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AUTOMATIC TRANSAXLE DIAGNOSIS TSB Revision AUTOMATIC TRANSAXLE 23A-270 LOGIC FLOW CHARTS (Monitor Sequence) . DTC SET CONDITIONS Check Conditions • Voltage of battery: 9 volts or more. • Time after PCM turns on A/T control relay: 0.5 second or more. Judgement Criteria • A/T control relay output voltage: 7 volts or less. (0.1 second) • If DTC 54 (P1751) is set consecutively four times, the transaxle is locked into 3rd gear as a fail-safe . OBD-II DRIVE CYCLE PATTERN Start the engine, and keep the vehicle stopped in "P" . AC205241 START END No Malfunction Yes Good No Yes No Yes No Yes No Yes Timer start TCM turn on A/T Timer > 0.5 sec. Voltage of battery > 9 V Output voltage from Continuous failure PCM AB |