2001 TOYOTA SEQUOIA Service Repair Manual

air bleeding engine oil tire size catalytic converter height adjustment remote start

Page 361 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17394
Fuel
Compensation
Amount
1.35
1.0
0.65 +35 (%):
Lean Malfunction Threshold
±35 (%):
Rich Malfunction Threshold
P0171, P0174:
P0172, P0175:
± DIAGNOSTICSENGINE
DI±167
361 Author: Date:
200

Page 362 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±168
± DIAGNOSTICSENGINE
362 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page

DI±168
± DIAGNOSTICSENGINE
362 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Battery voltage11 V±
Fuel system statusClosed±loop
Throttle position learningCompleted
Either of the following conditions is met:Condition 1 or 2
1. Engine RPM±1,000 rpm
2. Intake air amount per revolution0.26 g/sec.±
Catalyst monitorNo executed
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Purge±cutExecuting
Either of the following conditions is metCondition 1 or 2
1. Average between short±term fuel trim and long±term fuel
trim35% or more (varies with ECT)
2. Average between short±term fuel trim and long±term fuel
trim±35% or less (varies with ECT)
WIRING DIAGRAM
Refer to DTC P2195 on page DI±383.
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air±Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using a hand±held tester.
(1) Connect a hand±held tester to the DLC3.
(2) Start the engine and turn the tester ON.
(3) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
(4) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT
or LEFT button to change the fuel injection volume).
(6) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 (AFS B2S1) and OS2 B1S2
(O2S B2S2)) displayed on the tester.
HINT:
The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection
volume by 25 %.
Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Page 363 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual +25 %
±12.5 %
More than 3.35 V
Less than 3.0 V
1
A/F Sensor (Sensor 1)
Output Voltage
Injection volume
Output voltage
HO2 Sensor (Sensor 2)
Output VoltageMain Suspected
Trouble Areas
OK
+25 %
±12

Page 364 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±170
± DIAGNOSTICSENGINE
364 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
Read freeze frame data using a hand±held tester. Freeze frame data record the engine condition when
malfunctions are

Page 365 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±171
365 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check air induction system (See page SF±1).
CHECK:
Check the air induction system for vacuum leaks.
NG Repair or replace ai

Page 366 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±172
± DIAGNOSTICSENGINE
366 Author: Date:
2005 SEQUOIA (RM1146U)Rich
RichActual air±fuel ratio rich
Injector leakage or blockage
Gas leakage from exhaust system
Ignition system
Fuel pre

Page 367 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±173
367 Author: Date:
2005 SEQUOIA (RM1146U)
6 Read value of mass air flow meter.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch

Page 368 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17396
HT +B
AF± AF+ Sensor 1A/F Sensor Component Side:
Front View
DI±174
± DIAGNOSTICSENGINE
368 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check for spark and ignition (See page IG±1).
HINT:
If

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