INTERMITTENT C/C ENGAGEMENT INSTALL NEW SERVICE MEM-CAL

VEHICLES AFFECTED: 1990 V

Some 1990 Allantes produced before January 16, 1990 with a VIN breakpoint 1G6VS338LU126127 may experience an intermittent condition where the cruise control will not engage or will lose speed when the set/coast button is depressed. This condition may be caused by an improper PROM calibration in the MEM-CAL unit of the ECM.

To identify the improperly calibrated PROM enter diagnostics and select ECM data, parameter ED99 "PROM I.D.". Check the parameter display against the PROM I.D. chart listed below. If the PROM I.D. matches, install the new service MEM-CAL listed to correct the engagement condition.

PROM I.D. CHART

New New New PROM Broadcast Service PROM Broadcast Carline I.D. Code MEM-CAL I.D. Code

'90 Allante (USA) 2006 APNF 16151465 2009 AUNX Export 2007 APJZ 16151467 2010 AUNY

Removal and installation procedures are located in Section 6E-C1 of the Service Information Manual.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.