Suzuki WagonR+ RB310 Service Manual page 1445

7B-34 AUTOMATIC TRANSMISSION (4 A/T)
DTC P0720 Output shaft speed sensor circuit malfunction
1. Output shaft speed sensor (A/T VSS)
2. Coupler
3. Shield wire
DTC DETECTING CONDITION
• Output shaft speed sensor signal voltage too high or too low.
Step
1 1) Turn ignition switch OFF and disconnect
output shaft speed sensor – input shaft
speed sensor coupler. (See figure.)
2) Measure the resistance between terminals
of disconnected sensor side coupler.
Is it 160 – 200 Ω?
(See figure.)
2 1) Connect output shaft speed sensor – input
shaft speed sensor coupler then disconnect
TCM couplers.
2) Measure resistance between terminal "E12-
6" and "E12-14" of disconnected harness
side coupler.
Is it 160 – 200 Ω?
(See figure.)
4. TCM
5. TCM couplers (viewed from harness side)
Action Yes
Go to Step 2.
Go to Step 3.
No
Replace output shaft
speed sensor.
"W" or "B" wire open or
shorted each other.