Circuit Description
The power steering control module (PSCM) receives a vehicle speed message from the powertrain control module (PCM) via the serial data circuit. The PSCM uses this vehicle speed message and other inputs to determine the desired amount of steering assist. If the PSCM does not receive the vehicle speed message, it sets DTC C0000.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0000 Vehicle Speed Information Circuit
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTC U1300 or U1301 are not set. |
Conditions for Setting the DTC
The PSCM receives an invalid, or no vehicle speed message from the engine control module (ECM).
Action Taken When the DTC Sets
| • | DTC C0000 is stored in memory. |
| • | The instrument panel cluster (IPC) displays the SERVICE VEHICLE SOON warning indicator. |
| • | Steering assist is set to a default level. |
Conditions for Clearing the DTC
| • | A current DTC will clear on the next malfunction-free ignition cycle. |
| • | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Power Steering Schematics Connector End View Reference: Power Steering Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the scan tool indicate the presence of any vehicle speed related DTCs? | Go to Step 3 | ||
3 |
Does DTC C0000 reset? | Go to Step 2 | System OK |
