Test 1A - Identifying Vehicle Communication Problems
WARNING: This page is about a different car, the 1997 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
Battery must be fully charged before proceeding. Connect scan tool to Data Link Connector (DLC) to retrieve messages. Ensure ground circuit has continuity at terminal No. 4 on DLC. Ensure 12 volts exists at terminal No. 16 on DLC. See BUS FAULT MESSAGES table and proceed to appropriate test number. If NO RESPONSE message is displayed, see NO RESPONSE DIAGNOSIS table and proceed to appropriate test number.
BUS FAULT MESSAGES
| Fault Message | Perform |
|---|---|
| BUS SHORT TO BATTERY | TEST 4A |
| BUS SHORT TO 5 VOLTS | TEST 5A |
| BUS SHORT TO GROUND | TEST 6A |
| BUS (+) & BUS (-) SHORTED TOGETHER | TEST 7A |
| NO TERMINATION | TEST 8A |
| BUS BIAS LEVEL TOO LOW | TEST 9A |
| BUS BIAS LEVEL TOO HIGH | TEST 9A |
| NOT RECEIVING BUS MESSAGES CORRECTLY | TEST 10A |
| NO BUS BIAS | TEST 11A |
| BUS (+) OPEN | TEST 12A |
| BUS (-) OPEN | TEST 12A |
| BUS (+) & BUS (-) OPEN | TEST 12A |
NO RESPONSE DIAGNOSIS
| Problem Module | Perform |
|---|---|
| Air Bag Control Module | TEST 2A |
| Central Timer Module | TEST 13A |
| Compass Mini-Trip System | TEST 14A |
| Powertrain Control Module | TEST 3A |