Suzuki WagonR+ RB310 Service Manual page 2760

TCM POWER AND GROUND CIRCUIT CHECK
(AUTOMATIC TRANSMISSION DOESN'T SHIFT TO 1ST GEAR AT VEHICLE
START IN "D" RANGE)
STEP
1 Check voltage between terminal "A12" of TCM
coupler and body ground with ignition switch
ON.
Is it 10 – 14 V?
2 Check voltage between terminal "A25" of TCM
coupler and body ground with ignition switch
ON.
Is it about 0 V?
Terminal arrangement of TCM coupler
(Viewed from harness side)
ACTION
AUTOMATIC TRANSMISSION (4 A / T) 7B-29
YES
Go to Step 2.
Poor "A12" or "A25"
connection.
If all above are OK,
replace known-good
TCM and recheck.
1. Battery
2. Main fuse
3. Ignition switch
4. Circuit fuse (IG)
5. Ground
6. A / T relay
NO
"P/Bl" wire open or faulty
A/T relay.
"B" wire open.