![]() However, there may be more than just one DTC stored, in which case they are spit out sequentially with 1.5 sec pauses between them, until the whole sequence repeats again. ![]() Then, if that is the only DTC stored, it begins repeating that DTC with the "tens" again. The end of the "ones" is indicated by a 1.5 second pause. The long pulses indicate "tens" and the short ones indicate "ones" so you add up the number of long pulses to get the left digit of the DTC and you add up the number of short pulses to get the right digit of the DTC. If the light's blinking with one or more long (1.2 sec) pulses, followed by one or more short (.2 sec) pulses followed by a 1.5 sec pause, then you're seeing a TCM diagnostic trouble code (DTC). If the light's on solid or not on at all, then there's a problem with the light's circuit. If the light's blinking 2 times a second, then the TCM believes all is normal. If the light's blinking 4 times a second, then the problem is most likely a power supply or ground problem. ![]() I swear I'm not making this up.ĥ) Drive the vehicle at speeds greater than 12 MPHħ) Depress the brake pedal and move the gear selector to "1" It's one of those secret handshake procedures reminiscent of the pre-OBD ECU days. Here's the procedure for interrogating the TCM for the 2002 Impreza (all variants). In any event, the flashing AT Oil Temp light indicates that the Transmission Control Module (TCM) has detected a problem and is trying to tell you about it. ![]()
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