Suzuki Wagon R Manual page 755

7B-44 AUTOMATIC TRANSMISSION (4 A / T)
DTC 43 – SHIFT SOLENOID NO.3
DTC 45 – SHIFT SOLENOID NO.4
DTC 48 – SHIFT SOLENOID NO.5
STEP
1 1) Turn ignition switch OFF and disconnect
solenoid coupler.
2) Measure resistance between terminal of
solenoid coupler and transmission ground.
(See figure below.)
Is it about 3 Ω?
2 1) Disconnect TCM couplers.
2) Measure resistance between solenoid
coupler terminal of body side and TCM
coupler terminal connected to dropping
resister (A1, A2 or A3). (See chart below.)
Is it about 8 Ω?
3 Check continuity between terminal of TCM
coupler and terminal of solenoid coupler.
(See chart below.)
Is there continuity?
4 Check continuity between solenoid coupler
terminal and transmission ground with TCM,
dropping resister and solenoid couplers
disconnected.
Is there continuity?
5 Check continuity between dropping resister
terminal and transmission ground.
(See chart below.)
Is there continuity?
ACTION YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
Circuit between TCM and
transmission is shorted
to ground.
Circuit between TCM and
dropping resister is
shorted to ground.
1. Dropping resister
2. Solenoid coupler
3. Shift solenoid No.3
4. Shift solenoid No.4
5. Shift solenoid No.5
6. TCM coupler
NO
D Short in between
solenoid lead wire and
ground.
D Malfunction of solenoid
valve.
Inspect dropping resister
referring to "ON-VEHICLE
SERVICE" in this section.
If OK, circuit between
TCM and dropping
resister or dropping
resister and solenoid
coupler is open.
Circuit between TCM and
solenoid coupler is open.
Go to Step 5.
Substitute a known-good
TCM and recheck.