Toyota 4Runner manuals

Toyota 4Runner: Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2) (P0976,P0977)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2) (P0976,P0977)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the ECM. If an open or short circuit occurs in one of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly. In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the fail-safe chart (See page ).


DTC Code

DTC Detection Condition

Trouble Area

P0976

The ECM detects a short in the 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

The ECM detects an open in the 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

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 Ω 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 kΩ or higher, the ECM determines there is an open in the shift solenoid valve S2 circuit (See page ).


MONITOR STRATEGY

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

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored

None

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

P0976: Range Check (Low Resistance)

Shift solenoid valve S2

ON

P0977: Range Check (High Resistance)

Shift solenoid valve S2

OFF

TYPICAL MALFUNCTION THRESHOLDS

P0976: Range Check (Low Resistance)

Shift solenoid valve S2 resistance

8 Ω or less

P0977: Range Check (High Resistance)

Shift solenoid valve S2 resistance

100 kΩ or higher

COMPONENT OPERATING RANGE

Shift solenoid valve S2 resistance

11 to 15 Ω at 20°C (68°F)

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).


HINT:

The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in D.

ECM gear shift command

1st

2nd

3rd

4th

5th

Shift solenoid valve S2

OFF

ON

ON

OFF

OFF

PROCEDURE

1.

INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)

(a) Disconnect the B32 transmission wire connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

15 (S2) - Body ground

20°C (68°F)

11 to 15 Ω

Text in Illustration

*a

Component without harness connected

(Transmission Wire)


NG

GO TO STEP 3

OK

2.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the B36 ECM connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B36-33 (S2) - Body ground

20°C (68°F)

11 to 15 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to ECM)


OK

REPLACE ECM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

INSPECT SHIFT SOLENOID VALVE S2



OK

REPAIR OR REPLACE TRANSMISSION WIRE


NG

REPLACE SHIFT SOLENOID VALVE S2

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