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.
Component Function Check
- INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engine start?
YES-1: With CONSULT: GO TO 2.
YES-2: Without CONSULT: GO TO 3.
NO: Go to "DIAGNOSIS PROCEDURE ".
- CHECK IGNITION SIGNAL FUNCTION
With CONSULT
- Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
- Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES: INSPECTION END
NO: Go to "DIAGNOSIS PROCEDURE ".
- CHECK IGNITION SIGNAL FUNCTION
Without CONSULT
- Let engine idle.
- Read the voltage signal between ECM harness connector terminals under the following conditions with an oscilloscope.
ECM Voltage signal + - Connector Terminal Connector Terminal F101 11 M107 128 12 15 16 19 20 NOTE: The pulse cycle changes depending on RPM at idle.Is the inspection result normal?
YES: INSPECTION END
NO: Go to "DIAGNOSIS PROCEDURE ".
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.