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
This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .
DTC Symptom | DTC Symptom Descriptor |
|---|---|
00 | No Additional DTC Information |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
Power Steering System voltage is greater than 16 volts for at least 1 second.
Action Taken When the DTC Sets
| • | DTC C0900 00 is stored in memory. |
| • | The DIC displays the POWER STEERING warning message. |
| • | The PSCM is disabled to protect itself. |
| • | No steering assist is provided. |
Conditions for Clearing the MIL/DTC
| • | A current DTC will clear when the Power Steering System voltage returns to less than 16 volts. |
| • | A history DTC will clear after 100 consecutive ignition cycles from when Power Steering System voltage is less than 16 volts. |
| • | Using a scan tool |
Diagnostic Aids
Jump starting the vehicle, or turning ON the ignition while charging the vehicles battery can cause DTC C0900 00 to set.
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 indicate that the Battery Voltage parameter is greater than the specified value? | 16 V | Go to Step 3 | Go to Diagnostic Aids |
3 | Inspect for poor connections at the ground terminal G103. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 4 | |
4 | Inspect for poor connections at the power steering control module (PSCM) harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 5 | |
5 | Test the ground circuit of the PSCM for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 7 | Go to Step 6 | |
6 | Replace the power steering motor and module assembly. Refer to Power Steering Assist Motor Replacement . Did you complete the replacement? | Go to Step 7 | -- | |
7 |
Does the DTC reset? | Go to Step 2 | System OK | |
