Question about 2006 Pontiac Montana SV6

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Rear differential clutch pump actuator check valve

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Posted on Jan 02, 2017

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SOURCE: where is the clutch pump actuator check valve

it's on the rear wheel drive compartment b672020.gif

Posted on Jul 18, 2010

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Just bought 2003 Aztec and the AWD is disabled how do i know if something is wrong . We could not find AWD button ? ??


AWD Disable indicator
The AWD Disable indicator is located in the instrument panel cluster. This lamp is used to inform the driver that the AWD system has been disabled and no torque will be applied to the rear wheels during a slip condition. The AWD Disable indicator is controlled by the powertrain control module via a class 2 message.
Powertrain Control Module
The powertrain control module monitors the data from the ABS controller and Rear Drive Module (RDM) for proper operating conditions. If inappropriate conditions are present the PCM commands the differential clutch pump actuator check valve closed, disabling the AWD system. The PCM also commands the AWD Disable indicator on.
Is the All-Wheel Drive Disabled Indicator Always On ?

Is

Oct 25, 2016 | Cars & Trucks

1 Answer

1990 GMC suburban actuator and fuse location. There is not one on front differential and no place for fuse in fuse block. 4 wheel will not engage. No owners manual


The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

Sep 25, 2016 | 1990 GMC Suburban

1 Answer

AWD disabled, why


Wheel sensor/bearing bad, wire by the bearing broken,ABS module bad, bad ground wire for the ABS pump, ABS pump bad, The actuator/switch in the rear differential is bad, the wire for the rear switch is broken, the clutches in the rear differential are worn out. No oil in the rear differential (which trashes out the differential). And the fuses could be blown. I think I have covered all of it. From older ones to newer ones.

Mar 27, 2015 | Cars & Trucks

1 Answer

4x4 won;t ingage,2000 chevy tracker


Hi Wayne how's it going ? Here is a Transfer Case Circuit Description ! then I will get into some possibility's of what could be wrong !
There are two main components for the four wheel drive. The powertrain control module (PCM) and the front drive axle actuator pump. The pump is controlled by the PCM. The pump compresses air to engage the front axle. When the transfer case is in four wheel drive (4H or 4L), the four wheel drive switch closes providing a ground signal to the PCM. The PCM actuates the pump which pressurizes the actuator in the front axle. This pressure engages the axle hub which connects the front drive shaft to the axle shafts, allowing the transmission/transfer case to turn the front wheels. The PCM will not operate the pump for more than 10 seconds in order to protect it. The PCM will also provide a path to ground for the 4WD indicator in the instrument cluster. The indicator is provided battery voltage when the ignition switch is in the ON or START position through the IG fuse. With power and ground supplied, the indicator lights.
When the transfer case is in 4L (with auto trans), the four wheel drive low switch sends a ground signal to the PCM. The PCM will not engage the torque converter clutch while this signal is being received.
When the transfer case is returned to the two wheel drive mode, the release valve in the pump opens and releases the pressure in the actuator. Without pressure, the hub disengages.The PCM also releases the ground to the 4WD indicator which causes the indicator to turn off.
Does the four-wheel drive indicator light with 4x4 engaged ? DEFINITION: The 4WD indicator does not illuminate with 4WD engaged. All other engine and transmission functions are normal. Refer to: Electric Motor and Actuator Check in Driveline/Axle-Front Axle (w/diff).
The next step of testing the electric motor an actuator involve a lot of steps an a special tool -
J 43846 Actuator Pressure Gauge
This a factor diagnostic flow chart , I'm not familiar with the in's an out's of this system , the most probable thing's that go wrong with this system. If you want I can send you the diagnostic flow chart !
Electric Motor and Actuator Check
Tools Required J 43846 Actuator Pressure Gauge
  1. Raise the vehicle. Support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. If the vehicle is equipped with an engine skid plate, remove the four bolts that hold the skid plate in place. Remove the front skid plate from the vehicle.
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  4. Install theJ 43846 with the air hose connecting between the air pump assembly and the front differential actuator.
  5. Tighten the adjusting knob as far as it stops.
  6. Important: Be careful not to bend any part of the hose.
  7. Turn on the ignition switch and shift transfer lever from 2H to 4H range.
  8. Make sure to check that the motor of the actuator starts running (a running sound can be heard) within 1 second and it stops when the actuator pressure gauge indicates specified pressure. Check for air leakage during the procedure. Pressure specification is: 38.0 kPa (5.40 -- 8.25 psi).
  9. Check that the pressure indicated on the gauge drops as soon as the transfer lever is shifted to the 2H position.
  10. Start the motor of the actuator pump by shifting the transfer lever to the 4H position again. Loosen the adjusting knob to lower the pressure on the gauge. The actuator motor should start to run again and stop in about 4 seconds.
  11. With the adjusting knob of the actuator pressure gauge loosened, shift the transfer shift lever to neutral or the 2H position and then 4L or 4H position. Pump motor should stop in about 10 seconds after the motor starts to run.
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  12. tif.gif
  13. Disconnect the air hose (2) from the actuator pump assembly and connect it the front differential air hose inlet. Loosen the adjusting knob.
  14. Connect the air compressor air hose to the actuator pressure gauge.
  15. Compress air into the actuator pressure gauge and turn knob to obtain specified pressure. Specified pressure : 38.0 kPa (5.40 psi)
  16. While both wheels are lifted off the ground, turn one of the front wheels by hand and check the other wheel for the following:
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When applying pressure to the actuator pump the other front wheel should turn in the direction opposite to the wheel being turned by hand.


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When the actuator pump is not working (by not applying pressure) the other front wheel should remain stationary while the wheel turned by hand is turning.


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Install the actuator pressure gauge to the actuator pump assembly (1) .


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Install a voltmeter and the battery to the pump assembly (1) .


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Tighten the adjusting knob as far as it will stop and the air check side opening by a hose as a blind plug.


?€¢
Check that the actuator assembly motor starts to run (a running sound can be heard) when the battery is connected and when it stops when specified pressure is obtained. Specified pressure is: 38.0- 58.0 kPa (5.40 -- 8.25 psi).


?€¢
Ensure that the voltmeter is within specifications when the motor is running should be about 0v and when the motor has stopped it should be about 10 -- 14v
good luck !


Jan 27, 2015 | 2000 Chevrolet Tracker

1 Answer

2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

May 11, 2017 | 2003 GMC Envoy

1 Answer

Have a 2004 Avalanche 1500 that has rear end noise that get louder turning to the right and goes away turning to left. Also upon excelatation noise not so loud coasting noise get louder have checked rear...


Suspect a worn left side spider gear or it's bearing in the differential. If a limited-slip differential, the left side clutch may be grabbing somewhat. In any case, the differential will need to be removed from the case to service any worn or defective components. Rear end service is not for inexperienced mechanics. Have you checked the fluid level in the differential? Hope this helps!

Nov 05, 2010 | Chevrolet Avalanche Cars & Trucks

1 Answer

Front differential quit


Does that have an electric clutch? I'm thinking it does ... I'm not really the guy to give you a comprehensive answer on this ... but check the power to the clutch.

Thanks for your interest in FixYa.com

Feb 26, 2010 | 1997 GMC Sierra

2 Answers

Feels like the rear wheels are slipping around 55mph


do you have a posi rear differinal .if so maybe the clutch pack is slipping and if thats it try replacing the oil with a clutch pack oil used on posi rear ends

Jun 22, 2009 | 2001 Ford F150 Styleside SuperCrew

3 Answers

4 wheel drive won't work


There is a vacum powered actuator on the front differential housing on the passenger side. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold. If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. Most likely it will be the actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). If this doesn't lead you to the trouble it's probably a mechanical problem inside the differential. However most likely there would other noises.

Dec 20, 2008 | 1992 Jeep Wrangler

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