Set Timing Circuit Diagnosis

Fig 1: Set Timing Circuit Diagnosis Schematic

Initial base timing is set by jumpering terminals "A" and "B" together at the ALDL connector. This must be done outside of diagnostics. ALDL is located under center of dash. The "SERVICE ENGINE SOON" light should flicker while in "set timing" mode.

Fig 2: Set Timing Circuit Diagnosis Flow Chart

Fig 3: Set Timing Circuit Diagnosis Flow Chart