Toyota Sequoia (2005). Manual - part 211

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–639

833

2

Perform active test

HINT:
Performing the ACTIVE TEST using the hand–held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)

Warm up the engine.

(b)

Turn the ignition switch off.

(c)

Connect the hand–held tester to the DLC3.

(d)

Turn the ignition switch to the ON position.

(e)

Turn on the tester.

(f)

Select the item ”DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST”.

(g)

According to the display on the tester, perform the ”ACTIVE TEST”.

HINT:
While driving, the shift position can be forcibly changed with the hand–held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page 

DI–567

).

Standard:

Item

Test Details

Diagnostic Note

SHIFT

[Test Details]

Operate the shift solenoid valve and set each shift position by yourself.

[Vehicle Condition]

Less than 50 km/h (31 mph)

[Others]

Press ”

→

” button: Shift up

Press ”

←

” button: Shift down

Possible to check the operation of

the shift solenoid valves.

HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

The 4th to 5th up–shiftings must be performed with the accelerator pedal released.

The 5th to 4th down–shiftings must be performed with the accelerator pedal released.

Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.

The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand–
held tester.

OK:

Gear position changes in accordance with the tester command.

NG

Repair or replace valve body

 

(See page 

AT–10

).

OK

DI–640

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

834

3

Clear the DTC and running test.

CHECK:
Clear the DTC, and check DTC again after conducting the ”MONITOR DRIVE PATTERN FOR ECT TEST”
(See page 

DI–551

).

OK:

No DTC code

NG

Repair or replace valve body

 

(See page 

AT–10

).

OK

END

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–641

835

DTC

P0973

Shift Solenoid ”A” Control Circuit Low
(Shift Solenoid Valve S1)

DTC

P0974

Shift Solenoid ”A” Control Circuit High
(Shift Solenoid Valve S1)

CIRCUIT DESCRIPTION

Shifting from 1st to 5th is performed in combination with ”ON” and ”OFF” operation of the shift solenoid valves
SL1, SL2, S1, S2 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be
operated smoothly (See page 

DI–567

).

DTC No.

DTC Detection Condition

Trouble Area

P0973

ECM detects short in solenoid valve S1 circuit 2 times when

solenoid valve S1 is operated (1–trip detection logic)

Short in shift solenoid valve S1 circuit

Shift solenoid valve S1

ECM

P0974

ECM detects open in solenoid valve S1 circuit 2 times when

solenoid valve S1 is not operated (1–trip detection logic)

Open in shift solenoid valve S1 circuit

Shift solenoid valve S1

ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores
the DTC. When the shift solenoid valve S1 is on, if resistance is 8 

Ω

 or less, the ECM determines there is

a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if resistance is 100 k

Ω

 or more, the ECM determines there is an open

in the shift solenoid valve S1 circuit (See page 

DI–567

).

MONITOR STRATEGY

R l t d DTC

P0973

Shift solenoid valve S1/Range check (Low resistance)

Related DTCs

P0974

Shift solenoid valve S1/Range check (High resistance)

Required sensors/Components

Shift solenoid valve S1

Frequency of operation

Continuous

Duration

0.064 sec.

MIL operation

Immediate

Sequence of operation

None

DIDJI–01

D14170

E1 
Electronically Controlled 
Transmission Solenoid

ECM

11

E7

S1

8

W

R

S1

+B

CPU

DI–642

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DIAGNOSTICS

AUTOMATIC TRANSMISSION

836

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present.

See page 

DI–545

Range check (Low resistance)

Shift solenoid valve S1

ON

Range check (High resistance)

Shift solenoid valve S1

OFF

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

Range check (Low resistance)

Shift solenoid valve S1 resistance

8 

Ω

 or less

Range check (High resistance)

Shift solenoid valve S1 resistance

100 k

Ω

 or more

COMPONENT OPERATING RANGE

Parameter

Standard value

Shift solenoid valve S1

Resistance: 11 to 15 

Ω

 at 20

°

C (68

°

F)

WIRING DIAGRAM