Component Tests and General Diagnostics

Media oriented systems transport (MOST) diagnosis

Vehicle diagnosis

CAUTION: Make sure the tester is not connected to the MOST network when either switching the tester on or switching between 2+0 and 2+4, as the tester emits a brief pulse of light which could introduce a fault into the network.

1. Use the approved diagnostic system or a scan tool to retrieve any DTCs.
2. Set the connector selector switch to 2+0.
3. Disconnect the intermediate fibre optic cable connector and connect the male half to the tester connector at the top of the unit using the adaptor in the kit.
4. Turn the tester on and check the operation of the power indicator.
5. Set the LED/beep selector to LED.
6. Turn the ignition switch to the ON position.
7. If the green LED is active, a signal has been received indicating that the first half of the optical ring is functioning.
8. If the green LED is NOT active, no signal has been received indicating that the first half of the optical ring is NOT functioning.
^ A ring break code should be set as a result of this. Use the approved diagnostic system to trace the fault and clear the code.