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 - PSCMDTC C0800 07: Device Power Circuit Voltage Above Threshold - PSCM
DTC C0800 12: Device Power Circuit Voltage Below Minimum Threshold - PSCM
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0800 03, C0800 12 | C0800 03, C0800 12 | -- | -- |
Ground | -- | C0800 03, C0800 12 | -- | -- |
Circuit Description
The power steering control module (PSCM) monitors the voltage level on the B+ circuit to ensure the electric power steering (EPS) system has adequate voltage levels to perform the system functions. If the battery voltage is out of range, DTC C0800 sets.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PSCM detects that the battery voltage is less than 9.55 volts or greater than 17.5 volts.
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 volts. |
| • | A history DTC will clear after 100 consecutive ignition cycles with EPS system voltage between 9.5-17.5 volts. |
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 battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Ignition OFF, disconnect the harness connectors at the PSCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals 2 X5 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 1 X5 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PSCM replacement, setup, and programming.
