Intermittent MIL ON, DTC 34 on Long Drives or Upgrades

90cadillac07
Bulletin No. T-90-66
File in Group 6E
Number 80
Corp. Ref. No. 016512
Date May, 1990



SUBJECT: INTERMITTENT CHECK ENGINE LIGHT CODE 34 SETS ON LONG DRIVES OR UPGRADES

MODELS AFFECTED: 1986-1990 BROUGHAMS EQUFPPED WITH 5.0L ENGINE


Some 1986-1990 Broughams may experience an intermittent Check Engine Light (CEL) with a code 34 on long drives or upgrades.

This condition may be due to low TPS output voltage. If the TPS output voltage is lower than 2.0 volts during the condition, the code will set.

To diagnose and repair this condition use the Tech 1 to monitor the TPS output. With ignition on and engine off, monitor the TPS voltage at WOT. If it is less than 2.0 volts, replace the TPS with P/N 17078448.

Parts are currently available from GMSPO.