Note On Intermittents

WARNING: This page is about a different car, the 1992 Cadillac Seville and 1992 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE: Test number refers to number on diagnostic chart.

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