P1576

Brake 1 switch correlation error with brake switch 2

View and note freeze frame data if available.

Make sure the brake switches connectors are secure.

Make sure the battery voltage is greater than 10V.

Disconnect engine ECM and proceed to pinpoint test 1:

P1577

Brake 2 switch correlation error with brake switch 1

1

Turn ignition on, operate rear brake switch and check brake light operation.

OK

Proceed to test 2

Faulty

Rectify fault, proceed to test 6

2

Check cable and terminal integrity:

- Engine ECM pin C14

- Engine ECM pin C26

- Ignition switch pin 8

OK

Disconnect front and rear brake switch connectors, proceed to test 3

Faulty

Rectify fault, proceed to test 6

3

With brakes released, check front and rear brake switch operation:

The following should be short circuit:

- Front brake switch pin 8 to pin 7

- Rear brake light switch pin 3 to pin 2

The following should be open circuit:

- Front brake switch pin 8 to pin 6

- Rear brake light switch pin 3 to pin 1

With the front brake switch pressed the following should be short circuit:

- Front brake switch pin 8 to pin 6

The following should be open circuit:

- Front brake switch pin 8 to pin 7

With the rear brake switch pressed the following should be open circuit:

- Rear brake light switch pin 3 to pin 2

OK

Proceed to test 4

Faulty

Replace relevant brake switch, proceed to test 6

4

Re-Connect the brake switch connectors. Check cable continuity:

- Engine ECM pin C14 to front brake switch pin 6

- Engine ECM pin C26 to rear brake switch pin 2

- Engine ECM pin C14 to rear brake switch pin 1

- Engine ECM pin C14 to front brake switch pin 6

With the brake switches released:

- Engine ECM pin C26 to ignition switch pin 4

OK

Proceed to test 5

Open Circuit

Locate and rectify wiring fault, proceed to test 6

5

Re-Connect the brake switch connectors. With the ignition switch on, measure the following Voltages:

- Engine ECM pin C26 to ground

- Rear brake switch pin 1 to ground (with rear brake pedal depressed)

- Rear brake switch pin 2 to ground (with rear brake pedal released)

- Rear brake switch pin 3 to ground

- Front brake switch pin 8 to ground

- Front brake switch pin 7 to ground (with front brake lever released)

- Front brake switch pin 6 to ground (with front brake lever pressed)

Greater than 10V

Proceed to test 6

Less than 10V

Locate and rectify wiring fault, proceed to test 6

6

Reconnect harness, clear fault code and run engine.

OK

Action complete - quit test

Fault still present

Contact Triumph service