Riviera V6-231 3.8L VIN L SFI (1991)
Body Control Module: Reading and Clearing Diagnostic Trouble Codes
Clearing Diagnostic Trouble Codes
To clear trouble codes proceed as follows:
1.
Enter diagnostics.
2.
Select code by system type. After all codes have been displayed and you have decided which control system code (ECM/PCM or BCM) by
pressing the "FAN UP" after the "EC?" or "BC?" message is displayed. If you only want to clear BCM codes, you must press "FAN DOWN" after
the "EC?" message, since it is displayed first. This process will access the specific system in which you wish to clear codes.
3.
Select "CLEAR CODES." After accessing the appropriate system, either ECM/PCM or BCM, test mode messages will be displayed and you must
respond by repeatedly pressing the "FAN DOWN" until the "CLR E CODE?" or "CLR B CODE?" message is displayed for the system you
accessed. Next, press the "FAN UP" which will result in an "E CODE CLR" or "B CODE CLR" message. Now, press "BI-LEVEL" to exit
diagnostics and then re-enter diagnostics to verify if the trouble codes were cleared.
Selection of the "CLEAR CODES?" test type will result in either the message "CODES CLEAR" or "CODES/X NOT CLEAR" being displayed,
indicating wether the codes were successfully cleared. This message will appear for 3.0 seconds to indicate that all stored trouble codes have been erased
from that systems memory. After 3.0 seconds the display will automatically return to the next available test type for the selected system.
NOTE: SIR code 51 cannot be cleared without the use of an ALDL scan tool. Refer to "SIR TROUBLE CODE CHARTS" under COMPUTERIZED
ENGINE CONTROLS/DIAGNOSIS AND TESTING PROCEDURES/TESTING PROCEDURES/DIAGNOSTIC CHARTS.
