No Lock-Up Occurs - Suzuki GRAND VITARA JB416 Service Manual

5A-21 Automatic Transmission/Transaxle:

No Lock-Up Occurs

System Description
TCM turns TCC pressure control solenoid OFF under any of the following conditions.
• Engine coolant temperature is lower than 60 °C (140 °F).
• 4L/N switch (if equipped) is turned ON. (4L or N mode)
• Brake light switch is turned ON. (Brake pedal is depressed)
• TCM detects the following DTCs.
P0712, P0713, P0717, P0722, P0962, P0963, P0973, P0974, P0976, P0977, P1702, P1703, P1774, P1777, P2763
and P2764
Troubleshooting
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.
Step
1 Was "A/T System Check" performed?
2 Check DTC
Is DTC P0712, P0713, P0717, P0722, P0962, P0963,
P0973, P0974, P0976, P0977, P1702, P1703, P1774,
P1777, P2763 or P2764 detected?
3 ECT check
1) Warm up engine to normal operating temperature.
2) Check ECT using scan tool.
Is ECT more than 60
4 4L/N switch signal inspection
1) With ignition switch ON, check voltage between terminal
"E92-4" of TCM connector and ground.
4L/N switch specification
Transfer gear position or "4H": Battery voltage
Transfer gear position "4L" or "N": 0 – 2 V
Is result as specified?
5 Brake light switch signal inspection
1) With ignition switch ON, check voltage between terminal
"E61-34" of ECM connector and ground.
Brake light switch specification
Brake pedal is released: 0 – 1 V
Brake pedal is depressed: Battery voltage
Is result as specified?
Action
° °
C (140 F)?
Yes
Go to Step 2.
Perform DTC Flow to
repair and retry.
• For vehicle equipped
with 4L/N switch, go
to Step 4.
• For vehicle equipped
without 4L/N switch,
go to Step 5.
Go to Step 5.
Substitute a known-
good TCM and recheck.
S5JB0E5104021
No
Go to "A/T System
Check: in related
manual".
Go to Step 3.
Faulty ECT sensor, its
circuit or engine cooling
system. If OK, substitute
a known-good TCM and
recheck.
Faulty "4L" switch or its
circuit. If OK, substitute
a known-good TCM and
recheck.
Mis-adjusted brake light
switch, faulty brake light
switch or its circuit. If
OK, substitute a known-
good TCM and recheck.