Toyota Tundra (2015 year). Manual — part 581
OK
NG
REPLACE STOP LIGHT SWITCH
2.
CHECK HARNESS AND CONNECTOR (BATTERY - ECM)
(a) Disconnect the A24 ECM connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
A24-36 (STP) - Body ground
Brake pedal is depressed
11 to 14 V
A24-36 (STP) - Body ground
Brake pedal is released
Below 1 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000W8I076X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AB60E 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 gearshift 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 also 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 up or
stuck (sequence valve)
Shift solenoid valve SLT
remains open or closed
Automatic transmission
(clutch, brake or 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.
The DTC indicates that the sequence valve is locked in the direction the spring stretches and that shifting to the
6th gear is impossible.
MONITOR STRATEGY
AB60E 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)
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
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
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
Condition (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)
Condition (B)
ECM selected gear
6th
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)
TYPICAL MALFUNCTION THRESHOLDS
Turbine speed/Output speed (NT/NO)
0.66 or more, and 0.80 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
RESULT
PROCEED TO
AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...
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