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.
Diagnosis And Testing
SELF-CHECK DIAGNOSTICS
The CMTC/EVIC is capable of performing a diagnostic self check on its internal functions. CMTC/EVIC diagnostics may be performed using a DRBIII® or by using the following procedure:
- With the ignition switch in the OFF position, depress and hold the RESET and the C/T buttons.
- Turn the ignition switch to the ON position.
- Continue to hold both buttons until the software versions are displayed, then release the buttons.
- All of the VFD segments will illuminate for 2-4 seconds. Check for segments that do not illuminate or illuminate all the time.
- When the self-check is complete the EVIC will display one of the following messages:
- PASS SELF TEST
- FAILED SELF TEST
- NOT RECEIVING J1850 MESSAGE
- To exit the self-check mode, depress the RESET button or cycle the ignition switch and the CMTC/EVIC will return to normal operation.
If a Communication fault is displayed, refer to the symptom list. If a FAILED is displayed, the CMTC/EVIC must be replaced.
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.