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Fail-Safe ECS007SQ
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is a an error in
a main electronic control input/output signal circuit.
In fail-safe mode the transmission is fixed in 2nd, 4th, or 5th (depending on the breakdown position), so the
customer should feel “slipping” or “poor acceleration”. When fail-safe mode is triggered, when the ignition
switch is switched “ON”, the AT CHECK indicator lamp flashes for about 8 seconds.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Also, the AT CHECK indicator lamp flashes for about 8 seconds once, then is cleared.
Therefore, the customer's vehicle has returned to normal, so handle according to the “diagnostics flow” (Refer
to AT-46, "WORK FLOW" ).