The Mazda RC4A-3L

摘要

From 2004 to 2006,the Mazda RX8 used a 4-speed, fully electronic transmission from JATCO called the JR405E. Mazda calls it the RC4A-EL transmission. Approximately 48,000 of these cars using this transmission were sold in the U.S. Around the world, it has had a bit longer of a life. In fact it was used in the Chevrolet Colorado from 2004 to 2011. Here in the U.S., the 4L60E transmission was used. I don't know how many of these 48,000 are still on the road today, but every once in a while we get a call on this transmission. And the rare times this transmission shows up on your door step, it's good to have some information so you can diagnose and repair the vehicle. A good place to start is with a simple component application chart as seen in Figure 1. The location of the clutch assemblies inside the transmission are provided in Figure 2. The application chart also provides solenoid and pressure switch activity which we will go over further in this article. But for now, a quick look at the application chart in Figure 1 shows how the Low clutch is on for 1st, 2nd, and 3rd gear and releases in 4th. When a shift into 2nd takes place, the 2-4 brake is applied. This makes the 1-2 shift transition non-synchronous in that no timing is involved in releasing one clutch and applving another.