Toyota Tundra. Manual — part 2813
DTC DETECTION CONDITION TABLE
HINT:
Gear positions in the event of a solenoid valve mechanical problem:
GEAR SHIFT POSITIONS TABLE
Gear position during fail-safe operation:
If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear positions as
shown in the table below.
GEAR SHIFT POSITIONS TABLE
DTC
Code
DTC Detection Condition
Trouble Area
P0751
S1 stuck ON malfunction*1:
The ECM determines there is a malfunction when the
following conditions are both met. (2-trip detection logic)
a. When the ECM directs the transmission to switch to
1st gear, the actual gear is shifted to 2nd.
b. When the ECM directs the transmission to switch to
5th gear, the actual gear is also shifted to 5th.
Shift solenoid valve S1
remains open
Valve body is blocked
Automatic transmission
(clutch, brake, gear, etc.)
P0751
S1 stuck OFF malfunction*2:
The ECM determines there is a malfunction when conditions
(a) and (b), or (a) and (c) are met. (2-trip detection logic)
a. When the ECM directs the transmission to switch to
2nd gear, the actual gear is shifted to 1st.
b. When the ECM directs the transmission to switch to
5th gear, the actual gear is also shifted to 5th.
c. When the ECM directs the transmission to switch to
6th gear, the engine overruns (clutch slips).
Shift solenoid valve S1
remains closed
Shift solenoid valve SLT
remains open or closed
Valve body is blocked
No. 2 brake malfunction
(driving is difficult)
Automatic transmission
(clutch, brake, gear, etc.)
ECM gear shift command
1st 2nd 3rd 4th 5th 6th
*1: Actual gear position under S1 stuck ON malfunction 2nd 2nd 3rd 4th 5th 6th
*2: Actual gear position under S1 stuck OFF malfunction 1st 1st 3rd 4th 5th
(1)
(1)
Neutral
Gear position under normal conditions
1st
2nd 3rd 4th 5th 6th
*1: Actual gear position under fail-safe mode when S1 stuck ON malfunction
2nd 2nd 3rd 4th 5th 6th
*2: Actual gear position under fail-safe mode when S1 stuck OFF
malfunction
1st
(1)
1st
(1)
3rd 3rd 3rd 3rd
(1)
Under engine braking, downshifting to 1st or 2nd gear is prohibited.
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
MONITOR DESCRIPTION
This DTC indicates "stuck ON malfunction" or "stuck OFF malfunction" of the shift solenoid valve S1. The
ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When the gear position
commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
ALL
TYPICAL ENABLING CONDITIONS TABLE
Related DTCs
P0751: Shift solenoid valve S1/OFF malfunction,
Shift solenoid valve S1/ON malfunction
Required sensors/Components
Shift solenoid valve S1, Speed sensor (NT), Speed
sensor (NC), Crankshaft position sensor (NE),
Throttle position sensor MAF
Frequency of operation
Continuous
Duration
OFF malfunction (A), (B) and ON malfunction (A),
(B)
0.4 sec.
OFF malfunction (C)
3 sec.
OFF malfunction (D)
1 sec.
MIL operation
2 driving cycles
Sequence of operation
None
The monitor will run whenever the following DTCs
are not stored
P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for Closed Loop)
P0500 (VSS)
P0748 - P0798 (Trans solenoid (range))
Turbine speed sensor circuit
Not circuit malfunction
Output speed sensor circuit
Not circuit malfunction
Shift solenoid valve S1 circuit
Not circuit malfunction
Shift solenoid valve S2 circuit
Not circuit malfunction
Shift solenoid valve S3 circuit
Not circuit malfunction
Shift solenoid valve S4 circuit
Not circuit malfunction
Shift solenoid valve SR circuit
Not circuit malfunction
Shift solenoid valve SL1 circuit
Not circuit malfunction
Shift solenoid valve SL2 circuit
Not circuit malfunction
ECT (Engine Coolant Temperature) sensor circuit
Not circuit malfunction
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
TYPICAL ENABLING CONDITIONS TABLE
OFF malfunction (A)
TYPICAL ENABLING CONDITIONS TABLE
OFF malfunction (B)
TYPICAL ENABLING CONDITIONS TABLE
OFF malfunction (C)
TYPICAL ENABLING CONDITIONS TABLE
OFF malfunction (D)
KCS sensor circuit
Not circuit malfunction
ETCS (Electric Throttle Control System)
Not system down
Transmission position
D
Duration time from shifting N to D
4 sec. or more
ECT
40°C (104°F) or higher
Spark advance from max. retard timing by KCS
control
0° crankshaft angle or more
Engine
Starting
Transfer position
HIGH*
HINT:
*: Following conditions met
Vehicle speed sensor circuit
Not circuit malfunction
Output shaft speed sensor circuit
Not circuit malfunction
Transfer output speed
143 RPM or more
Transfer input speed/Transfer output speed
(NO/NOtf)
0.9 or more, and less than 1.1
ECM selected gear
5th
Vehicle speed
2 km/h (1.2 MPH) or more
Throttle valve opening angle
9% or more at 2000 RPM (Conditions vary with engine speed)
ECM selected gear
2nd
Vehicle speed
2 km/h (1.2 MPH) or more
Output speed
2nd --> 1st down-shift point or more
Throttle valve opening angle
9% or more at 2000 RPM (Conditions vary with engine speed)
Current ECM selected gear
6th
Last ECM selected gear
5th
Vehicle speed (During transition from 5th to 6th
gear)
Less than 100 km/h (62.2 MPH)
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
TYPICAL ENABLING CONDITIONS TABLE
ON malfunction (A)
TYPICAL ENABLING CONDITIONS TABLE
ON malfunction (B)
TYPICAL ENABLING CONDITIONS TABLE
TYPICAL MALFUNCTION THRESHOLDS
[OFF malfunction]
When both of the following conditions are met: OFF malfunction (A) and OFF malfunction (B), (C) or (D)
OFF malfunction (A)
TYPICAL MALFUNCTION THRESHOLDS TABLE
OFF malfunction (B)
TYPICAL MALFUNCTION THRESHOLDS TABLE
OFF malfunction (C)
TYPICAL MALFUNCTION THRESHOLDS TABLE
OFF malfunction (D)
TYPICAL MALFUNCTION THRESHOLDS TABLE
ECM selected gear
6th
Engine speed-Turbine speed (NE-NT) (After
transition from 5th to 6th gear)
150 RPM or less
Vehicle speed (After transition from 5th to 6th gear)
Less than 100 km/h (62.2 MPH)
ECM selected gear
1st
Vehicle speed
2 km/h (1.2 MPH) or more, and less than 40 km/h (24.9 MPH)
Engine speed-Turbine speed (NE-NT)
50 RPM or more
ECM selected gear
5th
Vehicle speed
2 km/h (1.2 MPH) or more
Throttle valve opening angle
9% or more at 2000 RPM (Conditions vary with engine speed)
Turbine speed/Output speed (NT/NO)
0.66 or more, and 0.80 or less (This means actual gear is 5th)
Turbine speed/Output speed (NT/NO)
3.11 or more, and 7.58 or less (This means actual gear is 1st)
Turbine speed-Output speed x 5th gear ratio (NT-NO x 5th
gear ratio)
1000 RPM or more
2009 Toyota Tundra
2009 TRANSMISSION AB60F Automatic Transaxle - Tundra
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