Suzuki Wagon R Plus RB310 Service Manual page 618

Step
4 Check TCM Ground Circuit.
1) Turn ignition switch OFF.
2) With TCM connectors disconnected, check
for proper connection to TCM at "E13-1"/
"E13-23" terminal.
3) If OK, check resistance between "E13-1"/
"E13-23" terminal of disconnected TCM
connector and body ground.
Is continuity indicated?
Action
AUTOMATIC TRANSAXLE (M13 ENGINE) 7B1-49
Yes
TCM power and ground
circuits are in good condi-
tion.
No
"BLK" circuit for TCM
ground open.