Ignition Timing: Testing and Inspection

Base ignition timing is referenced to the position of the Crankshaft Position (CKP) sensor and is set to 10 degrees +/- 2 degrees before top dead center and is not adjustable.

The technician should be aware that diagnosis and testing of Ignition Timing Control should begin at the Powertrain Management System level, where testing begins with Diagnosis by Symptom, and is narrowed to testing of a "specific" subsystem and it's related wiring and components. Following the appropriate diagnostic routines may prevent misdiagnosis and unnecessary component replacement. Refer to Powertrain Management/Testing and Inspection/Procedures.