TOYOTA SEQUOIA 2001 Service Repair Manual

A02397
OCV Signal Waveform
1 msec./Division5 V/
Division
GND
(A) (A) (A)
B17414ECM ConnectorE6
OC1+
OC1±
OC2+OC2±
E1
± DIAGNOSTICSENGINE
DI±77
271 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between terminals OC1+ and OC1±, OC2+ and OC2± of ECM con-
nector.
CHECK:
(a) Inspection using the oscilloscope.
(b) During idling, check the waveform between the specified
terminals of the E6 ECM connector.
HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
OK:
Standard:
The correct waveform is as shown.
NG Replace ECM (See page SF±80).
OK

A23673
Wire Harness Side
C13
OCV Connector C14
B17414ECM ConnectorE6
OC1+
OC1±
OC2+OC2±
E1
DI±78
± DIAGNOSTICSENGINE
272 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in harness and connector between OCV and ECM.
PREPARATION:
(a) Disconnect the C13 or C14 OCV connector.
(b) Disconnect the E6 ECM connector.
CHECK:
(a) Check for resistance between the wire harness side con-
nectors.
OK:
Standard (Check for open):
Symbols (Terminal No.)Specified condition
OCV (C14±1) ± OC1+ (E6±17)Below 1 W
OCV (C14±2) ± OC1± (E6±16)Below 1 W
OCV (C13±1) ± OC2+ (E6±15)Below 1 W
OCV (C13±2) ± OC2± (E6±14)Below 1 W
Standard (Check for short):
Symbols (Terminal No.)Specified condition
OCV (C14±1) or OC1+ (E6±17) ± E1 (E6±1)10 kW or higher
OCV (C14±1) or OC1± (E6±16) ± E1 (E6±1)10 kW or higher
OCV (C13±1) or OC2+ (E6±15) ± E1 (E6±1)10 kW or higher
OCV (C13±1) or OC2± (E6±14) ± E1 (E6±1)10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).

± 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

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±81
275 Author: Date:
2005 SEQUOIA (RM1146U)
1 Check operation of OCV.
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 VVT system is OK.*
*: DTC P0011, P0012, P0021 or P0022 is also output when a
foreign object is detected in some parts of the system in the en-
gine oil, and then the system returns to normal in a short time.
As ECM is controlled to eject a foreign object, there is no prob-
lem on the VVT. There is also no problem on the VVT as the oil
filter should catch the foreign object in the engine oil.
NG
2 Check valve timing (See page EM±23).
NG Adjust valve timing.
OK

A02397
OCV Signal Waveform
200 msec./Division5 V/
Division
GND
(A) (A) (A)
B17414ECM ConnectorE6
OC1+
OC1±
OC2+OC2±
E1
B12806
Ohmmeter
DI±82
± DIAGNOSTICSENGINE
276 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between terminals OCV+ and OCV± of ECM connector.
CHECK:
(a) Inspection using the oscilloscope.
(b) During idling, check the waveform between the specified
terminals of the E6 ECM connector.
HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
OK:
Standard:
The correct waveform is as shown.
NG Check and replace ECM (See page IN±35).
OK
4 Check OCV.
PREPARATION:
(a) Remove the V±bank cover.
(b) Remove the air cleaner inlet and intake air connector.
(c) Disconnect the oil control valve connector.
CHECK:
(a) Using an Ohmmeter, measure the resistance between
the terminals.
Resistance: 6.9 ± 7.9 W at 20°C (68°F)
NG Replace OCV, and then go to step 6.
OK

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

DI±84
± DIAGNOSTICSENGINE
278 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check whether or not DTC P0010, P0012, P0021 or P0022 is stored.
PREPARATION:
(a) Clear the DTC (See page DI±43).
(b) Perform simulation test.
CHECK:
Check whether or not DTC P0011, P0012, P0021 or P0022 is stored (See page DI±43).
OK:
Standard: DTC P0011, P0012, P0021 or P0022 is not stored.
OK VVT system is OK.*
*: DTC P0011, P0012, P0021 or P0022 is also output when a
foreign object is detected in some parts of the system in the en-
gine oil, and then the system returns to normal in a short time.
As ECM is controlled to eject a foreign object, there is no prob-
lem on the VVT. There is also no problem on the VVT as the oil
filter should catch the foreign object in the engine oil.
NG
Replace ECM.

± 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