154 StrategiesResponding to Operating Conditions 1.3 Emisslon Control EGH Ail oi these lines sensors must Signal in the proper range belore the controi module lurns an EGR. - ECT is neiiiierioo cool ner ma riot - TPS is pan tnronie - P1P is pelween minimum rpm and maximum rpm EGR aliens Warm Cruise MS! medium The iormallon of NOx is Conlrolied by the EGR Vacuum Regulatnt (EVE) solar n The EGFI valve is opened lire proper amounr re recircu- lsle exhaust gas into '12 intake manifold. minimizing the oulpul cl No. The Delia Pressure Feedback (DFFE) sensor sands laedr back signals in me eeniroi module. veritying trial lne ECH valve is open lne proper ameuni ier rliese engine operating conditions. Calcuialrons in tiie conlroi module Subtract line EGFt liew (as unburnable) irorn tire iresri air intake ano reduce lrie luel mieclion pulses accordingly. Canister Purge Canister purge during Warm Cruise eiiecis luel iniaclion. Fuel vapors stored in liie eanisler are being purgeddrawn tnrougn me open Canislsr Purge veive iCANPi inlo the lniake maniiele to be burned in the engine. The look-upiabiesicriusi inieeiion Considerlhis ilow during Warm Cruise. Fuel-injection pulse times are siigntly shanar llian lirey would be without oanisrer purge. This delivers tire ieeal air.luei mixlure. Secondary AlrThen-nacter Dlvlllai valve 61le Thermaelor air 51%; 96:565 anws catalytic ow long conveilll runs! manlicld 52309 Fig, i-e. warm Cruise ineimaclor air now On Tnennacior-eeuipped engines (4.9L amt larger) in Warm Cruise sirelegy. the oonirci module closes iiie Thal- rrraeier Air Diverter (TAD). and opens the Tnennacier Ail ay- WARM CRUISHTHATEGV in pass ITAE), Dining Warm Cruise. |ha Thermaclor system delivers secondary air to ihe Conveniionai Oxidanon Conveli er (CDC) to assist in oxidizing the HC and CO. 1.4 Spark Timing Coniiol module - nelerminee warm engine noise mode - Caiculeles spark amuse . Finlay: svouTsigiai f): .u- .3): 9 9: M ED. Zia .. 15.: 1! "$33 ED 'Cp .2. .Q. 3 rip. w. Warm cierse liming wrltrui Spark liming is determined by the look-up tables ier Warm Cruise. Remember lnal, ata ease liming el llr 3100, the Pi? signal comes lo lne TFI 10 ETDC in Warm Cruise. me all- iuei ratio allows ior rsiatively slower burning. so line control module SPOUT signal advances liming ta apeiri sol BT00. This advance increases iuei eoonomy; il also increases HC and NC. engine-om emissions. euitne traoeoiis iavol lne ad vance Effect nl Exhaust Gas Raclrculatlon EGH iiaw during warm Cruise allecis Spark Timing be- cause the EGFI slows the huming oi lhe air~iuel mixture. Using the DPFE signal. the control module changes the SFOUT slo- nal to advance the spark timing by a law degrees to ignite the luel earlier. aliawing lor the eltecl ol the BER. 1.5 Throttle Air Bypass (I50) From its original name el idle Speed Control (ISC-BPAi, in. Throttle Ail Bypass would seem in ire operetive oniy ai idle. Bul no. The Warm Cruise bypass signals are 100% duty cycle to rinve lne bypass lull open. Fuli open bypass iiow prepares ior aecelerallcn. It's ready to close slowly like a oaenpci la is ouee emisslons, wrien luliycloeeo. ii plovldas engine braking, and, al low engine speeds. ilppens to prevent engine slallirig