General Information

Automatic Transaxle
P0642 Sensor Reference Voltage 'A' Circuit Low - General Information

Component Location





General Description

TCM supply Power source to each sensors and solenoids in order to optimum control. It is difficult check for power supply circuit Because E-module installed in inside Automatic transmission.

DTC Description

TCM set this code If supplied voltage form TCM is too Low. (MIL ON : 2 driving Cycle)

DTC Detecting Condition





CAUTION :
1. The function with the higher priority will always take precedence. However, a low-priority is not overruled by a higher priority function.
2. Functions from different priority categories can also run in parallel. It is important to note which function will take precedence in this case.
3. In such an event it is possible for a substitute function with low priority not be carried out if a second, higher-priority function is present. This has been taken into account when compiling the priority list and is international.
4. The mechanical emergency run function must always have the highest priority, since from the electrical standpoint it is the only safe condition.

Signal Waveform & Data








Fig 1) Main relay and Battery voltage (Idle status)
Fig 2) Main relay and Battery voltage (Ignition "ON")