PCM/EC Information Flag 84. Saturn Saturn 1994

For 1990-2009 cars

# PCM/EC Information Flag 84

Subject: | Service Information on PCM/EC Information Flag 84

Models: | 1993 and 1994 Saturns equipped with automatic transaxles

### Purpose

When resetting automatic transaxle adaptives or downloading, a transaxle calibration using the Saturn service stall system (SSS), a PCM/EC information flag 84 may be set. PCM/EC information flag 84 indicates a communications fault between the PCM/EC and the PCM/TC. This is a normal condition when the above SSS service procedures are performed.

If a PCM/EC information flag 84 is set following the reset of transaxle adaptives or download of a transaxle calibration, reset the PCM/EC diagnostic trouble codes and information flags using either the portable diagnostic tool (PDT) or Saturn service stall system. If a PCM/EC information flag 84 is set without resetting adaptives or downloading a calibration, refer to the service procedures in the "Electronic Engine Controls Service Manual."

PCM information flags are intended to provide additional diagnostic information for technicians when diagnosing. PCM diagnostic trouble codes or intermittent concerns and do not, by themselves, indicate a problem with the PCM or other component.