Circuit Description
The power steering control module (PSCM) has a discrete battery voltage supply circuit. The PSCM monitors the voltage level on this circuit to protect itself against high voltage damage.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0900 Device 1 Voltage High
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The electric power steering (EPS) system voltage is greater than 17 volts.
Action Taken When the DTC Sets
| • | DTC C0900 is stored in memory. |
| • | The instrument panel cluster (IPC) displays the SERVICE VEHICLE SOON warning indicator. |
| • | The PSCM is disabled to protect itself. |
Conditions for Clearing the MIL/DTC
| • | A current DTC will clear when the EPS system voltage returns to less than 15.5 volts. |
| • | A history DTC will clear after 100 consecutive ignition cycles with the EPS system voltage less than 15.5 volts. |
| • | Using a scan tool |
Diagnostic Aids
Jump starting the vehicle can cause DTC C0900 to set. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections for further diagnosis.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Power Steering Schematics Connector End Views Reference: Power Steering Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool display greater than the specified value? | 17 V | Go to Step 3 | |
3 | Test the ground circuit of the power steering control module (PSCM) for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
