Reading TCU Error Codes

There is a well-documented procedure to read error codes from the TCU. You move the selector lever through each gear position, clicking the manual button each time. Then you count the flashes of the Power Mode light. See http://www.svx-iw.com for details.

The TCU error codes can also be queried using the Select Monitor Adapter. On an SVX, the current codes are stored as bit flags in locations 0x0001 and 0x0005. The previous codes are stored in locations 0x0003 and 0x0004. The software also contains error codes 34,35,41-45 and 51-55 but these do not seem to be documented in the Subaru Service Manuals.

	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0
0001/0003	Shift Sol 3 (13)	Duty Sol A (11)	Duty Sol B (12)	Duty Sol C (24)	Shift Sol 2 (14)	Speed Sensor 2 (33)	Speed Sensor 1 (32)	Shift Sol 1 (15)
0005/0004	n/a	n/a	unknown (26) [VTD only]	Torque Control Signal (25)	Atmospheric Sensor (22)	Engine RPM Signal (23)	ATF Temp Sensor (21)	Throttle Sensor (31)
0095/-	n/a	unknown(43)	unknown (44)	unknown (35)	n/a	n/a	n/a	n/a
0096/-	n/a	unknown (41)	unknown (45)	unknown (52)	unknown (53)	unknown (54)	unknown (55)	unknown (51)
0097/-	n/a	n/a	n/a	n/a	n/a	unknown (34)	n/a	n/a
0098/-	n/a	n/a	n/a	n/a	unknown (42)	n/a	n/a	n/a