Note On Intermittents

This code can be caused by an open, short to ground or short to voltage on circuits No. 472 and/or 476, an open or short in sensor connector, engine-to-dash connector or PCM connector. If no problems are found in wiring or connectors, substitute a known good sensor, and retest.

1. Using voltage-to-temperature graph, check sensor calibration.

Fig 1: PCM Code E074, Schematic, Intermittent MAT Sensor Signal

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E074, Flow Chart, Intermittent MAT Sensor Signal

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E074