Toyota Avalon Service & Repair Manual: Fail-safe Chart

FAIL-SAFE CHART

Description

The fail-safe function minimizes the loss of operation when a malfunction occurs in a sensor or solenoid.

Fail-safe

(a) Fail-safe control list:

Malfunctioning Part

Function

Transmission Revolution Sensor (NT)

  • Lock up clutch control is prohibited.
  • High response gear shifts are prohibited.

Transmission Revolution Sensor (NC)

  • Lock up clutch control is prohibited.
  • High response gear shifts are prohibited.

Solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SLT, SLU and SL) valve

If the ECM detects a solenoid valve malfunction, it performs fail-safe control.

ATF temperature sensor

  • Lock up clutch control is prohibited.
  • High response gear shifts are prohibited.

ECM power supply (voltage is low)

  • When driving in 1st to 5th gear when a malfunction is detected, the transaxle will be fixed in 5th gear.
  • When driving in 6th to 8th gear when a malfunction is detected, the transaxle will be fixed in the current gear.

Knock sensor

  • When driving in 1st to 5th gear when a malfunction is detected, up-shift to 6th or higher will be prohibited.
  • When driving in 6th gear or higher when a malfunction is detected, up-shift to a higher gear will be prohibited.
  • Lock up clutch control is prohibited.
  • High response gear shifts are prohibited.

CAN communication

  • When driving in 1st to 3rd gear when a malfunction is detected, the transaxle will be fixed in 3rd gear.
  • When driving in 4th to 8th gear when a malfunction is detected, up-shift to a higher gear will be prohibited.
  • Lock up clutch control is prohibited.
  • High response gear shifts are prohibited.

Solenoid (SLU) valve

  • Lock up clutch control is prohibited.
  • Shifting to or from 3rd or 4th gear is prohibited.
  • Shifting to or from 6th, 7th or 8th gear is prohibited.

Solenoid (SLT) valve

  • Engine output is limited.
  • High response gear shifts are prohibited.
  • Lock up clutch control is prohibited.
  • The transaxle will be fixed in 5th gear.

(b) Solenoid Valve Normal Operation Chart:

Gear

1st

2nd

3rd

4th

5th

6th

7th

8th

Solenoid (SL1) Valve

ON

ON

ON

ON

ON

OFF

OFF

OFF

Solenoid (SL2) Valve

OFF

OFF

OFF

OFF

ON

ON

ON

ON

Solenoid (SL3) Valve

OFF

OFF

ON

OFF

OFF

OFF

ON

OFF

Solenoid (SL4) Valve

OFF

OFF

OFF

ON

OFF

ON

OFF

OFF

Solenoid (SL5) Valve

OFF

ON

OFF

OFF

OFF

OFF

OFF

ON

Solenoid (SL6) Valve

ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

(c) Fail-safe Control Chart:

*1: Operation of fail-safe is canceled the first time the vehicle is stopped.

*2: Operation of fail-safe is not canceled for subsequent times the vehicle is stopped.

Fail-safe operation is performed when the ECM detects a malfunction.

Fail-safe Control Chart (Solenoid (SL1) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

1st

2nd

3rd

4th

5th

4th to 5th

3rd to 5th

5th

Fail-safe control during ON malfunction

1st

2nd

3rd

4th

5th

5th

5th

5th

OFF malfunction

(without fail-safe control)

N*

N*

N*

N*

N*

6th

7th

8th

Fail-safe control during OFF malfunction

6th

6th

6th

6th

6th

6th

7th

8th

Fail-safe Control Chart (Solenoid (SL2) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

5th

5th

3rd to 5th

4th to 5th

5th

6th

7th

8th

Fail-safe control during ON malfunction

5th

5th

5th

5th

5th

6th

7th

8th

OFF malfunction

(without fail-safe control)

1st

2nd

3rd

4th

N*

N*

N*

N*

Fail-safe control during OFF malfunction

1st

2nd

3rd

4th

4th

4th

4th

4th

Fail-safe Control Chart (Solenoid (SL3) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

3rd

3rd

3rd

3rd

3rd to 5th

7th

7th

7th

Fail-safe control during ON malfunction

3rd

3rd

3rd

3rd

3rd

7th

7th

7th

OFF malfunction

(without fail-safe control)

1st

2nd

N*

4th

5th

6th

N*

8th

Fail-safe control during OFF malfunction

1st

2nd

4th

4th

5th

6th

6th

8th

Fail-safe Control Chart (Solenoid (SL4) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

4th

4th

3rd

4th

4th to 5th

6th

7th

6th

Fail-safe control during ON malfunction

4th

4th

4th

4th

4th

6th

6th

6th

OFF malfunction

(without fail-safe control)

1st

2nd

3rd

N*

5th

N*

7th

8th

Fail-safe control during OFF malfunction

1st

2nd

3rd

5th

5th

7th

7th

8th

Fail-safe Control Chart (Solenoid (SL5) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

N*

2nd

3rd

4th

5th

6th

7th

8th

Fail-safe control during ON malfunction

2nd

2nd

3rd

4th

5th

6th

7th

8th

OFF malfunction

(without fail-safe control)

1st

N*

3rd

4th

5th

6th

7th

N*

Fail-safe control during OFF malfunction

3rd

3rd

3rd

4th

5th

6th

7th

7th

Fail-safe Control Chart (Solenoid (SL6) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

1st

N*

3rd

4th

5th

6th

7th

N*

Fail-safe control during ON malfunction

3rd

3rd

3rd

4th

5th

6th

7th

7th

OFF malfunction

(without fail-safe control)

N*

2nd

3rd

4th

5th

6th

7th

8th

Fail-safe control during OFF malfunction

2nd

2nd

3rd

4th

5th

6th

7th

8th

Fail-safe Control Chart (Solenoid (SLT) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

OFF malfunction

(without fail-safe control)

(MAX Pressure)

1st

5th

3rd to 5th

4th to 5th

5th

4th to 5th

3rd to 5th

5th

Fail-safe control during ON malfunction

Fixed in 5th

Fail-safe Control Chart (Solenoid (SLU) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

1st

2nd

3rd or N*

4th or N*

5th

6th or N*

7th or N*

8th

Fail-safe control during ON malfunction

1st

2nd

5th

5th

5th

5th

5th

8th

Fail-safe Control Chart (Solenoid (SL) Valve)

Gear Under Normal Conditions

1st

2nd

3rd

4th

5th

6th

7th

8th

*: Neutral

ON malfunction

(without fail-safe control)

(MIN Pressure)

1st

2nd

3rd or N*

4th or N*

5th

6th or N*

7th or N*

8th

Fail-safe control during ON malfunction

1st

2nd

5th

5th

5th

5th

5th

8th

HINT:

In the case of an open or short, the ECM stops sending current to the open or shorted solenoid.

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