Circuit Description
The power steering control module (PSCM) receives a vehicle speed message via the serial data circuit from the powertrain control module (PCM), if equipped with a 2.0L engine (LSJ), or from the engine control module (ECM), if equipped with a 2.2L engine (L61) or a 2.4L engine (LE5). The ECM receives the vehicle speed message from the transmission control module (TCM), if equipped with an automatic transmission (MN5). 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0000 Vehicle Speed Information Circuit
This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description in Vehicle DTC Information.
DTC Symptom | DTC Symptom Descriptor |
|---|---|
71 | Invalid Serial Data Received |
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTCs U2100, U2105, 2107, or U2109 are not set. |
| • | Power Steering System voltage is between 6-16 volts. |
Conditions for Setting the DTC
The PSCM receives an invalid vehicle speed message from the PCM (LSJ) or the ECM (L61/LE5).
Action Taken When the DTC Sets
| • | DTC C0000 71 is stored in memory. |
| • | The DIC displays the POWER STEERING warning message. |
| • | Steering assist is set to a default level. |
| • | Poor return to center. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the malfunction is no longer present. |
| • | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
| • | The DTC can be cleared by using a scan tool. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Data Link Connector Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate the presence of any vehicle speed related DTCs? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 | |
3 |
Does DTC C0000 reset? | Go to Step 2 | System OK |
