23209-39145
DENSO 23209-39145 Iniettore Diretto Benzina Toyota Lexus 2.0T
23209-39145, 23209-31090, 23209-39146, 23209-39195, 23209-39215--200 barPanoramica Prodotto
The Denso 23209-39145 (Toyota OE 23209-31090 / 23209-39146) is the original equipment high-pressure direct fuel injector for Toyota and Lexus 8AR-FTS 2.0L Turbo and 2GR-FKS 3.5L V6 engines equipped with D-4S dual-injection technology. Operating at continuous rail pressures up to 200 bar (2900 psi), this low-impedance solenoid injector is actuated by an external Electronic Driving Unit (EDU) to discharge a specialized laser fan-spray pattern directly into the piston bowl. Installed across leading models including the Toyota Highlander, Crown, Lexus RX300, NX300, and IS300, it cures chronic high-load engine misfires (P0300, P0301-P0304), sluggish boost response, and hard warm starting caused by clogged direct injection micro-nozzles.
D-4S DUAL INJECTION DIAGNOSTIC TRAP & TEFLON SEAL RULE: On Toyota D-4S engines, low-pressure port injectors operate at idle and light cruise, masking direct injector failure. Misfires (P0300/P0301-P0304) appear only under medium-to-heavy throttle when the ECU shifts fuel delivery to direct injectors at 200 bar. Furthermore, the lower virgin Teflon combustion seal (Toyota 23291-31010) must never be re-used; installing an uncalibrated or dry-crushed seal causes cylinder compression blow-by and melted injector tips.
Applicazioni Veicolo e Motore
| Veicolo | Motore | Anni |
|---|---|---|
| Toyota Highlander 2.0T | Toyota / Lexus 2.0L Turbo 8AR-FTS D-4ST (DOHC 16V) | 2015-2021 |
| Toyota Crown 2.0T S210 | Toyota / Lexus 2.0L Turbo 8AR-FTS D-4ST (DOHC 16V) | 2015-2020 |
| Lexus RX200t / RX300 AL20 | Toyota / Lexus 2.0L Turbo 8AR-FTS D-4ST (DOHC 16V) | 2015-2022 |
| Lexus NX200t / NX300 AZ10 | Toyota / Lexus 2.0L Turbo 8AR-FTS D-4ST (DOHC 16V) | 2014-2021 |
Specifiche Tecniche
| Specifica | Valore |
|---|---|
| Injector Generation | Denso High Pressure Gasoline Direct Injector (D-4S DI Subsystem) |
| Operating Rail PressureSpecifica Chiave | |
| Injection System Architecture | Toyota D-4S (Combined Port MPI + In-Cylinder Direct GDI) |
| Spray Pattern | High-Dispersion Laser Multi-Hole Fan Pattern into Piston Bowl |
| Coil Resistance | 1.8 to 2.4 Ohms at 20°C (Low-Impedance Peak-and-Hold via EDU) |
| Combustion Seal Type | Virgin Teflon (PTFE) Ring with Stainless Backup Ring |
| Teflon Ring Service Part | Toyota OE 23291-31010 |
| Fuel Rail Retaining Torque | 10 N·m (Criss-cross pattern) |
| Tightening Torque | 10 N·m |
| Coppia serraggio staffa | 10 N·m |
| ECU Calibration Coding | Self-adapting closed-loop via dual-injection strategy |
| Pressione di esercizioSpecifica Chiave |
Pompa alta pressione abbinata (Gruppo circuito carburante)
Funziona sullo stesso circuito ad alta pressione Common Rail. In caso di bassa pressione rail (P0087), verificare la portata della pompa prima di sostituire gli iniettori.
Istruzioni di montaggio
Attrezzatura necessaria: Toyota SST Teflon seal replacement and sizing tool set, Torque wrench calibrated for 10 N·m range, 10mm and 12mm sockets with extensions, Bore cleaning brass brush and lint-free cotton swabs, Clean engine oil or assembly lubricant for upper fuel rail O-rings
- Relieve high-pressure fuel rail residual pressure using Toyota Techstream active test or by cracking high-pressure union wrapped in rags.
- Remove intercooler piping, engine wire harness retainers, and intake manifold sound insulation.
- Disconnect injector electrical harness clips from the direct injector bodies.
- Remove fuel rail retaining bolts and gently pull the high-pressure fuel rail and direct injectors out of the cylinder head.
- Clean carbon varnish from each injector bore using a brass brush and vacuum debris from the cylinder head ports.
- Cut away old Teflon combustion seals using a plastic pick; do not gouge the injector brass sealing groove.
- Install the backup spacer ring, then slide the new virgin Teflon ring over the assembly cone into the groove.
- Slide the sizing sleeve over the Teflon ring and rotate gently for 3 minutes to compress the ring back to bore diameter.
- Install a new Viton O-ring onto the fuel rail inlet neck lubricated with clean engine oil (never lubricate the combustion Teflon seal).
- Seat the injectors into the fuel rail with their locking clips engaged, align into cylinder head bores, and push firmly until seated.
- Torque the fuel rail mounting bolts in a criss-cross pattern to 10 N·m, reinstall charge pipes, prime fuel system, and perform leak checks.
- Teflon Seal Dry Assembly Mandate: Never lubricate the lower white Teflon combustion seal with oil, silicone, or WD-40. The seal must contact the bore dry so it expands under 200-bar combustion heat and seals effectively.
- D-4S Port vs Direct Identification: Do not confuse the low-pressure port injectors (mounted on the intake manifold runner) with the high-pressure direct injectors (mounted directly into the cylinder head). This part number applies exclusively to the 200-bar direct injection rail.
- Peak-and-Hold Low-Impedance Circuit: Denso D-4S direct injectors have a resistance of approximately 2.0 Ohms. Never connect 12V battery voltage directly to the injector pins during bench testing; testing must be done using a dedicated GDI injector driver to avoid burning the coil.
Domande Frequenti (FAQ)
Why does my Toyota Highlander 2.0T misfire only when accelerating hard, but idles smoothly?
This is the classic symptom of a failing Denso direct fuel injector on Toyota D-4S engines. At idle and light cruise, the engine operates primarily on low-pressure port injectors. When you accelerate hard and boost rises, the ECU shifts 100% of fuel delivery to the 200-bar direct injectors. If an in-cylinder direct injector is clogged or dripping, misfire codes P0300 or P0301-P0304 appear only under boost.
Can I test Denso D-4S direct injectors with a standard 12V test light?
No. Denso D-4S direct injectors are low-impedance (approx. 2.0 Ohms) driven by an external Injector Driver (EDU) using high-voltage peak-and-hold signals (up to 70V). Applying continuous 12V battery power will permanently burn out the injector internal solenoid coil in seconds.
Do Denso 23209-39145 direct injectors require compensation coding in Toyota Techstream?
Unlike diesel common rail injectors that require individual IMA compensation codes, Denso 8AR-FTS direct injectors are manufactured to extremely precise volumetric flow standards. The Toyota ECU automatically performs real-time individual cylinder air-fuel ratio balance learning via the wideband air-fuel sensor.
Can I reuse the Teflon combustion chamber seal when pulling the fuel rail?
No. The white Teflon combustion ring expands irreversibly upon exposure to combustion heat. Once removed, an old seal will never re-seat properly and will allow 200-bar combustion gas blow-by, which melts the plastic injector body and ruins the cylinder head bore.
Say this to the shop: How can Techstream prove the direct injector is faulty rather than the port injector?
Ask the technician: 'Please use Techstream Active Test to lock fuel injection mode to Port Injection Only, then Direct Injection Only. If misfires disappear completely on Port Injection and reoccur exclusively on Direct Injection Cylinder 3, we have definitive proof of a direct injector failure without guessing.'
Codici Guasto (DTC) e Protocolli Diagnostici
Codici guasto diagnostici (DTC) comuni generati quando questo iniettore common rail presenta usura, problemi ai circuiti o scostamenti:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Riferimenti incrociati e compatibilità
Codici gemelli, varianti della stessa piattaforma e incompatibilità note.
Protocolli Tecnici di Diagnosi & Assistenza
Procedure d'officina verificate, valori soglia di test e linee guida operative per questo assieme.