Test 1A - Trouble Codes
Battery must be fully charged before proceeding. Use this diagnostic information only when instructed to by another diagnostic article. Display will fit 2 categories: scan tool failure message or BUS failure message. Connect scan tool to Data Link Connector (DLC) to read message. See TROUBLE CODES table and proceed to appropriate test. If scan tool screen is blank, go to TEST 2A.
TROUBLE CODES
| Message | Test No. | |
|---|---|---|
| Scan Tool Failure Message | ||
| RAM TEST FAILURE | 3A | |
| CARTRIDGE ERROR | 4A | |
| KEY PAD TEST FAILURE | 5A | |
| LOW OR HIGH BATTERY | 6A | |
| BUS Failure Message | ||
| 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 + & BUS - OPEN | 12A | |
| NO BUS BIAS | 13A | |
| NOT RECEIVING BUS MESSAGES CORRECTLY | 14A | |