2006 LAND ROVER FRELANDER 2 engine

Publishe d: 11-May-2011
Climate Control - Control ComponentsDescripti on a nd O pe ration
COMPONENT LOCATION
ItemPart NumberDe scription1-Refrigera nt press ure sens or2-Cabin humidi ty s ensor (if fitt ed)3-Air Condi tioning (A/C) compressor (i6 shown)4-Engine Coola nt Temperat ure (ECT) s ensor5-Ambi ent air t emperat ure sensor6-Air intake ste ppe r motor

7-P ollution sensor (if fi tted)8-W indshie ld distri buti on (defrost) ste pper motor9-Right Hand (RH) tempera ture ble nd s tepper mot or10-Sunload s ens or11-Cabin temperature se nsor12-Automati c Te mpe rature Cont rol (ATC) modul e13-Evaporator te mpe rature s ens or14-Left Hand (LH) te mpe rature blend st eppe r motor15-Blowe r motor control module16-Face/feet dis tribution ste ppe r motor17-Blowe r motor
OVERVIEW
The clima te cont rol s yste m i ncorpora tes the hea ting, ve ntila tion and A/C systems. There are 2 mai n types of clima te controls yste m a vail able ;
a single z one ma nual sys tema dua l zone a utomati c system.
The clima te cont rol f unct ions for bot h systems a re controlle d by the ATC modul e. The ATC module is mounted in the ce nte rcons ole a nd cont ains bot h the syste m e lectronic sof twa re a nd user cont rols .
The ATC module works in conjunction wi th a number of othe r ve hicle control module s, i ncluding the Engine Control Module(ECM), which control s a number of cl ima te control sub-s yste ms on recei pt of reques ts f rom the ATC module .
The s ingle zone climate cont rol s yst em f eat ures ma nual control for air t empera ture , air dist ribution and air source, although as mal l amount of aut oma tic control does exis t in the ATC softwa re. In re sponse to s yste m i nput s, t he ATC module cont rols theopera tion of 3 st epper motors mounted on t he heat er as sembly. The st eppe r motors then a djust the positi on of the ai rt emperat ure, air dist ribution and air source flaps accordingly.
The dual zone cl imat e control system fe atures a utomati c control of air t empera ture , air dis tribution and blower motor s pee d.The ATC module is a lso able to cont rol i ndividua l te mpe rature re que sts for both the dri ver a nd pass enger s ide of the cabin.
• NO TE: The ATC module can only maint ain a maximum tempera ture dif fere nce bet wee n the 2 side s of the cabin of up toa pproximate ly 3ºC (4ºF). This is due to the moveme nt a nd mix of a ir wi thin the cabin.
The dual zone cl imat e control system fe atures 2 additional sens ors; a cabin temperature se nsor and a sunload sensor. Thecabin temperature se nsor provides a temperature fe edback to e nabl e the ATC module s oftware mai ntai n a cons tant ca bint emperat ure. The sunloa d se nsor provide s a rea ding of s ola r loa ding on the vehicle occupants a nd enables the ATC module toa djus t the output from t he clima te control s yste m a ccordingly.
Higher specif icat ion vers ions of t he dual zone cl imat e control system are al so a vailable . These syst ems fea ture 2 morea ddit iona l se nsors; a polluti on s ensor and a cabin humidity sensor.
The pollution sensor det ects pol luta nts ente ring the cabin, allowing the ATC modul e to rea ct by cha ngi ng t he posit ion of thea ir intake fla p. The cabin humidi ty s ensor ca lcul ates the probability of misti ng on the winds hiel d. The ATC module monitorst he s igna l from t he cabin humidi ty s ensor and a djus ts blowe r speed, air dis tribution and A/C compress or di spla cementa ccordingly.
Stop/Start Vehicles - From 2010 MY
To support the Stop/Start system, a number of changes have be en made to the logic and opera tion of climate cont rol s yst emwithi n a Stop/Sta rt cycle to:
maint ain occupant comfortpreve nt winds hie ld mistingconse rve batt ery power.
This has bee n achieved by the ATC (automa tic t emperat ure control) module monitoring and varying when nece ssary, va riousclima te control funct ions wit hin a St op/Start cycle.For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
To maint ain the cabi n te mpe rature when the engine is s hut down in a St op/Start cycle, an a uxil iary electric coolant-pump hasa lso bee n int egra ted into the cooling system to mai ntai n the coolant flow t hrough t he cabi n’s heat er core. The pump isdirectly hardwire d to the ECM. O n ve hicl es fi tted wit h a FFH (fue l fired heat er), the FFH coolant pump i s uti lize d and activa tedvia t he FFH.For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
• NO TE: From 2010 MY , the 'ECO N' s witch will be la bele d ‘A/C’ t o prevent confusion wit h the ‘Eco’ s witch which ope rate s the‘Stop/Sta rt’ a nd 'Gea r Change Indica tor' syst ems .
ATC MODULE

a utomati c control.
Air distri buti on can be re turned t o automatic control by pres sing the 'AUTO' swi tch loca ted in the ce nte r of the blower motorrotary controller. Thi s wi ll ill uminate the 'AUTO' LED and allow t he ATC module to control a ir di stribution in line wit h it s'comfort' algorithm
Air distri buti on is control led by 2 air dist ribution doors. The ATC module control s the position of the air dis tribution doors byprovi ding LIN bus me ssa ges to t he door ste pper motors . Ha ll ef fect sensors located wit hin the stepper mot ors inform t he ATCmodule t hat moveme nt of the st epper motors is taking place.
ECON - Single Zone Manual System
P ress ing the 'ECO N' moment ary swit ch on the control pa nel will swi tch off t he A/C s yste m. W he n s elected, the ATC modulewill t rans mit a mess age ove r the high speed CAN bus to the ECM re que sting the A/C compressor is dis able d. The ECMdisables the compres sor by de-e nergizing the A/C compress or control re lay loca ted in the BJB. The tell-tale LED in the swit chwill i lluminat e to ale rt the ve hicl e occupants tha t the system is in 'ECO N' mode .
W he n 'ECON' mode i s se lect ed, tempera ture control is s till a vai lable but no cooling of i ntake ai r wi ll ta ke place . The minimumoutput a ir te mpe rature f rom the sys tem will be ambient air tempera ture plus any heat pick up in the ai r int ake pat h.
A/C can be s witched back on by pres sing the 'ECON' swi tch a se cond time. This will als o extinguish the 'ECON' LED.
Stop/Sta rt Ve hicl es - From 2010 MY
From 2010 MY , t he 'ECON' switch wi ll be labeled ‘A/C’ to pre vent confus ion with the ‘Eco’ switch which operates the‘Stop/Sta rt’ a nd 'Gea r Change Indica tor' syst ems .For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
ECON - Dual Zone Automatic System
P ress ing the 'ECO N/O FF' momentary swi tch in the control pa nel will swi tch off t he A/C s yste m. W he n s elected, the ATCmodule will t rans mit a mess age ove r the high speed CAN bus to the ECM re que sting the A/C compress or is dis able d. The ECMdisables the compres sor by de-e nergizing the A/C compress or control re lay loca ted in the BJB. The 'ECO N' t ell-tale LED in t hes witch will il lumi nate to alert the ve hicle occupa nts that the sys tem is i n 'ECON' mode.
W he n 'ECON' mode i s se lect ed, tempera ture control is s till a vai lable but no cooling of i ntake ai r wi ll ta ke place . The minimumoutput a ir te mpe rature f rom the sys tem will be ambient air tempera ture plus any heat pick up in the ai r int ake pat h.
A second pre ss of the 'ECON/OFF' switch wil l ext inguish the 'ECO N' LED and illuminate the 'OFF' LED. W hen in 'OFF' mode t heATC module sets the blower mot or s pee d to 0. Air distri buti on i nto the cabi n wi ll remai n as pre viously sele cted. Al l LED's ont he control pane l wil l be ext inguishe d, a lthough night ti me illumina tion will remain acti ve.
• NO TE: W he n in 'OFF' mode , the he ated se at, heat ed windshie ld a nd heat ed rear window functions wi ll st ill be availa ble.
A thi rd press of t he 'ECO N/O FF' s wit ch re turns the s yste m to norma l (A/C) operation and extinguishes t he 'OFF' LED. Thes yste m can be re turned to a utomati c operat ion at a ny t ime by press ing the 'AUTO' swit ch mounted in t he cent ral (blowermotor) rotary control ler.
Stop/Sta rt Ve hicl es - From 2010 MY
From 2010 MY , t he 'ECON' switch wi ll be labeled ‘A/C’ to pre vent confus ion with the ‘Eco’ switch which operates the‘Stop/Sta rt’ a nd 'Gea r Change Indica tor' syst ems .For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
Programmed Defrost
The programmed def rost function is only ava ilable on ve hicl es fi tted wit h a dua l zone heati ng, vent ilat ion a nd A/C syst em.The f unction is s elected by press ing the 'PRO G' moment ary swit ch on the control pa nel. W hen s ele cted, the ATC moduleprovi des maximum winds hie ld de fros ting/de mist ing by confi guri ng t he s yste m a s follows:
'AUTO ' mode offIntake air set to fres h airAir di stribution se t to windshieldBlowe r motor spe ed s et t o maximumHeate d winds hiel d onRear window hea ter on.
W he n progra mmed defrost is sel ecte d, t he s et t emperat ure will remain unchanged. Programme d de fros t ca n be cancell ed bya ny of the following met hods:
P ress ing any air distribut ion moment ary swit chP ress ing the 'AUTO' s witch locate d in the center of t he blowe r motor rot ary cont rolle rP ress ing the 'PRO G' momenta ry s witch a second time .
• NO TE: Blower motor speed can be adjuste d wi thout te rmi nating programmed defrost.
Windshield Heater
The windshie ld heate r comprises 2 heate r el eme nts , LH and RH, bonded be twee n the glass laminat ions . The s yste m iss witched on by press ing the momentary swi tch l ocat ed on t he control panel . W hen selected, the ATC module t rans mits aheat ing request on t he high spe ed CAN bus to t he CJB. On rece ipt of the messa ge, the CJB ene rgiz es t he windshie ld heate rrelay loca ted in t he BJB by provi ding a ground path for t he relay coi l. The energized rela y provides a ba ttery fe ed t o bothheat er el eme nts . Aft er a period of 4 minutes the ATC module re moves t he request for windshie ld heati ng. The CJB the npowe rs down the windshield hea ter by re moving the ground pat h for the rel ay coil.
The ATC module will only reques t wi ndshield he ater ope rati on if the engine is runni ng. An e ngi ne s tatus si gnal is provi ded tot he ATC module by t he ECM over the high speed CAN bus.

Rear Window Heater
The rear window hea ter comprise s a single heat er e leme nt bonded to the inner surf ace of t he glass . The syste m is swi tche don by pre ssing the mome nta ry s witch locate d on the control panel. W he n se lected, the ATC module tra nsmits a he atingreque st on the high spee d CAN bus to the CJB. On recei pt of the me ssa ge, the CJB energiz es t he rear window hea ter relayl ocat ed i n the Auxilia ry Junct ion Box (AJB) by providing a ground pa th for the re lay coil. The energiz ed relay provide s a bat teryf eed to t he heat er e leme nt. Afte r a period of 12 minute s the ATC module re moves the heat ing request . The CJB then powe rsdown the rea r wi ndow he ate r by removing the ground pa th f or t he relay coil .
The ATC module will only reques t re ar window heate r opera tion if the e ngine is running. An engine stat us s ignal is provide d tot he ATC module by t he ECM over the high speed CAN bus.
Exterior Mirror Heaters
O peration of the ext erior mirror heat ers is fully a utomat ic a nd re qui res no input from the driver. The exterior mirror hea tersa re a ctive when the ambient air tempera ture is below 5°C (41°F) and e ngine coolant te mpe rature i s be low 65° C (149° F).Ambi ent air a nd engine coola nt t empera ture val ues are provided by the ECM on the high speed CAN bus. O n re ceipt of the set emperat ure values, the CJB det ermines if e xterior mirror he ating is require d.
The CJB requests exterior mirror hea ting by transmit ting a high spe ed CAN bus mes sage to bot h the drivers and pa sse ngerdoor module s. The door modules provide fee d and ground paths to the respecti ve e xterior mirror he ating el eme nts . W hena mbi ent and engine cool ant tempera ture ris es a bove the va lues sta ted earl ier, the CJB transmi ts a high speed CAN busmess age to the door module s ca nce lling the hea ting reques t.
Seat Heaters
O peration of the sea t he aters is controll ed by the ATC module on re ceipt of a heati ng reque st f rom either of the se at heat ermomenta ry s witches loca ted on the cont rol pane l. The s witches are mounte d in the LH and RH rota ry controllers. A singlepress of a se at heat er switch wi ll implement low level heati ng a nd illumina te a tell-tale LED. A second pre ss of the switch willi mple me nt high l eve l hea ting and ill uminate 2 te ll-t ale LED's. A third press of t he s witch will turn t he s eat hea ter off.
Seat hea ting request s are transmitte d from the ATC module to the seat hea ter control modules on the LIN bus . Two se atheat er control modul es a re f itted, one under each front seat . The se at heat er control modules provide an e lect rical supply tot he s eat hea ter e lement s and a tempera ture sensor loca ted in t he s eat cus hion.
The s eat hea ter cont rol module provides a 5 V reference fee d to the sea t he ate r te mpe rature s ensor. The s eat hea tert emperat ure sensor is an NTC thermistor. By monitoring the ret urne d voltage, t he control module can calculate thet emperat ure of t he s eat. If t he t empera ture rise s above the target tempera ture , the control module wi ll dis abl e operat ion oft he heat er e leme nts .

Cut t he A/C pi pes at the marked posi ti on.17.
18.
Guide the cut evaporat or pipes through the bulkhead s ot hat approximately 20mm i s vis ibl e in the enginecompart ment.
19.

blanking caps.
Remove t he TXV as sembl y from t he s ervice replacement evaporator
pipes .
Guide the s ervi ce replacement evaporator pi pes t hrough t he
bulkhead s o that approximat ely 20mm is vi s ible in t he engine
compart ment.
7.
Inst all t he TXV capt ive clampi ng plat e.
8. 9.
NOTE: Ins t al l new O-ri ng seal s.
Inst all t he s ervice repl acement evaporat or pipes t o the
evaporator.
T orque: 5 Nm 9.
Inst all t he CJB bracket .
T orque: 10 Nm 10.
Secure t he wiring harnes s es to the CJB bracket.
11.
Inst all t he CJB.
12.
Connect t he 5 elect rical connectors to the CJB and s ecure t he front
carpet.
13.
Inst all t he CJB lower acces s cover.
14.
Inst all t he pas s enger s ide footwel l duct .
15.
Inst all t he glove compartment .
Refer t o: Glove Compart ment (501-12 Ins trument Panel and
Consol e, Removal and Ins t al lat ion).
16.
Inst all t he RH floor cons ole ext ens ion.
17.
18. NOTE: Ins tal l new O-ring seals .
Inst all t he TXV as sembl y.
T orque: 4 Nm 18.
19. NOTE: Ins tal l new O-ring seals .
Connect t he A/C pipes t o the TXV and ti ght en t he M6 nut .
T orque: 9 Nm 19.
Inst all t he ant i-t heft alarm horn wit h i nt egral batt ery.
20.
Inst all t he plenum chamber panel.
21.

Carefully eas e apart and break the pl ast ic pi pe covers .17.
Cut t he A/C pi pes at the marked posi ti on.18.
Remove t he remai nder of t he plas ti c pipe covers.19.
Guide the cut evaporat or pipes through the bulkhead s ot hat approximately 20mm i s vis ibl e in the enginecompart ment.
20.

Inst all t he s ervice door. Secure t he 4 cli ps.
Inst all t he 4 s crews .4.
Apply t he as phal t tape from the servi ce kit t o t he
s ervice replacement evaporator pipes .
5.
6. CAUTION: Make s ure that all openi ngs are s ealed. Us e new
blanking caps.
Remove t he TXV as sembl y from t he s ervice replacement evaporator
pipes .
6.
Guide the s ervi ce replacement evaporator pi pes t hrough t he
bulkhead s o that approximat ely 20mm is vi s ible in t he engine
compart ment.
7.
Inst all t he TXV capt ive clampi ng plat e.
8. 9.
NOTE: Ins t al l new O-ri ng seal s.
Inst all t he s ervice repl acement evaporat or pipes t o the
evaporator.
T orque: 5 Nm 9.