Toyota 4Runner manuals

Toyota 4Runner: Fail-safe Chart

FAIL-SAFE CHART

1. FAIL-SAFE

This function minimizes the loss of ECT functions when a malfunction occurs in a sensor or solenoid.

Malfunction Part

Function

No. 1 ATF temperature sensor

During a No. 1 ATF temperature sensor malfunction, up-shift to 5th gear and flex lock-up clutch control are prohibited.

Speed sensor SP2

During an output speed sensor malfunction, shift control is performed using the input speed sensor NT signal.

Shift solenoid valve S1, S2 and SR

The current to the malfunctioning solenoid valve is cut off and control is performed by operating the other normal solenoid valves.

Shift control is performed depending on the failed solenoid as described in the table below.

Shift solenoid valve SL1 and SL2

During a solenoid valve SL1 or SL2 malfunction, up-shift to 5th gear is prohibited.

Shift solenoid valve SLT

During a solenoid valve SLT malfunction, the current to the solenoid valve is stopped. This stops line pressure optimal control, and shift shock increases. However, shifting is performed using normal clutch pressure control.

Shift solenoid valve SLU

During a solenoid valve SLU malfunction, the current to the solenoid valve is stopped. This stops lock-up control and flex lock-up control, and fuel economy decreases.

Shift Solenoid Valve Normal Operation Chart

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

5th

OFF

OFF

ON

ON

OFF

S4

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd E/B

OFF

ON

OFF

OFF

OFF

S2

1st

ON

OFF

OFF

OFF

ON

2nd E/B

ON

ON

ON

OFF

OFF

S1

1st E/B

ON

OFF

OFF

OFF

OFF

2. FAIL-SAFE FUNCTION

If any of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoids ON and OFF in order to shift into the gear positions shown in the table below.

In case of a short circuit, the ECM stops sending current to the short-circuited solenoid.

Even when starting the engine again in the fail-safe mode, the gear position remains in the same position.

HINT:

  • Electrical malfunction: Condition is shown above the "↓".
  • Fail-safe mode: Condition is shown below the "↓".
  • E/B: Engine brake.
Fail-safe Operation when Shift Solenoid Valve S1 is Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

4th

3rd

OFF

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

5th

OFF

OFF

ON

ON

OFF

S4

4th

3rd

OFF

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

3rd

3rd E/B

OFF

OFF

ON

OFF

OFF

ON

OFF

3rd

3rd E/B

OFF

ON

OFF

OFF

ON

OFF

3rd E/B

OFF

ON

OFF

OFF

OFF

S2

1st

OFF

OFF

OFF

OFF

ON

3rd E/B

OFF

ON

ON

OFF

OFF

S1

1st E/B

OFF

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve S2 is Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

1st

ON

OFF

OFF

OFF

ON

1st

4th

ON

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

5th

OFF

OFF

ON

ON

OFF

S4

1st

ON

OFF

OFF

OFF

ON

1st

4th

ON

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

1st

ON

OFF

OFF

OFF

ON

1st

3rd E/B

ON

OFF

OFF

OFF

OFF

ON

OFF

3rd E/B

OFF

OFF

OFF

OFF

OFF

S2

1st

ON

OFF

OFF

OFF

ON

2nd E/B

4th

ON

OFF

OFF

ON

OFF

OFF

ON

S1

1st E/B

ON

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve SR is Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

ON

OFF

S4

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

ON

3rd E/B

3rd

OFF

ON

OFF

OFF

OFF

ON

S2

1st

ON

OFF

OFF

OFF

ON

2nd

ON

ON

OFF

OFF

OFF

S1

1st E/B

ON

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve S1 and S2 are Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

5th

OFF

OFF

ON

ON

OFF

S4

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

3rd

3rd E/B

OFF

OFF

OFF

OFF

ON

OFF

3rd

3rd E/B

OFF

OFF

OFF

OFF

ON

OFF

3rd E/B

OFF

OFF

OFF

OFF

OFF

S2

1st

OFF

OFF

OFF

OFF

ON

Fail 4th

OFF

OFF

ON

OFF

OFF

ON

S1

1st E/B

OFF

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve S2 and SR are Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

1st

ON

OFF

OFF

OFF

ON

1st

4th

ON

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

ON

OFF

OFF

ON

S4

1st

ON

OFF

OFF

OFF

ON

1st

4th

ON

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

1st

ON

OFF

OFF

OFF

ON

1st

3rd

ON

OFF

OFF

OFF

OFF

ON

ON

3rd E/B

3rd

OFF

OFF

OFF

OFF

OFF

ON

S2

1st

ON

OFF

OFF

OFF

ON

1st E/B

1st

ON

OFF

OFF

OFF

OFF

ON

S1

1st E/B

ON

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve S1 and SR are Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

4th

3rd

OFF

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

ON

OFF

OFF

ON

S4

4th

3rd

OFF

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

3rd

OFF

ON

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

3rd

OFF

OFF

ON

OFF

OFF

ON

ON

3rd

OFF

ON

OFF

OFF

ON

ON

3rd E/B

3rd

OFF

ON

OFF

OFF

OFF

ON

S2

1st

OFF

OFF

OFF

OFF

ON

2nd

OFF

ON

OFF

OFF

OFF

S1

1st E/B

OFF

OFF

OFF

OFF

OFF

Fail-safe Operation when Shift Solenoid Valve S1, S2 and SR are Malfunctioning

Shift Lever Position

Gear

Shift Solenoid S1

Shift Solenoid S2

Shift Solenoid SR

Shift Solenoid SL1

Shift Solenoid SL2

D

S5

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

ON

OFF

OFF

ON

S4

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

4th

OFF

OFF

OFF

OFF

ON

S3

3rd

OFF

OFF

OFF

OFF

ON

ON

3rd

OFF

OFF

OFF

OFF

ON

ON

3rd E/B

3rd

OFF

OFF

OFF

OFF

OFF

ON

S2

1st

OFF

OFF

OFF

OFF

ON

1st E/B

1st

OFF

OFF

OFF

OFF

OFF

ON

S1

1st E/B

OFF

OFF

OFF

OFF

OFF

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