Note On Intermittents

PCM Code E034 is usually set by a vacuum supply problem to MAP sensor. Check for proper vacuum routing, MAP hose connected to proper throttle body port or MAP hose chafed, pinched or cut. Apply vacuum to MAP hose at throttle body, and look for vacuum leaks in MAP hose or MAP sensor.

Fig 1: PCM Code E034, Schematic, MAP Signal Too High

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E034, Flow Chart, MAP Signal Too High

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E034