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.
Test 1A - Trouble Codes
Battery must be fully charged before proceeding. Trouble codes displayed will fit 2 categories: DRB trouble codes and bus trouble codes. Connect DRB to Data Link Connector (DLC) to get trouble code. See TROUBLE CODES table and proceed to appropriate test number. If DRB screen is blank, go to TEST 2A.
| Trouble Codes | Test No. | |
|---|---|---|
| DRB Trouble Codes | ||
| RAM TEST FAILURE | 3A | |
| CARTRIDGE ERROR | 4A | |
| KEY PAD TEST FAILURE | 5A | |
| LOW OR HIGH BATTERY | 6A | |
| Bus Trouble Codes | ||
| SHORT TO BATTERY | 7A | |
| SHORT TO 5 VOLTS | 8A | |
| SHORT TO GROUND | 9A | |
| BUS (+) & BUS (-) SHORTED TOGETHER | 10A | |
| NO TERMINATION | 11A | |
| BUS BIAS LEVEL TOO LOW | 12A | |
| BUS BIAS LEVEL TOO HIGH | 12A | |
| BUS (+) OPEN | 12A | |
| BUS (-) OPEN | 12A | |
| BUS (+) & (-) OPEN | 12A | |
| NO BUS BIAS | 13A | |
| NOT RECEIVING BUS MESSAGES CORRECTLY | 14A | |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.