Diagnostic Instructions
DTC Descriptor
DTC C0475 00: Electric Steering Motor Circuit
Diagnostic Fault Information
Circuit
| Short to Ground
| Open or High Resistance
| Short to Voltage
| Signal Performance
|
Motor
| C0475 00*
| C0475 00*
| --
| --
|
*After verifying a circuit fault exists in the power steering wiring harness extension harness for two mode hybrid. The wiring harness is to be replaced and not repaired
|
Circuit/System Description
The power steering control module (PSCM) continuously monitors the voltage and current levels being commanded to the electric power steering (EPS) motor. The 42-volt circuit from the accessory power module (APM) supplies power to the PSCM pulse
width modulated control circuit to drive the 3 phase motor. The PSCM compares the desired and actual current levels to detect malfunctions in the EPS motor, or the circuits to the motor.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The PSCM detects an open, or a short to ground on any of the motor phase circuits.
Actions Taken When DTC Sets
| • | The driver information center (DIC) displays the SERVICE POWER STEERING warning message. |
Conditions for Clearing the DTC
| • | A current DTC will clear on the next malfunction free ignition cycle. |
| • | A history DTC will clear after 100 consecutive malfunction free ignition cycles. |
Reference Information
Schematic Reference
Power Steering Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High
Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
| • | Identify how to disable high voltage. |
| • | Identify how to test for the presence of high voltage. |
| • | Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed. |
Failure to follow the procedures exactly as written may result in serious injury or death.
Important: After verifying a circuit fault exists in the Power Steering Assist Motor Wiring Harness for Two Mode Hybrid, the Power Steering Assist Motor is to be replaced and not repaired
- Perform the
High Voltage Disabling procedure.
- Ignition OFF, connect the 12-volt battery.
- Ignition OFF, disconnect the harness connector at the PSCM.
- Test for less than 1 Ω between the following circuits listed below.
| • | Control circuit terminal 2 and control circuit terminal 1 |
| • | Control circuit terminal 1 and control circuit terminal 3 |
| • | Control circuit terminal 2 and control circuit terminal 3 |
| ⇒ | If greater than the specified range, replace the power steering assist motor. |
- Test for greater than infinite resistance between the following circuits listed below and the power steering motor housing.
| • | Control circuit terminal 2 |
| • | Control circuit terminal 1 |
| • | Control circuit terminal 3 |
| ⇒ | If less than the specified range, replace the power steering assist motor. |
- If all circuits test normal, test or replace the PSCM.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
