ECO mode TOYOTA SEQUOIA 2001 Service User Guide

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'

A15466A19380
Battery I18
Ignition SW
1
#80 #60 #40#20
#70#50ECM
#30 #10
6
2
I10 Injector No.2
I12 Injector No.4
I13 Injector No.5
I14 Injector No.6
I15 Injector No.7
I16 Injector No.8
7
1
2
12
1
2 1
2
1
2
2
2
2 3 2
5
7 4
I9 Injector No.1
1C
2D1
B
F10
Fusible Link BlockIGN2
Engine Room J/B
54
B2C1 1C
1J 1D 2
3
W±R6
AM2Instrument Panel J/B
W±R3
B±R
1
1
1
I11 Injector No.3
IG413
E8 E6
E6
E8 E6 E6
E6 E6
R±W B±R
B±R
B±R
B±R
B±R
B±R
B±RY R±B
L±R W
L G R
B±R B±R B±R
5
IG2
AM2
B±R
B±R
B±R
B±R
B±R
DI±190
± DIAGNOSTICSENGINE
384 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Refer to DTC P0351 on page DI±221 for the wiring diagram of the ignition system.
CONFIRMATION DRIVING PATTERN
(a) Connect the hand±held tester to the DLC3.
(b) Record DTC and the freeze frame data.
(c) Use the hand±held tester to set the check mode (See page DI±44).
(d) Read the value on the misfire counter for each cylinder when idling. If the value is displayed on the
misfire counter, skip the following procedure of confirmation driving.
(e) Drive the vehicle several times with the engine speed, load and surrounding range shown as ENGINE
SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the DATA LIST.
If you have no hand±held tester, turn the ignition switch OFF after the symptom is simulated once. Then re-
peat the simulation process again.

± DIAGNOSTICSENGINE
DI±191
385 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
In order to memorize the DTC of misfire, it is necessary to drive around MISFIRE RPM, MISFIRE LOAD in
the DATA LIST for the following period of time. Take care not to turn the ignition switch OFF. Turning the
ignition switch OFF switches the diagnosis system from check mode to normal mode, and all DTCs, etc.,
are erased.
Engine SpeedTime
Idling3 minutes 30 seconds or more
1,000 rpm3 minutes or more
2,000 rpm1 minute 30 seconds or more
3,000 rpm1 minute or more
(f) Check if there is misfire, and the DTC and the freeze frame data. Record the DTC's, freeze frame data
and misfire counter data.
(g) Turn the ignition switch OFF and wait for at least 5 seconds.
INSPECTION PROCEDURE
HINT:

If DTCs besides misfire DTCs are memorized simultaneously, troubleshoot the non±misfire DTCs first.

If the misfire does not occur when the vehicle is brought to the workshop, the misfire can be confirmed
by reproducing the condition of the freeze frame data. Also, after finishing the repair, confirm that there
is no misfire (See confirmation driving pattern).

On 6 or 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only
a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (P0301 to
P0308).
If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area,
only code P0300 may be stored.
When only a general misfire fault code like P0300 is stored:

Erase the general misfire fault code using the hand±held tester

Start the engine and drive the confirmation patten.

Read the value of the misfire ratio for each cylinder. Or read the DTC.

Repair the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC.

After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs.

When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data
is over the range of ±20 %, there is a possibility that the air±fuel ratio is becoming RICH (±20 % or
less) or LEAN (+20 % or more).

When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility of
misfire only during engine warm±up.

If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2)
improper fuel is being used, or 3) the ignition plug is contaminated.

Be sure to check the value on the misfire counter after the repair.

± DIAGNOSTICSENGINE
DI±277
471 Author: Date:
2005 SEQUOIA (RM1146U) 6. Second reference pressure measure-
ment
±
Next sequence is run if all of following
conditions setCondition 1, 2, 3 and 4
1. FTP when 4 sec. after reference pres-
sure measurement±±7.5 mmHg (±1 kPa)
2. Reference pressure±36.38 to ±7.93 mmHg (±4.85 to ±1.057 kPa)
3. Reference pressureSaturated
4. Reference pressure difference between
first and second±5.25 mmHg (0.7 kPa)
7. Leak check±
Next sequence is run if following condition
set±
FTP when vacuum introduction was com-
plete±Second reference pressure
8. Atmospheric pressure±
Monitor is complete if following±
Atmospheric pressure difference between
sequence 1 and 8±2.25 mmHg (0.3 kPa)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Small leak (0.020 inch) malfunction detection:
FTP when vacuum introduction was compleatBetween 1 and 2
Condition 1.Higher than second reference pressure
Condition 2.Lower than reference pressure x 0.2
Gross leak detection:
FTP when vacuum introduction was compleatHigher than reference pressure x 0.2
MONITOR RESULT (MODE 06 DATA)
Refer to page DI±26 for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page DI±460).

DI±372
± DIAGNOSTICSENGINE
566 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a) continues for 0.5 seconds or more:
(a) VPA
0.2 V or VPA  4.8 V
Accelerator pedal position sensor

ECM
P2122
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA
0.2 V
(b) VPA2  0.97 deg
Accelerator pedal position sensor

VCPA circuit open

VPA circuit open or ground short

ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA  4.8 V
Accelerator pedal position sensor

EPA circuit open

ECM
P2125
Condition (a) continues for 0.5 seconds or more:
(a) VPA2
0.5 V or VPA2  4.8 V and 0.2 V
VPA
3.45
V
Accelerator pedal position sensor

ECM
P2127
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA2
0.5 V
(b) VPA  0.97 deg
Accelerator pedal position sensor

VCP2 circuit open

VPA2 circuit open or ground short

ECM
P2128
Condition (a) and (b) continues for 2.0 seconds or more:
(a) VPA2  4.8 V
(a) 0.2 V
VPA
3.45 V
Accelerator pedal position sensor

EPA circuit open

ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) |VPA ± VPA2|
0.02 V
(b) VPA
0.2 V and VPA2
0.5 V
VPA and VPA2 circuit are short circuited

Accelerator pedal position sensor

ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand±held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble areaAccelerator pedal completely releasedAccelerator pedal fully depressedTrouble area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
E2 circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2 deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
When the voltage output of the VPA is below 0.2 V or exceeds 4.8 V.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail±safe operation will stop
and the system will return to normal condition.

DI±380
± DIAGNOSTICSENGINE
574 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºaccelerator pedal position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page DI±370.
DTC No.DTC Detecting ConditionTrouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFF
Accelerator pedal position sensor circuit

Accelerator pedal position sensor

ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements/signal outputs: VPA1 and VPA2. VPA1 is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. When
the difference between the voltage outputs of VPA1 and VPA2 deviates from the standard, the ECM con-
cludes the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is
set.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail±safe operation will stop
and the system will return to normal condition.
MONITOR STRATEGY
Related DTCsP2121Accelerator position sensor (rationality)
Required sensors/componentsAccelerator position sensor
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DID8H±01

± DIAGNOSTICSENGINE
DI±415
609 Author: Date:
2005 SEQUOIA (RM1146U) 4. Vacuum introduction and leak
±
Next sequence is run if both of following
conditions setCondition 1 and 2
1. Vacuum introduction time±15 min.
2. FTPFTP was saturated
5. Purge VSV stuck closed check±
Next sequence is run if following condition
set±
FTP change for 10 sec. after purge VSV
ON (open)2.25 mmHg (0.3 kPa)±
6. Second reference pressure measure-
ment±
Next sequence is run if all of following
conditions setCondition 1, 2, 3 and 4
1. FTP when 4 sec. after reference pres-
sure measurement±±7.5 mmHg (±1 kPa)
2. Reference pressure±36.38 to ±7.93 mmHg (±4.85 to ±1.057 kPa)
3. Reference pressureSaturated
4. Reference pressure difference between
first and second±5.25 mmHg (0.7 kPa)
7. Leak check±
Next sequence is run if following condition
set±
FTP when vacuum introduction was com-
plete±Second reference pressure
8. Atmospheric pressure±
Monitor is complete if following±
Atmospheric pressure difference between
sequence 1 and 8±2.25 mmHg (0.3 kPa)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Following values are when atmospheric pressure is 760
mmHg (100 kPa)±
One of the following conditions setCondition 1, 2, 3, 4 or 5
1. FTP when 4 sec. after reference pressure measurement
began±7.5 mmHg (±1 kPa) or more
2. Reference pressure±36.38 mmHg (±4.85 kPa) or less
3. Reference pressure±7.93 mmHg (±1.057 kPa) or more
4. Reference pressureNot saturated
5. Reference pressure difference between first and secondMore than 5.25 mmHg (0.7 kPa)
MONITOR RESULT (MODE 06 DATA)
Refer to page DI±26 for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page DI±460).

± DIAGNOSTICSENGINE
DI±421
615 Author: Date:
2005 SEQUOIA (RM1146U) 3. Reference pressure
Saturated
4. Reference pressure difference between
first and second±5.25 mmHg (0.7 kPa)
7. Leak check±
Next sequence is run if following condition
set±
FTP when vacuum introduction was com-
plete±Second reference pressure
8. Atmospheric pressure±
Monitor is complete if following±
Atmospheric pressure difference between
sequence 1 and 8±2.25 mmHg (0.3 kPa)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Vent valve stuck open:
Following valuers are when atmospheric pressure is 760
mmHg (100 kPa)±
One of the following conditions setCondition 1, 2, 3, 4 or 5
1. FTP when 4 sec. after reference pressure measurement
began±7.5 mmHg (±1 kPa) or more
2. Reference pressure±36.38 mmHg (±4.85 kPa) or less
3. Reference pressure±7.93 mmHg (±1.057 kPa) or more
4. Reference pressureNot saturated
5. Reference pressure difference between first and secondMore than 5.25 mmHg (0.7 kPa)
Vent valve stuck closed:
FTP change for 10 sec. after vent valve openedLess than 2.25 mmHg (0.3 kPa)
MONITOR RESULT (MODE 06 DATA)
Refer to page DI±26 for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page DI±460).

DI±450
± DIAGNOSTICSENGINE
644 Author: Date:
2005 SEQUOIA (RM1146U) Next sequence is run if both of following
conditions set
Condition 1 and 2
1. Vacuum introduction time±15 min.
2. FTPFTP was saturated
5. Purge VSV stuck closed check±
Next sequence is run if following condition
set±
FTP change for 10 sec. after purge VSV
ON (open)2.25 mmHg (0.3 kPa)±
6. Second reference pressure measure-
ment±
Next sequence is run if all of following
conditions setCondition 1, 2, 3 and 4
1. FTP when 4 sec. after reference pres-
sure measurement±±7.5 mmHg (±1 kPa)
2. Reference pressure±36.38 to ±7.93 mmHg (±4.85 to ±1.057 kPa)
3. Reference pressureSaturated
4. Reference pressure difference between
first and second±5.25 mmHg (0.7 kPa)
7. Leak check±
Next sequence is run if following condition
set±
FTP when vacuum introduction was com-
plete±Second reference pressure
8. Atmospheric pressure±
Monitor is complete if following±
Atmospheric pressure difference between
sequence 1 and 8±2.25 mmHg (0.3 kPa)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Following values are when atmospheric pressure is 760
mmHg (100 kPa)±
One of the following conditions is met±
FTP when 4 sec. after reference pressure measurement
beganMore than ±7.5 mmHg (±1 kPa)
Reference pressureLess than ±36.38 mmHg (±4.85 kPa)
Reference pressure±7.93 mmHg (±1.057 kPa) or more
Reference pressureNot saturated
Reference pressure difference between first and second5.3 mmHg (0.7 kPa) or more
MONITOR RESULT (MODE 06 DATA)
Refer to page DI±26 for detailed information on Monitor Result.
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page DI±460).

DIDIN±01
Vehicle Brought to Workshop
Customer Problem Analysis
Check DTC and Freeze Frame Data (Precheck)
Record or Print DTC and Freeze Frame Data DI±565
Clear DTC and Freeze Frame Data DI±565
Visual Inspection
Setting the Check Mode Diagnosis DI±566
1
Items insideare titles of pages in this manual, with the
page number indicated in the bottom portion. See the indicated
pages for detailed explanations.
DI±523
Connect a hand±held tester to DLC3.
If the display shows ºUNABLE TO CONNECT TO VEHICLEº when you have connected the
scan tool/hand±held tester, inspect DLC3 DI±562
2
3
4
5
6
Symptom does not occur
Problem Symptom Confirmation8
7Symptom Simulation
P.IN±24
Symptom occurs
DTC Check
DI±565OK Code
11Preliminary Check
DI±524
DTC Chart
DI±573
Mechanical System Test
DI±538 and DI±540
Manual Shifting Test
DI±542OK
OK
Chapter 1
(Electronic)Chapter 2
(On±Vehicle)
DI±553OKChapter 3
(Off±Vehicle)OK Matrix Chart of Problem Symptoms ± DI±553
Circuit
Inspection
NG
Parts Inspection
NG
NGNG
Identification of ProblemRepairConfirmation TestEnd
NG
NG
12
OK13
14
1516
17 9
10
DI±553DI±553
DI±576 to DI±691
18

O/D Main Switch Circuit Check

Shift Position L Switch Circuit Check DI±522
± DIAGNOSTICSAUTOMATIC TRANSMISSION
716 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING