Toyota Tundra (2015 year). Manual — part 340
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000W8I073X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0729; Gear 6 Incorrect
Ratio; 2015 MY Tundra [08/2014 - ]
DTC
P0729
Gear 6 Incorrect Ratio
DESCRIPTION
The ECM uses signals from the output speed sensor SP2 and input speed sensor NT 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
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0729
6th gear shift malfunction:
The ECM determines there is a malfunction when both
(a) When the ECM directs the transmission to switch to 5th
gear, the actual gear is shifted to 5th.
(b) When the ECM directs the transmission to switch to 6th
gear, the actual gear is shifted to 4th.
Valve body is blocked or
stuck (sequence valve)
Shift solenoid valve SLT
remains open or closed
Automatic transmission
(clutch, brake, gear, etc.)
HINT:
1st
2nd
3rd
4th
5th
6th
Actual gear position under malfunction
1st
2nd
3rd
4th
5th
4th
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 position under normal conditions
1st
2nd
3rd
4th
5th
6th
Actual gear position under fail-safe mode
1st
2nd
3rd
3rd
3rd
3rd
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF and switching oil pressure to the
valves in the valve body.
This DTC indicates that the sequence valve is locked in the direction the spring stretches and that shifting to 6th
gear is impossible.
MONITOR STRATEGY
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Related DTCs
P0729: Gear 6 incorrect ratio (Sequence valve) / Functional check
Required sensors/Components
Sequence valve
Duration
0.4 seconds
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)
P0500 (Output speed sensor circuit)
P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D
(KCS sensor circuit)
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
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
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
3.30 to 7.50
or
1.91 to 2.35
or
1.28 to 1.53
or
0.93 to 1.07
or
0.65 to 0.79
or
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
0.51 to 0.65
Condition (A)
ECM selected gear
5th
Vehicle speed
2 km/h (1.2 mph) or more
Throttle valve opening angle
6.6% or more at 2000 rpm
(Conditions vary with engine speed)
Condition (B)
ECM selected gear
6th
Vehicle speed
2 km/h (1.2 mph) or more
Throttle valve opening angle
6.6% or more at 2000 rpm
(Conditions vary with engine speed)
TYPICAL MALFUNCTION THRESHOLDS
Turbine speed / Output speed (NT / NO)
0.65 or more, and 0.79 or less
(This means actual gear is 5th)
Condition (B)
Turbine speed / Output speed (NT / NO)
0.93 or more, and 1.07 or less
(This means actual gear is 4th)
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs
.
PROCEDURE
1.
CHECK DTC OUTPUT (IN ADDITION TO DTC P0729)
(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
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
A
RESULT
PROCEED TO
Only P0729 is output
A
P0729 and other DTCs are output
B
HINT:
If any other codes besides P0729 are output, perform troubleshooting for those DTCs first.
B
GO TO DTC CHART
2.
PERFORM ACTIVE TEST USING TECHSTREAM (RUNNING TEST)
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) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test.
(g) According to the display on the Techstream, perform the Active Test.
HINT:
While driving, the shift position can be forcibly changed with the Techstream.
Engine and ECT
TESTER
DISPLAY
TEST PART
CONTROL RANGE
DIAGNOSTIC NOTE
Control the
Shift Position
Operate shift solenoid valves
and set each shift position
Press "→"
button: Shift up
Press "←"
button: Shift
down
Possible to check operation of
the shift solenoid valves.
[Vehicle Condition]
50 km/h (30 mph) or less
HINT:
A760E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст