2001 TOYOTA SEQUOIA Service Repair Manual

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Page 345 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±151
345 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
P0136
Heated rear oxygen sensor (Bank 1) output volt-
age (Output voltage)
P0136Heated rear oxygen sensor (Ba

± DIAGNOSTICSENGINE
DI±151
345 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
P0136
Heated rear oxygen sensor (Bank 1) output volt-
age (Output voltage)
P0136Heated rear oxygen sensor (Bank 1) impedance
(Low)
P0137
Heated rear oxygen sensor (Bank 1) output volt-
age (Low voltage)
P0137Heated rear oxygen sensor (Bank 1) impedance
(High)
P0138
Heated rear oxygen sensor (Bank 1) output volt-
age (High voltage)
RltdDTC
P0138Heated rear oxygen sensor (Bank 1) output volt-
age (Extremely high)
Related DTCs
P0156
Heated rear oxygen sensor (Bank 2) output volt-
age (Output voltage)
P0156Heated rear oxygen sensor (Bank 2) impedance
(Low)
P0157
Heated rear oxygen sensor (Bank 2) output volt-
age (Low voltage)
P0157Heated rear oxygen sensor (Bank 2) impedance
(High)
P0158
Heated rear oxygen sensor (Bank 2) output volt-
age (High voltage)
P0158Heated rear oxygen sensor (Bank 2) output volt-
age (Extremely high)
Rid / tMain sensors/componentsHeated rear oxygen sensorRequired sensors/componentsRelated sensors/componentsMass air flow meter
Frequency of operationOnce per driving cycle: Active air±fuel ratio control detection
Continuous: Others
Duration
20 sec.: Heated oxygen sensor output (Output voltage, High voltage, Low voltage)
30 sec.: Heated oxygen sensor impedance (Low)
90 sec.: Heated oxygen sensor impedance (High)
10 sec.: Heated oxygen sensor impedance (Extremely high)
MIL operation2 driving cycles Heated oxygen sensor output (Output voltage, High voltage, Low voltage)
Immediate: Heated oxygen sensor impedance (Low, High, Extremely high)
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Heated oxygen sensor output voltage (Output voltage, High voltage and Low voltage):
Active air±fuel ratio controlExecuting
Active air±fuel ratio control being when all
of following conditions met±
Battery voltage11 V±
Engine coolant temperature75°C (167°F)±
IdleOFF
Engine RPM±3,200 rpm

Page 346 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±152
± DIAGNOSTICSENGINE
346 Author: Date:
2005 SEQUOIA (RM1146U) A/F sensor status
Activated
Fuel±cutOFF
Engine load10 to 70%
Shift position4th±
Heated oxygen sensor impedance (Low):
Batter

Page 347 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±153
347 Author: Date:
2005 SEQUOIA (RM1146U) Heated oxygen sensor impedance
348.1 MW or more
Heated oxygen sensor output voltage (Extremely high):
Duration of following co

Page 348 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23661
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 if vehicle stops during driving pattern, test can be resumed)NOTICE

A23661
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 if vehicle stops during driving pattern, test can be resumed)NOTICE:
This test will not be completed
if the vehicle is driven under
absolutely constant speed
conditions such as with cruise
control activated. (h)
(g)
MISFIRE MON ..................... AVAILREADINESS TESTS
CAT EVAL ......................... INCMPL
HTD CAT EVAL ...................... N/A
EVAP EVAL ....................... INCMPL
2nd AIR EVAL .......................... N/A
A/C EVAL ................................ N/A
O2S EVAL ........................ INCMPL
O2S HTR EVAL .................. INCMPL
EGR EVAL ...............................N/A COMP MON ........................ AVAIL FUEL SYS MON ................... AVAIL
A76855
A23660
DI±154
± DIAGNOSTICSENGINE
348 Author: Date:
2005 SEQUOIA (RM1146U)
CONFIRMATION DRIVING PATTER
HINT:
This confirmation driving pattern is used in steps 5, 8 and 11 of the following diagnostic troubleshooting
procedure when using either a hand±held tester.
Performing this confirmation pattern will activate the Heated Oxygen (HO2) sensor monitor. (The cata-
lyst monitor is performed simultaneously.) This is very useful for verifying the completion of a repair.
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester or scan tool ON.
(d) Clear DTCs (where set) (see page DI±43).
(e) If using a hand±held tester, select the following menu
items: DIAGNOSIS / CARB OBD II / READINESS
TESTS.
(f) Check that O2S EVAL is INCMPL (incomplete).
(g) Start the engine and warm it up.
(h) Drive the vehicle at between 40 mph and 70 mph (64 km/h
and 113 km/h) for at least 10 minutes.
(i) Note the state of the Readiness Tests items. Those items
will change to COMPL (complete) as O2S EVAL monitor
operates.
(j) On the tester, select the following menu items: DIAGNO-
SIS / ENHANCED OBD II / DTC INFO / PENDING
CODES and check if any DTCs (any pending DTCs) are
set.
HINT:
If O2S EVAL does not change to COMPL, and any pending
DTCs fail to set, extend the driving time.

Page 349 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±155
349 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Narrowing down the trouble area is possible by performing ACTIVE TEST of t

Page 350 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual +25 %
±12.5 %
More than 0.5 V
Less than 0.4 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
senso

Page 351 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±157
351 Author: Date:
2005 SEQUOIA (RM1146U)
1 Read output DTC.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the h

Page 352 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17416HT1BECM Connector
E7OX1B E8
HT2B
OX2B
A21341
+B
OX E1HT
H2
H4
Components Side:
Bank 1 Sensor 2, Bank 2 Sensor 2
DI±158
± DIAGNOSTICSENGINE
352 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check

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