Hi bobd hope this helps

Note that the fault codes cannot be deleted untill all of them have been displayed at least once and the first one is displayed again. With the flylead still inserted in socket 2 .....(or whatever socket you are trying to clear) of module A or B. Switch on the ignition, press the test button and hold it down for approx 5 seconds the LED will light. When the led lights and before it goes out, press and hold the test button down for a further 5 seconds then release it, the led will go out, switch off the ignition. You than can check that all the fault codes have been deleted by swithcing the ignition on again and pressing the test buttion for 1 second code 1-1-1 should appear. If a code other than 1-1-1 apprear, record the code then repeat the deleting procdure.

Ketchb