Suzuki Swift Sport 2004 Service & Repair Manual page 714

5A-70 Automatic Transmission/Transaxle:
DTC Detecting Condition and Trouble Area
DTC detecting condition
"3" position switch ON signal is inputted although transmission range
switch signal is inputted P, R, N or L. range.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories by using scan tool and turn ignition switch ON.
3) Shift select lever to each of "L", "2", "3", "D", "N", "R" and "P" ranges for 20 seconds each.
4) Check DTC, pending DTC and freeze-frame data.
DTC Troubleshooting
Step
1 Was "A/T System Check" performed?
2 "3" position switch circuit for operation
1) Connect SUZUKI scan tool to DLC with ignition switch
OFF.
2) Turn ignition switch ON and check "3" position switch
signal on scan tool data display when shifting select
lever to each range.
Does indicate "3" position switch (O/D OFF switch) condition
OFF when shifting select lever to "P", "R", "N" and "L" range?
3 "3" position switch signal inspection
With ignition switch ON, check voltage between "L01-8"
terminal of BCM coupler and ground.
"3" position switch specifications
Shift select lever to "3" or "2" range: Battery voltage
Shift select lever to other above range: 0 V
Is the result as specified?
4 Check "3" position switch operation
Is it in good condition?
Action
Trouble area
• "3" position switch or its circuit malfunction
• BCM
• TCM
Yes
Go to Step 2.
Substitute a known-
good TCM and recheck.
Substitute a known-
good BCM and recheck.
"LT GRN" wire shorted
to ground.
No
Go to "A/T System
Check".
Go to Step 3.
Go to Step 4.
Replace "3" position
switch.