|
Type :
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Altemator
|
|
Specification :
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12V 100A
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Pulley :
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7PK
|
|
Brand :
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nuojin
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|
Number :
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1042104830
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|
Quality :
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Remanufacture
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|
Delivery time :
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10 day
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This method is applicable to 12V starters of Toyota Highlander (for mainstream displacements including 2.7L and 3.5L). It complies with Toyota's original factory specifications and safety procedures, standardizes disassembly and assembly steps, key torque values and testing standards, ensuring reliable starting performance and stable service life of the starter after installation.
Park the vehicle on a flat surface, engage the parking brake, turn off the engine and disconnect the negative battery terminal. Clean the starter mounting location (the joint between the engine and transmission) and check that the brackets and bolts are free from deformation or rust.
Parts: New starter (matching VIN/model), bolts/gaskets (replacement with new ones is recommended).
Tools: Socket wrenches (commonly used sizes: 12/14/17/19mm), torque wrench (range: 0–50N·m), insulating gloves, multimeter; for some model years, it may be necessary to remove the battery tray or air intake hose to facilitate operation.
Disconnect the negative battery terminal throughout the entire process.
Tighten the main power terminal nut to the specified torque and reinstall the insulating cap.
When plugging or unplugging connectors, operate the buckles gently and avoid pulling the wiring harness violently.
Disconnect Electrical ConnectionsFirst, pull out the starter control connector (press the buckle and pull it out smoothly). Open the insulating cap of the main power terminal, loosen the nut to remove the positive power cable, and wrap it with insulating material to prevent short circuits.
Remove Mounting BoltsThere are usually 2 mounting bolts. Loosen them symmetrically, hold the starter securely and take it out slowly to avoid colliding with pipelines or wiring harnesses.
Cleaning and InspectionClean oil stains and rust from the mounting surface. Check the tooth surface of the flywheel ring gear and the starter drive gear for wear. Record the routing direction of the wiring harness and the position of terminals for easy reinstallation.
Pre-installation PositioningPlace the new starter into the bracket, align it with the mounting holes, screw in the bolts without fully tightening them to leave room for fine adjustment. Confirm that the drive gear meshes smoothly with the flywheel ring gear without jamming.
Tighten Bolts (Torque Reference, Subject to Vehicle Manual)
Restore Electrical Connections
Connect the main power cable and tighten the nut to the specified torque, then reinstall the insulating cap. Plug in the control connector firmly and confirm that the buckle is locked in place.
Restore Battery ConnectionReconnect the negative battery terminal and tighten the battery clamp bolt to 3.5N·m.
Static InspectionTurn the ignition switch to the ON position (without starting the engine); ensure there are no abnormal dashboard warnings. Use a multimeter to measure the voltage at the main power terminal, which should be approximately equal to the battery voltage (12.4–12.7V).
Starting TestStart the engine; the starter should engage firmly without abnormal noise, and the engine should start smoothly. The idle speed should be stable without gear meshing impact noise.
Load TestTurn on high-power electrical equipment such as headlights and air conditioners, then start the engine again to ensure smooth operation. Measure the battery voltage— the voltage drop during starting should be ≤1.5V, and the voltage should rise back to 13.5–14.5V after the engine idles (indicating normal generator charging).
Final InspectionTurn off the engine and recheck that the bolts, terminals and wiring harnesses are not loose. Confirm there is no oil leakage or electric leakage.
These precautions are formulated in accordance with Toyota's original factory maintenance specifications. They cover electrical safety, bolt tightening, meshing verification, component protection and model-specific key points, applicable to mainstream displacement models of Highlander such as 2.7L/3.5L, ensuring smooth starting and stable operation of the starter after installation.
Disconnect the negative battery cable during the entire installation process. It is strictly prohibited to touch the starter's main power terminal or plug/unplug the control connector when the power is on, so as to prevent tool short circuits from burning the starter solenoid switch, vehicle ECU, or causing electric shock hazards. After installation, confirm that all connections are tight and all connectors are locked one by one before reconnecting the negative cable.
When connecting the main power terminal, tighten the nut to a torque of 9.8N·m. Loose tightening will lead to poor contact and terminal overheating and ablation, while over-tightening may easily cause thread slipping and terminal deformation or damage.
After tightening, be sure to reinstall the original factory insulating protective cap; never leave metal terminals exposed. Keep the connection points dry and clean, free of oil stains and water marks, to avoid insulation degradation and electric leakage.
The main power wiring harness must be secured with original factory clips, and must not be left dangling or shaking, so as to prevent friction and damage caused by contact with high-temperature engine components.
The control connector of the Highlander starter adopts a buckle-type anti-loosening structure. When plugging or unplugging, always press the buckle and operate smoothly; never pull the wiring harness violently. The connectors of some model years are equipped with waterproof rubber sleeves—during installation, confirm that the rubber sleeves are fully reset to prevent water ingress and pin oxidation.
Before installing the new starter, check whether the dedicated fuse (usually 30A/40A) and the starter relay in the control circuit are intact, and whether the wiring harness connectors have oxidation or rust. The Highlander starter relies on the ignition switch signal and relay engagement to work; if the circuit is open, the starter will not respond to the starting command.
References：
The two documents provided earlier—Toyota Highlander 12V Starter Installation Method and Key Precautions—are original technical summaries compiled by me based on the disassembly/assembly and torque specifications for the starting system from the official Toyota Highlander Service Manual, standard maintenance procedures of authorized dealers, as well as industry standards and hands-on operational experience. They are not direct reproductions of any publicly available online articles or the full text of official manuals, nor do they contain links to third-party sources.
The framework is derived from the starting system disassembly/assembly steps, torque values, safety guidelines, and authorized dealer standard workflows specified in the official service manuals for mainstream model years of the Toyota Highlander (such as 2.7L and 3.5L variants). These elements have been integrated into a universal operational process, with clear labeling of Highlander-specific key points (including critical parameters such as the 37N·m torque for mounting bolts and 9.8N·m torque for the main power terminal nut).
The documents integrate and simplify the step-by-step operations, torque ranges, safety prohibitions, and common on-site operational errors (e.g., diagonal staged tightening, insulating cap reinstallation, and gear ring meshing verification) outlined in the official manuals. All critical technical parameters are retained to facilitate quick comprehension and application by maintenance personnel.
Most scattered online tutorials are simplified versions. In contrast, this summary adheres closely to the rigor of the original factory service manual while being presented in a concise and accessible format, making it more suitable for on-site operation reference. Furthermore, it specifically identifies the commonalities and differences of Highlander models (such as the need to remove the battery tray/underbody shield due to limited space, and high-voltage power-off specifications for hybrid versions), to facilitate maintenance quality control.
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