6 Test For Speed Proportional Steering

THEORY OF OPERATION:
The Speed Proportional Steering Module regulates the amount of power steering assistance used based on vehicle speed. The Transmission Control Module (TCM) sends the Vehicle Speed Signal (VSS) to the Speed Proportional Module in the form of a 5 volt square wave signal. The Speed Proportional Steering Module has an ignition feed input and ground. The output of the Speed Proportional Steering Module is the duty cycle solenoid, which controls fluid flow to the reaction disc inside the steering gear.

LIMP-IN:
NO

WHEN MONITORED/SET CONDITIONS:
No Diagnostic Trouble Codes are set for this problem.

TRANSMISSION EFFECTS:
Normal operation continues with this problem.

POSSIBLE CAUSES:
- VSS circuit problem
- Defective Speed Proportional Steering Module
- Speed Proportional Steering control valve failure
- Speed Proportional Steering Module open/short circuit

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