2000 Honda S2000FACTORY OEM SERVICE PROCEDURE

Electrical Power Steering (EPS) Signal Circuit Troubleshooting

  1. Turn the ignition switch ON (II).
  2. Measure voltage between ECM connector terminals A26 and B20.
    Fig 1: Measuring Voltage Between ECM Connector Terminals A26 And B20
    G03692744Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step  6.
    2. NO -  Go to step 3.
  3. Start the engine.
  4. Turn the steering wheel to the full lock position.
  5. Measure voltage between ECM connector terminals A26 and B20.

    Is there battery voltage briefly? 

    1. YES -  The EPS signal is OK.
    2. NO -  Go to step  10.
  6. Turn the ignition switch OFF.
  7. Disconnect the EPS control unit 14P connector.
  8. Turn the ignition switch ON (II).
  9. Measure voltage between EPS control unit 14P connector terminal No. 13 and body ground.
    Fig 2: Measuring Voltage Between EPS Control Unit 14P Connector Terminal No. 13 And Body Ground
    G03692745Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Substitute a known-good EPS control unit and recheck.
    2. NO -  Repair open in the wire between the ECM (A26) and the EPS control unit.
  10. Turn the ignition switch OFF.
  11. Disconnect the EPS valve 14P connector.
  12. Turn the ignition switch ON (II).
  13. Measure voltage between EPS control unit 14P connector terminal No. 13 and body ground.
    Fig 3: Measuring Voltage Between EPS Control Unit 14P Connector Terminal No. 13 And Body Ground
    G03692746Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Substitute a known-good EPS control unit and recheck.
    2. NO -  Go to step 14.
  14. Turn the ignition switch OFF.
  15. Disconnect ECM connector A (32P).
  16. Check for continuity between body ground and ECM connector terminal A26.
    Fig 4: Checking Continuity Between Body Ground And ECM Connector Terminal A26
    G03692747Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES -  Repair short in the wire between the ECM (A26) and the EPS control unit.
    2. NO -  Substitute a known-good ECM (see HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES ) and recheck. If the voltage is now normal, replace the original ECM (see ECM REPLACEMENT ).
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.