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
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) message center displays the PWR STR warning message. |
| • | 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 in Wiring Systems for further diagnosis.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Connector End Views Reference: Power Steering Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool display greater than the specified value? | 17 V | Go to Symptoms - Engine Electrical in Engine Electrical | 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 to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 4 | Go to Diagnostic Aids | |
4 |
Does DTC C0900 reset? | Go to Step 2 | System OK | |
