Electronic Power Steering (EPS) System

• Component Location Index
• General Troubleshooting Information
  • EPS Indicator
  • Diagnostic Trouble Code (DTC)
  • Self-Diagnosis
  • Restriction on Power Assist Operation
  • Torque Sensor Neutral Position
  • How to Troubleshoot DTCs
  • How to Use the HDS (Honda Diagnostic System)
  • How to Retrieve DTCs
  • How to Clear DTCs
• Memorizing the Torque Sensor Neutral Position
• DTC Troubleshooting Index
• Symptom Troubleshooting Index
• System Description
  • EPS Control Unit Inputs and Outputs for Connector A (2P) (Connector Disconnected)
  • EPS Control Unit Inputs and Outputs for Connector B (2P) (Connector Disconnected)
  • EPS Control Unit Inputs and Outputs for Connector C (2P) (Connector Disconnected)
  • EPS Control Unit Inputs and Outputs for Connector D (28P) (Connector Disconnected)
  • System Outline
    • Notes
    • System Operation
    • Torque Sensor Operation
  • EPS Control Unit Operation
    • Notes
    • Power Relay (built into the EPS control unit)
    • Fail-Safe Relay (built into the EPS control unit)
    • Current Sensor
  • EPS Motor Operation
• Circuit Diagram
• DTC Troubleshooting
  • DTC 11-01: Low/High IG1-Terminal Voltage; DTC 11-02: Battery Voltage
  • DTC 12-01: Motor Power Supply Voltage
  • DTC 21-01: Excessive Change of the Vehicle Speed Signal; DTC 21-02: Comparison between the Vehicle Speed and the Engine Speed Signal
  • DTC 22-01: Engine Speed Signal
  • DTC 31-01: Torque Sensor Neutral Position Not Written
  • DTC 32-01: EPS Control Unit Internal Circuit (Current Sensor); DTC 32-02: EPS Control Unit Internal Circuit (Current Sensor); DTC 35-01: EPS Control Unit Internal Circuit (CPU); DTC 35-02: EPS Control Unit Internal Circuit (EEPROM); DTC 35-04: EPS Control Unit Internal Circuit (CPU Communication); DTC 35-07: EPS Control Unit Internal Circuit (INHL/INHR Ports); DTC 36-02: EPS Control Unit Internal Circuit (INH Output Circuit); DTC 37-01: EPS Control Unit Internal Circuit (Step-Up Circuit)
  • DTC 32-07: EPS Control Unit Internal Circuit (Current Sensor)
  • DTC 32-08: EPS Control Unit Internal Circuit (Current Sensor); DTC 32-09: Motor Current Correlation
  • DTC 33-01: Lower FET Stuck ON; DTC 33-06: Lower FET Stuck ON
  • DTC 33-02: Upper FET Stuck ON; DTC 33-07: Upper FET Stuck ON
  • DTC 34-01: Power Relay
  • DTC 34-02: Fail-Safe Relay
  • DTC 35-05: EPS Control Unit Internal Circuit (A/D Conversion)
  • DTC 51-01: Torque Sensor (VT1, VT2 Low/High Voltage)
  • DTC 51-02: Torque Sensor (VT3 Differential-Amplification Function); DTC 51-03: Torque Sensor (VT1, VT2 Rapid Change); DTC 51-06: Torque Sensor (VT1, VT2 Average); DTC 51-07: Torque Sensor (VT1, VT2 Check)
  • DTC 61-04: Motor Harness Malfunction
  • DTC 71-01: Motor Angle Sensor (SIN/COS Signals); DTC 71-02: Motor Angle Sensor (Neutral Position Learning of SIN/COS); DTC 71-03: Motor Angle Sensor (SIN/COS Signals)
  • DTC 71-04: Motor Angle Sensor (Check Signals)
• Symptom Troubleshooting
  • EPS indicator does not come on
  • EPS indicator does not go off, and no DTCs are stored
• Steering Gearbox Removal and Installation
  • Notes
  • Removal
  • Installation
• Rack End Removal and Installation
  • Exploded View
  • Removal
  • Installation
• Rack Guide Removal/Installation
• EPS Control Unit Removal/Installation