Dtc P1878: Torque Converter Clutch Shudder - Suzuki SX4 Service Manual

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 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 "C07-9"
terminal of TCM 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?

DTC P1878: Torque Converter Clutch Shudder

DTC Detecting Condition and Trouble Area
DTC detecting condition
The acceleration slip control function stops when the variation in the
output revolution speed of the specified amplitude and specified cycle
is detected within a specified period of time. When the specified
variation is not detected after the acceleration slip control stops.
DTC Confirmation Procedure
WARNING
!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTCs in TCM and ECM memories by using scan tool.
3) Start engine and warm it up to normal operating temperature.
4) Drive vehicle with 3rd or 4th gear in "D" range and slip controlled lock-up ON for 20 seconds or longer referring to
"A/T System Diagram".
5) Stop vehicle.
6) Check DTC, pending DTC and freeze-frame data.
DTC Troubleshooting
Step
1 Was "A/T System Check" performed?
2 Change A/T fluid referring to "A/T Fluid Change".
Check DTC after performing "DTC Confirmation Procedure".
Is DTC P1878 still indicated?
Action
Action
Automatic Transmission/Transaxle:
Yes
Go to Step 2.
Substitute a known-
good TCM and recheck.
Substitute a known-
good BCM and recheck.
"YEL" wire shorted to
ground.
Trouble area
• Mismatching ATF
• Torque converter clutch malfunction
• Valve body
Yes
Go to Step 2.
Faulty torque converter
clutch.
Replace torque
converter.
5A-71
No
Go to "A/T System
Check".
Go to Step 3.
Go to Step 4.
Replace "3" position
switch.
S7RW0A5104040
No
Go to "A/T System
Check".
System is in good
condition.