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 | TEST 3A | |
| CARTRIDGE ERROR | TEST 4A | |
| KEY PAD TEST FAILURE | TEST 5A | |
| LOW OR HIGH BATTERY | TEST 6A | |
| BUS Failure Message | ||
| SHORT TO BATTERY | TEST 7A | |
| SHORT TO 5 VOLTS | TEST 8A | |
| SHORT TO GROUND | TEST 9A | |
| BUS + & BUS - SHORTED TOGETHER | TEST 10A | |
| NO TERMINATION | TEST 11A | |
| BUS BIAS LEVEL TOO LOW | TEST 12A | |
| BUS BIAS LEVEL TOO HIGH | TEST 12A | |
| BUS + OPEN | TEST 12A | |
| BUS - OPEN | TEST 12A | |
| BUS + & BUS - OPEN | TEST 12A | |
| NO BUS BIAS | TEST 13A | |
| NOT RECEIVING BUS MESSAGES CORRECTLY | TEST 14A | |