Toyota Tundra. Manual — part 2825

This DTC indicates that the signal indicating that the transfer is in neutral remains on.

DTC DETECTION CONDITION TABLE

MONITOR DESCRIPTION

The ECM detects whether or not the transfer is in neutral by monitoring the signal from the transfer shift
actuator assembly.

If the ECM detects that the transfer is in neutral under the following conditions, the ECM will conclude that
there is a malfunction of the transfer shift actuator assembly, illuminate the MIL and store the DTC:



The transfer shift actuator assembly indicates that the transfer is in neutral.



The transfer position switch is in the "4H" position.



The vehicle is being driven at 25 km/h (16 MPH) or more.



The transfer neutral signal has been ON for more than 30 seconds.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS TABLE

DTC

Code

DTC Detection Condition

Trouble Area

P0818

The signal indicating that the transfer is in neutral remains ON
while vehicle is running under following conditions for 30 sec. (2
trip detection logic):



Vehicle speed is 25 km/h (16 MPH) or more



Transfer position switch is in 4H



Short in transfer neutral
position switch circuit



Transfer shift actuator
assembly (transfer
system)



ECM

Related DTCs

P0818: Transfer neutral position switch/Verify
switch cycling

Required sensors/Components

Transfer neutral position switch, Vehicle speed

sensor

Frequency of operation

Continuous

Duration

30 sec.

MIL operation

2 driving cycles

Sequence of operation

None

The monitor will run whenever the following DTCs
are not stored

None

Vehicle speed

25 km/h (15.54 MPH) or more

Transfer position

High

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS TABLE

WIRING DIAGRAM

Fig. 71: Identifying Driveline Disconnect Switch Input - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR - BODY GROUND)

a. Disconnect the D68 transfer shift actuator connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Result

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

Transfer neutral signal

ON

Tester Connection

Condition Specified Condition

D68-3 (N) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

RESULT REFERENCE TABLE

Fig. 72: Identifying D68 Transfer Shift Actuator Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

B: GO TO TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM (See ON-VEHICLE INSPECTION )

A: Go to next step.

2. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - BODY GROUND)

a. Disconnect the A25 4WD control ECU connector.

b. Disconnect the D68 transfer shift actuator connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Result

RESULT REFERENCE TABLE

Result Proceed to

NG

A

OK

B

Tester Connection

Condition Specified Condition

A25-16 (NP) - Body ground Always

10 kohms or higher

Result

Proceed to

NG

A

OK (for 3UR-FE)

B

OK (for 3UR-FBE)

C

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 73: Identifying A25 4WD Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

B: OK (for 3UR-FE) (See REMOVAL )

C: OK (for 3UR-FBE) (See REMOVAL

A: Go to next step.

3. CHECK HARNESS AND CONNECTOR (TRANSFER SHIFT ACTUATOR, 4WD CONTROL

ECU - ECM)

a. Disconnect the A24 ECM connector.

b. Disconnect the D68 transfer shift actuator connector.

c. Disconnect the A25 4WD control ECU connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Result

RESULT REFERENCE TABLE

Tester Connection

Condition Specified Condition

A24-5 (TFN) - Body ground Always

10 kohms or higher

Result Proceed to

OK

A

NG

B

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra