Toyota Sequoia (2005). Manual - part 203

D12795

1

2

(–)

(+)

1

2

Shift Solenoid Valve SL1:

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–607

801

3

Inspect shift solenoid valve SL1.

PREPARATION:
Remove the shift solenoid valve SL1 (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 SL1
(See page 

AT–10

).

OK

Repair or replace the transmission wire
(See page 

AT–7

).

DI–608

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

802

DTC

P0751

Shift Solenoid ”A” Performance 
(Shift Solenoid Valve S1)

SYSTEM DESCRIPTION

The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear
position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).

DTC No.

DTC Detection Condition

Trouble Area

P0751

The gear required by the ECM does not match the actual gear

when driving (2–trip detection logic)

Shift solenoid valve S1 remains open or closed

Valve body is blocked

Automatic transmission (clutch, brake or gear, etc.)

MONITOR DESCRIPTION

This DTC indicates ”stuck ON malfunction” or ”stuck OFF malfunction” of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves ”ON/OFF”. When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.

MONITOR STRATEGY

R l t d DTC

P0751

Shift solenoid valve S1/OFF malfunction

Related DTCs

P0751

Shift solenoid valve S1/ON malfunction

Main

Shift solenoid valve S1

Required sensors/Components

Sub

Vehicle speed sensor, Throttle position sensor, Speed sensor (NT), Speed

sensor (NO)

Frequency of operation

Continuous

OFF malfunction (A) and (B)

0.4 sec.

OFF malfunction (C)

Immediate

Duration

ON malfunction (A), (B) and

(C)

0.4 sec.

ON malfunction (D)

3 sec.

ON malfunction (E)

0.5 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

All:

Turbine speed sensor circuit

Not circuit malfunction

Output speed sensor circuit

Not circuit malfunction

Shift solenoid valve S1 circuit

Not circuit malfunction

Shift solenoid valve S2 circuit

Not circuit malfunction

Shift solenoid valve SR circuit

Not circuit malfunction

Shift solenoid valve SL1 circuit

Not circuit malfunction

DIDJC–01

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–609

803

Shift solenoid valve SL2 circuit

Not circuit malfunction

ECT (Engine coolant temperature) sensor

circuit

Not circuit malfunction

KCS sensor circuit

Not circuit malfunction

ETCS (Electric throttle control system)

Not system down

Transmission range

”D”

ECT

40

°

C (104

°

F) or more

–

Spark advance from Max. retard timing by

KCS control

0

°

 

CA or more

–

Engine

Starting

Transfer range

”HIGH”

*1

Transfer range ”HIGH” *1 (This condition is applied only 4WD)

*1 Following conditions met

 Vehicle speed sensor circuit

Not circuit malfunction

 Output shaft speed sensor circuit

Not circuit malfunction

 Transfer output speed

143 rpm or more

–

 NO/NOtf (Transfer input speed/Transfer

output speed)

0.9 to 1.1

OFF malfunction (A)

ECM selected gear

1st

Vehicle speed

2 to 40 km/h (1.2 to 24.9 mph)

Throttle valve opening angle

8% or more

and 7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

OFF malfunction (B)

Current ECM selected gear

5th

Last ECM selected gear

4th

Continuous time for ECM selecting 4th

gear

2 sec. or more

–

Actual gear when ECM selected 4th gear

4th

OFF malfunction (C)

Current ECM selected gear

5th

Last ECM selected gear

4th

ON malfunction (A)

ECM selected gear

1st

Vehicle speed

2 to 40 km/h (1.2 to 24.9 mph)

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

ON malfunction (B)

ECM selected gear

4th

Vehicle speed

2 km/h (1.2 mph) or more

–

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

ON malfunction (C)

ECM selected gear

3rd

Vehicle speed

2 km/h (1.2 mph) or more

–

DI–610

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

804

Throttle valve opening angle

7.0% or more at 2,000 rpm

(Conditions vary with engine speed)

–

ON malfunction (D)

Current ECM selected gear

5th

Last ECM selected gear

4th

Vehicle speed 

(During transition from 4th to 5th gear)

–

Less than 100 km/h (62.2 mph)

ON malfunction (E)

ECM selected gear

5th

Engine speed – Turbine speed (NE – NT)

(After transition from 4th to 5th gear)

–

Less than 150 rpm

Vehicle speed 

(After transition from 4th to 5th gear)

–

Less than 100 km/h (62.2 mph)

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

[OFF malfunction]

All of the following conditions are met: Conditions (A), (B) and (C)

2 detections are necessary per driving cycle

 1st detection; temporary flag ON

 2nd detection; pending fault code ON

OFF malfunction (A)

Turbine speed/Output speed

0.93 to 1.07

OFF malfunction (B)

Turbine speed/Output speed

0.65 to 0.79

OFF malfunction (C)

Output record from ECM for 4th 

→

 5th upshifting

Recorded

[ON malfunction]

Either of the following conditions is met:

 ON malfunction (A) and (B)

 ON malfunction (B) or (C), and ON malfunction (D) or (E)

ON malfunction (A) and (B)

Turbine speed/Output speed

3.30 to 7.50

ON malfunction (C)

Turbine speed/Output speed

1.91 to 2.35

ON malfunction (D)

Turbine speed – Output speed x 4th gear ratio 

(NT – NO x 4th gear ratio)

1,000 rpm or more

ON malfunction (E)

Turbine speed – Output speed x 5th gear ratio 

(NT – NO x 5th gear ratio)

1,000 rpm or more