SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSHONDA2007RIDGELINE RTSREPAIR AND DIAGNOSISDRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESREAR DIFFERENTIALDTC TROUBLESHOOTINGDTC 78-1: VTM-4 CONTROL UNIT
2007 Honda Ridgeline RTS

DTC 78-1: VTM-4 Control Unit

2007 Honda Ridgeline RTSSECTION DTC 78-1: VTM-4 Control Unit
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 DTC (see HOW TO CLEAR THE VTM-4 CONTROL UNIT MEMORY  ).
  3. Test-drive the vehicle, and check for DTCs with the HDS.

    Is DTC 78-1 indicated? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure, the system is OK at this time.
  4. Check the battery.

    Is the specified battery installed, and is it fully charged? 

    1. YES  - Go to step 5.
    2. NO  - Replace or charge the battery.
  5. Watch the charging system indicator.

    Does the charging system indicator come on with ignition switch ON (II), and go off with the engine started? 

    1. YES  - Go to step 6.
    2. NO  - Check the charging system.
  6. Check for installation of any aftermarket CB or Ham radios which may cause an RF signal interference.

    Is there an aftermarket radio installed? 

    1. YES  - Disconnect the aftermarket radio, and retest.
    2. NO  - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, replace the VTM-4 control unit.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

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

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote 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.