Nissan Altima (L32) 2007-2012 Service Manual ≻ Steering control system ≻ ECU diagnosis

Nissan Altima (L32) 2007-2012 Service Manual: ECU diagnosis

POWER STEERING CONTROL UNIT

Reference Value

TERMINAL LAYOUT

PHYSICAL VALUES

CAUTION: When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to extend forcibly any connector terminals.

Wiring Diagram — ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM

Fail Safe

EPS system

• EPS system enters the fail-safe mode (that allows the steering force to be controlled without impairing the drive ability) if any of the input/output signals to/from EPS system (power steering control unit) deviate from the standard.

NOTE: The system enters the fail-safe mode if the engine speed remains at 1,500 rpm or more for over 10 seconds while the vehicle is stopped. This is normal.

• The fail-safe function is canceled when a vehicle speed signal of 2 km/h (1.2 MPH) or more is inputted or the key switch is turned OFF→ ON. EPS system restores the normal operation at that time.

Vehicle speed signal circuit

Description • Combination meter sends vehicle speed signal to power steering control unit. Diagnosis Procedure 1.PERFORM COMBINATION METER SELF-DIAGNOSIS Perform combination meter self-diagno ...

Symptom diagnosis

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION) Description • Hard steering when fully turning the steering wheel. • Light steering when driving at a high speed. Diagnosis Proce ...

Other materials:

Doors
When the doors are locked using one of the following methods, the doors cannot be opened using the inside or outside door handles. The doors must be unlocked to open the doors. WARNING Always have the doors locked while driving. Along with the use of seat belts, this provides greater safety in ...

Rear Sonar System (RSS)
The RSS sounds a tone to inform the driver of obstacles near the bumper. When the "DISPLAY" key is on, the sonar view will automatically appear in the touch-screen display. An additional view of the sonar status will appear in the vehicle information display for reference. WARNING The RSS is a c ...

Forward-facing child restraint installation using LATCH
For additional information, see all Warnings and Cautions in "Child safety" and "Child restraints" before installing a child restraint. Do not use the lower anchors if the combined weight of the child and the child restraint exceeds 65 lbs. (29.5 kg). If the combined weight of the child and the chi ...