Circuit Description
The power steering control module (PSCM) receives a class 2 vehicle speed message from the engine control module (ECM) via the class 2 serial data circuit. The PSCM uses this vehicle speed message and other inputs to determine the desired amount of steering assist.
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, U1301, or U2100 are not set. |
| • | Vehicle speed is greater than 8.1 km/h (5 mph). |
Conditions for Setting the DTC
The PSCM receives an invalid or no vehicle speed message from the ECM.
Action Taken When the DTC Sets
| • | DTC C0000 is stored in memory. |
| • | The instrument panel cluster (IPC) message center displays the PWR STR warning message. |
| • | Steering assist level defaults to 120 km/h (74.5 mph) vehicle speed level of assist. |
Conditions for Clearing the DTC
| • | A current DTC will clear on the next consecutive malfunction-free ignition cycle. |
| • | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
Test Description
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 engine control module (ECM) or transmission control module (TCM) DTCs? | Go to Step 3 | ||
3 |
Does DTC C0000 reset? | Go to Step 2 | System OK |
