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.
Work Flow: Inspection
Proceed trouble diagnosis according to the check sheet results (example).
Case 1: Replace ECM.
Case 2: Replace TCM.
Case 3: Replace BCM.
Case 4: Check harness between TCM and combination meter. Refer to "CIRCUIT CHECK BETWEEN TCM AND COMBINATION METER ".
Case 5: Check Harness between combination meter and BCM. Refer to "CIRCUIT CHECK BETWEEN COMBINATION METER AND BCM ".
Case 6: Check ECM circuit. Refer to "ECM CIRCUIT CHECK ".
Case 7: Check TCM circuit. Refer to "TCM CIRCUIT CHECK ".
Case 8: Check combination meter circuit. Refer to "COMBINATION METER CIRCUIT CHECK ".
Case 9: Check BCM circuit. Refer to "BCM CIRCUIT CHECK".
Case 10: Check IPDM E/R circuit. Refer to "IPDM E/R CIRCUIT CHECK ".
Case 11: Check CAN communication circuit. Refer to "CAN COMMUNICATION CIRCUIT CHECK
Case 12: Check IPDM E/R ignition relay circuit. Refer to "IPDM E/R IGNITION RELAY CIRCUIT CHECK "
Case 13: Check IPDM E/R. Refer to "IPDM E/R CHECK ".
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.