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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Controls - Tests W/Codes - Body Control Computer) >> Self Diagnostic Tests >> Test 1A - Trouble Codes

Test 1A - Trouble Codes

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

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.
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