Cobb Accessport V3 — Toyota 4Runner 2025+

The Accessport is now available for the Toyota 4Runner—bringing full visibility and control to the engine and transmission for the first time.

The Cobb Accessport V3 is the most proven and flexible ECU and transmission tuning solution available for modern Toyota platforms. It replaces overly conservative factory calibrations with smarter, more refined strategies while maintaining long-term reliability and emissions compliance.

Run Cobb’s off-the-shelf (OTS) maps or pair the Accessport with a custom CAMTuning calibration to unlock its full potential.

Why Pair It With a Custom Tune?

OTS maps are a solid starting point.
Custom tuning is where the 4Runner really comes together.

A CAMTuning custom calibration allows the tune to be tailored to:

• Your specific 4Runner

• Fuel quality

• Modifications

• Intended use (daily driving, off-road, towing)

The result is smoother power delivery, improved throttle control, and transmission behavior that feels natural and predictable—on pavement or off-road.

What the Accessport Does

Installed in-cabin, the Accessport becomes your ECU and TCM command center:

• Monitor up to six live parameters at once

• Flash ECU and TCM calibrations in minutes

• Store up to 100 maps (OTS + custom)

• Customize gauge layouts for street, off-road, towing, or performance use

• Wide range of mounting solutions and optional bezel colors

If you’ve ever wanted insight into what the ECU is doing—or the ability to change how it responds—this is the tool.

4Runner-Specific Advantage: ECU + TCM Control

This Accessport also flashes the transmission control module (TCM).

That means:

• Improved shift logic

• More consistent gear selection

• Better throttle-to-shift coordination

• Higher torque limits where appropriate

• Reduced gear hunting, especially when towing or climbing grades

Bottom line: the 4Runner’s automatic transmission finally behaves the way it should.

TCM Map Options

Choose from three transmission personalities depending on how you drive:

Simulated Stock

OEM-like behavior with monitoring capability.

OEM+

Refined and daily-friendly:

• Moderately higher shift points

• More responsive downshifts

• Subtle throttle response improvements

• Increased torque limits

Sport

More aggressive performance behavior:

• Higher shift points

• Faster downshifts

• Sharper mid-throttle response

• More assertive torque strategy

ECU Map Options

• Stage 0 — Stock calibration, monitoring only

• Stage 1 (87 / 91 / 93) — Optimized for pump gas and common bolt-ons

• Performance Tow — Maintains thermal strategy while improving usable torque

Custom CAMTuning calibrations are available for modified vehicles or owners with specific drivability or performance goals.

Gateway Bypass Harness Included

Some Toyota 4Runner models require a Gateway Bypass Harness for initial communication and ROM reading.
It is included.

Connection process:

• OBD-II → Harness

• Harness → Gateway connector

• Harness → Accessport

After initial setup, the harness is not required for future map changes or uninstalling.

(Installation documentation is provided.)

Emissions Compliance

non-hybrid:

50-State Legal
Legal for sale and use on emissions-controlled vehicles in all 50 states when installed according to the manufacturer’s application guide.

CARB EO: D-660-174

Hybrid (i-Force Max):

NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY EMISSION CONTROLLED MOTOR VEHICLE.

Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending. Once testing is complete with California, and an EO number is issued, this product will be updated to 50-state legal status.

Important Note

⚠️ Do not install the Accessport over software other than OEM or Cobb.
If you are unsure what is currently installed, contact us before flashing—we’re happy to verify.