Steering Controls

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Circuit Description
The Power Steering Control Module (PSCM) determines current flow of the power steering fluid flow control valve actuator (solenoid) which is relative to the vehicle speed.

The solenoid converts the electrical signal into a corresponding hydraulic control variable, which determines the amount of reaction pressure and thus the steering force.

Conditions For Setting The DTC
^ Short to ground or open in CKTs FR4 (BLK/GRY) or FY102 (BLK/PPL).
^ A defective power steering control valve actuator

Action Taken When The DTC Sets
^ Power steering assist will default to partial manual steering effort.
^ The PSCM will store a DTC 22 in memory.

Conditions For Clearing The DTC
^ Conditions for the fault are no longer present. The system returns to normal.
^ Using a scan tool.

Diagnostic Aids
^ Check for system voltage at terminal 6 with the key ON and the engine OFF.
^ Use a DMM in order to check the ground circuit at terminal 8. Typical voltage drop reading are 500 mV or less. When measuring the resistance it should measure at close to 0 (zero) ohms.
^ Use Terminal Repair Kit J 38125-A or J 35616-A to gauge all terminal contacts. Check for damaged connectors and poor wire to terminal connections.
^ If the DTC is an intermittent DTC, try to perform the tests shown while wiggling wiring and connectors, this can often cause the malfunction to appear.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.

3. This test checks for an open circuit in the wiring and control valve actuator windings.
6. This test checks for a short to ground in both circuit FY102 and FR4.
8. Before replacing the module, check the power and ground circuits.
10. This step determines after all repair attempts and DTC 22 is still present, that an internal malfunction exists in the Power Steering Control Module.