Torque Converter Interlock Troubleshooting; Cannot Travel (Torque Converter Interlock); The Torque Converter Interlock Does Not Operate - Toyota 8FGU15 Repair Manual

8-186
Control type
Torque converter in-
terlock
Phenomenon on Malfunction area
vehicle and mode
Cannot travel.
The torque converter
interlock does not
operate.
Checking method
▪ Torque con-
verter interlock
relay main unit
for forward
movement:
An open circuit
(internal dam-
age)
▪ Torque con-
verter interlock
relay main unit
-
for backward
movement:
An open circuit
(internal dam-
age)
▪ Relay secondary
line:
An open circuit
(harnesses, con-
nectors)
▪ SAS/OPS con-
troller:
-
Internal damage
▪ SAS/OPS con-
troller is set:
-
Option set is not
set
▪ Torque con-
verter interlock
relay main unit
for forward
movement:
An open circuit
(internal dam-
age)
▪ Torque con-
verter interlock
-
relay main unit
for backward
movement:
An open circuit
(internal dam-
age)
▪ Relay secondary
line:
Frame short
(harnesses)
▪ SAS/OPS con-
troller:
-
Internal damage
8 TROUBLESHOOTING
Corrective action
Check the har-
nesses.
If the vehicle cannot
travel forward, re-
place the torque
converter interlock
relay for forward
movement.
If the vehicle cannot
travel backward, re-
place the torque
converter interlock
relay for backward
movement.
Replace the control-
ler.
Set the controller
again according to
the option set pro-
cedure.
Check the har-
nesses.
If the vehicle cannot
travel forward, re-
place the torque
converter interlock
relay for forward
movement.
If the vehicle cannot
travel backward, re-
place the torque
converter interlock
relay for backward
movement.
Replace the control-
ler.