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Table Of Contents - Ford Expedition 1998 Workshop Manual

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Table Of Contents

Table of Contents

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Table of Contents

Special Tool(S)1

A4Wd Vacuum Schematic1

4Wd Mode Switch Input Resistances1

Inspection And Verification2

Visual Inspection Chart2

Gem Diagnostic Trouble Code (Dtc) Index2

Neutral Safety Switch Input Conditions2

Gem Parameter Identification (Pid) Reference Chart4

Pinpoint Tests6

A1 Check The Ignition States — Monitor The Pid Ign_Gem6

A2 Retrieve The Diagnostic Trouble Codes (Dtcs)6

A3 Check The 4Wabs Module Input; 4Wabs Module Connected — Monitor The Pid Pwr_Rly7

A4 Check The 4Wabs Module Input; 4Wabs Module Disconnected — Monitor The Pid Pwr_Rly7

A5 Check Circuit 239 (W/O) For Short To Power7

A6 Check Hall Effect Power Circuit For Short To Ground — Monitor The Pid Hallpwr8

A7 Check The Hall Effect Circuit For Short To Ground — Transfer Case Assembly C201 Disconnected8

A8 Check Front And Rear Hall Effect Sensors9

A9 Check Circuit 774 (Lg) For Short To Ground9

A10 Monitor The Front And Rear Hall Effect Pids Tra_Rsp And Tra_Fsp9

A11 Check The Voltage To The Hall Effect Sensors — Circuit 774 (Lg)10

A12 Check Circuit 774 (Lg) For Open10

A13 Check Circuit 682 (Db) For Open11

A14 Check The Voltage To The Hall Effect Sensors — Circuit 774 (Lg)11

A15 Check The Hall Effect Sensor Ground Circuits 682 (Db) For Open11

A16 Check Circuit 435 (Y/Lb)/722 (Lb) For Open12

A17 Check Circuit 435 (Y/Lb)/772 (Lb) For Short To Ground12

A18 Check Circuit 435 (Y/Lb)/772 (Lb) For Short To Power12

A19 Monitor The A4Wd Clutch Relay Pid 4Wdclst13

A20 Check Circuit 976 (O) For Short To Power13

A21 Check Circuit 976 (O) For Short To Ground14

A22 Check Circuit 976 (O) For Open14

A23 Monitor The A4Wd Clutch Relay Pid 4Wdclst14

A24 Monitor The Pid 4Wdclst — Rear Wheels Breaking Traction15

A25 Monitor The Pid 4Wdclst For On--- Response15

A26 Check Circuit 976 (O) For Short To Power15

A27 Check The A4Wd Output16

A28 Check Circuit 779 (Br) For Open16

A29 Check Circuit 779 (Br) For Short To Ground17

A30 Check Circuit 779 (Br) For Short To Power17

A31 Check A4Wd Clutch Relay Circuit 57 (Bk) For Open17

A32 Check The Voltage To The A4Wd Clutch Relay — Circuit 704 (Dg/Lg)17

Pinpoint Test B: The Vehicle Does Not Shift Between 2Wd/A4Wd And 4Wd Modes Properly18

B1 Check The Ignition States — Monitor The Pid Ign_Gem18

B2 Retrieve The Diagnostic Trouble Codes (Dtcs)18

B3 Check The A4Wd Indicator19

B4 Check The 4H Indicator19

B5 Check The 4L Indicator19

B6 Monitor The Mode Switch Pid 4Wdsgem20

B7 Check The Mode Switch20

B8 Check Circuit 780 (Db) For Open20

B9 Check Circuit 780 (Db) For Short To Ground21

B10 Check Circuit 780 (Db) For Short To Power21

B11 Check Circuit 682 (Db) For Open21

B12 Check Circuit 682 (Db) For Short To Power22

B13 Check The Front Axle Engagement22

B14 Check The Front Driveshaft Engagement22

B15 Check The Front Driveshaft Disengagement23

B16 Check The Front Axle Disengagement23

B17 Monitor The Pids Mtr_Ccw And Mtr_Cw — Active Command Cw/Ccw On23

B18 Monitor The Pids Mtr_Ccw And Mtr_Cw Active Command Cw/Ccw To On23

B19 Check The Voltage To The Transfer Case Shift Relays Coils — Circuit 704 (Dg/Lg)24

B20 Check Circuit 781 (O/Lb) For Open24

B21 Check Circuit 782 (Br/W) For Open24

B22 Check Circuits 781 (O/Lb) And 782 (Br/W) For Short(S) To Ground24

B23 Check Circuit 782 (Br/W) For Short To Power25

B24 Check Circuit 781 (O/Lb) For Short To Power25

B25 Check The Transfer Case Shift Relays Coils25

B26 Check The Voltage To The Transfer Case Shift Motor — Active Command Cw/Ccw On26

B27 Check The Voltage To The Transfer Case Shift Relays Switch Side — Circuit 704 (Dg/Lg)26

B28 Check The Voltage To The Transfer Case Shift Motor — Active Command Cw/Ccw Off27

B29 Check Circuits 777 (Y) And 778 (O) For Short(S) To Power27

B30 Check Circuits 777 (Y) And 778 (O) For Open27

B31 Check Circuit 777 (Y) For Open28

B32 Check Circuit 778 (O) For Open28

B33 Check The Ground To The Transfer Case Shift Relays — Circuit 57 (Bk)28

B34 Check The Contact Plate Switches — Monitor The Pids Plate_A, Plate_B, Plate_C And Plate_D29

B35 Monitor The Pid Plate_A For Open29

B36 Check Circuit 771 (P/Y) To The Contact Plate Switch A30

B37 Check Circuit 771 (P/Y) For Short To Ground30

B38 Check Circuit 771 (P/Y) For Open30

B39 Check Circuit 771 (P/Y) For Short To Power31

B40 Check Circuit 762 (Y/W) For Short To Power31

B41 Check Circuit 762 (Y/W) For Open31

B42 Monitor The Pid Plate_B For Open32

B43 Check Circuit 770 (W) To The Contact Plate Switch B32

B44 Check Circuit 770 (W) For Short To Ground32

B45 Check Circuit 770 (W) For Open33

B46 Check Circuit 770 (W) For Short To Power33

B47 Monitor The Pid Plate_C For Open33

B48 Check Circuit 764 (Br/W) To The Contact Plate Switch C34

B49 Check Circuit 764 (Br/W) For Short To Ground34

B50 Check Circuit 764 (Br/W) For Open34

B51 Check Circuit 764 (Br/W) For Short To Power35

B52 Monitor The Pid Plate_D For Open35

B53 Check Circuit 763 (O/W) To The Contact Plate Switch D35

B54 Check Circuit 763 (O/W) For Short To Ground36

B55 Check Circuit 763 (O/W) For Open36

B56 Check Circuit 763 (O/W) For Short To Power36

B57 Check The Shift Motor37

C1 Check The Ignition States — Monitor The Pid Ign_Gem37

C2 Retrieve The Diagnostic Trouble Codes (Dtcs)38

C3 Check The 4H Indicator39

C4 Check The 4L Indicator39

C5 Monitor The Mode Switch Pid 4Wdsgem39

C6 Check The Mode Switch39

C7 Check Circuit 780 (Db) For Open40

C8 Check Circuit 780 (Db) For Short To Ground40

C9 Check Circuit 780 (Db) For Short To Power40

C10 Check Circuit 682 (Db) For Open41

C11 Check Circuit 682 (Db) For Short To Power41

C12 Check Bpp Switch Pid Boo_Gem41

C13 Check The Voltage To The Bpp Switch42

C14 Check The Bpp Switch42

C15 Monitor The Tr Sensor Pid Ntrl_Sw43

C16 Check The Ground To The Digital Transmission Range (Dtr) Sensor — Circuit 57 (Bk)43

C17 Check Circuit 463 (R/W) For Open43

C18 Check The Dtr Sensor44

C19 Monitor The Vss Pid Vss_Gem44

C20 Check Circuit 676 (Pk/O) For Open44

C21 Check Circuit 679 (Gy/Bk) For Open45

C22 Check The Fuse Junction Panel Circuit Between The Gem And Circuit 676 (Pk/O)45

C23 Check The Fuse Junction Panel Circuit Between The Gem And Circuit 679 (Gy/Bk)45

C24 Check The Contact Plate Switches — Monitor The Pids Plate_A, Plate_B, Plate_C And Plate_D45

C25 Check The Pid Plate_A For Open46

C26 Check Circuit 771 (P/Y) To The Contact Plate Switch A47

C27 Check Circuit 771 (P/Y) For Short To Ground47

C28 Check Circuit 771 (P/Y) For Open47

C29 Check Circuit 771 (P/Y) For Short To Power48

C30 Check Circuit 762 (Y/W) For Short To Power48

C31 Check Circuit 762 (Y/W) For Open48

C32 Check The Pid Plate_B For Open49

C33 Check Circuit 770 (W) To The Contact Plate Switch B49

C34 Check Circuit 770 (W) For Short To Ground49

C35 Check Circuit 770 (W) For Open50

C36 Check Circuit 770 (W) For Short To Power50

C37 Check The Pid Plate_C For Open50

C38 Check Circuit 764 (Br/W) To The Contact Plate Switch C51

C39 Check Circuit 764 (Br/W) For Short To Ground51

C40 Check Circuit 764 (Br/W) For Open51

C41 Check Circuit 764 (Br/W) For Short To Power52

C42 Check The Pid Plate_D For Open52

C43 Check Circuit 763 (O/W) To The Contact Plate Switch D52

C44 Check Circuit 763 (O/W) For Short To Ground53

C45 Check Circuit 763 (O/W) For Open53

C46 Check Circuit 763 (O/W) For Short To Power53

C47 Check The Transfer Case Electric Shift Motor53

D1 Check The Ignition States — Monitor The Pid Ign_Gem54

D2 Retrieve The Diagnostic Trouble Codes (Dtcs)55

D3 Check The 4H Indicator56

D4 Check The 4L Indicator56

D5 Check The A4Wd Indicator56

D6 Check The Front Axle Engagement56

D8 Check The Front Driveshaft Disengagement57

D9 Check The Front Axle Disengagement57

D10 Check 4Wd And 2Wd Vacuum Solenoid Circuits57

D11 Check 4Wd And 2Wd Vacuum Hub Solenoids57

D12 Check Circuits 145 (Gy/Bk) And 605 (R) For Short To Power58

D13 Monitor The 4Wd And 2Wd Vacuum Solenoid Pids 4Wdsol And 2Wdsol58

D14 Check The Voltage To The 4Wd And 2Wd Vacuum Solenoids — Circuit 294 (W/Lb)58

D15 Check The 2Wd And 4Wd Vacuum Solenoid59

D16 Check Circuit 145 (Gy/Bk) For Open59

D17 Check Circuit 605 (R) For Open60

D18 Check Circuit 145 (Gy/Bk) For Short To Ground60

D19 Check Circuit 605 (R) For Short To Ground60

D20 Check The Vacuum At The 4Wd And 2Wd Vacuum Solenoids60

D21 Check The 4Wd And 2Wd Vacuum Solenoids — Closed Condition61

D22 Check The 4Wd And 2Wd Vacuum Solenoids — Open Condition61

D23 Check The Vacuum Feed Lines From The Vacuum Motor61

D24 Check The Vacuum Motor — Axle Engg On And Axle Dscn Off61

D25 Check The Vacuum Motor — Axle Engg Off And Axle Dscn On62

E1 Check The Ignition States — Monitor The Pid Ign_Gem62

E2 Check Circuit 1052 (T/Bk) For Voltage62

E3 Check The Fuse Junction Panel For Voltage62

E4 Check Gem C239-26 Circuit 875 (Bk/Lb) For Continuity To Ground63

E5 Check Gem C239-14 Circuit 875 (Bk/Lb) For Continuity To Ground63

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Navigator 1998