2001 TOYOTA SEQUOIA engine

A2364720 msec./DIV 20 V/DIV
Ground
DI±36
± DIAGNOSTICSENGINE
230 Author: Date:
2005 SEQUOIA (RM1146U) OX2B (E7±33) ± E2 (E8±28)
R ± G±WIdlingPulse generation
(See waveform 10)
STP (E4 15) E1 (E6 1)GY BRBrake pedal is depressed7.5 to 14 VSTP (E4±15) ± E1 (E6±1)G±Y ± BRBrake pedal is releasedBelow 1.5 V
ST1 (E4 16) E1 (E6 1)LB BRBrake pedal is depressedBelow 1.5 VST1± (E4±16) ± E1 (E6±1)L±B ± BRBrake pedal is released7.5 to 14 V
STA (E6±11) ± E1 (E6±1)B±R ± BRShift lever position P or N, Ignition switch START6.0 V or more
STSW (E6±12) ± E1 (E6±1)B ± BRShift lever position P or N, ignition switch START6.0 V or more
STAR/NSW (E7 8) E1 (E6 1)BBRIG switch ON, Other shift position in P, N9 to 14 VSTAR/NSW (E7±8) ± E1 (E6±1)B ± BRIG switch ON, Shift position in P, N0 to 3.0 V
W (E5 30) E1 (E6 1)VW BRIdling9 to 14 VW (E5±30) ± E1 (E6±1)V±W ± BRIG switch ONBelow 3.0 V
TACH (E5±1) ± E1 (E6±1)Y±G ± BRIdlingPulse generation
(See waveform 11)
ACIS (E8±33) ± E1 (E6±1)B±L ± BRIG switch ON9 to 14 V
VPMP (E4±5) ± E1 (E6±1)P±L ± BRIgnition switch ON9 V to 14 V
MPMP (E4±6) ± E1 (E6±1)V±G ± BR
Vacuum pump OFF

Vacuum pump ON0 V to 3 V
9 V to 14 V
PPMP (E4±22) ± E1 (E6±1)R±G ± BRIgnition switch ON3 V to 3.6 V
AIV1 (E8±27) ± E1 (E6±1)L±B ± BRIgnition switch ON9 to 14 V
AIV2 (E8±26) ± E1 (E6±1)P±L ± BRIgnition switch ON9 to 14 V
AIRV (E4±4) ± E1 (E6±1)R±W ± BRIgnition switch ON9 to 14 V
AIRP (E4±25) ± E1 (E6±1)G±W ± BRIgnition switch ON9 to 14 V
AIP (E8±32) ± E1 (E6±1)B±Y ± BRIgnition switch ON3 V to 3.6 V
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
WAVEFORM 1
Fuel injector
ECM Terminal NamesBetween #10 (to 40) and E01
Tester Ranges20 V/DIV, 20 msec./DIV
ConditionsIdling
HINT:
The wavelength becomes shorter as the engine rpm increases.

A23648
GND 1V/ DIV KNK1 Signal Waveform
1 msec./ Division
A23649
200 msec./DIV 5 V/DIV
GroundA
B
A23650
20 msec./DIV 2 V/DIV
(a) Ground CH1
(b) Ground CH2
(c) Ground CH3
± DIAGNOSTICSENGINE
DI±37
231 Author: Date:
2005 SEQUOIA (RM1146U)
WAVEFORM 2
Knock sensor
ECM Terminal NameBetween KNK1 and EKNK
Between KNK2 and EKN2
Tester Range1 V/DIV, 1 msec./DIV
ConditionMaintain engine RPM at 2,000 rpm after engine warmed±up
HINT:

The wavelength becomes shorter as engine rpm in-
creases.

The waveforms and amplitudes displayed differ slightly
depending on the vehicle.
WAVEFORM 3
VVT OCV
ECM Terminal NameBetween OC1+ and OC1±
Between OC2+ and OC2±
Tester Range0.2 V/DIV, 200 msec./DIV
ConditionAccelerate slowly after engine warmed±up
HINT:
In the DATA LIST, the items VVT OCV DUTY B1 and B2 show
the duty ratio of voltage flowing to the OCV (see illustration on
left).
VVT OCV DUTY B1, B2 = A/B x 100 (%)
WAVEFORM 4
(a) VVT sensor bank 1
(b) VVT sensor bank 2
(c) Crankshaft position sensor
ECM Terminal Name
(a) Between VV1+ and VV1±
(b) Between VV2+ and VV2±
(c) Between NE+ and NE±
Tester Range2 V/DIV, 20 msec./DIV
ConditionIdle after engine warmed±up
HINT:
The wavelength becomes shorter as the engine rpm increases.

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.

A23656
0.2 V/DIV
200 msec./DIV
Ground
A2365710 msec./DIV 5 V/DIV
Ground
± DIAGNOSTICSENGINE
DI±39
233 Author: Date:
2005 SEQUOIA (RM1146U)
WAVEFORM 10
Heated oxygen sensor
ECM Terminal NamesBetween OX1B and E2
Tester Ranges0.2 V/DIV, 200 msec./DIV
ConditionsEngine speed maintained 2,500 rpm for 2 minutes after
warming up sensor
HINT:
In the DATA LIST, item O2S B1S2 shows the ECM input values
from the heated oxygen sensor.
WAVEFORM 11
Engine speed signal
ECM Terminal NamesBetween TACH and E1
Tester Ranges5 V/DIV, 10 msec./DIV
ConditionsIdling
HINT:
The wavelength becomes shorter as vehicle speed increases.

DID7X±01
FI0534
D13872
Hand±Held Tester
DLC3
DI±40
± DIAGNOSTICSENGINE
234 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. Description

When troubleshooting On±Board Diagnostic (OBD ll) ve-
hicles, the vehicle must be connected to the hand±held
tester. Various data output from the vehicle's ECM can
then be read.

OBD ll regulations require that the vehicle's on±board
computer illuminates the Malfunction Indicator Light (MIL)
on the instrument panel when the computer detects a
malfunction in: 1) the emission control system/compo-
nents, or 2) the powertrain control components (which af-
fect vehicle emissions), or 3) the computer. In addition,
the applicable Diagnostic Trouble Codes (DTCs) pre-
scribed by SAE J2012 are recorded in the ECM memory
(See page DI±58).
If the malfunction does not reoccur in 3 consecutive trips, the
MIL goes off automatically but the DTCs remain recorded in the
ECM memory.
To check the DTC, connect the hand±held tester or OBD II scan
tool to the Data Link Connector 3 (DLC3) of the vehicle. The
hand±held tester or OBD II scan tool also enables you to erase
the DTC and check the freeze frame data and various forms of
engine data (See the instruction manual for the hand±held tes-
ter). The DTC includes SAE controlled codes and manufacturer
controlled codes. SAE controlled codes must be set according
to the SAE, while manufacturer controlled codes can be set by
a manufacturer with certain restrictions (See the DTC chart on
page DI±58).
2. NORMAL MODE AND CHECK MODE
The diagnosis system operates in ºnormal modeº during normal
vehicle use. In ºnormal modeº, 2 trip detection logic* is used to
ensure accurate detection of malfunctions. A ºcheck modeº is
also available to technicians as an option. In ºcheck modeº, 1
trip detection logic is used for simulating malfunction symptoms
and increasing the system's ability to detect malfunctions, in-
cluding intermittent malfunctions (See page DI±11).
3. 2±TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is tempo-
rarily stored in the ECM memory. This is known as 1st trip detec-
tion. If the ignition switch is turned OFF and then ON again, and
the same malfunction is detected again, the MIL will illuminate.
This is known as 2nd trip detection.

A04550
12 345678
11 12 13 14 15 16 910
DLC3
± DIAGNOSTICSENGINE
DI±41
235 Author: Date:
2005 SEQUOIA (RM1146U)

Freeze frame data:
The freeze frame data records the engine conditions (fuel
system, calculated load, engine coolant temperature, fuel
trim, engine speed, vehicle speed, etc.) when a malfunc-
tion is detected. When troubleshooting, freeze frame data
can help determine if the vehicle was running or stopped,
if the engine was warmed up or not, if the air±fuel ratio
was lean or rich, as well as other data from the time when
a malfunction occurred.
Priorities for troubleshooting:
When multiple DTCs occur, find out the order in which the DTCs
should be inspected by checking the component's DTC chart.
If no instructions are written in the DTC chart, check DTCs in the
following order of priority:
(a) DTCs other than fuel trim malfunction DTCs (P0171,
P0172, P0174 and P0175) and misfire DTCs (P0300 to
P0308).
(b) Fuel trim malfunction DTCs (P0171, P0172, P0174 and
P0175).
(c) Misfire DTCs (P0300 to P0308).
4. CHECK DLC3
The vehicle's ECM uses the ISO 9141±2 for communica-
tion protocol. The terminal arrangement of the DLC3 com-
plies with SAE J1962 and matches the ISO 9141±2 for-
mat.
SymbolTerminal DescriptionConditionSpecified Condition
SIL (7) ± SG (5)Bus º+º lineDuring transmissionPulse generation
CG (4) ± Body groundChassis groundAlwaysBelow 1 W
SG (5) ± Body groundSignal groundAlwaysBelow 1 W
BAT (16) ± Body groundBattery positiveAlways11 to 14 V
CANH (6) ± CANL (14)HIGH±level CAN bus lineIgnition switch OFF54 to 69 W
CANH (6) ± Battery positiveHIGH±level CAN bus lineIgnition switch OFF1 MW or higher
CANH (6) ± CG (4)HIGH±level CAN bus lineIgnition switch OFF1 kW or higher
CANL (14) ± Battery positiveLOW±level CAN bus lineIgnition switch OFF1 MW or higher
CANL (6) ± CG (4)LOW±level CAN bus lineIgnition switch OFF1 kW or higher
HINT:
Connect the cable of the hand±held tester to the DLC3, turn the
ignition switch ON and attempt to use the hand±held tester. If
the screen displays UNABLE TO CONNECT TO VEHICLE, a
problem exists in the vehicle side or the tester side.

If the communication is normal when the tool is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.

DI±42
± DIAGNOSTICSENGINE
236 Author: Date:
2005 SEQUOIA (RM1146U)

If the communication is still impossible when the tool is
connected to another vehicle, the problem is probably in
the tool itself, so consult the Service Department listed in
the tool's instruction manual.
5. INSPECT BATTERY VOLTAGE
Battery Voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
6. CHECK MIL
(a) The MIL comes on when the ignition switch is turned ON
and the engine is not running.
HINT:
If the MIL is not illuminated, troubleshoot the MIL circuit (See
page DI±512).
(b) When the engine is started, the MIL should not illuminate.
If the lamp remains on, the diagnosis system has de-
tected a malfunction or abnormality in the system.
7. ALL READINESS
For this vehicle, using the hand±held tester allows readiness
codes corresponding to all DTCs to be read. When diagnosis
(normal or malfunctioning) has been complete, readiness
codes are set. Enter the following menus: ENHANCED OBD II
/ MONITOR STATUS on the hand±held tester.

DID7Y±01
D13872
Hand±Held Tester
DLC3CAN VIM
± DIAGNOSTICSENGINE
DI±43
237 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. CHECK DTC
DTCs which are stored in the ECM can be displayed with the
hand±held tester or generic OBD II scan tool.
These scan tools can display pending DTCs and current DTCs.
Some DTCs are not stored if the ECM does not detect a mal-
function during consecutive driving. However, the detected
malfunction during once driving is stored as pending DTC.
(a) Connect the hand±held tester to the CAN VIM. Then con-
nect the CAN VIM to the Data Link Connector 3 (DLC3).
(b) Turn the ignition switch to ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES (or PENDING
CODE).
(d) Confirm the DTCs and freeze frame data and then write
them down.
(e) See page DI±58 to confirm the details of the DTCs.
NOTICE:
When simulating a symptom with the hand±held tester to
check the DTCs, use the normal mode. For DTC chart sub-
ject to º2 trip detection logicº, perform either of the follow-
ing actions.
Turn the ignition switch OFF after the symptom is simulated
once. Then repeat the simulation process again. When the
problem has been simulated twice, the MIL illuminates and the
DTCs are recorded in the ECM.
2. CLEAR DTC
(a) Connect the hand±held tester to the CAN VIM. Then con-
nect the CAN VIM to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CLEAR CODES and press YES.