Ford Expedition 1998 Workshop Manual
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Ford Expedition 1998 Workshop Manual

Ford Expedition 1998 Workshop Manual

Transfer case
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1998 Expedition/Navigator Workshop Manual
SECTION 308-07A: Transfer Case — General Information
DIAGNOSIS AND TESTING

Transfer Case

Refer to Wiring Diagrams Cell 34 (Expedition, Navigator), All-Wheel Drive for schematic and connector information.
Refer to Wiring Diagrams Cell 59 (Expedition, Navigator), Generic Electronic Module for schematic and connector information.

Special Tool(s)

Digital Multimeter
418-F082 (105-R0005)1 or equivalent
New Generation STAR (NGS) Tester
418-F048 (007-00500) or equivalent
Vacuum Pump
416-D001 (D83L-7059-A) or equivalent

A4WD Vacuum Schematic

A4WD Vacuum Schematic
Table 1 — 4WD Mode Switch Input Resistances
Mode Switch Position Resistance (Ohms)
2WD
3700-4100
A4WD
1400-1600
4WD HIGH
645-715
4WD LOW
225-255
Table 2 — 4x4 Shift Motor Relay Outputs
http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/...
Page 1 of 64
1998 Expedition/Navigator Workshop Manual
Procedure revision date: 05/06/2002
8/30/2010

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  • Page 1 1998 Expedition/Navigator Workshop Manual Page 1 of 64 SECTION 308-07A: Transfer Case — General Information 1998 Expedition/Navigator Workshop Manual DIAGNOSIS AND TESTING Procedure revision date: 05/06/2002 Transfer Case Refer to Wiring Diagrams Cell 34 (Expedition, Navigator), All-Wheel Drive for schematic and connector information. Refer to Wiring Diagrams Cell 59 (Expedition, Navigator), Generic Electronic Module for schematic and connector information.
  • Page 2 1998 Expedition/Navigator Workshop Manual Page 2 of 64 HI-to-LO LO-to-HI Mode GROUND 4 HIGH to 4 LOW GROUND 4 LOW to 4 HIGH GROUND GROUND Brake Motor Table 3 — Neutral Safety Switch Input Conditions Transmission State Start/Clutch Depressed Input Transmission Range Sensor Input In Gear Open Open...
  • Page 3 1998 Expedition/Navigator Workshop Manual Page 3 of 64 Demand B1318 Continuous, On- Battery voltage LOW, less than 10 volts. REFER to Section 414-02. Demand B1322 On-Demand LF door open warning circuit short to ground, or door open. REFER to Section 417-02.
  • Page 4 1998 Expedition/Navigator Workshop Manual Page 4 of 64 B1614 On-Demand Rear wiper mode select switch circuit short to ground. REFER to Section 501-16. B1814 Continuous, On- Rear wiper DOWN relay coil open or short to ground. REFER to Section 501-16. Demand B1816 Continuous...
  • Page 5 1998 Expedition/Navigator Workshop Manual Page 5 of 64 IGN_GEM 297 (BK/LG), 1040 (R/LB), 32 (R/LB), 687 (GY/Y) Ignition Switch States START, RUN, OFF, ACC IGN_KEY 158 (BK/PK) Ignition Key-In/Out IN, OUT INTLMP 402 (O/LG) Fuse Junction Panel (Internal) Interior Lamp Relay Circuit ON---, OFF---, ON-B-, ON O-G LGATE_SW 700 (W/PK)
  • Page 6 1998 Expedition/Navigator Workshop Manual Page 6 of 64 GEM. No Communication With the Module — GEM Fuses. GO to Pinpoint Test Circuitry. GEM. Pinpoint Tests PINPOINT TEST A: A4WD INDICATOR FLASHES WHEN THE A4WD MODE IS SELECTED NOTE: The vehicle has to be driven in A4WD 30 mph or greater and/or encounter a slip condition before the A4WD lamp will flash for certain faults. NOTE: Complete the entire pinpoint test related to the symptom before replacing the GEM.
  • Page 7 1998 Expedition/Navigator Workshop Manual Page 7 of 64 If DTC P1826, REPAIR all other DTCs first, then GO to If DTC P1828, GO to Pinpoint Test If DTC P1830, GO to Pinpoint Test If DTC P1832, GO to Pinpoint Test If DTC P1834, GO to Pinpoint Test If DTC P1836, GO to...
  • Page 8 1998 Expedition/Navigator Workshop Manual Page 8 of 64 GEM C240 Measure the voltage between GEM C240-1, circuit 239 (W/O), and ground. Is any voltage indicated? REPAIR circuit 239 (W/O). CLEAR the DTCs. TEST the system for normal operation. REPLACE GEM; REFER to Section 419-10.
  • Page 9 1998 Expedition/Navigator Workshop Manual Page 9 of 64 Monitor the PID HALLPWR. Does the PID HALLPWR indicate OFF? GO to A9. GO to A8. A8 CHECK FRONT AND REAR HALL EFFECT SENSORS Measure the resistance between transfer case assembly C201 pin 2, circuit 772 (LB) component side and transfer case assembly C201 pin 6, circuit 682 (DB) component side;...
  • Page 10 1998 Expedition/Navigator Workshop Manual Page 10 of 64 Monitor the PIDs TRA_RSP, TRA_FSP and VSS_GEM. Drive the vehicle at 48 kph (30 mph) or greater. Are the PIDs TRA_RSP and TRA_FSP within 3 kph (2 mph) of the VSS_GEM? GO to A19. If both PIDs TRA_RSP and TRA_FSP indicate 0 kph, GO to If only one PID indicates 0 kph, GO to If both PIDs indicate greater than 0 kph, but are not within 3 kph ( 2 mph) of each other, check for possible Hall...
  • Page 11 1998 Expedition/Navigator Workshop Manual Page 11 of 64 Are the resistances less than 5 ohms? REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 774 (LG). CLEAR the DTCs. TEST the system for normal operation. A13 CHECK CIRCUIT 682 (DB) FOR OPEN GEM C239 Measure resistance between transfer case assembly C201-6, circuit 682 (DB), and GEM C239-21, circuit 682...
  • Page 12 1998 Expedition/Navigator Workshop Manual Page 12 of 64 GEM C239 If the rear Hall effect sensor is not indicating properly, measure the resistance between transfer case assembly C201-6, circuit 682 (DB), and GEM C239-21, circuit 682 (DB). If the front Hall effect sensor is not indicating properly, measure the resistance between transfer case assembly C201-8, circuit 682 (DB), and GEM C239-21, circuit 682 (DB).
  • Page 13 1998 Expedition/Navigator Workshop Manual Page 13 of 64 C201-2, circuit 772 (LB), and ground. If the front Hall effect sensor is not indicating properly, measure the voltage between transfer case assembly C201-4, circuit 435 (Y/LB), and ground. Is any voltage indicated? REPAIR circuit 435 (Y/LB)/772 (LB).
  • Page 14 1998 Expedition/Navigator Workshop Manual Page 14 of 64 GO to A21. A21 CHECK CIRCUIT 976 (O) FOR SHORT TO GROUND A4WD Clutch Relay C293 Measure the resistance between A4WD clutch relay C293-D, circuit 976 (O), and ground. Is the resistance greater than 10,000 ohms? GO to A22.
  • Page 15 1998 Expedition/Navigator Workshop Manual Page 15 of 64 GO to and verify all other DTCs are repaired. A24 MONITOR THE PID 4WDCLST — REAR WHEELS BREAKING TRACTION Monitor the PID 4WDCLST. Verify the vehicle is in A4WD mode. Position the rear wheels on a loose or slippery surface. Accelerate briefly to get the rear wheels to break traction. Does the A4WD lamp begin to flash and the PID 4WDCLST indicate OFF? GO to A25.
  • Page 16 1998 Expedition/Navigator Workshop Manual Page 16 of 64 Is any voltage indicated? REPAIR circuit 976 (O). CLEAR the DTCs. TEST the system for normal operation. REPLACE the A4WD clutch relay. CLEAR the DTCs. TEST the system for normal operation. A27 CHECK THE A4WD OUTPUT Transfer Case Assembly C201 NOTE: The CLCH SOL active command is located in the Shift Clutch Control active command menu.
  • Page 17 1998 Expedition/Navigator Workshop Manual Page 17 of 64 A29 CHECK CIRCUIT 779 (BR) FOR SHORT TO GROUND Measure the resistance between transfer case assembly C201-16, circuit 779 (BR), and ground. Is the resistance greater than 10,000 ohms? GO to A30. REPAIR circuit 779 (BR).
  • Page 18 1998 Expedition/Navigator Workshop Manual Page 18 of 64 Is the voltage greater than 10 volts? REPLACE the A4WD clutch relay. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 704 (DG/LG). CLEAR the DTCs. TEST the system for normal operation. PINPOINT TEST B: THE VEHICLE DOES NOT SHIFT BETWEEN 2WD/A4WD AND 4WD MODES PROPERLY NOTE: Complete the entire pinpoint test related to the symptom before replacing the GEM.
  • Page 19 1998 Expedition/Navigator Workshop Manual Page 19 of 64 If DTC P1810, REFER to Section 413-01. If DTC P1812, GO to Pinpoint Test If DTC P1815, GO to Pinpoint Test If DTC P1820, GO to If DTC P1822, GO to If DTC P1824, GO to Pinpoint Test If DTC P1826, GO to Pinpoint Test...
  • Page 20 1998 Expedition/Navigator Workshop Manual Page 20 of 64 B6 MONITOR THE MODE SWITCH PID 4WDSGEM Monitor the PID 4WDSGEM. Rotate the mode switch through the 2H, A4WD, 4H, and 4L positions. Does the PID 4WDSGEM agree with the A4WD switch positions? GO to B13.
  • Page 21 1998 Expedition/Navigator Workshop Manual Page 21 of 64 Is the resistance less than 5 ohms? GO to B9. REPAIR circuit 780 (DB). CLEAR the DTCs. TEST the system for normal operation. B9 CHECK CIRCUIT 780 (DB) FOR SHORT TO GROUND Measure the resistance between mode switch C230-3, circuit 780 (DB), and ground.
  • Page 22 1998 Expedition/Navigator Workshop Manual Page 22 of 64 Is the resistance less than 5 ohms? GO to B12. REPLACE circuit 682 (DB). CLEAR the DTCs. TEST the system for normal operation. B12 CHECK CIRCUIT 682 (DB) FOR SHORT TO POWER Measure the voltage between mode switch C230-2, circuit 682 (DB), and ground.
  • Page 23 1998 Expedition/Navigator Workshop Manual Page 23 of 64 Verify the front and rear driveshaft both spin. Is the transfer case locking the front driveshaft to the rear driveshaft? GO to B15. If the transfer case is not working properly, GO to B15 CHECK THE FRONT DRIVESHAFT DISENGAGEMENT Place the mode switch in the 2H position.
  • Page 24 1998 Expedition/Navigator Workshop Manual Page 24 of 64 B19 CHECK THE VOLTAGE TO THE TRANSFER CASE SHIFT RELAYS COILS — CIRCUIT 704 (DG/LG) Transfer Case Shift Relays C221 Measure the voltage between transfer case shift relays C221-5, circuit 704 (DG/LG), and ground. Is the voltage greater than 10 volts? GO to B20.
  • Page 25 1998 Expedition/Navigator Workshop Manual Page 25 of 64 Are the resistances greater than 10,000 ohms? GO to B25. REPAIR circuit 781 (O/LB) and/or circuit 782 (BR/W). CLEAR the DTCs. TEST the system for normal operation. B23 CHECK CIRCUIT 782 (BR/W) FOR SHORT TO POWER Transfer Case Shift Relays Module C221 GEM C241 Measure the voltage between transfer case shift relays C221-8, circuit 782 (BR/W), and ground.
  • Page 26 1998 Expedition/Navigator Workshop Manual Page 26 of 64 Measure the resistance between transfer case shift relays terminal 5 and terminal 8; and between terminal 5 and terminal 9. Are the resistances between 60 and 160 ohms? REPLACE the GEM; REFER to Section 419-10.
  • Page 27 1998 Expedition/Navigator Workshop Manual Page 27 of 64 GO to B31. REPAIR circuit 704 (DG/LG). CLEAR the DTCs. TEST the system for normal operation. B28 CHECK THE VOLTAGE TO THE TRANSFER CASE SHIFT MOTOR — ACTIVE COMMAND CW/CCW OFF NOTE: The CW/CCW active command is located in the 4-Wheel Electronic Shift active command menu. Set the active command CW/CCW to OFF.
  • Page 28 1998 Expedition/Navigator Workshop Manual Page 28 of 64 Are the resistances less than 5 ohms? RECONNECT the transfer case assembly. GO to GO to B33. B31 CHECK CIRCUIT 777 (Y) FOR OPEN Measure the resistance between transfer case shift relays C221-7, circuit 777 (Y), and transfer case assembly C201-15, circuit 777 (Y).
  • Page 29 1998 Expedition/Navigator Workshop Manual Page 29 of 64 Is the resistance less than 5 ohms? REPLACE the transfer case shift relays. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 57 (BK). CLEAR the DTCs. TEST the system for normal operation. B34 CHECK THE CONTACT PLATE SWITCHES —...
  • Page 30 1998 Expedition/Navigator Workshop Manual Page 30 of 64 GO to B37. GO to B36. B36 CHECK CIRCUIT 771 (P/Y) TO THE CONTACT PLATE SWITCH A Connect a jumper wire between transfer case assembly C201-10, circuit 762 (Y/W) and C201-5 circuit 771 (P/Y). Monitor the PID PLATE_A.
  • Page 31 1998 Expedition/Navigator Workshop Manual Page 31 of 64 REPAIR circuit 771 (P/Y). CLEAR the DTCs. TEST the system for normal operation. B39 CHECK CIRCUIT 771 (P/Y) FOR SHORT TO POWER GEM C241 Measure the voltage between transfer case assembly C201-5, circuit 771 (P/Y), and ground. Is any voltage indicated? REPAIR circuit 771 (P/Y).
  • Page 32 1998 Expedition/Navigator Workshop Manual Page 32 of 64 Is the resistance less than 5 ohms? REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 762 (Y/W). CLEAR the DTCs. CYCLE the ignition switch to OFF, then ON. TEST the system for normal operation.
  • Page 33 1998 Expedition/Navigator Workshop Manual Page 33 of 64 Is the resistance greater than 10,000 ohms? REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 770 (W). CLEAR the DTCs. CYCLE the ignition switch to OFF, then ON. TEST the system for normal operation.
  • Page 34 1998 Expedition/Navigator Workshop Manual Page 34 of 64 Does the PID PLATE_C not indicate OPEN? GO to B49. GO to B48. B48 CHECK CIRCUIT 764 (BR/W) TO THE CONTACT PLATE SWITCH C Connect a jumper wire between transfer case assembly C201-10, circuit 762 (Y/W), and C201-9, circuit 764 (BR/W).
  • Page 35 1998 Expedition/Navigator Workshop Manual Page 35 of 64 Is the resistance less than 5 ohms? GO to B51. REPAIR circuit 764 (BR/W). CLEAR the DTCs. TEST the system for normal operation. B51 CHECK CIRCUIT 764 (BR/W) FOR SHORT TO POWER GEM C241 Measure the voltage between transfer case assembly C201-9, circuit 764 (BR/W), and ground.
  • Page 36 1998 Expedition/Navigator Workshop Manual Page 36 of 64 Does the PID PLATE_D indicate CLOSED? RECONNECT the transfer case assembly and GEM C241. GO to GO to B55. B54 CHECK CIRCUIT 763 (O/W) FOR SHORT TO GROUND GEM C241 Measure the resistance between transfer case assembly C201-13, circuit 763 (O/W), and ground. Is the resistance greater than 10,000 ohms? REPLACE the GEM;...
  • Page 37 1998 Expedition/Navigator Workshop Manual Page 37 of 64 Is any voltage indicated? REPAIR circuit 763 (O/W). CLEAR the DTCs. CYCLE the ignition to OFF, then ON. TEST the system for normal operation. REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. CYCLE the ignition to OFF, then ON. TEST the system for normal operation.
  • Page 38 1998 Expedition/Navigator Workshop Manual Page 38 of 64 Monitor the PID IGN_GEM while turning the ignition switch through the START, RUN, OFF, and ACC positions. Do the PID values agree with the ignition switch positions? GO to C2. REPAIR the ignition circuit (RUN/ACC: circuit 297 [BK/LG], RUN: circuit 687 [GY/Y], START: circuit 32 [R/LB] or circuit 481 [GY/Y]) in question.
  • Page 39 1998 Expedition/Navigator Workshop Manual Page 39 of 64 If DTC P1869, REFER to Section 413-01. If DTC P1874, GO to Pinpoint Test If DTC P1876, GO to Pinpoint Test If DTC P1877, GO to Pinpoint Test If DTC P1891, GO to If DTC C1107, GO to Pinpoint Test GO to C3.
  • Page 40 1998 Expedition/Navigator Workshop Manual Page 40 of 64 Measure the resistance between mode switch terminals 2 and 3 while rotating the mode switch through all positions; refer to the following chart: Switch Position Resistance Range 3705-4095 ohms A4WD 1425-1575 ohms 646-714 ohms 228-252 ohms Are the resistances within specifications?
  • Page 41 1998 Expedition/Navigator Workshop Manual Page 41 of 64 Measure the voltage between GEM C241-8, circuit 780 (DB), and ground. Is any voltage indicated? REPAIR circuit 780 (DB). CLEAR the DTCs. TEST the system for normal operation. GO to C10. C10 CHECK CIRCUIT 682 (DB) FOR OPEN GEM C239 Measure the resistance between mode switch C230-2, circuit 682 (DB), and GEM C239-21, circuit 682 (DB).
  • Page 42 1998 Expedition/Navigator Workshop Manual Page 42 of 64 Monitor the PID BOO_GEM. Depress the brake pedal. Does the PID BOO_GEM indicate ON? GO to C15. GO to C13. C13 CHECK THE VOLTAGE TO THE BPP SWITCH BPP Switch C252 Measure the voltage between BPP switch C252, circuit 10 (LG/R), and ground. Is the voltage greater than 10 volts? GO to C14.
  • Page 43 1998 Expedition/Navigator Workshop Manual Page 43 of 64 REPLACE the BPP switch; REFER to Section 417-01. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 511 (LG). If the concern is not found with the circuit, then REPLACE the GEM; REFER to Section 419-10.
  • Page 44 1998 Expedition/Navigator Workshop Manual Page 44 of 64 REPAIR circuit 463 (R/W). CLEAR the DTCs. TEST the system for normal operation. C18 CHECK THE DTR SENSOR Monitor the PID NTRL_SW. Verify that the PID NTRL_SW indicates NOT NTRL. Connect a jumper wire between DTR sensor C182-7, circuit 57 (BK), and C182-8, circuit 463 (R/W). Does the PID NTRL_SW indicate NTRL? REPLACE the DTR sensor (4.6L refer to Section...
  • Page 45 1998 Expedition/Navigator Workshop Manual Page 45 of 64 REPAIR circuit 676 (PK/O). CLEAR the DTCs. TEST the system for normal operation. C21 CHECK CIRCUIT 679 (GY/BK) FOR OPEN Fuse Junction Panel C243 Measure the resistance between VSS C186, circuit 679 (GY/BK), and fuse junction panel C243-21, circuit 679 (GY/BK).
  • Page 46 1998 Expedition/Navigator Workshop Manual Page 46 of 64 Monitor the PIDs PLATE_A, PLATE_B, PLATE_C, and PLATE_D. Place the mode switch in the 4H position and record the PIDs. Depress the brake pedal. Place the mode switch in the 4L position and record the PIDs. Compare the PIDs with Table 4 —...
  • Page 47 1998 Expedition/Navigator Workshop Manual Page 47 of 64 Does the PID PLATE_A not indicate OPEN? GO to C27. GO to C26. C26 CHECK CIRCUIT 771 (P/Y) TO THE CONTACT PLATE SWITCH A Connect a jumper wire between transfer case assembly C201-10, circuit 762 (Y/W), and C201-5, circuit 771 (P/Y).
  • Page 48 1998 Expedition/Navigator Workshop Manual Page 48 of 64 Is the resistance less than 5 ohms? GO to C29. REPAIR circuit 771 (P/Y). CLEAR the DTCs. TEST the system for normal operation. C29 CHECK CIRCUIT 771 (P/Y) FOR SHORT TO POWER GEM C241 Measure the voltage between transfer case assembly C201-5, circuit 771 (P/Y), and ground.
  • Page 49 1998 Expedition/Navigator Workshop Manual Page 49 of 64 762 (Y/W). Is the resistance less than 5 ohms? REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 762 (Y/W). CLEAR the DTCs. CYCLE the ignition to OFF, then ON. TEST the system for normal operation.
  • Page 50 1998 Expedition/Navigator Workshop Manual Page 50 of 64 Is the resistance greater than 10,000 ohms? REPLACE the GEM; REFER to Section 419-10. CLEAR the DTCs. TEST the system for normal operation. REPAIR circuit 770 (W). CLEAR the DTCs. CYCLE the ignition to OFF, then ON. TEST the system for normal operation.
  • Page 51 1998 Expedition/Navigator Workshop Manual Page 51 of 64 Does the PID PLATE_C not indicate OPEN? GO to C39. GO to C38. C38 CHECK CIRCUIT 764 (BR/W) TO THE CONTACT PLATE SWITCH C Connect a jumper wire between transfer case assembly C201-9, circuit 764 (BR/W), and C201-10, circuit 762 (Y/W).
  • Page 52 1998 Expedition/Navigator Workshop Manual Page 52 of 64 Is the resistance less than 5 ohms? GO to C41. REPAIR circuit 764 (BR/W). CLEAR the DTCs. TEST the system for normal operation. C41 CHECK CIRCUIT 764 (BR/W) FOR SHORT TO POWER Measure the voltage between transfer case assembly C201-9, circuit 764 (BR/W), and ground.
  • Page 53 1998 Expedition/Navigator Workshop Manual Page 53 of 64 C44 CHECK CIRCUIT 763 (O/W) FOR SHORT TO GROUND GEM C241 Measure the resistance between transfer case assembly C201-13, circuit 763 (O/W), and ground. Is the resistance greater than 10,000 ohms? REPLACE the GEM; REFER to Section 419-10.
  • Page 54 1998 Expedition/Navigator Workshop Manual Page 54 of 64 Clear the DTCs Remove the transfer case electric shift motor from the transfer case; refer to Section 308-07B. Monitor the PIDS PLATE_A, PLATE_B, PLATE_C and PLATE_D. Depress the brake pedal. Place the mode switch in the 4L position and compare the PIDS to Table 4 — Contact Plate Sensor Position Codes in this section.
  • Page 55 1998 Expedition/Navigator Workshop Manual Page 55 of 64 Monitor the PID IGN_GEM while turning the ignition switch through the START, RUN, OFF, and ACC positions. Do the PID values agree with the ignition switch position? GO to D2. REPAIR the ignition circuit (RUN/ACC: circuit 297 [BK/LG], RUN: circuit 687 [GY/Y], or START: circuit 32 [R/LB]) in question.
  • Page 56 1998 Expedition/Navigator Workshop Manual Page 56 of 64 If DTC P1876, GO to If DTC P1877, GO to If DTC P1891, GO to Pinpoint Test B Pinpoint Test If DTC C1107, GO to Pinpoint Test GO to D3. D3 CHECK THE 4H INDICATOR NOTE: The active command 4WD MODE L is located in the 4WD Mode Indicators active command menu.
  • Page 57 1998 Expedition/Navigator Workshop Manual Page 57 of 64 The front and rear driveshaft should both spin. Is the transfer case locking the front driveshaft to the rear driveshaft? GO to D8. GO to Pinpoint Test D8 CHECK THE FRONT DRIVESHAFT DISENGAGEMENT Place the mode switch in the 2H position.
  • Page 58 1998 Expedition/Navigator Workshop Manual Page 58 of 64 Does the PID 4WDSOL indicate OFF--- and 2WDSOL indicate ON---? GO to D20. If the PID 2WDSOL indicates ON-B-, GO to . If the PID 4WDSOL indicates OFFO-G, GO to D12 CHECK CIRCUITS 145 (GY/BK) AND 605 (R) FOR SHORT TO POWER 4WD Vacuum Solenoid C180 2WD Vacuum Solenoid C181 GEM C241...
  • Page 59 1998 Expedition/Navigator Workshop Manual Page 59 of 64 4WD Vacuum Solenoid C180 2WD Vacuum Solenoid C181 Measure the voltage between 4WD vacuum solenoid C180, circuit 294 (W/LB), and ground; and between 2WD vacuum solenoid C181, circuit 294 (W/LB), and ground. Are the voltages greater than 10 volts? GO to D15.
  • Page 60 1998 Expedition/Navigator Workshop Manual Page 60 of 64 Is the resistance less than 5 ohms? GO to D17. REPAIR circuit 145 (GY/BK). CLEAR the DTCs. TEST the system for normal operation. D17 CHECK CIRCUIT 605 (R) FOR OPEN Measure the resistance between GEM C241-7, circuit 605 (R), and 4WD vacuum solenoid C180, circuit 605 (R). Is the resistance less than 5 ohms? GO to D18.
  • Page 61 1998 Expedition/Navigator Workshop Manual Page 61 of 64 REPAIR the vacuum feed line in question. CLEAR the DTCs. TEST the system for normal operation. D21 CHECK THE 4WD AND 2WD VACUUM SOLENOIDS — CLOSED CONDITION Disconnect the 4WD and 2WD vacuum solenoid vacuum lines. Connect a vacuum pump to the feed line of the vacuum solenoid being tested.
  • Page 62 1998 Expedition/Navigator Workshop Manual Page 62 of 64 REPAIR the vacuum motor. CLEAR the DTCs. TEST the system for normal operation. D25 CHECK THE VACUUM MOTOR — AXLE ENGG OFF AND AXLE DSCN ON NOTE: The active commands AXLE ENGG and AXLE DSCN are located in the 4-Wheel Electronic Shift active command menu.
  • Page 63 1998 Expedition/Navigator Workshop Manual Page 63 of 64 Fuse Junction Panel C243 Measure the voltage between fused junction panel terminal 4 and ground, and between fused junction panel terminal 16, and ground. Are the voltages greater than 10 volts? GO to E4. REPLACE the fuse junction panel.
  • Page 64 1998 Expedition/Navigator Workshop Manual Page 64 of 64 http://www.fordtechservice.dealerconnection.com/pubs/content/~WSWJ/~MUS~LEN/21/... 8/30/2010...

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