Troubleshooting DTCs for a solenoid or motor power supply circuit failure on Honda? Keep in mind that even though the control unit activates these components, the power supplied may come from a dedicated circuit and its own separate fuse. This is most commonly overlooked when troubleshooting transmission or VTEC solenoid circuits. If the troubleshooting leads you to replace a control unit, make sure you understand and inspect all the power supplies to that control unit first.
Checking for blown, missing or misplaced fuses can be a quick first step that can prevent unnecessary diagnostics.
Generally, solenoid or motor supply circuits will have a label of B+, VB or IG1 to indicate a power supply circuit. SOL or MOTOR is referring to the component being supplied power, but the label itself may not always read this way.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.