So far this one has been stumping us. EJ25 DOHC. Symptoms are bad/hard shifting and the AT OIL TEMP light flashing. No CEL or OBD codes. Did the shifter thing and got an error code 23 from the TCM - "AT LOAD SIGNAL", which goes from the ECM to the TCM. I followed the troubleshooting guide and confirmed the signal is out of range, and have checked the cabling and replaced the TCM, ECM, and MAF sensor (with junkyard parts). Nothing has changed the error or behaviour.
Can anyone offer any suggestions?
Thanks much.