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 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts | |||
B+ | 0.0 Volts* | 0.0 Volts* | 12.6 Volts |
*The scan tool will not communicate with the PSCM if there is 0 Volts on the circuit. | |||
Circuit/System Description
The power steering control module (PSCM) monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. If the PSCM detects a system voltage outside an expected range, DTC C0800 will set.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
P0800 03
The PSCM detects that the battery voltage is between 7.5 and 8.75 volts.
P0800 07
The PSCM detects that the battery voltage is greater than 17 volts.
P0800 12
The PSCM detects that the battery voltage is less than 7.5 volts.
Action Taken When the DTC Sets
| • | The driver information center (DIC) displays the SERVICE POWER STEERING message. |
| • | Steering assist is reduced. |
Conditions for Clearing the DTC
| • | The DTC will pass when the condition for setting the DTC is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles without failing the DTC. |
Diagnostic Aids
| • | DTC C0800 could be set by overcharging with a battery charger or jump starting. |
| • | A high or low voltage DTC in multiple modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- 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.
- Observe the PSCM scan tool Battery Voltage parameter. The reading should be between 12.6 and 15.0 volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the PSCM.
- With the ignition OFF and the scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 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 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.
