Test 1A - Identifying Vehicle Communication Problems
Connect scan tool to Data Link Connector (DLC) to retrieve messages. If scan tool message is blank, see NO RESPONSE DIAGNOSIS table and proceed to appropriate test number. Disconnect scan tool. Ensure ground circuit has continuity at DLC terminal No. 4. Ensure 12 volts is present at DLC terminal No. 16. Try another scan tool and/or cable. See BUS FAULT MESSAGES table and proceed to appropriate test number.
BUS FAULT MESSAGES
| Fault Messages | Test No. |
|---|---|
| BUS SHORT TO BATTERY | TEST 2A |
| BUS SHORT TO 5 VOLTS | TEST 3A |
| BUS SHORT TO GROUND | TEST 4A |
| BUS (+) & BUS (-) SHORTED TOGETHER | TEST 5A |
| NO TERMINATION | TEST 6A |
| BUS BIAS LEVEL TOO LOW | TEST 7A |
| BUS BIAS LEVEL TOO HIGH | TEST 7A |
| BUS (+) OPEN | TEST 8A |
| BUS (-) OPEN | TEST 8A |
| BUS (+) & (-) OPEN | TEST 8A |
| NO BUS BIAS | TEST 8A |
| NOT RECEIVING BUS MESSAGES CORRECTLY | TEST 9A |
NO RESPONSE DIAGNOSIS
| Problem Module | Test No. | ||
|---|---|---|---|
| Air Bag Control Module (ACM) | TEST 10A | ||
| Anti-Lock Brake Controller Module | TEST 11A | ||
| Body Control Module (BCM) (1) | TEST 12A | ||
| Instrument Cluster | TEST 13A | ||
| Powertrain Control Module (PCM) | TEST 14A | ||
| Smart Key Immobilized Module (JX Only) | TEST 15A | ||
| Transmission Control Module (TCM) | TEST 16A | ||
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