FALSE CODE 34/SUSTAINED IDLE NEW PROMS AVAILABLE

MODELS AFFECTED: 1982 CIMARRONS - MANUAL TRANSMISSION

Some 1982 Cimarrons equipped with a manual transmission may set a false intermittent code 34 if engine vacuum exceeds the calibrated threshold (10 in.) needed to set a code 34 during a sustained idle or low speed deceleration.

To diagnose this false (intermittent) code 34, perform the "Diagnostic Circuit Check" on page 6E-16 of the 1982 Service Information Manual and physically check the vacuum sensor wiring for proper connections, pinches or cuts.

A service PROM is available through GMWDD to correct this false code 34 in cases where the check engine light appears intermittently during a sustained idle or deceleration. Service PROM part numbers are as follows:

Begin End Service Service Service B.P. B.P. PROM I.D. PROM P/N ECM P/N ---- ----- --------- -------- ------- 400001 416172 1376AML 1226721 1225330 416173 423220 1464ADN 1225753 1225500 423221 423711 1336AWB 1225751 1225500 430001 432258 1336AWB 1225751 1225500

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.