General

Scope.
Test readings and directions for measuring signals and signal levels on the Trionic control module are given in the following charts.

Some Important Points To Remember.
^ Readings should be taken with a Breakout Box (BOB) connected between the control module and the control module's connector.
^ Several voltage levels should be regarded as guiding values. Your common sense should tell you whether a reading is correct or not.
^ If any test reading is obviously incorrect, use the wiring diagram to trace the leads, connectors or components which you consider ought to be checked more thoroughly.
^ The articles referred to in the tables "Function" and "Fault Diagnosis contain a description of the relevant signal's function and a referral to a fault diagnosis schedule with detailed, step-by-step instructions explaining the diagnostic procedure to be followed.
^ All test readings are for a warmed-up engine.
^ Unless otherwise stated, the ignition should be switched on.
^ The test readings are in respect of a calibrated FLUKE 88/97.