Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTIONWhen driving uphill under cruise control, in order to reduce the number of shifting due to ON-OFF overdrive operation and to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a signal to prevent up-shift until the end of the uphill slope is sent from the cruise control ECU assy to the electronically controlled transmission.
Terminal ECT of the cruise control ECU assy detects the shift change signal (output to electronically controlled transmission No.2 solenoid) from the ECM.
If the vehicle slows down, also when terminal ECT of the cruise control ECU assy receives down shifting signal, it sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the number of gear shifts are reduced and gear shift points in the electronically controlled transmission are changed.
Wiring Diagram:
Step 1 - 3:
Step 4 - 5:
INSPECTION PROCEDURE