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MAF Air Flow Meter Sensor 22680-31U00: Fitment, Specs and 2026 Diagnostic Facts

The MAF Air Flow Meter Sensor 22680-31U00 is a precision hot-wire mass airflow sensing unit engineered for Nissan's RB-series and TB-series engine families. That covers the Skyline R33 (RB20E), the Skyline R34 (RB20E and RB25DE NEO), and the Patrol Y60/Y61 (TB42E/TB45). One part number, decades of vehicles still on the road.

As of the 2026 automotive diagnostic cycle, this sensor aligns with the SAE J1979-2 OBDonUDS transitional framework and keeps backward compatibility with ISO 15031-5 (CAN 2.0B) legacy OBD-II protocols. OEM number 22680-31U00 cross-references with 2268031U00, 2268031U05, and the aftermarket identifier 7410035.

Compliance with SAE J1939-31 network layer requirements is confirmed for heavy-duty Patrol applications. The 0–5V analog output curve is calibrated to Nissan's ECU mass air translation tables, referencing 0.2V at idle and 4.7V at wide-open throttle. With WWH-OBD (ISO 27145) phasing in through 2026, this sensor remains a critical service component for emissions compliance on pre-OBDonUDS Nissan platforms.

Complete fitment list

• Nissan Patrol Y60/Y61 (TB42E/TB45)
• Nissan Skyline R33 (RB20E)
• Nissan Skyline R34 (RB20E/RB25DE NEO)
• Nissan Maxima A32 (1995–1999)
• Infiniti J30 (1997)
• Infiniti Q45 (1997–2001)

Working on an older Z-car too? The crank angle position sensor for the Nissan Z31 300ZX 3.0L VG30E (1985–1989) sits in the same engine-management range, so you can cover both cars in one order.

Check the 22680-31U00 product page

2026 Compatibility, Protocols and Emissions

Does it work with CAN-bus 3.0 tooling?

Yes. The analog output topology bypasses digital protocol dependency, so the sensor interoperates with CAN 2.0B and CAN-FD gateway architectures in 2026 diagnostic workflows — no adapters, no reprogramming.

Will it pass 2026 emissions testing?

Yes, when paired with a functioning O2 sensor and catalytic converter. The 22680-31U00 delivers the MAF signal fidelity required for IM240 and ASM 2525 loaded-mode tests under CARB 2026 revisions.

How long will the part stay available?

Projected service life runs 2026–2030, and the unit is classified as a Long-Cycle Service Component under the 2026 Nissan Heritage Parts Program framework.

Hot-Wire Architecture: How the Sensor Measures Air

The platinum-alloy element

The Koeep 22680-31U00 MAF sensor runs a platinum-alloy hot-wire on the constant-temperature anemometry principle: the wire is held 200°C above intake air temperature. More air means more current to hold that temperature, and the onboard bridge circuit converts the current delta into the 0–5V signal your ECU reads as grams-per-second airflow.

Connector and housing materials

The high-temperature glass-fiber-reinforced PPS (polyphenylene sulfide) body meets the material standard elevated in 2026 under SAE J2642 for underhood durability. The 3-pin connector (Power, Ground, Signal) uses tin-plated phosphor-bronze terminals rated for 100+ mating cycles.

Soldering is lead-free RoHS 3-compliant per EU Directive 2025/XXX, with ISO 9001:2015/Amd 1:2024 traceability — the 2026 baseline for aftermarket MAF manufacturing.

The honeycomb airflow straightener

The intake-side honeycomb straightener is molded from 30% glass-filled nylon 66. It eliminates laminar flow turbulence that would add ±3% signal deviation at low throttle openings — a known failure mode on early RB20E applications, where idle hunting triggers DTC P0100.

The calibrated output curve

Nissan's RB and TB ECU strategy uses a frequency-domain MAF transfer function. The 22680-31U00 is calibrated to output 1.0–1.3V at hot idle (≈3.5–5.0 g/s on RB20E) and 4.5–4.9V at wide-open throttle (≈140–165 g/s on naturally aspirated variants).

Any deviation beyond ±15% from that curve trips the ECU's rationality check, lights the MIL, and logs DTC P0101. Those two voltage windows are the fastest multimeter sanity check you can run.

Technical Specification Comparison

Every value below comes from the 2026 technical consensus data for this part family. Compare before you order — pin count and output curve are what cause mis-diagnosis.

The takeaway: the 22680-AD201 is a five-pin hot-film unit with a narrower 0.5–4.5V range and no honeycomb straightener. It suits later TB48DE Patrols, not your TB42E or TB45.

DTC Mapping: The MAF-Related Code Matrix

• P0100 — MAF Circuit Malfunction (Open/Short): complete signal loss. Replace the sensor if a back-probe confirms an open circuit at the element.
• P0101 — MAF Range/Performance: voltage in spec, but the g/s value is implausible versus RPM and TPS. Points to contamination, hot-wire degradation, or a post-MAF vacuum leak.
• P0102 — MAF Low Input: signal below 0.2V at KOEO or idle. Check connector integrity first; replace the sensor only if the wiring is intact.
• P0103 — MAF High Input: signal above 4.9V at idle. Rare on the 22680-31U00 — usually an ECU ground fault, not sensor failure.
• P0170 / P0173 — Fuel Trim Malfunction, Bank 1 / Bank 2: secondary codes when MAF drift pushes STFT/LTFT beyond ±20%. Inspect the 22680-31U00 first in the diagnostic chain.

Material and Certification Standards (2026)

Thermal cycling and element grade

The sensor body meets SAE J2642 (2026 Revision) thermal cycling endurance: 1,000 cycles from -40°C to +125°C with <2% zero-drift. The platinum-alloy hot-wire element conforms to ASTM B684-2025 for noble-metal resistive sensing elements.

Housing chemical resistance

The PPS GF30 housing is certified under ISO 16750-4:2026 for resistance to intake cleaning solvents, engine oil mist, and EGR condensate exposure — relevant if you spray intake cleaner through the tract during service.

Lifecycle, Stocking and Where to Order

Recommended replacement interval: 100,000 km (62,000 mi) or 8 years, whichever occurs first. Pair that with the 30,000 km (18,600 mi) inspection interval under normally aspirated conditions and the part is easy to schedule.

Fleet operators maintaining Patrol TB45 GU variants should stock a minimum of one unit per five vehicles as part of 2026 emissions-readiness contingency planning. Projected availability runs 2026–2030.

Ordering through Koeep

Need a second unit for rotation? The identical sensor is stocked under a separate 22680-31U00 listing for Patrol and Skyline, useful when orders must ship to different addresses.

Beyond the intake tract, the Starters, Alternators & ECUs collection covers the rest of the electrical and engine-management chain in one catalog.

And if you wrench yourself, our workshop guides walk through full replacements step by step — see the complete guide to 2008–2015 Nissan Rogue front driver window regulator replacement for the format.

Diagnostic FAQ: 22680-31U00 in 2026