Japan: Heavy-duty: 13-Mode

The 13-mode cycle replaced the older 6-mode cycle for the testing of heavy duty engines in Japan. It was used until 2005, when it was replaced by the current JE05 test.

The 13 Mode test includes a sequence of 13 steady-state modes. The emissions are averaged over the entire cycle using a set of weighting factors and are expressed in g/kWh. The test emphasizes low-speed driving conditions, is characterized by low average engine loads and low exhaust temperatures.

There are differences in some test modes for diesel and gasoline/LPG engines and the weighting factors are different.