Monitor Description
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The ECM commands gear shifts by turning the shift solenoid valves ON and OFF. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.