Suzuki sq-416-420-625 Service Manual page 448

7B1-46 AUTOMATIC TRANSMISSION (4 A / T)
DTC P0741 TCC (LOCK-UP) SOLENOID VALVE PERFORMANCE OR STUCK OFF
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
While running in 2nd or 4th gear, D range, TCC control
of PCM does not agree with actual operation of trans-
mission TCC even though solenoid valve is electrically
in good condition.
(2 driving cycles detection logic)
DTC CONFIRMATION PROCEDURE
WARNING:
D 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.
D Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool and check fuel level meter
indication is 1/4 or more.
3) Start engine, warm it up to normal operating temperature and shift transfer lever to "2H" or "4H" range.
4) Increase vehicle speed with D range, and check that gear position changes from 1st to 2nd and keep driving
about 20 mph, 30 km/h in 2nd of "D" range for 10 seconds. (Throttle valve should be not at idle position and
the opening should be kept constant in this step.)
5) Keep driving about 50 mph, 80 km/h in 4th of "D" range for 10 seconds.
6) Release accelerator pedal, decrease vehicle speed and stop vehicle.
7) Check pending DTC and DTC by using scan tool.
TROUBLESHOOTING
STEP
1 Was "A/T DIAG. FLOW TABLE" performed?
2 TCC solenoid valve operation check:
1) Check TCC solenoid valve operation referring to
"Solenoid Valves Operation Check" in this section.
Is it in good condition?
3 Valve body check:
1) Check valve body referring to "Unit Repair" in this
section.
Is it in good condition?
ACTION
TROUBLE AREA
D TCC (lock-up) solenoid valve stuck
D TCC control valve stuck
D Valve body fluid passage clogged
D TCC faulty
YES
Go to Step 2.
Go to Step 3.
Faulty torque
converter.
NO
Go to "A/T DIAG.
FLOW TABLE".
Faulty TCC solenoid
valve.
Faulty valve body.