Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0800 03: Device Power Circuit Voltage Below Threshold - 12 VDTC C0800 07: Device Power Circuit Voltage Above Threshold - 12 V
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0800 03 | C0800 03 | -- | -- |
Ground | -- | C0800 03 | -- | -- |
Circuit Description
The power steering control module (PSCM) has a discrete 12 V 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.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PSCM detects that the 12 V battery voltage is less than 9.5 V or greater than 17.5 V.
Action Taken When the DTC Sets
Steering assist is reduced.
Conditions for Clearing the DTC
| • | The DTC will pass when EPS system voltage is 9.5-17.5 V. |
| • | A history DTC will clear after 40 consecutive ignition cycles with EPS system voltage between 9.5-17.5 V. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Engine running, accessories OFF, measure and record the battery voltage at the 12 V battery terminals. The voltage should be between 12.6 and 15.0 V.
- Ignition OFF, disconnect the harness connectors at the PSCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 30 seconds. Test for less than 5 Ω between the ground circuit terminal 2 X1 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 1 X1 and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 X2 and ground.
- If all circuits test normal, replace the PSCM.
| ⇒ | If not within the specified range, refer to Charging System Test. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PSCM replacement, setup, and programming.
