TRANSMISSION AX4N FRONT WHEEL DRIVE,SHIFT SOLENOID

Shift motor on the transfer case, 4X4 control module, vacuum to vac solenoid. Did you hook up a scan tool an check for codes?

The electronic shift on the fly (ESOF) system is an electronic shift system that allows the operator to choose between 2 different 4-wheel drive modes as well as 2-wheel drive. The operator can switch between 2WD and 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L range, the vehicle speed must be less than 5 km/h (3 mph), the brake pedal pressed and the transmission must be in NEUTRAL (or the clutch pedal pressed in manual transmission vehicles).
When the mode select switch (MSS) on the instrument panel is turned, the 4WD control module (PCM) activates the electromagnetic clutch and powers the transfer case shift motor. When the shift motor reaches the desired position, as determined by the contact plate position inputs to the 4WD control module (PCM), power to the shift motor will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the mainshaft hub to the drive sprocket. Finally, the front axle integrated wheel ends (IWEs) are engaged and the electromagnetic clutch is deactivated.

Feature Inputs:
• Mode select switch (MSS)
• Wheel speeds (via CAN communication)
• Contact plate position inputs A, B, C, D (grounded when closed, open circuit when open)
• Transmission neutral
• Brake ON/OFF (BOO)

Feature Outputs:
• Transfer case synchronization clutch
• Transfer case shift motor relays
• Integrated wheel-end (IWE) vacuum solenoid
• Instrument cluster indicators (via CAN communication)
• 4WD mode (via CAN communication to PCM)

What light's don't come on ? 4X4 switch ? The GEM - generic electronic module controls the 4X4 system . Checking for DTC'S -diagnostic trouble codes is the first step in the diagnostic process . You miss thing's if you don't . Your best bet , take it to a qualified repair shop. Replacing parts without knowing what's going on never works .
P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM REFER to Section 413-01A . P1806 Transmission 4-Wheel Drive High Indicator Short Circuit to Battery GEM REFER to Section 413-01A . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM REFER to the Symptom Chart. P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM REFER to the Symptom Chart. P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test A . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test A . P1824 Transmission 4-Wheel Drive Clutch Relay Circuit Failure GEM GO to Pinpoint Test E . P1826 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery GEM GO to Pinpoint Test E . P1828 Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test A . P1830 Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test A . P1832 Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure GEM GO to Pinpoint Test C . P1834 Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit to Battery GEM GO to Pinpoint Test C . P1838 Transmission Transfer Case Shift Motor Circuit Failure GEM REFER to the Symptom Chart. P1846 Transmission Transfer Case Contact Plate 'A' Circuit Failure GEM REFER to the Symptom Chart. P1850 Transmission Transfer Case Contact Plate 'B' Circuit Failure GEM REFER to the Symptom Chart. P1854 Transmission Transfer Case Contact Plate 'C' Circuit Failure GEM REFER to the Symptom Chart. P1858 Transmission Transfer Case Contact Plate 'D' Circuit Failure GEM REFER to the Symptom Chart. P1866 Transmission Transfer Case System Concern - Servicing Required GEM REFER to the Symptom Chart. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM REFER to the Symptom Chart. P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test C . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test C . P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit GEM REFER to the Symptom Chart.
SECTION 308-07A: Transfer Case - General Information 2002 F-150 Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/20/2001 Transfer Case - Electronic Shift on the Fly (ESOF) Operation The electronic shift on the fly (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 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L range, the vehicle speed must be less than 5 km/h (3 mph), the brake pedal 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 driveline when shifting from 2WD to 4H 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 mainshaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.
Shifts between 2WD and 4H can be made at any speed up to 88 km/h (55 mph). 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; go to Table 1).
• Contact plate position inputs A, B, C, D (grounded when closed, open circuit when open; go to Table 4).

Feature Outputs:

• 4x4 shift motor relay outputs (go to Table 2).
• Transfer case clutch relay (grounded when relay is activated, open circuit when relay is deactivated).
• 4x2/4x4 vacuum solenoid (grounded when activated, open circuit when deactivated).
• Cluster indicators (ground when activated, open circuit when deactivated).

When shifting into or out of 4L, the GEM requires that the vehicle speed be less than 5 km/h (3 mph), the brake is applied, and the transmission is in NEUTRAL.
Feature Inputs:

• 4WD Mode Switch (various resistances; go to Table 1).
• Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open; go to Table 4).
• Output Speed Shaft (OSS) Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
• Brake Input (battery voltage when brake is depressed, open circuit when not activated).
• Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
• Start/Clutch Depressed Input (go to Table 3).

Feature Outputs:

• 4x4 Shift Motor Relay Outputs (go to Table 2).
• 4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
• Cluster Indicators (grounded when activated, open circuit when deactivated).

Have it check for DTC'S - diagnostic trouble codes ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G . - For All Other DTCs GEM GO to Section 419-10 .
Your best bet , take it to a qualified repair shop that has the diagnostic tool to trouble shoot .
Principles of Operation
Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:

• mode select switch (MSS)
• vehicle speed signal (transmitted from the ABS system)
• gearmotor encoder plate position
• brake pedal switch
• digital transmission range (TR) sensor (automatic transmission)
• clutch pedal position (CPP) switch (manual transmission)
• ignition switch

Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:

• low to high relay (clockwise)
• high to low relay (counterclockwise)
• pulse vacuum hublock (PVH) solenoid
• gearmotor encoder assembly

The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.

Start by looking at the fuse box... check all the fuses. Next possibility is a relay.

The Suzuki Jimny Transmission Control Module (TCM) is an electronic circuit component that controls gear shift, TCC lock-up and idle-up according to the signal from each sensor. It is a microcomputer consisting of an IC, transistor, diode, etc. It is installed behind glove box.

1. Ignition switch
2. Transmission range sensor
3. Input shaft speed sensor
4. Output shaft speed sensor (A/T VSS)
5. Shield wire
6. Vehicle speed sensor (VSS)
7. Transmission fluid temperature sensor
8. Shift solenoid-A (Shift solenoid No.1)
9. Shift solenoid-B (Shift solenoid No.2)
10. Shift solenoid-C (Shift solenoid No.3)
11. Shift solenoid-D (Shift solenoid No.4) 12. TCC solenoid (Lock-up solenoid)
13. "O/D" cut switch
14. "O/D OFF" lamp
15. Monitor connector No.2
16. DLC
17. To ECM
18. To A/C
19. To brake lamp switch
20. To main relay
21. Terminal arrangement of TCM coupler

The shift solenoid valves are two identical, electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These valves are normally open. These shift solenoid valves work together in a combination of ON and OFF sequences in order to control the positions of the 1-2, 2-3, and 3-4 shift valve trains. The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transmission gear for the vehicle operating conditions.
Remove the transmission side cover. Refer to Control Valve Body Cover Replacement . Remove the 1-2 shift solenoid retainer clip (304), the 1-2 shift solenoid (305) with O-ring (303), the 1-2 shift valve (302), and the 1-2 shift valve spring (301).
Remove the PNP switch. Refer to Park/Neutral Position Switch Replacement . Remove the transmission upper side cover bolts. Install the engine support fixture. Refer to Engine Support Fixture in Engine Mechanical. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Remove the left front tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels. Remove the left inner fender liner. Refer to Front Fender Liner Replacement in Body Front End. Remove the wheel drive shaft from the transmission. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts. Remove the power steering gear mounting bolts. Refer to Steering Gear Replacement in Power Steering. Remove the frame. Refer to Frame Replacement in Frame and Underbody.
This is a tough repair an needs special tools to do it . your best bet is take it to AAMCO

You have Google & You Tube Video

It's all there,just ask the questions & watch

Manual shift or Four-Wheel Drive Systems - Electronic Shift I'm assuming you have electronic shift because you refer to relay clicking behind the instrument panel . Principles of Operation Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:

• mode select switch (MSS)
• vehicle speed signal (transmitted from the ABS system)
• gearmotor encoder plate position
• brake pedal switch
• digital transmission range (TR) sensor (automatic transmission)
• clutch pedal position (CPP) switch (manual transmission)
• ignition switch

Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:

• low to high relay (clockwise)
• high to low relay (counterclockwise)
• pulse vacuum hublock (PVH) solenoid
• gearmotor encoder assembly

The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.
Do you know what DTC'S - diagnostic trouble code's are ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G .
Your best bet , take it to a qualified repair shop .

Without knowing how the 4X4 works you don't have much chance of finding the problem , (tapping on stuff ) ? There is an electronic control module that makes this system work . Could have DTC'S - diagnostic trouble code's stored in the (GEM)
Transfer Case -Electronic Shift on the Fly (ESOF) Operation The electronic shift on the fly (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 4H mode at speeds up to 88 km/h (55 mph). To engage or disengage 4L range, the vehicle speed must be less than 5 km/h (3 mph), the brake pedal 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 driveline when shifting from 2WD to 4H 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 mainshaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.
Shifts between 2WD and 4H can be made at any speed up to 88 km/h (55 mph). 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; go to Table 1).
• Contact plate position inputs A, B, C, D (grounded when closed, open circuit when open; go to Table 4).

Feature Outputs:

• 4x4 shift motor relay outputs (go to Table 2).
• Transfer case clutch relay (grounded when relay is activated, open circuit when relay is deactivated).
• 4x2/4x4 vacuum solenoid (grounded when activated, open circuit when deactivated).
• Cluster indicators (ground when activated, open circuit when deactivated).

When shifting into or out of 4L, the GEM requires that the vehicle speed be less than 5 km/h (3 mph), the brake is applied, and the transmission is in NEUTRAL.

Feature Inputs:

• 4WD Mode Switch (various resistances; go to Table 1).
• Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open; go to Table 4).
• Output Speed Shaft (OSS) Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
• Brake Input (battery voltage when brake is depressed, open circuit when not activated).
• Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
• Start/Clutch Depressed Input (go to Table 3).

Feature Outputs:

• 4x4 Shift Motor Relay Outputs (go to Table 2).
• 4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
• Cluster Indicators (grounded when activated, open circuit when deactivated).
• P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM REFER to Section 413-01A . P1806 Transmission 4-Wheel Drive High Indicator Short Circuit to Battery GEM REFER to Section 413-01A . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM REFER to the Symptom Chart. P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM REFER to the Symptom Chart. P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test A . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test A . P1824 Transmission 4-Wheel Drive Clutch Relay Circuit Failure GEM GO to Pinpoint Test E . P1826 Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery GEM GO to Pinpoint Test E . P1828 Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test A . P1830 Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test A . P1832 Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure GEM GO to Pinpoint Test C . P1834 Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit to Battery GEM GO to Pinpoint Test C . P1838 Transmission Transfer Case Shift Motor Circuit Failure GEM REFER to the Symptom Chart. P1846 Transmission Transfer Case Contact Plate 'A' Circuit Failure GEM REFER to the Symptom Chart. P1850 Transmission Transfer Case Contact Plate 'B' Circuit Failure GEM REFER to the Symptom Chart. P1854 Transmission Transfer Case Contact Plate 'C' Circuit Failure GEM REFER to the Symptom Chart. P1858 Transmission Transfer Case Contact Plate 'D' Circuit Failure GEM REFER to the Symptom Chart. P1866 Transmission Transfer Case System Concern - Servicing Required GEM REFER to the Symptom Chart. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM REFER to the Symptom Chart. P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test C . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test C . P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit GEM REFER to the Symptom Chart. Your best bet , take it to a qualified repair shop. Tapping on thing's isn't the way to diagnose

Are you referring to a transmission shift solenoid, or the shifter lockout solenoid? The shift solenoids, that control the shifting of the transmission, are located internally in the trans, specifically in the valve body. The shifter lockout solenoid, which is the solenoid that prevents you from shifting out of park, without depressing the brake pedal, is located in the shifter assembly itself, below the center console.

The transmission solenoids are located just inside the fluid pan. Here is some info for replacing them. It is acually pretty easy.

I own a 2002 '''Ford '''Focus with automatic '''transmission. The symptoms are that the '''transmission disengages (slips out of gear) when it goes into 3rd gear. When the car slows down to 20 miles an hour or so (or when you stop) it re-engages. You can drive the car in 1st or 2nd gear generally. The '''transmission light comes on. There are no noises associated with this problem. If you have this problem then it's probably the "A" '''Solenoid that needs to be replaced. Here's how you make sure that's the case and fix it for $50.

1. You need to pull the diagnostic computer codes. '''Ford will pull them for you for $100. But, you can do it for free by going to AutoZone. They have a loaner computer diagnostic code puller. If you bring the car they'll just do it for you in the parking lot. If you want to borrow the tool then they will want a $200 security deposit. I recommend that you bring the car to them if you it's close. Also, there are lots of small shops that will pull the code for you for free. There's no reason to pay a "diagnostic fee" to pull the computer repair code. This code will tell you Exactly which '''solenoid to replace. It's typically the "A" '''solenoid, though.

2. Once you get the code you need to know which '''solenoid to replace.

3. It's fairly easy to replace the '''solenoid. You need a 5/16 socket and rachet and a tube of Gray RTV Gasket Maker (you can get it at any auto parts store).

4. You need to buy the '''solenoid. I only found it at '''Ford. For some reason when I told 3 different parts managers I wanted the "A" '''solenoid (which is how it's described in every '''Ford '''transmission diagram and on the computer code) they didn't know which one it was. There are 6
5. For the repair you need to raise the front of the car. I used ramps, but make sure it's secure. The transaxle ('''transmission) is in the front right, as you look at the car. The bottom is a pan, like an oil pan, with about 20 bolts holding it on. They're 5/16th's. There's '''transmission fluid in the pan, but no "drain bolt". So, have a pan ready to catch the fluid once the '''transmission pan comes loose. Be careful. '''Transmission fluid is hot, it will make a mess. And, the pan has a silicone gasket seal around it. So, once you get the bolts off/loose you will probably need to work the pan loose. Don't bend it. (Make sure you get all the bolts off, it's easy to miss one.) I left one bolt on the front so I could ease the pan loose from the '''transmission on the back and let the fluid run into a pan. Then I removed the pan.

6. You will see SIX '''solenoids in the '''transmission. You can't miss them. Each one has a different colored wire going to it. The A '''Solenoid has a white wire going to it, it's a small '''solenoid in the center on the right. It's held in place by one bolt (that's also 5/16ths). Unplug the wire, remove the bolt and remove the '''solenoid. Put the new '''solenoid in.

7. Carefully and completely scrape all the old gasket off the '''transmission surface the the edge of the fluid pan. Clean it. Then apply the new gasket (from the tube) onto the edge of the pan. It is VERY IMPORTANT that you just apply a thin bead of gasket compound. Don't use too much or the excess will get into your '''transmission and cause a problem.

8. Replace the pan. Let the gasket set according to the instructions on the tube - READ THE INSTRUCTIONS. And refill the '''transmission with '''transmission fluid. I was told to use the same fluid I took out, by someone I trust. You use a funnel and refill it through the '''transmission dipstick tube (front, right of the engine, yellow handle). Make sure you put it in the right place. Fill it slowly. Then run the engine and check the fluid. Add until it reads correctly on the dipstick. You check '''transmission fluid with the car running and the fluid hot.

9.

You may want to change the vehicle speed sensor first. Is your speedometer working? The shift solenoids are inside the side cover of the transmission and it's quite a job to get that cover off, you practically have to take the trans out of the car. Are you getting a "check engine" light there may be a code in the computer that will tell you what is going on. If one of those solenoids fail it should trigger a "check engine" light, the solenoids are usually pretty trouble free as a rule. I'm not sure on that transmission, but I think there are two shift solenoids, but there is also a "torque converter clutch solenoid". Also, if you can get it to a trany shop they can put a scan tool on your car and tell you exactly what's happening. Have you tried manually shifting the car? Pull it down into 1 then manually shift it up, see if it will shift that way.