Toyota Tundra (2015 year). Manual — part 593

OK

1.

INSPECT NO. 2 TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)

(a) Disconnect the D64 No. 2 transmission wire connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

2 (SL2+) - 4 (SL2-)

20°C (68°F)

5.0 to 5.6 Ω

2 (SL2+) - Body ground

Always

10 kΩ or higher

4 (SL2-) - Body ground

Always

10 kΩ or higher

NG

GO TO STEP 3

2.

CHECK HARNESS AND CONNECTOR (NO. 2 TRANSMISSION WIRE - ECM)

AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...

(a) Disconnect the D74 ECM connector.

(b) Measure the resistance according to the value(s) in the table

below.

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED

CONDITION

D74-12 (SL2+) - D74-13

(SL2-)

20°C

(68°F)

5.0 to 5.6 Ω

D74-12 (SL2+) - Body ground

Always

10 kΩ or higher

D74-13 (SL2-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE ECM

3.

INSPECT SHIFT SOLENOID VALVE SL2

(a) Remove shift solenoid valve SL2.

(b) Measure the resistance according to the value(s) in the table

below.

Standard resistance:

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

1 - 2

20°C (68°F)

5.0 to 5.6 Ω

(c) Connect the battery's positive (+) lead with a 21 W bulb to

Valve moves and makes an operating noise.

NG

REPLACE SHIFT SOLENOID VALVE SL2

AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...

OK

REPAIR OR REPLACE NO. 2 TRANSMISSION WIRE

AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000000XP10BLX

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0781; 1-2 Shift (1-2 Shift

Valve); 2015 MY Tundra [08/2014 - ]

DTC

P0781

1-2 Shift (1-2 Shift Valve)

DESCRIPTION

The 1-2 shift valve performs shifting to 1st gear and other gears. When shifting to 2nd and 4th gears is

impossible, or when the ECM directs the transmission to switch to 5th and 6th gear and the engine overruns

(clutch slips), this DTC is output.

DTC

CODE

DTC DETECTION CONDITION

TROUBLE AREA

P0781

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

4th gear, the actual gear is shifted to 3rd.

(c) When the ECM directs the transmission to switch to

5th gear, the engine overruns (clutch slips).

Valve body is blocked up or

stuck (1-2 shift 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

1st

3rd

3rd

N*

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.

Gear position under normal conditions

1st

2nd

3rd

4th

5th

6th

Actual gear position under fail-safe mode

1st*

1st*

3rd

3rd

3rd

3rd

HINT:

1st*: Under engine braking, downshifting to 1st or 2nd gear is prohibited.

MONITOR DESCRIPTION

This DTC indicates that the 1-2 shift valve in the valve body is locked in the direction the spring compresses.

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to the

valves in the valve body.

AB60E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMIS...