5A-21 Automatic Transmission/Transaxle:
No Lock-Up Occurs
S5JB0E5104021
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 Action Yes No
1 Was “A/T System Check” performed? Go to Step 2. Go to “A/T System
Check: in related
manual”.
2 Check DTC
Is DTC P0712, P0713, P0717, P0722, P0962, P0963,
P0973, P0974, P0976, P0977, P1702, P1703, P1774,
P1777, P2763 or P2764 detected?
Perform DTC Flow to
repair and retry.
Go to Step 3.
3 ECT check
1) Warm up engine to normal operating temperature.
2) Check ECT using scan tool.
Is ECT more than 60
°
C (140
°
F)?
• For vehicle equipped
with 4L/N switch, go
to Step 4.
• For vehicle equipped
without 4L/N switch,
go to Step 5.
Faulty ECT sensor, its
circuit or engine cooling
system. If OK, substitute
a known-good TCM and
recheck.
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?
Go to Step 5. Faulty “4L” switch or its
circuit. If OK, substitute
a known-good TCM and
recheck.
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?
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.
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