Diagnosis & Testing: Notes

CAUTION: DME ignition system voltage is extremely high. Contact with current-carrying parts while engine is running could prove fatal. Always turn ignition switch to "OFF" position or remove battery ground cable when connecting testers or replacing system components. High voltage is particularly present at spark plug, distributor, and ignition coil connections and at terminal 1 of the CU. DO NOT attempt to check ignition system by a sparking test of spark plugs. This may destroy ignition coil or CU.

NOTE: The DME system tests are limited. Complete testing of the DME system requires an oscilloscope, voltmeter, ohmmeter and special test leads to insert in multiple pin CU connector.