DTCS Cannot Be Retrieved
CAUTION:
If ECU replacement is instructed in following testing, always ensure ECU connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECU malfunction.
On all models except GS300, inspect TRAC OFF indicator light circuit. Repair as needed. See TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT. If TRAC OFF indicator light circuit is okay, inspect Tc terminal circuit. See Tc TERMINAL CIRCUIT. If all preceding tests are okay, replace ABS/TRAC ECU and TRAC ECU.
On GS300, inspect TRAC indicator light circuit. Repair as needed. See TRAC INDICATOR LIGHT CIRCUIT. If TRAC indicator light circuit is okay, inspect Tc terminal circuit. See Tc TERMINAL CIRCUIT. If all preceding tests are okay, replace TRAC ECU.