Circuit Description
The power steering control module (PSCM) has a discrete battery positive voltage supply circuit. The PSCM monitors the voltage level on this circuit to ensure the electric power steering (EPS) system has adequate voltage levels to perform the system functions.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0800 Device Voltage
This vehicle has DTCs which include DTC symptoms. For more information on DTC symptoms, refer to DTC Symptom Description .
DTC Symptom | DTC Symptom Descriptor |
|---|---|
03 | Voltage Below Threshold |
07 | Above Maximum Threshold |
12 | Below Minimum Threshold |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
EPS system battery voltage is less than 9.55 volts or greater than 17.5 volts.
Action Taken When the DTC Sets
| • | DTC C0800 is stored in memory. |
| • | The instrument panel cluster (IPC) message center displays the PWR STR warning message. |
| • | Steering assist is reduced. |
Conditions for Clearing the DTC
| • | A current DTC will clear when EPS system voltage is 9.55-17.5 volts. |
| • | A history DTC will clear after 100 consecutive ignition cycles with EPS system voltage between 9.55-17.5 volts. |
Diagnostic Aids
The scan tool can be used to view the number of times a low battery voltage incident has occurred. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections for further diagnosis.
Test Description
The numbers below refer to the step number on the diagnostic table.
-
This step tests if the malfunction exists in the vehicles charging system.
-
This step tests if the malfunction is intermittent.
Step | Action | 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 | |
Does the scan tool display 9.55-17.5 volts? | Go to Step 3 | ||
With a scan tool, observe the Battery Voltage parameter in the electric power steering (EPS) Data List 1. Does the scan tool display 9.55-17.5 volts? | Go to Diagnostic Aids | Go to Step 4 | |
4 | Test the battery positive voltage circuit of the power steering control module (PSCM) for a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | 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 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the underhood fuse block stud terminal. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
7 | Inspect for poor connections at the harness connector of the PSCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | Inspect for poor connections at the ground terminal. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
9 | Replace the EPS assembly. Refer to Steering Column Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does DTC C0800 reset? | Go to Step 2 | System OK |
