Toyota 4Runner manuals

Toyota 4Runner: Fail-safe Chart

FAIL-SAFE CHART

If a problem occurs in the power steering system, the power steering warning light in the combination meter comes on and the power steering assist is stopped, locked at a particular point or decreased simultaneously to protect the system.

Power Steering System

DTC Code

Detection Condition

Fail-safe Operation

C15F0

Short circuit between power steering solenoid valve terminals SOF+ and ground

Assist force is restricted.

Short circuit between power steering solenoid valve terminals SOF- and ground

Power assist continues as normal.

Short circuit between power steering solenoid valve terminals SOF+ and SOF-

Assist force is restricted.

Power steering solenoid valve open circuit

Assist force is restricted.

C15F1

Steering angle sensor circuit malfunction

The power steering system is limited depending on which ECU has lost communication. For details, refer to Fail-safe Function.

C1544

Engine speed signal malfunction

C1541

Vehicle speed signal malfunction

U0100

Lost Communication with ECM / PCM "A"

U0126

Lost Communication with Steering Angle Sensor Module

U0129

Lost Communication with Brake System Control Module

1. FAIL-SAFE FUNCTION

If the power steering ECU assembly cannot receive the steering angle signal, steering zero point memory, vehicle speed signal or engine speed signal, the power steering warning light in the combination meter illuminates and the vehicle enter a fail-safe mode.

Malfunction Area

Fail-Safe Mode

Steering Angle Signal

Steering Zero Point Memory

Vehicle Speed Signal

Engine Speed Signal

X

-

-

-

  • V-Q control fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation normal

-

X

-

-

  • V-Q control normal
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation normal

-

-

X

-

Assume vehicle speed 40 km/h (25 mph) and control each compensation

-

-

-

X

  • V-Q control normal
  • Steering angle compensation normal
  • Steering wheel return compensation normal
  • Engine speed compensation disabled

X

X

-

-

  • V-Q control fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation normal

X

-

X

-

Constant fluid volume

X

-

-

X

  • V-Q control characteristics fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation disabled

-

X

X

-

  • V-Q control fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation normal

-

X

-

X

  • V-Q control normal
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation disabled

-

-

X

X

  • Assume vehicle speed 40 km/h (25 mph) and control each compensation
  • Engine speed compensation disabled

-

X

X

X

  • V-Q control characteristics fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation disabled

X

-

X

X

Constant fluid volume

X

X

-

X

  • V-Q control characteristics fixed
  • Steering angle compensation disabled
  • Steering wheel return compensation disabled
  • Engine speed compensation disabled

X

X

X

-

Constant fluid volume

X

X

X

X

Constant fluid volume

HINT:

X: Malfunction

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3. (c) Turn the ignition switch to ON. (d) Turn the Techstream on. (e) Enter the following m ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any p ...

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