Questions and Answers

Honda Civic DTC 19 Q. Mr. Ciulla, First let me thank you. I recently found your article on Honda main relays, which helped me resolve a two-year problem with my Civic. Thanks for putting that information on the web. Now then, on to the problem. I have an 1988 Honda Civic LX, 1.5 liter with automatic transmission, A/C, PGM-FI, and over 185,000 miles.

My Check Engine Light has been on since I bought it used a while back. The ECU code is 19, which indicates the lock-up control solenoid valve. After a recent internet search, I found one or two references to this component, but cannot seem to find any explanation of what the lock-up control solenoid valve does, or how to test/replace one that is defective. Any light you can shed on this would be great.

Lyle
Loyal Civic owner since 1990

A. The Lock-up Control Solenoid Valve, is more commonly known as the Torque Converter Clutch (TCC) Solenoid. This valve, used on Honda Civic, Honda Civic Wagon with the 1.5 liter engine and standard Honda CRX models with automatic transmission, controls the lock-up function of the torque converter.

Here is how to troubleshoot DTC 19.