Suzuki WagonR+ RB310 Service Manual page 1419

7B-8 AUTOMATIC TRANSMISSION (4 A/T)
Fail safe function
This function is provided by the safe mechanism that assures safe driveability even when the solenoid valve,
sensor or its circuit fails.
The table below shows the fail safe function for each fail condition of sensor, solenoid or its circuit.
Area
Input/Turbine
speed sensor cir-
cuit
(DTC P0715)
Output shaft speed
sensor circuit
(DTC P0720)
Shift solenoid
(DTC P0753)
(DTC P0758)
(DTC P0763)
(DTC P0768)
(DTC P0773)
TCC circuit
(DTC P0743)
Detecting condition
Input shaft speed • When vehicle running and in shift change by automatic elec-
sensor signal voltage
is too high or too low.
• When vehicle running and in no shift change, gear is fixed to
Output shaft speed
sensor signal voltage
is too high or too low. • When vehicle is at stop after or during detecting trouble, or in
• Solenoid output • When select lever is "P", "R", "N", "D" or "2" range, A/T sole-
voltage is too high
although TCM
orders solenoid to
turn off. • When select lever is "2" range, gear is fixed to pre pro-
• Solenoid output
voltage is too low
although TCM
orders solenoid to
turn on.
• When select lever is "L" range, gear is fixed to pre pro-
Lock-up function is turned OFF.
Fail safe function
tronic control, gear is fixed to gear which is going to be
selected and lock-up function is turned OFF.
gear right before the trouble occurred and lock-up function is
turned OFF.
shift change by manual operation while running, gear is fixed
as the followings and lock-up function is turned OFF.
"P" range → P, "R" range → R, "N" range → N,
"D" range → 3rd, "2" range → 2nd, "L" range → 1st
noid power relay is turned OFF and gear is fixed as follows :
"P" range → P, "R" range → R, "N" range → N,
"D" range → 3rd
grammed gear position of several patterns as follows :
– Malfunction of No.1 solenoid → 3rd
– Malfunction of No.2 solenoid → 3rd
– Malfunction of No.3 solenoid → 2nd
– Malfunction of No.4 solenoid → 1st or 2nd
– Malfunction of No.5 solenoid → 2nd or 3rd
– Malfunction of 2 or more solenoids → 3rd
grammed gear position of several patterns as follows :
– Malfunction of No.1 solenoid → 3rd
– Malfunction of No.2 solenoid → 1st
– Malfunction of No.3 solenoid → 2nd
– Malfunction of No.4 solenoid → 1st or 2nd
– Malfunction of No.5 solenoid →1st
– Malfunction of 2 or more solenoids → 3rd