Probable Causes:

Open in ECT1 circuit for 2 seconds or more (DTC 81).
Open in ESA1 circuit for .5 seconds after .5 seconds at idle. (DTC 83).
Open in ESA2 circuit for .5 seconds after .5 seconds at idle. (DTC 84).
Open in ESA3 circuit for .5 seconds after .5 seconds at idle. (DTC 85).