Toyota Sequoia (2005). Manual - part 222

D14166

ECM:

SLU+

SLU–

E8

E7

E6

E5

E4

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–683

877

2

Check harness and connector (Transmission wire – ECM)

PREPARATION:
(a)

Connect the transmission wire connector.

(b)

Disconnect the ECM connector.

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

20



C (68



F)

E7 – 15 (SLU+) – E7 – 14 (SLU–)

5.0 to 5.6 

Ω

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

E7 – 15 (SLU+) – Body ground

10 k

Ω

 or higher

E7 – 14 (SLU–) – Body ground

↑

NG

Repair or replace the harness or connector
(See page 

IN–35

).

OK

Replace the ECM (See page 

SF–80

).

D12795

1

2

(–)

(+)

1

2

Shift Solenoid Valve SLU:

DI–684

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

878

3

Inspect shift solenoid valve SLU.

PREPARATION:
Remove the shift solenoid valve SLU (See page 

AT–10

).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

20



C (68



F)

1 – 2

5.0 to 5.6 

Ω

CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (–) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:

The solenoid makes an operating sound.

 

NG

Replace the shift solenoid valve SLU
(See page 

AT–10

).

OK

Repair or replace the transmission wire
(See page 

AT–7

).

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–685

879

DTC

P2772

Transfer L4 SW Circuit

CIRCUIT DESCRIPTION

The ECM detects the signal from the transfer L4 position switch.
This DTC indicates that the transfer L4 position switch remains ON.

DTC No.

DTC Detecting Condition

Trouble Area

P2772

Transfer L4 position switch remains ON while vehicle running

under conditions for 18 seconds or more (1–trip detection log-

ic)

(a) Output shaft speed 3000 rpm or less

(b) Transfer shift position is H

Short in transfer L4 position switch circuit

Transfer L4 position switch

4WD control ECU

ECM

MONITOR DESCRIPTION

The ECM monitors the transfer–case L4 position switch to determine when the transfer–case L4 gear is en-
gaged. If the transfer–case L4 gears remain engaged under the following conditions, the ECM will conclude
that there is a malfunction of the L4 position switch:

L4 switch indicated that the L4 transfer–case gears are engaged.

Transfer–case shifter is in the ”H” position.

Transfer–case output shaft rpm is between 750 and 3,000 rpm.

The specified time period has elapsed.

If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the L4 switch,
and illuminate the MIL and store the DTC.

MONITOR STRATEGY

Related DTCs

P2772

Transfer L4 position switch/ON malfunction

Required sensors/Components

Transfer L4 position switch

Frequency of operation

Continuous

D

ti

ON malfunction (A)

1.8 sec.

Duration

ON malfunction (B)

0.5 sec.

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

All:

Output speed sensor circuit

Not circuit malfunction

Vehicle speed sensor circuit

Not circuit malfunction

Transfer neutral position switch

OFF

ON malfunction (A)

Output speed (Transfer output speed)

1,000  to 3,000 rpm

ON malfunction (B)

Output speed (Transfer output speed)

143 rpm or more

–

DIDJQ–01

D14217

ECM

L4

E6

F23

24

IG4

10

L–R*

L–R*

4WD Control ECU

*: 4WD

L4

13

DI–686

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

880

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

Both of the following conditions is met: ON malfunctions (A) and (B)

ON malfunction (A)

L4 switch

ON

ON malfunction (B)

Actual Transfer gear ratio 

Transfer input speed/Transfer output speed

0.9 to 1.1

WIRING DIAGRAM