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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