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6-Pin Bike-Side Harness Hardware Test

charlie@ftecu.comcharlie@ftecu.com Posts: 24Staff User
in Troubleshooting & Important Reads

If you are using a 6-pin Bike-Side Harness and are receiving communication or flashing errors, the first step is to verify that the harness is installed correctly and that each circuit is functioning as intended.

This test requires:

  • A small jumper wire or bent paper clip
  • A digital multimeter set to DC volts

This procedure is for 6-pin Bike-Side Harnesses only.

Before You Begin

Disconnect the USB DataLink from the Bike-Side Harness, or remove the weather-seal cap from the 6-pin connector.

Look at the face of the 6-pin connector, opposite the side where the wires enter the connector, and identify the Red, Orange, Yellow, and Black wire positions.

The connector positions used by the 6-pin Bike-Side Harness are:

  • Black = A
  • Yellow = D
  • Orange = E
  • Red = F

Use the molded letters on the connector to confirm the positions before performing the test.

Test 1: Red and Orange

  1. Turn the motorcycle's ignition OFF.
  2. Use a jumper wire or bent paper clip to connect the Red (F) and Orange (E) terminals at the 6-pin connector.
  3. Turn the ignition ON.

If the fuel pump primes

There is likely a connection issue with the Red or Orange circuit.

Check the related connections carefully. Make sure the terminals are:

  • Installed in the correct locations
  • Fully seated in the ECU connector
  • Properly locked into the connector
  • Not loose or backed out

If the fuel pump does not prime

Turn the ignition OFF and continue to Test 2.

Test 2: Red and Yellow

  1. With the ignition OFF, remove the previous jumper.
  2. Connect the Red (F) and Yellow (D) terminals.
  3. Turn the ignition ON.

If the fuel pump primes

There is likely a connection issue with the Yellow circuit.

Check that the Yellow-wire terminal is installed in the correct position, fully seated, and properly locked into the ECU connector.

If the fuel pump does not prime

Continue to the voltage tests below.

Test 3: Check Orange Circuit Voltage

Set your multimeter to DC volts.

Measure between:

  • Black (A)
  • Orange (E)

You should see approximately 5 V and the reading should remain consistent.

Test 4: Check Yellow Circuit Voltage

Measure between:

  • Black (A)
  • Yellow (D)

You should again see approximately 5 V, with a reading that is consistent with the Orange-circuit measurement.

If the Voltage Readings Are Incorrect

If the readings are low or inconsistent, recheck the Bike-Side Harness installation and connections.

Pay particular attention to the Black ground connection. The ground eyelet must have a solid metal-to-metal connection with the motorcycle frame.

Do not install the ground eyelet over:

  • Paint
  • Clear coat
  • Corrosion
  • Other material that could prevent a solid electrical connection

Also verify that the Orange and Yellow terminals are fully seated and installed in the correct ECU connector positions.

If All Tests Pass

If both jumper tests and both voltage tests pass but you are still unable to communicate with or flash the ECU, the Bike-Side Harness may not be the source of the problem.

At that point, record:

  • Motorcycle year, make, and model
  • ECU part number
  • The exact error shown in the Tuning Suite
  • Whether the ECU can be read
  • Results of both jumper tests
  • Orange-to-Black voltage
  • Yellow-to-Black voltage

Questions or Concerns?

If you have any questions or concerns regarding this test or your flashing hardware, please contact us at sales@ftecu.com.

When possible, include your motorcycle's year, make, and model, ECU part number, exact Tuning Suite error message, and the results from each test above so we can better assist you.

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