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Toyota Tundra. Manual - part 2795
a. Fail-safe operation for electronically malfunctioning shift solenoid valve (S1, S2, S3, S4 and SR).
1. Fail-safe function
If any of the shift solenoid valve circuits has an open or short failure, the ECM turns the
other shift solenoids "ON" and "OFF" in order to shift into the gear positions shown in the
table below. Also, the ECM stops sending current to the open or short circuited solenoid.
Even if starting the engine again in the fail-safe mode, the gear position remains in the same
position.
HINT:
*: Actual gear shift (gear position) under fail-safe operation.
X: OFF (the ECM stops sending current to the malfunctioning solenoid valve).
Electrical malfunction: Condition is shown to the left of the "-->".
Fail-safe mode: Condition is shown to the right of the "-->".
E/B: Engine brake
Shift Solenoid Valve S1 Electrical Malfunction (P0973, P0974):
SHIFT SOLENOID VALVE S1 ELECTRICAL MALFUNCTION TABLE
Shift
lever
position
Gear*
Shift
solenoid
S1
Shift
solenoid
S2
Shift
solenoid
S3
Shift
solenoid
S4
Shift
solenoid
SR
Shift
solenoid
SL1
Shift
solenoid
SL2
D, S6
1st
X
ON
ON
OFF
ON
OFF
ON
1st -->
4th
X
ON -->
OFF
ON -->
OFF
OFF
ON
OFF
ON
3rd -->
4th
X
OFF
ON -->
OFF
OFF
ON
OFF
ON
4th
X
OFF
OFF
OFF
ON
OFF
ON
5th
X
OFF
OFF
ON
OFF
ON
OFF
N -->
5th
X
ON -->
OFF
OFF
ON
OFF
ON
OFF
S5
1st
X
ON
ON
OFF
ON
OFF
ON
1st -->
4th
X
ON -->
OFF
ON -->
OFF
OFF
ON
OFF
ON
3rd -->
4th
X
OFF
ON -->
OFF
OFF
ON
OFF
ON
4th
X
OFF
OFF
OFF
ON
OFF
ON
5th
X
OFF
OFF
ON
OFF
ON
OFF
S4
1st
X
ON
ON
OFF
ON
OFF
ON
1st -->
4th
X
ON -->
OFF
ON -->
OFF
OFF
ON
OFF
ON
3rd -->
ON -->
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra