2001 TOYOTA SEQUOIA Page 18

DI±54
± DIAGNOSTICSENGINE
248 Author: Date:
2005 SEQUOIA (RM1146U)FC TAU
Fuel cut TAU: Fuel cut during very
light load:
ON or OFF
ON: Fuel cut operating
The fuel cut being performed un-
der very light load to prevent the
engine combustion from becoming
incomplete
IGNITIONIgnition counter:
Min.: 0, Max.: 8000 to 800'
CYL #1, #2, #3, #4, #5, #6, #7, #8Misfire ratio of the cylinder 1 to 4:
Min.: 0, Max.: 2550 %This item displayed in only idling
CYL ALLAll cylinders misfire rate:
Min.: 0, Max.: 2550 to 35'
MISFIRE RPMEngine RPM for first misfire range:
Min.: 0 rpm, Max.: 6,375 rpm0 rpm: Misfire 0'
MISFIRE LOADEngine load for first misfire range:
Min.: 0 g/rev, Max.: 3.98 g/rev0 g/rev: Misfire 0'
MISFIRE MARGINMisfire monitoring:
MIn.: ±100 %, Max.: 99.22 %±100 to 99.2 %Misfire detecting margin
#CODES#Codes:
Min.: 0, Max.: 255'Number of detected DTCs
CHECK MODECheck mode:
0: ON, 1: OFFON: Check mode ONSee page DI±44
SPD TEST
Check mode result for vehicle
speed sensor:
0: COMPL, 1: INCOMPL
''
AS TEST
Check mode result for secondary
air injection system:
0: COMPL, 1: INCOMPL
''
MISFIRE TEST
Check mode result for misfire
monitor:
0: COMPL, 1: INCOMPL
''
OXS1 TEST
Check mode result for HO2 sen-
sor :
0: COMPL, 1: INCOMPL
''
OXS2 TEST
Check mode result for HO2 sen-
sor :
0: COMPL, 1: INCOMPL
''
A/F SSR TEST B1
Check mode result for air±fuel ra-
tio sensor :
0: COMPL, 1: INCOMPL
''
A/F SSR TEST B2
Check mode result for air±fuel ra-
tio sensor :
0: COMPL, 1: INCOMPL
''
MILMIL status:
ON or OFFON: MIL ON'
MIL ON RUN DIST
MIL ON Run Distance:
Min.: 0 second,
Max.: 65,535 seconds
Distance after DTC detected'
MIL ON RUN TIME
Running time from MIL ON:
Min.: 0 minute,
Max.: 65,535 minutesEquivalent to running time after
MIL was ON'
ENG RUN TIME
Engine run time:
Min.: 0 second,
Max.: 65,535 seconds
Time after engine startService data
TIME DTC CLEAR
Time after DTC cleared:
Min.: 0 minute,
Max.: 65,535 minutesEquivalent to time after DTCs
were erased'

± DIAGNOSTICSENGINE
DI±57
251 Author: Date:
2005 SEQUOIA (RM1146U)
3. SYSTEM CHECK
HINT:
Performing a SYSTEM CHECK enables the system, which consists of multiple actuators, to be operated
without removing any parts. In addition, it can show whether or not any DTCs are set, and can detect poten-
tial malfunctions in the system. The SYSTEM CHECK can be performed with a hand±held tester.
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK.
(e) Perform the SYSTEM CHECK by referring to the table below.
Hand±held Tester DisplaysTest DetailsRecommended Fuel TemperaturesDiagnostic Notes
EVAP SYS CHECK
(AUTO OPERATION)Perform 5 steps in order to oper-
ate EVAP key±off monitor auto-
matically
35C (95F) or less

If no DTCs in PENDING CODE
after performing this test, system
functioning normally

Refer to EVAP Inspection Proce-
dure on page DI±460
EVAP SYS CHECK
(MANUAL OPERATION)Perform 5 steps in order to oper-
ate EVAP key±off monitor manual-
ly
35C (95F) or less

Used to detect malfunctioning
parts

Refer to EVAP Inspection Proce-
dure on page DI±460
AI INJ CHECK
(AUTO OPERATION)Perform 6 steps in order to oper-
ate air injection system automati-
cally
±

If no DTCs in PENDING CODE
after performing this test, system
functioning normally
AI INJ CHECK
(MANUAL OPERATION)Perform 8 operations in order to
operate air injection system moni-
tor manually
±
Used to detect malfunctioning
parts

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


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

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

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