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.
Preliminary Check
Prior to component diagnosis, a preliminary check must be performed.
-- Connect the scan tool.
-- Switch the ignition on.
-- Using the scan tool, check for any stored or related DTCs.
If other DTCs are stored:
-- Repair these DTCs first before performing the following procedure.
If no other DTCs are stored:
-- Using the scan tool, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
-- Perform a road test to attempt to duplicate the customers complaint.
If the DTC returns:
-- Perform the diagnostic procedure.
If the DTC does not return:
-- The fault is intermittent or a sporadic condition may exist.
-- Check the suspected component, electrical harness and electrical harness connectors for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
-- Perform a road test to verify the repair.
If the DTC returns:
-- Perform the diagnostic procedure.
If the DTC does not return:
The fault may have been the result of a loose electrical connection.
-- Generate readiness code. Refer to READINESS CODE .
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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.