![]() To identify your ECU you will need to know its generation, part number and possibly its ROM number. The cell number was increased to 600 cells per square inch for faster lightoff, while providing more surface area to convert hydrocarbons.Technical Information ECU Identification Identifying your ECU The catalyst is located under the floor and uses a substrate with a higher Palladium content and modified precious-metal layering. The ULEV Accord engine uses a 1.7-liter, high-efficiency catalyst. ![]() The manifold is a four-into-one branch design. An air gap between the manifold's inner and outer walls insulates the system and ensures that exhaust heat continues to the catalyst. Since a large mass of metal, such as a cast manifold, can act as a heat sink, the manifold is a dual-wall design made out of tubular steel. The exhaust system solves the problem of passing combustion heat to the catalyst as soon as possible. The ULEV engine uses a rotary air-control valve that also controls the Air-Assist Injection system, in place of the electric air-control valve and fast-idle valve used in the previous Accord. The ULEV fuel-injection system also utilizes the precise EGR control provided by the Accord engine's electronic EGR valve. The ULEV engine PCM can also compensate for mixture inaccuracies caused by fuel-droplet adhesion to the intake port walls during cold start-up (a major reason for a high level of unburned hydrocarbons during the warm-up cycle). In addition to the normal sensor inputs, such as throttle position, coolant temperature, air temperature, etc., the ULEV engine has two air-fuel ratio sensors: a linear air-fuel sensor in the exhaust manifold and a stoichiometric sensor between the front and rear beds of the underfloor catalytic converter. The ULEV engine-programmed fuel-injection system is an adaptive type that uses a new 32-bit microprocessor Powertrain Control Module (PCM) with the capability to monitor and control the air-fuel ratio in each individual cylinder. In addition to the electronic EGR control and lean combustion afforded by the VTEC swirl-combustion process, the ULEV engine uses precise air-fuel control made possible by a Linear Air-Fuel sensor, secondary oxygen sensor, high-performance catalyst and new 32-bit fuel-injection microprocessor.Ī special low heat-mass exhaust system and underfloor catalyst aid in achieving a lean air-fuel mixture during the critical warm-up period of engine operation. The ULEV (Ultra-Low Emission) engine used on the Accord EX model with automatic transmission uses several new technologies to achieve its remarkably low emissions output. More in-depth on the F23A4 ULEV engine: Honda Accord - ULEV Engine and Transmission. ![]() This engine has a different exhaust manifold, a more restrictive intake manifold and cylinder head, and a 32-bit ECU that uses an AFR (Air Fuel Ratio) oxygen sensor when compared to the F23A1. It is substantially similar to the F23A1, but features ULEV certification with a slight reduction of power: 148 hp (108 kW) with a maximum torque of 150 lb
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