TOYOTA SEQUOIA 2001 Service Repair Manual

DICEL±02
± DIAGNOSTICSENGINE
DI±27
221 Author: Date:
2005 SEQUOIA (RM1146U)
READINESS MONITOR DRIVE PATTERN
1. PURPOSE OF THE READINESS TESTS

The On±Board Diagnostic (OBD II) system is designed to monitor the performance of emission±re-
lated components and report any detected abnormalities in the form of Diagnostic Trouble Codes
(DTCs). Since the various components need to be monitored during different driving conditions, the
OBD II system is designed to run separate monitoring programs called Readiness Monitors. Many
state Inspection and Maintenance (I/M) programs require that vehicles complete their Readiness Mon-
itors prior to beginning an emission test.

The current status of the Readiness Monitors can be seen by using the hand±held tester with version
9.0 software (or newer), or a generic OBD II Scan tool.

To view the Readiness Monitor status using the hand±held tester, select ºMonitor Statusº from the En-
hanced OBD II Menu.

A status of ºcompleteº indicates that the necessary conditions have been met to run the performance
tests for the related Readiness Monitor.

The Readiness Monitor will be reset to ºincompleteº if:

ECM has lost power (battery or fuse).

DTCs have been cleared.

The conditions for running the Readiness Monitor have not been met.

In the event that any Readiness Monitor shows ºincomplete,º follow the appropriate Readiness Monitor
Drive Pattern to activate the monitor and change the readiness status to ºcomplete.º
CAUTION:
Strictly observe the posted speed limits, traffic laws, and road conditions when performing these
drive patterns.
NOTICE:
These drive patterns represent the fastest method to satisfy all necessary conditions which allow
the specific readiness monitor to complete.
In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other fac-
tors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to ºcom-
pleteº.
To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed
(driving up and down hills and/or sudden acceleration).
Contents:
TITLESTEP(s)
CATALYST MONITOR2
EVAP MONITOR3, 4
AIR±FUEL RATIO (A/F) AND OXYGEN SENSOR (O2S) MONITOR5
OXYGEN SENOSR HEATER MONITOR6

A23510
Vehicle Speed
(64 km/h and 113 km/h)Between
40 mph and 70 mph
Idling
Ignition Switch OFF
10 minutes
Time Warm up
(Note: Even when vehicle stops during driving pattern, test can be resumed)NOTICE:
This test will not be completed
if the vehicle is driven under
absolute constant speed
condition such as with cruise
control activated. (6)
(5) DI±28
± DIAGNOSTICSENGINE
222 Author: Date:
2005 SEQUOIA (RM1146U)
2. CATALYST MONITOR (ACTIVE AIR±FUEL RATIO CONTROL TYPE)
(a) Preconditions
The monitor will not run unless:

The MIL is OFF
(b) Drive Pattern
(1) Connect a hand±held tester or OBD II scan tool to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the tester or scan tool ON.
(4) Clear DTCs (where set) (see page DI±43).
(5) Start the engine and warm it up.
(6) Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes.
(c) Monitor Status
(1) Check the Readiness Monitor status displayed on the tester or scan tool.
(2) If the status does not switch to COMPL (complete), extend the driving time.

A18910
Idling
Ignition OFF
Warmed up Soak 15 to 50 min.
(When the readiness code or diagnostic code
is set, this test is completed.) 3,000 rpm
10 sec.
± DIAGNOSTICSENGINE
DI±29
223 Author: Date:
2005 SEQUOIA (RM1146U)
3. EVAP MONITOR (VACUUM PRESSURE MONITOR)
NOTICE:
A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pres-
sure Readiness Monitor.
(a) Cold Soak Preconditions
The monitor will not run unless:

MIL is OFF

Fuel level is approximately 1/2 to 3/4

Altitude is 7,800 feet (2,400 m) or less
(b) Cold Soak Procedure
Let the vehicle cold soak for 8 hours or until the difference between IAT and ECT becomes less than
7°C (13°F)
HINT:
Examples:

Scenario 1
ECT = 24°C (75°F)
IAT = 16°C (60°F)
Difference between ECT and IAT is 8°C (15°F)
" The monitor will not run because difference between ECT and IAT is greater than 7°C (13°F)

Scenario 2
ECT = 21°C (70°F)
IAT = 20°C (68°F)
Difference between ECT and IAT is 1°C (2°F)
" The monitor will run because difference between ECT and IAT is less than 7°C (13°F)
4. EVAP MONITOR (VACUUM PRESSURE MONITOR) (CONTINUED)

DI±30
± DIAGNOSTICSENGINE
224 Author: Date:
2005 SEQUOIA (RM1146U)
(a) Preconditions
The monitor will not run unless:

MIL is OFF

Fuel level is approximately 1/2 to 3/4

Altitude is 7,800 feet (2,400 m) or less

Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F)

Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)

Cold Soak Procedure has been completed

Before starting the engine, the difference between ECT and IAT must be less than 7°C (13°F)
HINT:
Examples:

Scenario 1
ECT = 24°C (75°F)
IAT = 16°C (60°F)
Difference between ECT and IAT is 8°C (15°F)
" The monitor will not run because difference between ECT and IAT is higher than 7°C (13°F)

Scenario 2
ECT = 21°C (70°F)
IAT = 20°C (68°F)
Difference between ECT and IAT is 1°C (2°F)
" The monitor will run because difference between ECT and IAT is less than 7°C (13°F)
The readiness test can be completed in cold ambient conditions (less than 40°F / 4.4°C) and/or at
high altitudes (more than 7,800 feet / 2,400 m) if the drive pattern is repeated a second time after cycl-
ing the ignition off.
(b) Drive Pattern
(1) Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to (a)).
(2) Release pressure in fuel tank by removing the fuel tank cap and then reinstall it.
(3) Start the engine and allow it to idle until ECT becomes 75°C (167°F) or higher.
(4) Run the engine at 3,000 rpm for approximately 10 seconds.
(5) Allow the engine to idle with the A/C ON (to create slight load) for 15 to 50 minutes.
NOTICE:
If the vehicle is not equipped with A/C, put a slight load on the engine by doing the following :

Securely set the parking brake.

Block the drive wheels with wheel chocks.

Allow the vehicle to idle in drive for 15 to 50 minutes.

A23544
40 mph (64 km/h)
Idling
IG SW OFF ECT:
75C (167F) or higher
Vehicle Speed
Warming up(5)(6)
10 minutes
or more(7)
10 seconds
or more4 seconds
or moreTime At Least 3 times
(8) (9)
(10) Accelerator Pedal
DepressedAccelerator Pedal
Released (Fuel±cut)
± DIAGNOSTICSENGINE
DI±31
225 Author: Date:
2005 SEQUOIA (RM1146U)
5. AIR±FUEL RATIO (A/F) AND OXYGEN SENSOR (HO2) MONITOR (ACTIVE AIR±FUEL RATIO
CONTROL TYPE)
(a) Preconditions
The monitor will not run unless:

2 minutes or more have elapsed since the engine was started.

The Engine Coolant Temperature (ECT) is 75C (167F) or higher.

Air±fuel ratio feedback control is performed.

Fuel±cut control is performed for 8 seconds or more.
(b) Drive Pattern
(1) Connect the hand±held tester to DLC3.
(2) Turn the ignition switch to ON.
(3) Clear DTCs (see page DI±43).
(4) Start the engine, and warm it up until the ECT reaches 75C (167F) or higher.
(5) Drive the vehicle at 40 mph (64 km/h) or more for at least 10 minutes.
(6) Change the transmission to 2nd gear.
(7) Accelerate the vehicle to 30 mph (48 km/h) or more by depressing the accelerator pedal for at
least 10 seconds.
(8) Soon after performing step (8) above, release the accelerator pedal for at least 4 seconds without
depressing the brake pedal, in order to execute fuel±cut control.
(9) Stop the vehicle and allow the engine to idle for 10 seconds or more.
(10) Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h).
(11) Repeat steps from (8) through (10) above at least 3 times in one driving cycle.
(c) Monitor Status
(1) Check the Readiness Monitor status displayed on the tester.
(2) If the status does not switch to COMPL (complete), make sure that the preconditions have been
met, and then perform steps from (5) through (11) in Drive Pattern above.

A18915
Idling
Ignition OFF(40 km/h)25 mph
Over 2 minutes Over 500 seconds DI±32
± DIAGNOSTICSENGINE
226 Author: Date:
2005 SEQUOIA (RM1146U)
6. OXYGEN SENSOR HEATER MONITOR
(a) Preconditions
The monitor will not run unless:

MIL is OFF
(b) Drive Pattern
(1) Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to
(a)).
(2) Start the engine and allow it to idle for 500 seconds or more.
(3) Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes.
(4) Check the status of the readiness monitor on the scan tool display. If readiness status did not
switch to complete, ensure the preconditions are met, turn the ignition off and then repeat steps
(2) and (3).

DI3HJ±10
± DIAGNOSTICSENGINE
DI±33
227 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)
22.Starter
23.Starter relay
24.Park/neutral position switchST±15
ST±17
DI±576
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI±493
DI±509
IN±35
No complete combustion (Does not start)1. Fuel pump control circuitDI±509
Engine cranks normally but difficult to start
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI±298
DI±509
EM±3
Difficult to start with cold engine1. Starter signal circuit
2. Fuel pump control circuitDI±298
DI±509
Difficult to start with hot engine1. Starter signal circuit
2. Fuel pump control circuitDI±298
DI±509
High engine idle speed (Poor idling)1. A/C switch circuit
2. ECM power source circuit±
DI±493
Low engine idle speed (Poor idling)1. A/C switch circuit
2. Fuel pump control circuit±
DI±509
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM±3
DI±509
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI±493
DI±509
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI±509
±
Surging (Poor driveability)1. Fuel pump control circuitDI±509
Engine stalls soon after starting1. Fuel pump control circuitDI±509
Engine stalls during A/C operation1. A/C switch circuit
2. Engine control module (ECM)±
IN±35
Unable to refuel/Difficult to refuel1. ORVR system±

DIDFO±01
B17410
E5 E6
E7 E8E4 DI±34
± DIAGNOSTICSENGINE
228 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECM
Each ECM terminals' standard voltage is shown in the table below. In the table, first follow the information
under ºConditionº.
Look under ºSymbols (Terminals No.)º for the terminals to be inspected.
The standard voltage between the terminals is shown under ºSTD Voltageº.
Use the illustration above as a reference for the ECM terminals.
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage
BATT (E4±3) ± E1 (E6±1)B±Y ± BRAl9t 14V+BM (E4±7) ± E1 (E6±1)W±G ± BRAlways9 to 14 V
IGSW (E4±9) ± E1 (E6±1)B±O ± BR
+B (E4±1) ± E1 (E6±1)B±R ± BRIG switch ON9 to 14 V
+B2 (E4±2) ± E1 (E6±1)B±R ± BR
IG switch ON9 to 14 V
MREL (E4±8) ± E1 (E6±1)B±W ± BRIG switch ON9 to 14 V
VC (E8±23) ± E2 (E8±28)G±B ± G±WIG switch ON4.5 to 5.5 V
VG (E8±30) ± E2G (E8±29)R±W ± B±WIdling, P or N position, A/C switch OFF0.5 to 3.0 V
THA (E8±22) ± E2 (E8±28)Y±G ± G±WIdling, Intake air temp. 20°C (68°F)0.5 to 3.4 V
THW (E8±21) ± E2 (E8±28)G±Y ± G±WIdling, Engine coolant temp. 80°C (176°F)0.2 to 1.0 V
VTA1 (E8 20) E2 (E8 28)BY GWIG switch ON, Accelerator pedal released0.5 to 1.2 VVTA1 (E8±20) ± E2 (E8±28)B±Y ± G±WIG switch ON, Accelerator pedal depressed3.2 to 4.8 V
VTA2 (E8 19) E2 (E8 28)PL GWIG switch ON, Accelerator pedal released2.0 to 3.1 VVTA2 (E8±19) ± E2 (E8±28)P±L ± G±WIG switch ON, Accelerator pedal depressed4.7 to 5.1 V
VPA (E4 18) E2 (E8 28)GR GWIG switch ON, Accelerator pedal released0.3 to 0.9 VVPA (E4±18) ± E2 (E8±28)G±R ± G±WIG switch ON, Accelerator pedal depressed3.2 to 4.8 V
VPA2 (E4 19) E2 (E8 28)LY GWIG switch ON, Accelerator pedal released1.8 to 2.7 VVPA2 (E4±19) ± E2 (E8±28)L±Y ± G±WIG switch ON, Accelerator pedal depressed4.7 to 5.1 V
VCPA (E4±26) ± EPA (E4±20)G±B ± G±WIG switch ON4.5 to 5.5 V
VCP2 (E4±27) ± EPA2 (E4±21)L±R ± L±BIG switch ON4.5 to 5.5 V

± DIAGNOSTICSENGINE
DI±35
229 Author: Date:
2005 SEQUOIA (RM1146U) #10 (E6±2) ± E01 (E8±7)
#20 (E6±3) ± E01 (E8±7)
#30 (E6±4) ± E01 (E8±7)
#40 (E6 5) E01 (E8 7)
R ± W±B
W ± W±B
G ± W±B
RB WB
IG switch ON9 to 14 V
#40 (E6±5) ± E01 (E8±7)
#50 (E6±6) ± E01 (E8±7)
#60 (E6±7) ± E01 (E8±7)
#70 (E8±3) ± E01 (E8±7)
#80 (E8±2) ± E01 (E8±7)R±B ± W±B
L ± W±B
Y ± W±B
L±R ± W±B
R±W ± W±B
IdlingPulse generation
(See waveform 1)
KNK1 (E7±29) ± EKNK (E7±28)G ± RMiti i d t4000 ft iPulse generation
KNK2 (E7±21) ± EKN2 (E7±20)W ± BMaintain engine speed at 4,000 rpm after warming upPulse generation
(See waveform 2)
OC1+ (E6±17) ± OC1± (E6±16)L±W ± P±LAccelerate slowly after engine warmed±upPulse generation
(See waveform 3)
OC2+ (E6±15) ± OC2± (E6±14)L±B ± R±LAccelerate slowly after engine warmed±upPulse generation
(See waveform 3)
VV1+ (E6±25) ± VV1± (E6±24)R ± WIdlingPulse generation
(See waveform 4)
VV2+ (E6±18) ± VV2± (E6±28)G ± RIdlingPulse generation
(See waveform 4)
G2+ (E6±19) ± G2± (E6±29)Y ± LIdlingPulse generation
(See waveform 5)
NE+ (E6±21) ± NE± (E6±20)R ± GIdlingPulse generation
(See waveform 5)
PRG (E8±34) ± E1 (E6±1)W±G ± BRIG switch ON9 to 14 V
SPD (E5±8) ± E1 (E6±1)G±O ± BRIG switch ON, Rotate driving wheel slowlyPulse generation
(See waveform 6)
M+ (E8±5) ± E1 (E6±1)V ± BRIdlingPulse generation
(See waveform 7)
M± (E8±4) ± E1 (E6±1)P ± BRIdlingPulse generation
(See waveform 8)
FPR (E6±30) ± E1 (E6±1)V ± BRIG switch ON0 to 3.0 V
FC (E4±10) ± E1 (E6±1)G±O ± BRIG switch ON9 to 14 V
IGT1 (E8±8) ± E1 (E6±1)
IGT2 (E8±15) ± E1 (E6±1)
IGT3 (E8±11) ± E1 (E6±1)
IGT4 (E8±10) ± E1 (E6±1)
IGT5 (E8±13) ± E1 (E6±1)
IGT6 (E8±12) ± E1 (E6±1)
IGT7 (E8±14) ± E1 (E6±1)
IGT8 (E8±9) ± E1 (E6±1)B±L ± BR
LG±B ± BR
G±B ± BR
R±W ± BR
G±W ± BR
P±L ± BR
G±R ± BR
LG ± BR
IdlingPulse generation
(See waveform 9)
IGF1 (E8 24) E1 (E6 1)BR BRIG switch ON4.5 to 5.5 VIGF1 (E8±24) ± E1 (E6±1)
IGF2 (E8±25) ± E1 (E6±1)B±R ± BR
B±W ± BR
IdlingPulse generation
(See waveform 9)
A1A+ (E7±22) ± E1 (E6±1)G ± BRAlways (Ignition switch ON)3.3 V*1
A1A± (E7±30) ± E1 (E6±1)R ± BRAlways (Ignition switch ON)3.0 V*1
A2A+ (E7±23) ± E1 (E6±1)W ± BRAlways (Ignition switch ON)3.3 V*1
A2A± (E7±31) ± E1 (E6±1)B ± BRAlways (Ignition switch ON)3.0 V*1
HT1B (E8±1) ± E1 (E6±1)W±R ± BRIdlingBelow 3.0 VHT1B (E8 1) E1 (E6 1)
HT2B (E7±5) ± E1 (E6±1)
WR BR
Y ± BRIG switch ON9 to 14 V
OX1B (E8±18) ± E2 (E8±28)G ± G±WIdlingPulse generation
(See waveform 10)

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.