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HOMESERVICE MANUALSHONDA2007RIDGELINE RTSREPAIR AND DIAGNOSISDRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESREAR DIFFERENTIALDTC TROUBLESHOOTINGDTC 26-1: VSA MODULATOR CONTROL UNIT OR WIRE HARNESS
2007 Honda Ridgeline RTS

DTC 26-1: VSA Modulator Control Unit or Wire Harness

2007 Honda Ridgeline RTSSECTION DTC 26-1: VSA Modulator Control Unit or Wire Harness
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch ON (II).
  2. Clear the DTCs (see HOW TO CLEAR THE VTM-4 CONTROL UNIT MEMORY  ).
  3. Test-drive the vehicle, and check for DTCs with the HDS.

    Is DTC 26-1 indicated? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure, the system is OK at this time.
  4. Check for DTCs in the VSA system with the HDS.

    Are there any VSA DTCs indicated? 

    1. YES  - Go to the indicated DTCs troubleshooting.
    2. NO  - Go to step 5.
  5. Turn the ignition switch OFF.
  6. Raise the vehicle, and make sure it is securely supported.
  7. Turn the ignition switch ON (II).
  8. Measure the voltage between the No. 3, No. 5, No. 7, and No. 9 terminals of the VTM-4 control unit connector A (22P) and body ground while rotating the appropriate wheel one rotation a second.
    APPROPRIATE WHEEL AND TERMINALS

    Appropriate wheel Appropriate Terminal
    Left-front A9
    Right-front A7
    Left-rear A5
    Right-rear A3
    Fig 1: Measuring Voltage Between A3, A5, A7, And A9 Terminals Of VTM-4 Control Unit And Body Ground
    G03689712Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Are all four readings about 2 V to 3 V? 

    1. YES  - Check for loose terminal fit in the VTM-4 control unit. If it is normal, replace the VTM-4 control unit (see VTM-4 Control Unit Replacement ).
    2. NO  - Check for poor connections or loose terminals between the VTM-4 control unit and the VSA modulator-control unit. If the connections are OK, replace the VSA modulator assembly (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).
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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.