You must give vehicle manufacturers information as follows so they can certify model year 2021 and later vehicles:

(a) Identify engine make, model, fuel type, engine family name, calibration identification, and engine displacement. Also identify which standards the engines meet.

(b) This paragraph (b) describes three different methods to generate engine fuel maps. Manufacturers may generally rely on any of the three mapping methods. However, manufacturers must generate fuel maps using either cycle-average or powertrain testing as described in paragraphs (b)(2) and (3) of this section for hybrid engines and hybrid vehicles. Also, vehicle manufacturers must use the powertrain method for any vehicle with a transmission that is not automatic, automated manual, manual, or dual-clutch.

(1) Combined steady-state and cycle-average. Determine steady-state engine fuel maps and fuel consumption at idle as described in §1036.535, and determine cycle-average engine fuel maps as described in §1036.540, excluding cycle-average fuel maps for highway cruise cycles.

(2) Cycle-average. Determine fuel consumption at idle as described in §1036.535, and determine cycle-average engine fuel maps as described in §1036.540, including cycle-average engine fuel maps for highway cruise cycles. In this case, you do not need to determine steady-state engine fuel maps under §1036.535. Fuel mapping for highway cruise cycles using cycle-average testing is an alternate method, which means that we may do confirmatory testing based on steady-state fuel mapping for highway cruise cycles even if you do not; however, we will use the steady-state fuel maps to create cycle-average fuel maps. In §1036.540 we define the vehicle configurations for testing; we may add more vehicle configurations to better represent your engine's operation for the range of vehicles in which your engines will be installed (see 40 1065.10(c)(1)).

(3) Powertrain. Generate a powertrain fuel map as described in 40 CFR 1037.550. In this case, you do not need to perform fuel mapping under §1036.535 or §1036.540.

(d) Provide the following information if you generate engine fuel maps using either paragraph (b)(1) or (2) of this section:

(1) Full-load torque curve for installed engines, and the full-load torque curve of the engine with the highest fueling rate that shares the same engine hardware, including the turbocharger, as described in 40 CFR 1065.510. You may use 40 CFR 1065.510(b)(5)(i) for engines subject to spark-ignition standards. Measure the torque curve for hybrid engines as described in 40 CFR 1065.510(g) with the hybrid system active.

(2) Motoring torque map as described in 40 CFR 1065.510(c)(2) and (4) for conventional and hybrid engines, respectively.

(3) Declared engine idle speed. For vehicles with manual transmissions, this is the engine speed with the transmission in neutral. For all other vehicles, this is the engine's idle speed when the transmission is in drive.