Toyota Tundra. Manual — part 2831

Fig. 85: Identifying D74 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See ECM )

3. INSPECT SHIFT SOLENOID VALVE S1

a. Remove shift solenoid valve S1.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

c. Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the

negative (-) lead to the solenoid valve body. Then check that the valve moves and makes an
operating noise.

OK: Valve moves and makes an operating noise.

Tester Connection

Condition

Specified

Condition

Shift solenoid valve S1 connector terminal - Shift solenoid valve
S1 body

20°C (68°

F)

11 to 15 ohms

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 86: Identifying Shift Solenoid Valve S1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE SHIFT SOLENOID VALVE S1 (See DISASSEMBLY )

OK: REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (See REMOVAL )

DTC P0976, P0977: SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE
S2); SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2)

DESCRIPTION

Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves
SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of
the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be
operated safely. Also, the ECM stops sending current to the open or short circuited solenoid (see FAIL-SAFE
TABLE ).

DTC DETECTION CONDITION TABLE

DTC

Code

DTC Detection Condition

Trouble Area

P0976

ECM detects short in solenoid valve S2 circuit 2 times when
solenoid valve S2 is operated (1 trip detection logic)



Short in shift solenoid
valve S2 circuit



Shift solenoid valve S2



ECM

P0977

ECM detects open in solenoid valve S2 circuit 2 times when
solenoid valve S2 is not operated (1 trip detection logic)



Open in shift solenoid
valve S2 circuit



Shift solenoid valve S2



ECM

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S2 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the
DTC. When the shift solenoid valve S2 is ON, if its resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve S2 circuit.

When the shift solenoid valve S2 is OFF, if its resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S2 circuit (see FAIL-SAFE TABLE ).

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

P0976: Range Check (Low Resistance)

TYPICAL ENABLING CONDITIONS TABLE

P0977: Range Check (High Resistance)

TYPICAL ENABLING CONDITIONS TABLE

TYPICAL MALFUNCTION THRESHOLDS

P0976: Range Check (Low Resistance)

TYPICAL MALFUNCTION THRESHOLDS TABLE

Related DTCs

P0976: Shift solenoid valve S2/Range check (Low
resistance)
P0977: Shift solenoid valve S2/Range check (High
resistance)

Required sensors/Components

Shift solenoid valve S2

Frequency of operation

Continuous

Duration

0.128 sec. or more

MIL operation

1 driving cycle

Sequence of operation

None

The monitor will run whenever the following DTCs are not stored

None

Shift solenoid valve S2

ON

Shift solenoid valve S2

OFF

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

P0977: Range Check (High Resistance)

TYPICAL MALFUNCTION THRESHOLDS TABLE

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE TABLE

WIRING DIAGRAM

Fig. 87: Identifying Shift Solenoid Valve S2 - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

The shift solenoid valve S2 is turned ON/OFF normally when the shift lever is on D:

SHIFT SOLENOID VALVE S2 REFERENCE TABLE

1. INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)

a. Disconnect the D63 No. 1 transmission wire connector.

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

Shift solenoid valve S2 resistance

8 ohms or less

Shift solenoid valve S2 resistance

100 kohms or higher

Shift solenoid valve S2 resistance

11 to 15 ohms at 20°C (68°F)

ECM gear shift command

1st

2nd

3rd

4th

5th

6th

Shift solenoid valve S2

ON

ON

OFF

OFF

OFF

ON

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra