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This is from the Washington State Dept. of Ecology site.
•1996 and newer gasoline vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR).
These vehicles will receive an on-board diagnostic (OBD) test where the testing station's computer will easily and safely connect to your vehicle's computer to receive either passing or failing (trouble code) information on your vehicle.
•1995 and older gasoline vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with two-wheel or part-time four wheel drive.
These vehicles will receive an Acceleration Simulation Mode (ASM) test. These vehicles are tested on a dynamometer. All front wheel drive vehicles will be operated by inspection personnel. Motorists may operate rear wheel drive vehicles on the dynamometer. These vehicles also receive a gas cap test to verify that the gas cap seal is functional.
•Gasoline vehicles over 8500 pounds Gross Vehicle Weight Rating (GVWR) or any 1995 and older vehicle with constant 4x4 (all wheel drive) or traction control.
These vehicles will receive a two-speed idle test. The vehicle will not be driven on a dynamometer. The motorist will be instructed to reach required RPM levels while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle). These vehicles also receive a gas cap test to verify that the gas cap seal is functional.
•Diesel vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with two-wheel or part-time four wheel drive.
These vehicles will receive an opacity test that measures the density (opacity) of exhaust as it exits the vehicle's tailpipe. The vehicle is tested on a dynamometer. All front wheel drive vehicles will be operated by inspection personnel. Motorists may operate rear wheel drive vehicles on the dynamometer.
•Diesel vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with constant 4x4 (all wheel drive) or traction control.
These vehicles will receive an opacity test that measures the density (opacity) of exhaust as it exits the vehicle's tailpipe. The vehicle will not be driven on a dynamometer. The motorist will be instructed to reach required RPM levels while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle).
•Diesel vehicles over 8500 pounds Gross Vehicle Weight Rating (GVWR). These vehicles will receive a snap acceleration test.
The vehicle exhaust's density (opacity) will be measured as it exits the vehicle's tailpipe. The vehicle will not be driven on a dynamometer. The motorist will be instructed to press down on the accelerator and immediatly release it while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle).
•1996 and newer gasoline vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR).
These vehicles will receive an on-board diagnostic (OBD) test where the testing station's computer will easily and safely connect to your vehicle's computer to receive either passing or failing (trouble code) information on your vehicle.
•1995 and older gasoline vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with two-wheel or part-time four wheel drive.
These vehicles will receive an Acceleration Simulation Mode (ASM) test. These vehicles are tested on a dynamometer. All front wheel drive vehicles will be operated by inspection personnel. Motorists may operate rear wheel drive vehicles on the dynamometer. These vehicles also receive a gas cap test to verify that the gas cap seal is functional.
•Gasoline vehicles over 8500 pounds Gross Vehicle Weight Rating (GVWR) or any 1995 and older vehicle with constant 4x4 (all wheel drive) or traction control.
These vehicles will receive a two-speed idle test. The vehicle will not be driven on a dynamometer. The motorist will be instructed to reach required RPM levels while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle). These vehicles also receive a gas cap test to verify that the gas cap seal is functional.
•Diesel vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with two-wheel or part-time four wheel drive.
These vehicles will receive an opacity test that measures the density (opacity) of exhaust as it exits the vehicle's tailpipe. The vehicle is tested on a dynamometer. All front wheel drive vehicles will be operated by inspection personnel. Motorists may operate rear wheel drive vehicles on the dynamometer.
•Diesel vehicles under 8501 pounds Gross Vehicle Weight Rating (GVWR) with constant 4x4 (all wheel drive) or traction control.
These vehicles will receive an opacity test that measures the density (opacity) of exhaust as it exits the vehicle's tailpipe. The vehicle will not be driven on a dynamometer. The motorist will be instructed to reach required RPM levels while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle).
•Diesel vehicles over 8500 pounds Gross Vehicle Weight Rating (GVWR). These vehicles will receive a snap acceleration test.
The vehicle exhaust's density (opacity) will be measured as it exits the vehicle's tailpipe. The vehicle will not be driven on a dynamometer. The motorist will be instructed to press down on the accelerator and immediatly release it while the vehicle idles in park or neutral (depending on the transmission or model-year type of vehicle).
