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.
Diagnostic Procedure
- CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No
Yes (With CONSULT-III): GO TO 2.
Yes (Without CONSULT-III): GO TO 3.
No: GO TO 4.
- CHECK OVERALL FUNCTION
With CONSULT-III
- Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.
- Make sure that each circuit produces a momentary engine speed drop.
OK or NG
OK: INSPECTION END
NG: GO TO 10.
- CHECK OVERALL FUNCTION
Without CONSULT-III
- Let engine idle.
- Read the voltage signal between ECM terminals 9, 10, 11, 21 and ground with an oscilloscope.
- Verify that the oscilloscope screen shows the signal wave as shown below.NOTE: The pulse cycle changes depending on RPM at idle.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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