Question about 1992 Ford Bronco

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Transfer case motor

I removed the transfer case motor, but accidentally ripped out the brown wire. I believe its to the speed sensor. Do I have to take the whole transfer case apart to get to the brown wire, so I can put on a new transfer case motor? I tempted to just leave it in 4 high and if I need to use 4x4 I'll climb under the car and manually shift it!

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The brown wire is for the electromagnet inside the transfer case to engage the clutch if the wire is broken right at the case the magnet will need to be replaced

Posted on Jul 14, 2009

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I got a 2000 Oldsmobile Bravda and has smart track that works when it wants to the service light comes on once and awhile. When I really need 4wd it doesn't kick in Help


There are three different transfer case's ! Which of these does your olds have ?

Transfer Case - NVG 136-NP4 (One Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
Transfer Case - NVG 236 (Two Speed Automatic)

All three have an electronic control module ! When the light is on DTC'S are stored in the transfer case shift control module .

SERVICE indicator (AWD/4WD) lamp
The SERVICE indicator (AWD/4WD) lamp is an integral part of the instrument cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (AWD/4WD) lamp is controlled by the transfer case shift control module via a Class 2 serial data message.

There are three speed sensors on the Automatic Transfer Case (ATC), two on the rear output shaft and one on the front output shaft. Each speed sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases.
Vehicle Speed Sensor
One of the two speed sensors on the rear output shaft is the vehicle speed sensor (VSS). It is an input to the vehicle control module (VCM). The VCM sends this information to the transfer case shift control module via the Class 2 Serial Data bus.
Rear Propshaft Speed Sensor
The transfer case shift control module converts the pulsating AC voltage from the rear propshaft speed sensor to a Rear Propshaft Speed in RPMs to be used for calculations. The Rear Propshaft Speed can be displayed with a scan tool.
Front Propshaft Speed Sensor
The transfer case shift control module converts the pulsating AC voltage from the front propshaft speed sensor to Front Propshaft Speed in RPM to be used for calculations, and to monitor the difference between the front and rear propshaft sensor speed. It is also used in the AUTO 4WD mode of operation to determine the amount of slip and the percent of torque to apply to the front axle. The Front Propshaft Speed can be displayed with a scan tool.

Transfer Case Encoder Motor
The transfer case encoder motor is a permanent magnet D.C. motor and gear reduction assembly. The encoder motor is controlled with a Pulse Width Modulated (PWM) signal provided by the transfer case shift control module. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case to shift the transfer case. This circuit consists of a power supply relay (Motor Feed A circuit ) that supplies voltage to the motor. The Motor Control B circuit is a PWM driver that varies the duty cycle to control the amount of current through the motor to ground.

There are a number of codes that can set .
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

You don't want to just start replacing parts , that could cost $$$$$$ . You could check connections at all the sensors an the control module , but other then that ,well . Your best bet , take it to a qualified repair shop .

Feb 19, 2017 | 2000 Oldsmobile Bravada

1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

1 Answer

02 ford explorer. 6cyl 4.0 litre. 4x4. was stuck in 4wd , narrowed it down to shaft motor, financially strapped so called junk yard after findin new price of these and located one. Put motor in and every...


The brown wire goes to the clutch in the transfer case that engages the front drive shaft. If you cut it you need to hook it up to the harness that comes down out of the truck. It doesn't have to go thru the connector but it has to be hooked up for the 4 wheel drive to work.

Mar 04, 2011 | 1998 Ford Windstar

1 Answer

Where is the transfer case shift motor located on 2004 dodge dakota


The transmission control module and the transfer case control module are separate parts. The transmission control module is mounted under the hood and controls only transmission functions. The transfer case control module controls only the transfer case, and is located inside the truck. If you remove the trim panel under the steering column you will find the transfer case control module mounted just to the right of the opening.


The shift motor is located just behind the axle tube to prevent damage.
There is a shift motor on the right front axle that is vacuum operated.
The shift motor (1) is an electromechanical device consisting of a DC permanent magnet motor, a motor brake, a gear train and an analog position sensor. The shift motors' overall function is to move and lock a gear that moves the mode fork found in the transfer case. This allows the transfer case to be shifted electrically to multiple operating positions (4LOCK and AWD). The operating current of the shift motor under
stall conditions is 30 amps maximum at 72° F with 13.5 volts, at the motor leads.
OPERATION
Shifting in the transfer case occurs when the shift motor brake is released and a Pulse Width Modulated (PWM) voltage is supplied to the shift motor by the Front Control Module (FCM). A linear analog position sensor located inside the shift motor, provides the FCM with the motors' angular, rotational position. With this information, the FCM
continuously knows the motors' position, and therefore allows it to accurately control the motors' operation, including voltage polarity which is used to control motor direction.

REMOVAL :---Note: New shift motor assemblies are shipped in the AWD position. If a new shift motor assembly must be installed, it will be necessary to shift the transfer case to the AWD position prior to motor installation.
Raise the vehicle on a suitable hoist.Remove the front propeller shaft. Disengage the wiring connectors from the shift motor and mode sensor.Remove the front output shaft companion flange from the transfer case.Remove the bolts (Remove the Shift Motor and Mode Sensor Assembly Bolts) holding the shift motor and mode sensor assembly onto the transfer case.Separate the shift motor and mode sensor assembly from the transfer case. See fig below:-- helpmech_19.gif
1 - TRANSFER CASE.2 - SHIFT MOTOR AND MODE SENSOR ASSEMBLY.3 - BOLT.-- This should help.Thanks.Helpmech.

Feb 26, 2011 | 2004 Dodge Dakota

1 Answer

Transfer case grinds truck only runs in 4wheel low nothing in 4wheel high or 2wheel drive


Manual or electronic t case?

Section 07-07: Transfer Case, 4x4 System, Service 1994 Bronco/Econoline/F-Series Workshop Manual
DESCRIPTION AND OPERATION Electronic Shift Operation The transfer case is equipped with a magnetic clutch, similar to an air conditioning compressor clutch, which is located inside the transfer case adjacent to the lockup collar. The clutch is used to spin up the front drive system from zero to vehicle speed in milliseconds. This spin-up allows the shift between 2-high and 4-high to be made at vehicle speeds listed in the vehicle owner's guide. The spin up engages the front lock hubs. When the transfer case rear and front output shafts reach synchronous speed, the spring-loaded lockup collar mechanically engages the mainshaft hub to the chain drive sprocket and the magnetic clutch is then deactivated. Shifts between 4-high and 4-low can only occur with the transmission safety switches closed. The vehicle's speed must also be within specified limits as determined by the transfer case speed sensor (3 mph or under). Electronic Shift Control System
This system consists of a two-switch control system, an electronic control module, an electric shift motor (7G360) with an integral shift position sensor, and a speed sensor. Switch Control System
There are two control switches located on the upper right corner of the instrument panel for fingertip shift control. The two switches are mounted horizontally and are identified as "4x4" and "LOW RANGE". Two indicator bar lamps are located in the instrument cluster.

c11148a.gif

When either of the two switches on the instrument panel control are depressed, the first thing that happens is that the electronic control module receives input from the transfer case shift position sensor to verify what position the transfer case is in (2H, 4H or 4L). Next, the electronic control module looks at the speed sensor and the park/neutral position switch or clutch pedal position switch (depending on transmission type). If all conditions are correct to allow the desired shift, the electronic control module will tell the electric shift motor to execute the shift. After the shift has been made and the electric shift motor is off, the control module again looks at the shift position sensor to make sure the proper shift has been accomplished. Finally, the dash indicator light and the pushbutton light on the control panel will be illuminated by a signal from the electronic control module indicating the desired function has been completed.
Electronic Control Module
The electronic control module, located on the passenger side, controls the operation of the transfer case in response to inputs to the pushbutton control by the vehicle operator, the speed sensor, shift position sensor and the park/neutral position switch. Speed Sensor
The speed sensor, mounted on the rear of the transfer case , tells the electronic control module the speed of the vehicle to allow range shifts (in or out of 4L) to occur. Shift Position Sensor
The shift position sensor, an integral part of the electric shift motor , tells the electronic control module the shift position of the transfer case . Electric Shift Motor
The electric shift motor , mounted externally at the rear of the transfer case , drives a rotary helical cam which moves the 2W-4W shift fork and 4H-4L reduction shift fork to the selected vehicle drive position.

Nov 12, 2010 | 1994 Ford F250 Supercab

1 Answer

I cant find the location of the speed sensor for a 1996 Mazda B3000 pick up with auto trans


Look around the auto transmission for wires that lead to the VSS (Vehicle Speed Sensor):


    1. Remove the flywheel to converter attaching nuts. Use a socket and breaker bar on the crankshaft pulley attaching bolt. Rotate the pulley clockwise as viewed from the front to gain access to each of the nuts.
    2. NOTE: On belt driven overhead cam engines, never rotate the pulley in a counterclockwise direction as viewed from the front. Remove the Vehicle Speed Sensor (VSS) clamp retaining bolt . . .
    1. 89687p11.jpg
    1. . . . then pull the VSS sensor from the transfer case (4WD) or extension housing (2WD)
    1. 89687p12.jpg

    1. Remove the speedometer cable and/or vehicle speed sensor from the transfer case (4WD) or extension housing (2WD).
    2. On 2WD vehicles, scribe a mark indexing the driveshaft to the rear axle flange. Remove the driveshaft.
    1. On 4WD vehicles, remove the transfer case.
    1. Fig. 3: Speedometer cable connection
    2. 85557046.gif
  • Jul 05, 2010 | 1996 Mazda Pickup

    1 Answer

    Four wheel drive want engage


    The most common problem with those systems is the electric transfer case 4x4 motor mounted on the rear of the transfer case next to the rear drive shaft.They are actually easy to replace.There is a wire that comes out of the transfer and goes into the electric motor for the 4x4 that you need to be carfull of.This wire is a speed sensor wire and will need to be reatatched to the new transfer 4x4 motor so make sure to leave enough to reatatch wire now and in the future.There is no plugin for that wire I don't know why ford built it that way.

    Feb 13, 2010 | 1992 Ford Explorer

    2 Answers

    4wd does not work


    Electronic Shift On the Fly (ESOF) Operation
    The ESOF system is an electronic shift 4x4 system that allows the operator to choose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4WD HIGH mode at speed. To engage or disengage LOW Range, the vehicle speed must be less than 5 kph, the brake depressed, and the transmission must be in NEUTRAL.

    The transfer case is equipped with an electromagnetic clutch which is located inside the case. This clutch is used to spin up the front drive-line when shifting from 2WD to 4x4 High mode at speed. When the control switch on the instrument panel is turned, the generic electronic module (GEM) recognizes that a shift has been requested and activates the electromagnetic clutch and the relays which power the transfer case shift motor. When the shift motor reaches the desired position as determined by the contact plate position inputs to the GEM, power to the shift relays and motors will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the main-shaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

    Shift Between 2WD and 4x4 HIGH:
    Shifts between 2WD and 4x4 HIGH can be made at speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.

    Feature Inputs:
    *4WD Mode Switch (Various resistances).
    *Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).

    Feature Outputs:
    *4x4 Shift Motor Relay Outputs
    *Transfer Case Clutch Relay (grounded when relay is on, open circuit when relay is off).
    *4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
    *Cluster Indicators (ground when activated, open circuit when deactivated).

    Shifting Into/Out of 4WD LOW:
    When shifting into or out of 4WD LOW, the GEM requires that the vehicle speed be less than 5 kph, the brake is applied, and the transmission is in NEUTRAL.

    Feature Inputs:
    *4WD Mode Switch (Various resistances).
    *Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).
    *VSS Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
    Brake Input (battery voltage when brake is depress, open circuit when not activated).
    *Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
    8Start/Clutch Depressed Input

    Feature Outputs:
    *4x4 Shift Motor Relay Outputs
    *4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
    *Cluster Indicators (grounded when activated, open circuit when deactivated).

    4WD Mode Switch
    A rotary switch allows the vehicle operator to choose between 2WD, 4WD HIGH, and 4WD LOW modes of 4x4 operation.

    GEM Module
    The Generic Electronic Module (GEM) controls the operation of the 4x4 system

    Vehicle Speed Sensor
    The vehicle speed sensor (VSS), mounted in the rear of the transfer case, informs the GEM of the vehicle speed.

    Transfer Case Shift Motor Sense Plates

    The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the positions of the transfer case

    Transmission Range Sensor
    Located on the left side of the transmission, this sensor informs the GEM when the transmission is in the NEUTRAL position.

    Electric Shift Motor
    The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary cam which moves the mode fork and range fork within the transfer case to select between the 2WD, 4WD HIGH, and 4WD LOW positions.

    4x4/4x2 Vacuum Solenoids
    These two solenoids are attached to the upper RH side of the engine compartment dash, and alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

    4x4 Shift Motor Relay
    A module containing two relays which under the control of the GEM, shift the transfer case shift motor between the 2WD, 4WD HIGH, and 4WD LOW modes.

    Transfer Case Clutch Relay
    An electromechanical relay is used to activate the transfer case clutch within the transfer case.

    Good luck and hope this helps,but start with the simple and check the fuses and wire harness. Both white/light blue stripe wires should have 12V in run. The GEM will ground the left side (closest to engine) solenoid to disengage the front axle. It will ground the the right side solenoid (closest to fender) to engage the front axle. If the GEM doesn't see Neutral it will not let the truck come out of 4Lo. If the GEM had water leaking on it it may well be the root of the problem. The shift motor only has power when the GEM sends it a signal to move the shift lever. Once the shift is completed the motor shuts off. There are 2 wires that control the shift motor. A yellow and an orange. The GEM alternates between 12v and Ground to these wires to control which way the motor turns. The GEM uses the transfer case shift relay module to control the power to the motor. There are contact plates inside the shift motor assembly that indicate the position that the shift lever is in. This is what the GEM used to know what the T-case is doing. Any one of these components can fail.







    Jan 10, 2010 | 2002 Ford Explorer

    1 Answer

    Auto trans 4x4


    Oh lord, are you in for some work. First of all you will need a transmission jack, a must and a couple of strong guys if you don't have a lift. First things first. Disconnect neg. bat. cable. Raise up on jack stands. Disconnect drive shafts and tape bearings caps on drive shafts. Remove Starter. Disconnect wiring harness plugs from transmission and transfer case. The wiring harness connection on the shift linkage does not remove. There are 2 connectors and are glued at factory. Remove whole shift linkage unit from side of trans. Remove exhaust. Remove dust cover. Mark spot on flywheel and tourque converter, then remove bolts from flywheel. Support trans. with jack. Remove transfer case bolts from trans. Remove mount nuts from transfer case bolts. Remove bell housing bolts from motor to trans. Remove bolts from crossover support for transfer case mount from the main frame. Raise up transmission and remove crossover support. One guy now supports transfer case and other works transfer case loose. The transfer has to be jockeyed around until it drops out. It will not come straight out or down because of the tor. bar support frame. It has to be wiggled out and down. Guy supporting transfer case gets trans fluid bath and this is all muscle work. With transfer case out, put another jack under motor for support or risk breaking motor mounts and other things. Slide transmission back and lower down and its free, It is a very dirty, oily, nasty hard job. I just went through it. I wouldn't do it again. If you can afford it, take it to a pro. Well worth it. Remember once started, your pretty much commited. Reverse the whole thing to install. Good Luck

    Feb 01, 2009 | 1999 Chevrolet Silverado 1500

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