Toyota Tundra (2015 year). Manual — part 594
The ECM calculates the "actual" transmission gear by comparing the signals from the input speed sensor (NT) and
the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift solenoids, valve body,
transmission clutches, brakes, and gears. If the ECM detects that the actual gear position and the commanded
gear position are different, it will illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCs
P0781: Valve body/Functional check
Required sensors/Components
Valve body, Automatic transmission assembly
Duration
Condition (A) and (B)
0.4 seconds
Condition (C)
3 seconds
Condition (D)
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)
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
Condition (A)
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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)
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
Condition (B)
ECM selected gear
4th
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
Condition (C)
Current ECM selected gear
5th
Last ECM selected gear
4th
Vehicle speed (During transition from 4th to 5th gear)
Less than 100 km/h (62.2 mph)
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Condition (D)
ECM selected gear
5th
Engine speed -Turbine speed (NE - NT) (After transition to 5th gear)
150 rpm or less
Vehicle speed (After transition to 5th gear)
Less than 100 km/h (62.2 mph)
TYPICAL MALFUNCTION THRESHOLDS
Turbine speed/Output speed (NT/NO)
3.11 or more, and 7.58 or less
(This means actual gear is 1st)
Condition (B)
Turbine speed/Output speed (NT/NO)
1.24 or more, and 1.49 or less
(This means actual gear is 3rd)
Condition (C)
Turbine speed - Output speed x 4th gear ratio
(NT - NO x 4th gear ratio)
1000 rpm or more
Condition (D)
Turbine speed - Output speed x 5th gear ratio
(NT - NO x 5th gear ratio)
1000 rpm or more
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs
.
PROCEDURE
1.
CHECK DTC OUTPUT (IN ADDITION TO DTC P0781)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
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A
RESULT
PROCEED TO
Only P0781 is output
A
P0781 and other DTCs are output
B
HINT:
If any other codes besides P0781 are output, perform troubleshooting for those DTCs first.
B
GO TO DTC CHART
2.
PERFORM ACTIVE TEST USING TECHSTREAM (RUNNING TEST)
CAUTION:
This test should always be performed with at least 2 people.
NOTICE:
Perform the test at the normal operating ATF temperature: 50 to 80°C (122 to 176°F).
Perform the test with the A/C turned off.
HINT:
Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early
in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.
(a) Connect the Techstream to the DLC3.
(b) Clear the DTC
.
(c) Warm up the engine.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test.
(e) According to the display on the Techstream, perform the Active Test.
HINT:
While driving, the shift position can be forcibly changed with the Techstream.
Comparing the shift position commanded by the Active Test with the actual shift position enables you to
confirm the problem
.
Engine and ECT:
TESTER
DISPLAY
TEST PART
CONTROL RANGE
DIAGNOSTIC NOTE
Control the Shift
Position
Operate shift solenoid valve
and set each shift position
Press "→" button:
Shift up
Possible to check operation of
shift solenoid valves
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