The HIVEC Automaic Transmission supplies the power to the solenoid valves by way of a control relay. When the TCM sets the relay to ON, the relay operates and the battery power is supplied to all the sonenoid valves. When the TCM sets the relay to OFF, all solenoid valve power is shut off and the transmission is held in the 3rd gear position. (Fail Safe Mode )
The TCM checks the A/T control relay signal by monitoring the contol signal. If, after the iginiton key is turned on, an unexpected voltage value, which is quite a bit lower than battery voltage is detected, the TCM sets this code.
Item | Detecting Condition & Limp Home | Possible Cause |
DTC Strategy | ● Check voltage range | ● Open or short in circuit ● Faulty A/T control relay ● Faulty PCM/TCM |
Enable Conditions | ● Voltage of Battery >9V ● Time after TCM turns on >0.5sec | |
Threshold Value | ● Voltage <7V | |
Diagnostic Time | ● 0.1sec | |
Fail Safe | ● Locked in 3 rd gear.(control relay off) |
