Last Modified: 11-29-2007 1.6 U
Service Category: Steering Section: Power Assist Systems
Model Year: 2008 Model: Sequoia Doc ID: RM000001JTU004X
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: FAIL-SAFE CHART (2008 Sequoia)

FAIL-SAFE CHART

If the power steering ECU cannot obtain the steering angle signal, the steering zero point memory, the vehicle speed signal, or the engine speed signal, the EPS warning light in the combination meter illuminates and the vehicle enters 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 normal
  • Steering angle compensation disable
  • Steering wheel return compensation disable
  • Engine speed compensation disable
 

X

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

X

  

Assume vehicle speed 2 km/h and control each compensations
     

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

X

X

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

X

  

X

  

Constant fluid volume

X

    

X
  • V-Q control characteristics fixed
  • Steering angle compensation disable
  • Steering wheel return compensation disable
  • Engine speed compensation normal
 

X

X

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

X

  

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

X

X
  • Assume vehicle speed 2 km/h and control each compensations
  • Engine speed compensation disable
 

X

X

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

X

  

X

X

Constant fluid volume

X

X

  

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

X

X

X

  

Constant fluid volume

X

X

X

X

Constant fluid volume

HINT:

X: Malfunction