Notes On Intermittents

WARNING: This page is about a different car, the 1988 Cadillac Seville and 1988 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Manipulate affected wiring and connectors while observing ECM parameter ED02. Apply and release vacuum to MAP sensor vacuum port using a vacuum source. If ECM parameter code ED02 displays greater than 105 kPa, condition has been induced and cause of intermittent should be repaired. If wiring and connectors are okay, substitute a known good sensor and retest.

Review snapshot data parameters stored with this code to verify failure. If failure is verified, check and repair intermittent wiring connection or sensor.

Fig 1: Schematic, Code EO31, Shorted MAP Sensor Circuit

Fig 2: Flow Chart, Code EO31, Shorted MAP Sensor Circuit

NOTE: If a hard code EO31 is accompanied by a hoard code EO38, See DFI Chart A, "Multiple ECM Codes Stored Hard".

Fig 3: Flow Chart, Code EO31, Shorted MAP Sensor Circuit