Toyota Tundra (2015 year). Manual — part 584
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REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000W8J0E0X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0751; Shift Solenoid "A"
Performance (Shift Solenoid Valve S1); 2015 MY Tundra [08/2014 - ]
DTC
P0751
Shift Solenoid "A" Performance (Shift Solenoid Valve S1)
DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear
position (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
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 closed
Valve body is blocked
Automatic transmission
(clutch, brake or gear, etc.)
P0751
S1 stuck OFF malfunction*2:
The ECM determines there is a malfunction when
conditions (a) and (b) are met. (2-trip detection logic)
(a) When the ECM directs the transmission to switch to 5th
gear, the actual gear is also shifted to 5th.
(b) When the ECM directs the transmission to switch to 6th
gear, the engine overruns (clutch slips).
Shift solenoid valve S1
remains open
Shift solenoid valve SLT
remains open or closed
Valve body is blocked
No. 2 brake malfunction
(Driving is difficult.)
Automatic transmission
(clutch, brake or gear, etc.)
HINT:
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
N*
N*: Neutral
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.
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
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*3 1st*3 3rd 3rd 3rd 3rd
*3: Under engine braking, downshifting to 1st or 2nd gear is prohibited.
MONITOR DESCRIPTION
commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.
MONITOR STRATEGY
Related DTCs
P0751: Shift solenoid valve S1/Functional check
Required
sensors/Components
Shift solenoid valve S1, Speed sensor (NT), Speed sensor (SP2), Crankshaft
position sensor (NE), Throttle position sensor, MAF
Duration
OFF malfunction (A) and ON malfunction (A), (B)
0.4 seconds
OFF malfunction (B)
3 seconds
OFF malfunction (C)
1 second
MIL operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
All
The monitor will run whenever the following
DTCs are not present
P0717 (Turbine speed sensor circuit)
P0722 (Output speed sensor circuit)
P0973, P0974 (Shift solenoid valve S1 circuit)
P0976, P0977 (Shift solenoid valve S2 circuit)
P0979, P0980 (Shift solenoid valve S3 circuit)
P0982, P0983 (Shift solenoid valve S4 circuit)
P0985, P0986 (Shift solenoid valve SR circuit)
P0748 (Shift solenoid valve SL1 circuit)
P0778 (Shift solenoid valve SL2 circuit)
P0115, P0116, P0117, P0118, P011B (ECT (Engine coolant
temperature) sensor circuit)
P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D
(KCS sensor circuit)
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
ETCS (Electric Throttle Control System)
Not system down
Transmission position
"D"
Duration time from shifting "N" to "D"
4 seconds 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
OFF Malfunction (A)
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)
Calculated load value
7.75% or more (A/C off)
7.75% or more (A/C on)
Input speed/output speed (NT/NO)
NT: Input (Turbine) speed
NO: Internal counter shaft speed
3.11 to 7.58
or
1.83 to 2.27
or
1.24 to 1.49
or
0.93 to 1.07
or
0.66 to 0.80
or
0.51 to 0.65
OFF Malfunction (B)
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)
OFF Malfunction (C)
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)
ON Malfunction (A)
ECM selected gear
1st
Vehicle speed
2 km/h (1.2 mph) or more and less than 40 km/h (24.9 mph)
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
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