or System Per-
formance (Bank 1)Valve timing
OCV
VVT controller assembly
ECM
P0012
(DI±79)Camshaft Position ºAº ±Timing
Over± Retarded (Bank 1)
Valve timing
OCV
VVT controller assembly
ECM
P0016
(DI±85)Crankshaft Position ± Camshaft
Position Correlation (Bank 1
Sensor A)Open or short in VVT sensor circuit
VVT sensor
ECM
P0018
(DI±85)Crankshaft Position ± Camshaft
Position Correlation (Bank 2
Sensor A)Open or short in VVT sensor circuit
VVT sensor
ECM
P0020
(DI±73)Camshaft Position ºAº Actuator
Circuit (Bank 2)Open or short in OCV circuit
OCV
ECM
P0021
(DI±79)Camshaft Position ºAº ±Timing
Over± Advanced or System Per-
formance (Bank 2)Valve timing
OCV
VVT controller assembly
ECM
P0022
(DI±79)Camshaft Position ºAº ±Timing
Over± Retarded (Bank 2)
Valve timing
OCV
VVT controller assembly
ECM
P0031
(DI±88)Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 1 Sen-
sor 1)Open in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0032
(DI±88)Oxygen (A/F) Sensor Heater
Control Circuit High (Bank 1
Sensor 1)Short in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0037
(DI±93)Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 2)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
P0038
(DI±93)Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 2)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
Page 258 of 4323
DI±64
± DIAGNOSTICSENGINE
258 Author: Date:
2005 SEQUOIA (RM1146U)P0308
(DI±184)
Cylinder 8 Misfire Detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temperature sensor
Compression pressure
Valve clearance
Valve timing
PCV piping
ECM
*2
P0325
(DI±204)Knock Sensor 1 Circuit (Bank 1
or Single Sensor)Open or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM
P0327
(DI±204)Knock Sensor 1 Circuit Low In-
put (Bank 1 or Single Sensor)Short in knock sensor circuit
Knock sensor
ECM
P0328
(DI±204)Knock Sensor 1 Circuit High In-
put (Bank 1 or Single Sensor)Open in knock sensor circuit
Knock sensor
ECM
P0330
(DI±204)Knock Sensor 2 Circuit (Bank 2)
Open or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM
P0332
(DI±204)Knock Sensor 2 Circuit High In-
put (Bank 2)Open in knock sensor circuit
Knock sensor
ECM
P0333
(DI±204)Knock Sensor 2 Circuit High In-
put (Bank 2)Open in knock sensor circuit
Knock sensor
ECM
P0335
(DI±210)Crankshaft Position Sensor ºAº
Circuit
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Signal plate
ECM
P0339
(DI±210)Crankshaft Position Sensor ºAº
Circuit Intermittent
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Signal plate
ECM
±
P0340
(DI±216)Camshaft Position Sensor ºAº
Circuit (Bank 1 or Single Sensor)
Open or short in camshaft position sensor circuit
Camshaft position sensor
LH camshaft timing pulley
Jumping teeth of timing belt
ECM
P0341
(DI±216)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 1 or Single Sensor)
Open or short in camshaft position sensor circuit
Camshaft position sensor
LH camshaft timing pulley
Jumping teeth of timing belt
ECM
P0345
(DI±221)Camshaft Position Sensor ºAº
Circuit (Bank 2)Open or short in camshaft position sensor circuit
VVT sensor
ECM
P0346
(DI±221)Camshaft Position Sensor ºAº
Circuit Range/Performance
(Bank 2)Open or short in camshaft position sensor circuit
VVT sensor
ECM
Page 262 of 4323
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 1Open or short in VSV for air injection control circuit
ECM
P1441
(DI±314)Scondary Air Injection System
Switching Valve No.2 Bank 1
Stuck OpenVSV 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 2Open or short in VSV for air injection control circuit
ECM
P1444
(DI±314)Scondary Air Injection System
Switching Valve No.2 Bank 2
Stuck OpenVSV 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 LowOpen 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
Page 267 of 4323
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
Page 273 of 4323
± DIAGNOSTICSENGINE
DI±79
273 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0011 Camshaft Position ºAº ±Timing Over±
Actuator or System Performance (Bank 1)
DTC P0012 Camshaft Position ºAº ±Timing Over±
Retarded (Bank 1)
DTC P0021 Camshaft Position ºAº ±Timing Over±
Actuator or System Performance (Bank 2)
DTC P0022 Camshaft Position ºAº ±Timing Over±
Retarded (Bank 2)
CIRCUIT DESCRIPTION
Refer to DTCs P0010 on page DI±73.
DTC No.DTC Detecting ConditionTrouble Area
P0011
P0021
Advanced cam timing:
After engine is warmed up and engine speed is at 400 to
4,000 rpm, condition (a) continues. (1 trip detection logic)
(a) Valve timing does not change from current valve timing
Valve timing
OCV
P0012
P0022
Retarded cam timing:
After engine is warmed up and engine speed is at 400 to
4,000 rpm, condition (a) continues. (2 trip detection logic)
(a) Valve timing does not change from current valve timing
OCV
VVT controller assembly
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 ºduty±cycleº 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.
Example:
A DTC will set if: 1) the difference between the target and actual valve timing is more than 5 degrees of the
crankshaft angle (CA) and the condition continues for more than 4.5 sec.; or 2) the OCV is forcibly activated
63 times or more.
Advanced cam DTCs are subject to º1 tripº detection logic.
Retarded cam DTCs are subject to º2 tripº detection logic.
DIAON±02
Page 274 of 4323
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.
Page 277 of 4323
A02852
A23658
± DIAGNOSTICSENGINE
DI±83
277 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check VVT controller assembly.
PREPARATION:
(a) Remove the timing belt (See page EM±16).
(b) Remove the cylinder head cover.
(c) Remove the OCV (See page SF±46).
(d) Drain the oil in the VVT controller assembly
(See page EM±36).
CHECK:
Check whether the oil in VVT controller assembly is drained or
not.
OK:
Standard:
The oil in VVT controller assembly is drained.
NG Replace VVT controller assembly, and then go
to step 6.
OK
6 Check oil control valve filter.
PREPARATION:
(a) Remove the cylinder head cover.
(b) Remove the camshaft bearing cap and OCV filter.
CHECK:
Check that the filter is not clogged.
OK:
The filter is not clogged.
NG Repair or replace.
OK