Diagnostic System Check: Notes

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Test numbers refer to numbers on diagnostic chart. To identify circuits and terminals referenced in text and flowcharts, see WIRING DIAGRAM .

Fig 1: Diagnostic System Check Flow Chart - 1 Of 3

Courtesy of GENERAL MOTORS CORP.

Indicates if EBCM is transmitting data.
Checks for serial data line malfunction.
Checks for proper scan tool connection to DLC.
Checks for open fuse.
Checks EBTCM ground resistance. Should be less than 2 ohms.
Checks for current DTCs.
Checks for proper ABS warning light operation.
Checks for history DTCs.
NOTE: Test numbers refer to numbers on diagnostic chart. To identify circuits and terminals referenced in text and flowcharts, see WIRING DIAGRAM .

Fig 2: Diagnostic System Check Flow Chart - 2 Of 3
Courtesy of GENERAL MOTORS CORP.
Checks for possible short to ground in battery feed circuit.
Checks for possible short to ground in EBCM.
Ensures short to ground is not due to physical damage of circuit.
NOTE: Test numbers refer to numbers on diagnostic chart. To identify circuits and terminals referenced in text and flowcharts, see WIRING DIAGRAM .

Fig 3: Diagnostic System Check Flow Chart - 3 Of 3
Courtesy of GENERAL MOTORS CORP.
Checks for open in switched power circuit between EBCM and stop light switch circuit.
Checks for high resistance in the switched ignition circuit.
Ensures malfunction is not due to poor terminal contact.