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5A-18 Automatic Transmission/Transaxle:
Fail Safe Table
This function is provided by the safe mechanism that assures safe driveability even when the solenoid valve, sensor or
its circuit fails. The following table shows the fail safe function for each fail condition of sensor, solenoid, TCM or its
circuit.
DTC No.
21
Shift solenoid valve-A or its
P0753
22
circuit
23
Shift solenoid valve-B or its
P0758
24
circuit
41
Pressure control solenoid valve
P0748
42
or its circuit
P1702
52
TCM
25
P0743
TCC solenoid valve or its circuit
26
Transmission range sensor or
P0705
34
its circuit
36
Transmission fluid temperature
P0710
38
sensor or its circuit
Input shaft speed sensor or its
P0715
37
circuit
Output shaft speed sensor or
P0720
31
its circuit
P0725
35
Engine speed signal circuit
32
P1700
Throttle position signal circuit
33
P1730
64
Engine torque signal circuit
Engine coolant temperature
P1705
51
signal circuit
P1895
27
Torque reduction signal circuit
Trouble area
• Power supply to shift solenoid valve, TCC solenoid valve and
• Gear position is fixed as shown below.
• Lock-up function is inhibited to operate. (Except P1702)
• Lock-up function is inhibited to operate.
• Up-shift to 4th gear is inhibited when A/T fluid temperature is
• When TCC solenoid valve circuit open or shorted to power
• In case of circuit open, selected range is set as "D" range.
• In case of circuit short (In case that 2 or more sensor signals
Line pressure raising control at low fluid temperature is
inhibited.
• Power supply to shift solenoid valve and TCC solenoid valve
• Gear position is fixed as shown below.
• Lock-up function is inhibited to operate.
• Reverse control operation, which inhibit reverse driving at "R"
• Power supply to shift solenoid valve and TCC solenoid valve
• Gear position is fixed as shown below.
• Lock-up function is inhibited to operate.
• Torque reducing requirement to ECM (torque reduction
Engine coolant temperature is assumed as normal operating
temperature, and controls of overdrive and lock-up is released
from inhibition.
Torque reducing requirement to ECM (torque reduction control)
is inhibited.
Fail safe operation
pressure control solenoid valve is cut.
– When select lever position is
R: Reverse
D: 4th (O/D)
2: 3rd
L: 1st
150 °C (302 °F) or higher.
circuit, and vehicle speed is less than 10 km/h (6 mile/h),
gear position is fixed in 1st gear for prevention of engine stall.
are inputted), selected range is set in priority order shown
below.
N> R> L> 2> D> P
is cut.
– When select lever position is
R: Reverse
D: 4th (O/D)
2: 3rd
L: 1st
range while vehicle runs forward more than 7 km/h (4 mile/h),
is inhibited.
is cut.
– When select lever position is
R: Reverse
D: 4th (O/D)
2: 3rd
L: 1st
control) is inhibited.
S3RH0B5104008
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