• | 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. |
The power steering control module (PSCM) receives a vehicle speed message from the engine control module (ECM) via the serial data circuit. The PSCM uses this vehicle speed message, and other inputs, to determine the desired amount of steering assist. At lower speeds, more assist is provided for easy turning during parking maneuvers. At higher speeds, less assist is provided for improved road feel and directional stability.
• | The ignition is ON. |
• | DTC U2100, U2105, 2107, or U2109 is not set. |
• | Power steering system voltage is between 9-16 volts. |
The PSCM receives an invalid vehicle speed message from the ECM.
• | DTC C0000 71 is stored in memory. |
• | The DIC displays the POWER STEERING warning message. |
• | Steering assist is set to a default level. |
• | A current DTC will clear when the malfunction is no longer present. |
• | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
This DTC is for information only. As an aid to the technician, this DTC indicates that their are no problems in the PSCM. The ECM should be checked for a possible fault.
Power Steering System Description and Operation
Control Module References for scan tool information
⇒ | If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |