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Variable Effort Steering Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

power steering control module Ignition

1

1

—

—

Variable Effort Steering Actuator Control Circuit 1

1

1

1

—

Variable Effort Steering Actuator Control Circuit 2

1

1

1

—

power steering control module Ground

—

1

—

—

1. Variable Effort Steering Malfunction

Circuit/System Description

The actuator is a variable electromagnetic actuator, which consists of one multiple-pole ring-style permanent magnet, with a pole piece, and an electromagnetic coil assembly. By commanding currents between -3 to +3 A through the coils the steering effort will be adapted accordingly.

Diagnostic Aids

The vehicle may need to be driven to view full Power Steering Coil commanded and actuator feedback data parameters.

Reference Information

Schematic Reference

Power Steering Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Steering System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

Note: It is recommended that Component Testing is performed before Circuit/System Testing when diagnosing the Power Steering Coil.

  1. Ignition OFF, disconnect the harness connector at the power steering control module.
  2. Test for less than 1Ω between the ground circuit terminal 10 and ground.
    3. ⇒If greater than specified range, test the ground circuit for a open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 and ground.
    4. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, disconnect the harness connector at the power steering coil.
  5. Ignition ON, test for less than 0.3 V between the control terminals listed below and ground.
    6. • Power steering coil, terminal 1
    • Power steering coil, terminal 2
    ⇒If greater than the specified value, test the control circuits for a short to voltage. If the circuits test normal, replace the power steering control module.
  6. Ignition OFF, test for less than 1Ω between the control circuit terminal listed below and ground.
    7. • Power steering coil, terminal 1
    • Power steering coil, terminal 2
    ⇒If greater than specified range, test the control circuits for a short to ground.
  7. Test for less than 1Ω between the control circuit terminals listed below.
    8. • Power steering coil, terminal 1 and power steering control module, terminal 1
    • Power steering coil, terminal 2 and power steering control module, terminal 2
    ⇒If greater than specified value, test the control circuits for a open/high resistance. If the circuits test normal, test or replace the power steering coil.
  8. If all circuits test normal, test or replace the power steering control module.

Component Testing
  1. Ignition OFF, disconnect the harness connector at the power steering coil.
  2. Test for 1.6-3.1 Ω between control terminal 1 and control terminal 2.
    3. ⇒If not the specified range, replace the power steering coil.
  3. Test for infinite resistance between each terminal and the power steering coil housing case.
    4. ⇒If not the specified value, replace the power steering coil.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References
    •  Steering Gear Replacement
   


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