Introduction: Overview Toyota Sequoia I рестайлинг

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1. GENERAL DESCRIPTION At the beginning of each article, a General Description that pertains to all repair operations contained in that section is given. Read these precautions before starting any repair task.
2. TROUBLESHOOTING TROUBLESHOOTING tables are included for each system to help you diagnose the problem and find the cause. The fundamentals of how to proceed with troubleshooting are described on «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-227563-S09575143742006040600000). Be sure to read this before performing troubleshooting.
3. PREPARATION Preparation lists the SST (Special Service Tools), recommended tools, equipment, lubricant and SSM (Special Service Materials) which should be prepared before beginning the operation and explains the purpose of each one.
4. REPAIR PROCEDURES Most repair operations begin with an overview illustration. It identifies the components and shows how the parts fit together. Example: The procedures are presented in a step-by-step format: The illustration shows what to do and where to do. The task heading tells what to do. The detailed text tells how to perform the task and gives other information such as specifications and warnings. Example: This format provides the experienced technician with a FAST TRACK to the information needed. The upper case task heading can be read at a glance when necessary, and the text below it provides detailed information. Important specifications and warnings always stand out in bold type.
5. REFERENCES References have been kept to a minimum. However, when they are required, you are given a link to guide you.
6. SPECIFICATIONS Specifications are presented in bold type throughout the text where needed. You never have to leave the procedure to look up your specifications. They are also found in Service Specifications article for quick reference.
7. CAUTIONS, NOTICES, HINTS: CAUTIONS are presented in bold type, and indicate there is a possibility of injury to you or other people. NOTICES are also presented in bold type, and indicate the possibility of damage to the components being repaired. HINTS are separated from the text but do not appear in bold. They provide additional information to help you perform the repair efficiently.
8. SI UNIT The UNITS given in this information are primarily expressed according to the SI UNIT (International System of Unit), and alternately expressed in the metric system and in the English System. Example: Torque: 30 N.m (310 kgf.cm, 22 ft.lbf)

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1. VEHICLE IDENTIFICATION NUMBER The vehicle identification number is stamped on the vehicle identification number plate and certification label. A: Vehicle Identification Number Plate B: Certification Label
2. ENGINE SERIAL NUMBER The engine serial number is stamped on the engine block, as shown in the illustration.

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1. Prevent damage and maintain vehicle cleanliness by protective covering on the fender, seat and floor.
2. During disassembly, keep parts in the appropriate order to facilitate reassembly.
3. Installation and removal of battery terminal: Before performing electrical work, disconnect the negative (-) terminal cable from the battery. If it is necessary to disconnect the battery for inspection or repair, first disconnect the negative (-) terminal cable. When disconnecting the terminal cable, to prevent damage to battery terminal, loosen the cable nut and raise the cable straight up without twisting or prying it. Clean the battery terminals and cable ends with a clean shop rag. Do not scrape them with a file or other abrasive objects. Install the cable ends to the battery terminals after loosening the nut and tighten the nut. Do not use a hammer to tap the cable ends onto the terminals. Be sure the cover for the positive (+) terminal is properly in place.
4. Check hose and wiring connectors to make sure that they are connected securely and correctly.
5. Non-reusable parts Always replace cotter pins, gaskets, O-rings, oil seals, etc. with new ones. Non-reusable parts are indicated in the component illustrations by the "diams" symbol.
6. Precoated parts Precoated parts are bolts, nuts, etc. that are coated with a seal lock adhesive at the factory. If a precoated part is retightened, loosened or caused to move in any way, it must be recoated with the specified adhesive. When reusing precoated parts, clean off the old adhesive and dry with compressed air. Then apply the specified seal lock adhesive to the bolt, nut or threads. Precoated parts are indicated in the component illustrations by the "*" symbol.
7. When necessary, use a sealer on gaskets to prevent leaks.
8. Carefully observe all specifications for bolt tightening torques. Always use a torque wrench.
9. Use of special service tools (SST) and special service materials (SSM) may be required, depending on the nature of the repair. Be sure to use SST and SSM where specified and follow the proper work procedure. A list of SST and SSM can be found in the Preparation article.
10. When replacing fuses, be sure the new fuse has the correct amperage rating. DO NOT exceed the rating or use one with a lower rating.
11. Care must be taken when jacking up and supporting the vehicle. Be sure to lift and support the vehicle at the proper locations (See «VEHICLE LIFT AND SUPPORT LOCATIONS»(ref-227563-S22366850452006040600000) ). Cancel the parking brake on the level place and shift the transmission in N position. When jacking up the front wheels of the vehicle, first place stoppers behind the rear wheels. When jacking up the rear wheels of the vehicle, first place stoppers before the front wheels. When either the front or rear wheels only should be jacked up, set rigid racks and place stoppers in front and behind of the other wheels on the ground. After the vehicle is jacked up, be sure to support it on rigid racks. It is extremely dangerous to do any work on a vehicle raised on a jack, even for a job that can be finished quickly.
12. Observe the following precautions to avoid damage to the following parts: Do not open the cover or case of the ECU unless absolutely necessary. (If the IC terminals are touched, the IC may be destroyed by static electricity.) To disconnect vacuum hoses, pull off the end, not the middle of the hose. To pull apart electrical connectors, pull on the connector itself, not the wires. Be careful not to drop electrical components, such as sensors or relays. If they are dropped on a hard floor, they should be replaced and not reused. When steam cleaning an engine, protect the electronic components, air filter and emission-related components from water. Never use an impact wrench to remove or install temperature switches or temperature sensors. When checking continuity at the wire connector, insert the tester probe carefully to prevent terminals from bending. When using a vacuum gauge, never force the hose onto a connector that is too large. Use a step-down adapter for adjustment. Once the hose has been stretched, it may leak air.
13. Installation and removal of vacuum hose: When pull apart electrical connectors, use tags to identify where they should be reconnected to. After completing a job, double check that the vacuum hoses are properly connected. A label under the hood shows the proper layout.
14. Bleeding of hydraulic brake booster system. When repairing the hydraulic brake booster or ABS, TRAC, VSC system, bleed the air out of the hydraulic brake booster (See «BRAKE FLUID»(ref-227600-S28626584632006040600000) ).
15. Unless otherwise stated, all resistance is measured at an ambient temperature of 20°C (68°F). Because the resistance may be outside specifications if measured at high temperatures immediately after the vehicle has been running. Measurement should be made when the engine has cooled down.

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1. FOR VEHICLES EQUIPPED WITH SRS AIRBAG AND SEAT BELT PRETENSIONER The SEQUOIA is equipped with an SRS (Supplemental Restraint System), such as the driver airbag, front passenger airbag, side airbag assembly, curtain shield airbag assembly and seat belt pretensioner. Failure to carry out service operations in the correct sequence could cause the supplemental restraint system to unexpectedly deploy during servicing, possibly leading to a serious accident. Further, if a mistake is made in servicing the supplemental restraint system, it is possible the SRS may fail to operate when required. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the correct procedure described in this information. GENERAL NOTICE Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic trouble codes become the most important source of information when troubleshooting. When troubleshooting the supplemental restraint system, always inspect the diagnostic trouble codes before disconnecting the battery (See «PRECAUTION»(ref-227602-S18404980602006040600000) ). Work must be started after 90 seconds from the time the ignition switch is turned to the "LOCK" position and the negative (-) terminal cable is disconnected from the battery. (The supplemental restraint system is equipped with a back-up power source because if work is started within 90 seconds of disconnecting the negative (-) terminal cable from the battery, the SRS may deploy.) When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio systems will be cancelled. So before starting work, make a record of the contents memorized in each memory system. When work is finished, reset the clock and audio systems as before. To avoid erasing the memory of each memory system, never use a back-up power supply from another battery. Even in case of a minor collision where the SRS does not deploy, the steering wheel pad, the passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, seat belt pretensioner, airbag sensor assembly, front airbag sensor, side airbag sensor assembly and curtain shield airbag sensor assembly should be inspected. PARTS OF REFERENCE CHART Parts of reference Go To Steering wheel pad See «INSPECTION»(ref-227602-S04945331362006040600000) Passenger side airbag assembly See «INSPECTION»(ref-227602-S19573720692006040600000) Side airbag assembly Power adjuster type See «INSPECTION»(ref-227602-S29718301722006040600000) Side airbag assembly Manual adjuster type See «INSPECTION»(ref-227602-S22771520942006040600000) Curtain shield airbag assembly See «INSPECTION»(ref-227602-S00737349822006040600000) Seat belt pretensioner See «INSPECTION»(ref-227664-S07429285542006040600000) Airbag sensor assembly See «INSPECTION»(ref-227602-S01321163412006040600000) Front airbag sensor assembly See «INSPECTION»(ref-227602-S04796460442006040600000) Side airbag sensor assembly See «INSPECTION»(ref-227602-S24584109752006040600000) Curtain shield airbag sensor assembly See «INSPECTION»(ref-227602-S24584109752006040600000) Never use SRS parts from another vehicle. When replacing parts, replace them with new ones. Before repairs, remove the airbag sensor because shocks are likely to be applied to the sensor during repairs. Never disassemble or repair the steering wheel pad, front passenger airbag assembly, airbag sensor assembly and front airbag sensor. If the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, seat belt pretensioner, airbag sensor assembly and front airbag sensor have been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new ones. Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly, curtain shield airbag assembly, seat belt pretensioner, airbag sensor assembly and front airbag sensor directly to hot air or flames. Use a volt/ohmmeter with high impedance (10 kohms/V minimum) for troubleshooting of the electrical circuit. Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices. After work on the supplemental restraint system is completed, check the SRS warning light (See «PRECAUTION»(ref-227569-S22598505062006040600000) ). SPIRAL CABLE (in Combination Switch) The steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral position, otherwise cable disconnection and other troubles may result. Refer to DI-1118 concerning correct steering wheel installation. STEERING WHEEL PAD (with Airbag) When removing the steering wheel pad or handling a new steering wheel pad, it should be placed with the pad top surface facing up. Storing the pad with its metallic surface upward may lead to a serious accident if the airbag inflates for some reason. In addition do not store a steering wheel pad on top of another one. Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is very dangerous.) Grease should not be applied to the steering wheel pad and the pad should not be cleaned with any kind of detergents. Store the steering wheel pad where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise. When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) under the steering column near the combination switch connector before starting work. When disposing of a vehicle or the steering wheel pad alone, the airbag should be deployed using an SST before disposal (See «DISPOSAL»(ref-227602-S40032001222006040600000) ). Carry out the operation in a safe place away from electrical noise. FRONT PASSENGER AIRBAG ASSEMBLY Always store a removed or new front passenger airbag assembly with the airbag deployment side facing up. Storing the airbag assembly with the airbag deployment side facing down could cause a serious accident if the airbag deploys. Never measure the resistance of the airbag squib (This may cause the airbag to deploy, which is very dangerous). Grease should not be applied to the front passenger airbag assembly and the airbag door should not be cleaned with any kind of detergents. Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise. When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) installed on assembly before starting work. When disposing of a vehicle or the airbag assembly alone, the airbag should be deployed using an SST before disposal (See «DISPOSAL»(ref-227602-S33331919002006040600000) ). Perform the operation in a safe place away from electrical noise. SIDE AIRBAG ASSEMBLY Always store a removed or new side airbag assembly with the airbag deployment side facing up. Storing the airbag assembly with the airbag deployment side facing down could cause a serious accident if the airbag inflates. Never measure the resistance of the airbag squib (This may cause the airbag to deploy, which is very dangerous). Grease should not be attached to the side airbag assembly and the surface should not be cleaned with any kind of detergents. Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise. When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) under the seat before starting work. When disposing of a vehicle or the side airbag assembly alone, the airbag should be deployed using an SST before disposal (See «DISPOSAL»(ref-227602-S13152836682006040600000) or «DISPOSAL»(ref-227602-S39573670142006040600000) ). Perform the operation in a safe place away from electrical noise. CURTAIN SHIELD AIRBAG ASSEMBLY Always store a removed or new curtain shield airbag assembly in a clear plastic bag, and keep it in a safe place. NOTE: Protection bag is not reused. CAUTION: Never disassemble the curtain shield airbag assembly Never measure the resistance of the airbag squib (This may cause the airbag to deploy, which is very dangerous). Grease should not be attached to the curtain shield airbag assembly and the surface should not be cleaned with any kind of detergents. Store the airbag assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise. When using electric welding, first disconnect the airbag connector (yellow color and 2 pins) into the instrument panel before starting work. When disposing of a vehicle or the curtain shield airbag assembly alone, the airbag should be deployed using an SST before disposal (See «DISPOSAL»(ref-227602-S08163274922006040600000) ). Perform the operation in a safe place away from electrical noise. SEAT BELT PRETENSIONER Never measure the resistance of the seat belt pretensioner (This may cause the seat belt pretensioner activation which is very dangerous). Never disassemble the seat belt pretensioner. Never install the seat belt pretensioner in another vehicle. Store the seat belt pretensioner where the ambient temperature remains below 80°C (176°F) and away from electrical noise without high humidity. When using electric welding, first disconnect the connector (yellow color and 2 pins) before starting work. When disposing of a vehicle or the seat belt pretensioner alone, the seat belt pretensioner should be activated before disposal (See «DISPOSAL»(ref-227664-S28860629162006040600000) ). Perform the operation in a safe place away from electrical noise. The seat belt pretensioner is hot after activation, so let it cool down sufficiently before the disposal. However never apply water to the seat belt pretensioner. AIRBAG SENSOR ASSEMBLY Never reuse the airbag sensor assembly involved in a collision when the SRS has deployed. The connectors to the airbag sensor assembly should be connected or disconnected with the sensor mounted on the floor. If the connectors are connected or disconnected while the airbag sensor assembly is not mounted to the floor, it could cause undesired ignition of the supplemental restraint system. Work must be started after 90 seconds from the time the ignition switch is turned to the "LOCK" position and the negative (-) terminal cable is disconnected from the battery, even if only loosening the set bolts of the airbag sensor assembly. WIRE HARNESS AND CONNECTOR The SRS wire harness is integrated with the cowl wire harness assembly and floor wire harness assembly. All the connectors for the system are also a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken due to an accident, etc., repair or replace it.
2. FOR VEHICLES EQUIPPED WITH VEHICLE SKID CONTROL (VSC) SYSTEM NOTE: Even if TRAC is initially OFF, it automatically becomes ON when the vehicle speed becomes about 30 km/h (19 mh) or more. Therefore, please drive in the test mode to avoid dangerous situations caused by the TRAC control. VSC/ABS may be failed when the vehicle is driven on the two-wheel chassis dynamo. Therefore, after driving on the chassis dynamo, please clear DTC before normal driving. Please refer to the «TEST MODE PROCEDURE»(ref-227568-S21987510122006040600000) for the method of clearing DTC. Fasten the vehicle with the lock chain. Confirm VSC system is OFF. Turn the ignition switch OFF. Using SST, connect terminals Ts and CG of DLC3. SST 09843-18040 Start the engine. Check that the VSC TRAC warning light blinks. After the measurement, remove the SST and restart the engine. At this time, make sure that the VSC TRAC warning light is off. Notice in VSC operation. Removal and reinstallation of VSC-related components may cause misadjustment of them. Do not remove or reinstall them unless necessary. When conducting VSC-related operations, do not fail to make sure that the preparation and the finishing of the operation are all performed in accordance with the direction in this text.
3. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER CAUTION: If a large amount of unburned gasoline flows into the converter, it may overheat and create a fire hazard. To prevent this, observe the following precautions and explain them to your customer. Use only unleaded gasoline. Avoid prolonged idling. Avoid running the engine at idle speed for more than 20 minutes. Avoid spark jump test. Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible. While testing, never race the engine. Avoid prolonged engine compression measurement. Engine compression tests must be done as rapidly as possible. Do not run engine when fuel tank is nearly empty. This may cause the engine to misfire and create an extra load on the converter. Avoid coasting with ignition turned off. Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
4. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM For vehicles with mobile communication systems such as two-way radios and cellular telephones, observe the following precautions. Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic system. Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the vehicle's electronic systems. For details about ECU and sensor locations, refer to the information on the applicable component. Do not wind the antenna feeder together with the other wiring as much as possible, also avoid running the antenna feeder parallel with other wire harness. Check that the antenna and feeder are correctly adjusted. Do not install powerful mobile communication system.
5. FOR USING OBD II SCAN TOOL OR TOYOTA HAND-HELD TESTER CAUTION: Observe the following for safety reasons: Before using the OBD II scan tool or TOYOTA hand-held tester, the OBD II scan tool's instruction book or TOYOTA hand-held tester's operator manual should be read thoroughly. Be sure to route all cables securely when driving with the OBD II scan tool or TOYOTA handheld tester connected to the vehicle, (i.e. Keep cables away from feet, pedals, steering wheel and shift lever.) Two persons are required when test driving with the OBD II scan tool or TOYOTA hand-held tester, one person to drive the vehicle and one person to operate the OBD II scan tool or TOYOTA hand-held tester.

GENERAL INFORMATION

A large number of ECU controlled systems are used in the SEQUOIA. In general, the ECU controlled system is considered to be a very intricate system requiring a high level of technical knowledge and expert skill to troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one, troubleshooting of these systems is not complex. If you have adequate understanding of the system and a basic knowledge of electricity, accurate diagnosis and necessary repair can be performed to locate and fix the problem. This information is designed through emphasis of the above standpoint to help service technicians perform accurate and effective troubleshooting, and is compiled for the following major ECU controlled systems

The troubleshooting procedure and how to make use of it are described on the following links.

SYSTEM REFERENCE

ABBREVIATIONS USED

ABBREVIATIONS MEANING DESCRIPTION

See also:
• HOW TO PROCEED WITH TROUBLESHOOTING