Sub ROM Unit

SUB ROM UNIT





1. Installing location: The valve body upper part
2. Function: To obtain A/T fluid pressure stability by compensating for solenoid & valve body unit fluid pressure differential.





3. Principle: Install additional ROM onto valve body of automatic transmission and input fluid pressure differential of solenoid & valve body so that TCM reads the input data to perform fluid pressure compensation.
4. Maintenance
1. When replacing with a new TCM in the vehicle
^ TCM automatically reads SUB ROM DATA during I, G ON. At this time, shift range valve is off for about 2.5 second.
2. When replacing A/T (regardless of new or old ones) in the vehicle
^ Must erase SUB ROM DATA stored in TCM.
^ Erase SUB ROM DATA in SCAN TOOL delete mode during shift stage in R-range + accelerator opening angle maintains 50% + I, G ON.
^ TCM reads SUB ROM DATA from a new A/T upon I, G ON again after I, G OFF.
3. Moving TCM from vehicle A to another vehicle B.
^ Perform the same way as in 2) above.