Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition Timing Control System: Notes
The ignition system controls ignition timing by matching vehicle operating conditions to preprogrammed timing advance and retard specifications. These parameters are stored in the Electronic Control Unit (ECU) memory. The computer uses input from the crank angle sensor, coolant and various other sensors to determine advance requirements.
Ignition timing is controlled by the ECU according to engine operating conditions. Optimum ignition timing for various driving conditions is preprogrammed and stored in the ECU. ECU receives and processes electrical signals from various sensors to determine present driving conditions. ECU will then select the optimum timing signal for the present driving conditions and send voltage signal to the power transistor to control timing advance and detonation retard operation (if equipped).
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.