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Symptom Chart

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart - Electronic Shift

Condition Possible Sources Action
  • No communication with the 4X4 control module
  • Diagnostic tool
  • Data link connector (DLC)
  • 4X4 control module
  • Circuitry
  • The instrument cluster (IC) 4x4 and Low Range indicators do not operate correctly/do not operate
  • IC
  • Circuitry
  • 4X4 control module
  • The vehicle does not shift between 2H and 4H modes correctly
  • Mode select switch (MSS)
  • Transfer case
  • Transfer case clutch
  • Pulse vacuum hublocks (PVH)
  • 4X4 control module
  • Circuitry
  • The vehicle does not shift between 4H and 4L modes correctly
  • Transfer case
  • Mode select switch
  • 4X4 control module
  • Transmission drag
  • 4WD does not engage at speed correctly
  • Transfer case synchronizer
  • 4X4 control module
  • Pulse vacuum hublocks (PVH)
  • The front axle does not engage/disengage correctly
  • Pulse vacuum hublocks (PVH)
  • PVH solenoid assembly
  • Circuitry
  • Vacuum leaks
  • 4X4 control module
  • Front axle assembly
  • The 4WD system jumps out of gear
  • Transfer case
  • PVH system
  • Mode select switch
  • Straightline driveline wind-up
  • Tire inflation pressure
  • Tire and wheel size
  • Tire wear
  • Axle ratio
  • Clunking noise during 4WD engagement, especially at high speeds
  • Vehicle speed
  • Torque to the front axle
  • The transfer case makes noise
  • Tire inflation pressure
  • Tire and wheel size
  • MAKE SURE that all tires and wheels are the same size and that the inflation pressures are correct.
 
  • Tire tread wear
  • CHECK tire tread wear to see if there is more than 0.15 mm (0.06 in) difference in tread wear between front and rear. INTERCHANGE one front wheel and one rear wheel. ROAD TEST again.
 
  • Internal components
  • OPERATE the vehicle in all transmission gears. If there is noise in the transmission in NEUTRAL, or in some gears and not in others, REMOVE and REPAIR the transmission. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - TORQSHIFT article. If there is noise in all gears, DISASSEMBLE the transfer case. REFER to TRANSFER CASE article. CHECK the planetary gears, the bearings, the upper and lower drive sprockets and drive chain for damage. INSTALL new parts as necessary.
 
  • Fluid level
  • FILL with automatic transmission fluid. REFER to TRANSFER CASE article.
  • Unable to duplicate customer concern
  • 4WD system and/or related components
  • Carry out the Electronic Shift on the Fly (ESOF) Functional Test. Go to Pinpoint Test P .
Fig 1: 4X4 Control Module C281a
GF0007419Courtesy of FORD MOTOR CO.
Item Description
1 4X4 control module power circuit 1306 (PK/WH)
Main power connection to the 4X4 control module, shared with pin No. 2. Hot at all times, 9 volts or greater between 4X4 control module and ground. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected.
2 4X4 control module power circuit 1306 (PK/WH)
Main power connection to the 4X4 control module, shared with pin No. 1. Hot at all times, 9 volts or greater between 4X4 control module and ground. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected.
3 4X4 control module ground circuit 57 (BK)
Main ground connection to the 4X4 control module. 1 volt or less between the 4X4 control module and ground. 5 ohms or less between the 4X4 control module and ground with the 4X4 control module disconnected.
4 Brake on/off input (BOO) circuit 810 (RD/LG)
Circuit required for shifting to low range (4L). 9 volts or greater when brake pedal is depressed. <1 volt when brake is not applied. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and brake ON/OFF (BOO) switch.
5 Ignition RUN/START circuit 640 (RD/YE)
Hot when in RUN/START. 9 volts or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected.
6 Ignition RUN/ACC circuit 1002 (BK/PK)
Hot when in RUN/ACC. 9 volts or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected.
7 Transfer case shift motor encoder power circuit 976 (OG)
Provides power to shift motor encoder from 4X4 control module. 9 volts or greater between the 4X4 control module and ground with the 4X4 control module connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and shift motor encoder.
8 Transfer case shift motor encoder return (ground) circuit 3659 (BK/PK)
4X4 control module-provided main ground return path to the shift motor encoder. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case encoder disconnected. 5 ohms or less between the 4X4 control module and ground with the 4X4 control module and transfer case encoder connected. 5 ohms or less between the 4X4 control module and the transfer case encoder.
9 Transfer case shift motor encoder signal position A 771 (VT/YE)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case and ground when in 2H with the 4X4 control module and the transfer case encoder connected. 9 volts or greater between the transfer case and ground when in 4H or 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
10 Transfer case shift motor encoder signal position B 764 (BN/WH)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case and ground when in 2H with the 4X4 control module and the transfer case encoder connected. 9 volts or greater between the transfer case and ground when in 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
11 Transfer case shift motor encoder signal position C 770 (WH)
One of 4 channels which provide transfer case shift motor position. 9 volts or greater between transfer case and ground when in 2H with the 4X4 control module and the transfer case encoder connected. 0 volts between the transfer case and ground when in 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
12 Transfer case shift motor encoder signal position D 763 (OG/WH)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case and ground when in 2H, 4H or 4L with the 4X4 control module and the transfer case encoder connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
Fig 2: 4X4 Control Module C281b
GF0007420Courtesy of FORD MOTOR CO.
Item Description
1 Pulse vacuum hublock (PVH) LOCK solenoid control circuit 145 (GY/BK)
4X4 control module-provided ground path for LOCK coil in PVH solenoid when vehicle is placed from 2H to 4H/4L. Ground path provided for approximately 45 seconds after a 2H to 4H/4L shift is required by the driver. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and PVH solenoid disconnected. 5 ohms or less between the 4X4 control module and the PVH LOCK Solenoid.
2 4WD mode select switch (MSS) power circuit 780 (DB)
Hot in run, 9 volts or greater between 4X4 control module and ground with 4X4 control module C281b connected and MSS C284 disconnected. Approximately 7.5V between the 4X4 control module and ground with the 4X4 control module connected and MSS in 2H. Approximately 5.5 volts between the 4X4 control module and ground with the 4X4 control module connected and MSS in 4H. Approximately 3.7 volts between the 4X4 control module and ground with the 4X4 control module and MSS connected and MSS in 4L. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and MSS disconnected. 5 ohms or less between the 4X4 control module and MSS.
3 Vehicle speed signal (VSS) from ABS module 679 (GY/BK)
Circuit required for shifting to low range (4L). Speed-dependent square wave input. Approximately 0 volts between 4X4 control module and ground at 0 kph. Voltage increases as vehicle speed increases. VSS must be 5kph or less for shifts to low range (4L). 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and ABS module disconnected. 5 ohms or less between the 4X4 control module and the ABS module.
4 Transmission neutral signal (or clutch apply signal) 463 (RD/WH) from PCM
Circuit required for shifting to low range (4L). 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected and transmission NOT in NEUTRAL (or clutch pedal NOT applied). 5 ohms or less between the 4X4 control module and ground with the 4X4 control module disconnected and transmission in NEUTRAL (or clutch pedal applied). 5 ohms or less between the 4X4 control module and the PCM.
5 Transfer case shift motor clockwise rotation (CW) relay control circuit 782 (BN/WH)
Circuit provides the module-switched ground path for the clockwise rotation relay. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and ground when the 4X4 control module is connected and the transfer case is shifted from 2H to 4H to 4L. 5 ohms or less between the 4X4 control module and clockwise rotation relay.
6 Transfer case shift motor counterclockwise rotation relay control circuit 781 (OG/LB)
Circuit provides the module-switched ground path for the counterclockwise rotation relay. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and ground when the 4X4 control module is connected and the transfer case is shifted from 4L to 4H to 2H. 5 ohms or less between the 4X4 control module and counterclockwise rotation relay.
7 Pulse vacuum hublock (PVH) LOCK/UNLOCK solenoid control circuit 605 (RD)
Circuit provides the module-switch ground path for the LOCK/UNLOCK coil in the PVH solenoid when vehicle is placed from 2H to 4H/4L to 2H. Ground path provided for approximately 45 seconds after a 2H to 4H/4L shift is requested by the drive. Ground path is provided for approximately 15 seconds after a 4H/4L to 2H shift is requested. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the PVH solenoid disconnected. 5 ohms or less between the 4X4 control module and the PVH Solenoid.
8 Not Used
9 4WD mode select switch (MSS) signal return circuit 465 (WH/LB)
4X4 control module-provided ground return path for MSS signal. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and MSS disconnected. 5 ohms or less between the 4X4 control module and ground with the 4X4 control module and MSS connected. 5 ohms or less between the 4X4 control module and MSS.
10 Diagnostic data link connector circuit 70 (LB/WH)
10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected and the NGS/WDS unplugged from the DLC. 5 ohms or less between the 4X4 control module and the DLC.
11 Instrument cluster (IC) Low Range (4L) lamp control circuit 975 (BN/YE)
4X4 control module-provided ground path for "LOW RANGE" lamp in IC when transfer case is shifted to 4L. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and ground when transfer case is placed in 4L with the 4X4 control module and IC connected. 5 ohms or less between the 4X4 control module and the IC.
12 IC 4x4 (4H) lamp control circuit 210 (LB)
Module-provided ground path for "4x4" lamp in IC when transfer case is shifted to 4H OR 4L. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and ground when transfer case is placed in 4H OR 4L with the 4X4 control module and IC connected. 5 ohms or less between the 4X4 control module and the IC.
Fig 3: Mode Select Switch (MSS) C284
GF0007421Courtesy of FORD MOTOR CO.
Item Description
1 Nighttime illumination ground circuit 57 (BK)
2 4WD Mode select switch (MSS) signal return circuit 465 (WH/LB)
Provides ground return path for MSS signal. 10,000 ohms or greater between the 4X4 control module and ground with the MSS disconnected and the 4X4 control module connected. 5 ohms or less between the 4X4 control module and MSS.
3 4WD Mode select switch (MSS) signal circuit 780 (DB)
Hot in RUN. 9 volts or greater between the MSS and ground with the MSS disconnected. Approx 7.5V between the MSS and ground with the MSS connected and in 2H. Approximately 5.5 volts between the MSS and ground with the MSS connected and in 4H. Approx 3.7 volts between the MSS and ground with the MSS connected and in 4L. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and MSS disconnected. 5 ohms or less between the 4X4 control module and MSS.
4 Nighttime illumination power circuit 19 (LB/RD)
Fig 4: Transfer Case Encoder C350a
GF0007422Courtesy of FORD MOTOR CO.
Item Description
1 Transfer case encoder signal position D 763 (OG/WH)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case and ground when in 2H, 4H or 4L with the 4X4 control module and the transfer case encoder connected. 10,000 ohms or greater between the transfer case encoder and ground with the 4X4 control module and the transfer case encoder disconnected. 5 ohms or less between the 4X4 control module and the transfer case encoder.
2 Transfer case encoder power supply circuit 976 (OG)
Hot at all times. 9 volts or greater between the transfer case encoder and ground with the transfer case encoder disconnected. 10,000 ohms or greater between the transfer case and ground with the transfer case encoder and the 4X4 control module disconnected. 5 ohms or less between the 4X4 control module and transfer case encoder.
3 Transfer case encoder signal position B 764 (BN/WH)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case and ground when in 2H or 4H with the 4X4 control module and the transfer case encoder connected. 9 volts or greater between the transfer case encoder and ground when in 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
4 Transfer case encoder signal return 3659 (BK/PK)
10,000 ohms or greater between the 4X4 control module and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
5 Transfer case encoder signal position A 771 (VT/YE)
One of 4 channels which provide transfer case shift motor position. 0 volts between transfer case encoder and ground when in 2H with the 4X4 control module and the transfer case encoder connected. 9 volts or greater between the transfer case and ground when in 4H or 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the transfer case encoder and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
6 Transfer case encoder signal position C 770 (WH)
One of 4 channels which provide transfer case shift motor position. 9 volts or greater between transfer case and ground when in 2H or 4H with the 4X4 control module and the transfer case encoder connected. 0 volts between the transfer case and ground when in 4L with the 4X4 control module and transfer case encoder connected. 10,000 ohms or greater between the transfer case encoder and ground with the 4X4 control module and the transfer case disconnected. 5 ohms or less between the 4X4 control module and the transfer case.
Fig 5: Transfer Case Shift Motor C350b
GF0007423Courtesy of FORD MOTOR CO.
Item Description
1 Transfer case counterclockwise rotation power supply circuit 778 (OG)
9 volts or greater between the shift motor and ground when a counterclockwise range shift is performed. 10,000 ohms or greater between the counterclockwise rotation relay and ground with the counterclockwise relay and transfer case disconnected. 5 ohms or less between the shift motor and the counterclockwise relay when a clockwise range shift is performed. 5 ohms or less between the counterclockwise relay and the transfer case. 0.1 - 20 ohms between shift motor pin No. 1 and No. 2.
2 Transfer case shift motor clockwise rotation power supply circuit 777 (YE)
9 volts or greater between the shift motor and ground when a clockwise range shift is performed. 10,000 ohms or greater between the clockwise rotation relay and ground with the clockwise relay and transfer case disconnected. 5 ohms or less between the shift motor and the clockwise relay when a counterclockwise range shift is performed. 5 ohms or less between the clockwise relay and the transfer case. 0.1 - 20 ohms between shift motor pin No. 1 and No. 2.
Fig 6: Pulse Vacuum Hublock (PVH) Solenoid C1247
GF0007424Courtesy of FORD MOTOR CO.
Item Description
1 PVH LOCK solenoid control circuit 145 (GY/BK)
4X4 control module-controlled ground path to the LOCK solenoid. Ground path is enabled for approximately 45 seconds after a mode switch change is made from 2H to 4H/4L. 10,000 ohms or greater between the PVH solenoid and ground with the PVH solenoid and the 4X4 control module disconnected. 5 ohms or less between the PVH solenoid and the 4X4 control module.
2 PVH solenoid power supply circuit 295 (LB/PK)
Hot when in RUN. 9 volts or greater between the PVH solenoid and ground. 10,000 ohms or greater between the PVH solenoid and ground with the PVH solenoid disconnected. 10,000 ohms or greater between the PVH solenoid and ground with the PVH solenoid and the 4X4 control module disconnected.
3 PVH LOCK/UNLOCK solenoid control circuit 605 (RD)
Provides a module-controlled ground path to the LOCK/UNLOCK solenoid. Ground path is enabled for approximately 15 seconds after a mode switch change is made from 4L/4H to 2H. Ground path is enabled for approximately 45 seconds after a mode switch change is made from 2H to 4H/4L. 10,000 ohms or greater between the PVH solenoid and ground with the PVH solenoid and the 4X4 control module disconnected. 5 ohms or less between the PVH solenoid and the 4X4 control module.
Fig 7: Shift Motor Clockwise Rotation Relay (Low-to-High) C1129
GF0007425Courtesy of FORD MOTOR CO.
Item Description
85 Transfer case shift motor clockwise rotation relay control circuit 782 (BN/WH)
4X4 control module-controlled ground path to the clockwise shift relay. This ground path is only provided during a range shift attempt. 10,000 ohms or greater between the clockwise relay and ground with the CW relay and the 4X4 control module disconnected. 5 ohms or less between the clockwise relay and the 4X4 control module.
86 Transfer case shift motor clockwise rotation relay power supply circuit 704 (DG/LG)
Provides power to the clockwise rotation relay. Hot at all times. 9 volts or greater between the clockwise relay and ground. 10,000 ohms or greater between the clockwise relay and ground with the clockwise relay disconnected.
87 Transfer case shift motor clockwise rotation relay coil power supply circuit 704 (DG/LG)
Provides power to the clockwise shift relay coil. Hot at all times. 9 volts or greater between the clockwise relay and ground. 10,000 ohms or greater between the clockwise rotation relay and ground with the clockwise relay disconnected.
87A Transfer case shift motor clockwise rotation relay ground input circuit 57 (BK)
Provides permanent chassis ground return path for shift motor during a counterclockwise shift. 5 ohms or less between clockwise relay and ground at all times.
30 Transfer case shift motor clockwise rotation relay power/ground output circuit 777 (YE)
Provides power to the shift motor during clockwise motor movement. Provides ground to shift motor during counterclockwise motor movement. 9 volts or greater between the clockwise relay and ground during a range shift attempt. 5 ohms or less between the clockwise relay and ground with the clockwise relay disconnected. 5 ohms or less between the clockwise relay and the transfer case.
Fig 8: Shift Motor Counterclockwise Rotation Relay (High-to-Low) C1173
GF0007426Courtesy of FORD MOTOR CO.
Item Description
85 Transfer case shift motor counterclockwise rotation relay control circuit 781 (OG/LB)
Provides a module-controlled ground path to the counterclockwise shift relay. This ground path is only provided during a range shift attempt. 10,000 ohms or greater between the counterclockwise relay and ground with the counterclockwise relay and the 4X4 control module disconnected. 5 ohms or less between the counterclockwise relay and the 4X4 control module.
86 Transfer case shift motor counterclockwise rotation relay power supply circuit 704 (DG/LG)
Provides power to the counterclockwise rotation relay. Hot at all times. 9 volts or greater between the counterclockwise relay and ground. 10,000 ohms or greater between the clockwise relay and ground with the clockwise relay disconnected.
87 Transfer case shift motor counterclockwise rotation relay coil power supply circuit 704 (DG/LG)
Provides power to the counterclockwise shift relay coil. Hot at all times. 9 volts or greater between the counterclockwise relay and ground. 10,000 ohms or greater between the counterclockwise rotation relay and ground with the counterclockwise relay disconnected.
87A Transfer case shift motor counterclockwise rotation relay ground input circuit 57 (BK)
Provides permanent chassis ground return path for shift motor during a clockwise shift. 5 ohms or less between counterclockwise relay and ground at all times.
30 Transfer case shift motor counterclockwise rotation relay power/ground output circuit 778 (OG)
Provides power to the shift motor during counterclockwise motor movement. Provides ground to shift motor during clockwise motor movement. 9 volts or greater between the counterclockwise relay and ground during a range shift attempt. 10,000 ohms or greater between the counterclockwise relay and ground with the counterclockwise relay disconnected. 5 ohms or less between the counterclockwise relay and the transfer case.
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