Follow by Email

Tuesday, September 16, 2014

Duramax Diesel Allison Transmission Fast Learn Procedure

Duramax Equipped With a Allison Transmission Fast Learn Procedure 

Initial Test Automatic 5 or 6 Speed Transmission 

In general, Fast Learn is a procedure for Allison 1000 Series transmissions in which a series of tests are run to allow the transmission control module TCM to learn individual Clutch characteristics. Once the clutch data is learned, Fast Learn translates it to the adaptive data cells, which the TCM uses for clutch control during range shifts. Fast Learn is used at GM plants, and allows the vehicle to be driven out of the assembly plant in a near fully adapted state to minimize any customer shift concerns. The scan tool version of Fast Learn is intended to provide the same benefit following transmission repair or replacement at your local shop or Diesel Transmissions Performance Specialist.                                   BD Diesel Power Or ATS Diesel Performance 

Fast Learn must be used when one of the following repairs have been made to the vehicle:
  • Transmission replacement or internal service/overhaul
  • Valve Body repair or replacement, including replacement of the pressure control solenoids
  • Transmission Control Module replacement
  • Transmission Control Module software/calibration update
  • Any service in response to a shift quality concern
The scan tool is used to initiate Fast Learn by selecting the following commands:
  • F3: Special Functions
  • F1: Transmission Output Controls
  • Fast Learn Tech II or Snap-On Tool 
When performing Fast Learn, the following conditions must be met:
  • Block the drive wheels.
  • Apply the parking brake.
  • Apply the service brake during DRIVE and REVERSE.
  • 0 percent throttle and engine at idle RPM
  • Transmission sump temperature is between 40-100°C (104-212°F) 
  • If equipped, 4WD Transfer Case in 2WD
If at any time during the procedure, required conditions are not met, Fast Learn may abort and the process will need to be started again from the beginning.

Three steps are required to successfully complete the Fast Learn procedure:
  1. PARK Mode
  2. DRIVE Mode
  3. REVERSE Mode
PARK Mode

While the transmission is in PARK, with the engine idling, FastLearn will cycle through a series of tests where the 3rd, 5th and reverse clutch and the 2nd clutch is repeatedly applied to learn their clutch characteristics. During the 3rd, 5th and reverse clutch and 2-6 clutch apply/release procedure, Fast Learn is able to characterize the pressure control solenoid 1 and pressure control solenoid 2 pressures corresponding to clutch return springs, and is also able to learn the volumes for the 3rd, 5th and reverse clutch and 2-6 clutch packs. In addition, the low and reverse clutch is repeatedly applied and released in PARK to purge out air for later learning of the clutch volume.

DRIVE Mode

Block the wheels before selecting DRIVE. While in DRIVE, if the Scan Tool loses communication or becomes disconnected, the vehicle could move forward. Failure to block the wheels could result in personal injury or property damage.

Once all of the PARK test data have converged, the scan tool instructs the driver to select DRIVE. Once DRIVE is selected, the Transmission Control Module engages the 1-2-3-4 clutch to obtain DRIVE and learn 1-2-3-4 clutch volume. The TCM repeats this test until the volume learned for the 1-2-3-4 clutch has converged. The TCM then engages 4-5-6 clutch until the volume is learned and 4-5-6 clutch has converged.

REVERSE Mode

Block the wheels before selecting REVERSE. While in REVERSE, if the Scan Tool loses communication or becomes disconnected, the vehicle could move backward. Failure to block the wheels could result in personal injury or property damage.

Next, the scan tool instructs the driver to select REVERSE. Once REVERSE is selected, the Transmission Control Module engages the low and reverse clutch to obtain REVERSE and to learn the low and reverse clutch volume. The TCM repeats this test until the volume learned for the low and reverse clutch has converged.
 All shifts will be left in fast adaptive mode at this point.

After learning the 1-2-3-4 and the low and reverse clutch volume, FastLearn updates the adaptive volume data for all shifts with either the 1-2-3-4 or the low and reverse on-coming clutch

Troubleshooting

If Fast Learn will not run and the above stated conditions have been met, ensure the following:
  • Transmission fluid temperature is between 40-100°C (104-212°F).
  • Closed throttle and engine at warm idle RPM
  • No active DTCs
  • All Speed Sensor are connected and functioning properly.
  • Internal mode switch is functioning properly
  • Main pressure is within specification.
  • TCC slip speed less than 100 RPM at idle in PARK/NEUTRAL

www.toxicdiesel.com Toxic Diesel Performance 866-488-6942

Duramax Engine Oil Filter Replacement Procedure and Engine Oil Filter Service

GMC / Chevy Duramax Diesel Pickup 6.6L HD Truck 

Engine Oil and Oil Filter Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
  2. Position a suitable drain pan under the oil pan drain plug.
  3. Remove the oil drain plug 
  4. Allow the oil to drain completely.
  5. Clean and inspect the oil pan drain plug, replace if necessary.
  6. Clean and inspect the oil pan drain plug sealing surface, replace the oil pan if necessary.
  7. Wipe any remaining oil from the drain plug hole and re install the oil pan drain plug until snug.
  1. Position a suitable drain pan under the oil filter
  2. Remove the oil filter 
  3. Ensure that the oil filter gasket is still on the old oil filter, if not remove the oil filter gasket from the adapter.
Installation Procedure 
  1. Apply clean engine oil to the NEW oil filter gasket.
  1. Install the NEW oil filter  and tighten after contact plus 1 to 11/4 turn.
  1. Tighten the oil pan drain plug to  (18 lb ft) .
  2. Remove the oil drain pan from under the vehicle.
  3. Lower the vehicle.
  4. Fill the engine with new engine oil.
  5. Start the engine.
  6. Inspect for oil leaks after engine start up.
  7. Turn off the engine and allow the oil a few minutes to drain back into the oil pan.
  8. Remove the oil level indicator from the oil level indicator tube.
  9. Clean off the indicator end of the oil level indicator with a clean paper towel or cloth.
  10. Install the oil level indicator into the oil level indicator tube until the oil level indicator handle contacts the top of the oil level indicator tube.
  11. Again, remove the oil level indicator from the oil level indicator tube keeping the tip of the oil level indicator down.
  12. Check the level of the engine oil on the oil level indicator.
  13. If necessary, adjust the oil level be adding or draining oil.
  14. Check for oil leaks.
  15. Reset the oil monitor.
                                                                www.toxicdiesel.com  
866-488-6942

Thursday, September 11, 2014

Duramax Diesel Fuel Filter Life Reset Filter Reset Instructions

Fuel Filter Life Reset

This message will appear when a reset is performed either by using the steering wheel controls or following manual procedure.
  1. Reset the fuel filter monitor.
  2. For vehicles with steering wheel controls, press and hold the select button for 5 seconds while the FUEL FILTER LIFE message is displayed.
This message will appear on the driver information center (DIC) for ten seconds.
  1. For vehicles without steering wheel controls, do the following:
  1. Without pressing the pedals, turn the ignition key to the ON position without starting the engine.
  2. Wait 5 seconds.
  3. Completely press the brake and the accelerator pedals simultaneously and hold for 10 seconds. The system is now reset.
  4. Turn the ignition key OFF.
  1. The next time the engine is started, the message will no longer be displayed.
ALWAYS reset the FUEL FILTER LIFE system after a fuel filter change.

                                                 
www.toxicdiesel.com 866-488-6942

Duramax Diesel Pickup Fuel Filter Replacement

Instructions of Removal and Installation for a Duramax Diesel Pickup Fuel Filter 

Removal Procedure
  1. Drain the fuel from the fuel filter. Refer to Water-in-Fuel Draining. 
  2. Remove the right side wheel house liner. Refer to Front Wheelhouse Liner Replacement - Right Side GMC Front Wheelhouse Liner Replacement - Right Side Chevy
  3. Disconnect the water-in-fuel sensor wiring pigtail (2) from the engine wiring harness electrical connector.
  4. Remove the fuel filter from the fuel filter adapter.
  5. Remove the water-in-fuel sensor from the fuel filter.
  6. Note:
    Inspect the fuel heater element housing for contamination. Contamination on the fuel heater element housing may cause leakage at the fuel filter. Coat the fuel filter seal with clean engine oil
Installation Procedure 

  1. Install the water-in-fuel sensor to the NEW fuel filter, and tighten 1/2 turn after the seal contacts the filter.
  2. Install the NEW fuel filter to the fuel filter adapter, and tighten 1/4 turn after the seal contacts the filter adapter.
  3. Connect the water-in-fuel sensor wiring pigtail (2) to the engine wiring harness electrical connector.
  4. Prime the fuel system. Refer to Fuel System Priming 
  5. Start the engine. If the engine stalls, repeat the above step.
  6. Once the engine starts, inspect for fuel leaks.
  7. Install the right side wheel house liner. Refer to Front Wheelhouse Liner Replacement - Right Side GMC Front Wheelhouse Liner Replacement - Right Side Chevy

Tuesday, September 2, 2014

Duramax Allison Transmission Indication of Water in The ATF

                                                Indications of water in the ATF may include:

1ATF blowing out of the transmission vent tube.
2ATF may appear cloudy or, in cases of extreme contamination, have the appearance of a strawberry milkshake.
Visible water in the oil pan.
4A milky white substance inside the pan area.
5Spacer plate gaskets that appear to be glued to the valve body face or case.
6Spacer plate gaskets that appear to be swollen or wrinkled in areas where they are not compressed.
6Rust on internal transmission iron/steel components.
The transmission should be repaired or replaced based on the following Items:

If water or coolant is found in the transmission, the following components MUST be replaced.
1Replace all of the rubber-type seals.
2Replace all of the composition-faced clutch plates and/or bands.
3Replace all of the nylon parts.
4Replace the torque converter.
5Thoroughly clean and rebuild the transmission, using new gaskets and oil filter.

                                           BD Diesel offers a Double Stack Transmission Cooler

                                                   www.toxicdiesel.com 866-488-6942