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how to replace the front impact sensor on a 2005 chevy avalanche

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1999-2002 CHEVROLET SILVERADO 2000-2002 CHEVROLET TAHOE, SUBURBAN 2002 CHEVROLET AVALANCHE 1999-2002 GMC SIERRA 2000-2002 GMC YUKON, YUKON XL LOCATED IN THE SEVERE CORROSION AREAS LISTED BELOW Service Procedure The following procedure provides instructions for repairing a corrosion condition where the front wheel speed sensor mounts on the front wheel bearing assembly. 1. Raise the vehicle on a suitable hoist and support as necessary. 2. Remove both front tires and wheels. 3. Compress the front brake caliper pistons. 3.1. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad. 3.2. Slowly tighten the C-clamp until the pistons are pushed completely into the caliper bores. 3.3. Remove the C-clamp from the caliper. Important: It is not necessary to remove the front brake caliper from the bracket when removing the bracket in the next step. 4. Remove the two bolts that attach the front brake caliper mounting brackets to the knuckle. Notice: Support the brake caliper with heavy mechanic’s wire, or equivalent, whenever it is separated from its mount, and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak. 5. Remove the brake caliper and bracket as an assembly and support it with heavy mechanic’s wire or equivalent. DO NOT disconnect the hydraulic brake flexible hose from the caliper. 6. Mark the relationship of the rotor to the bearing hub. 7. If equipped, remove the rotor retaining push nuts from the wheel studs

4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0500, P0836, P1875 Set (Replace Encoder Motor Sensor, Reprogram TCCM, Inspect Front Drive Axle Engagement Sleeve for Damage/Repair if Necessary)

Correction Important: For ease of reassembly, shift the transfer case assembly to 2HI for the NV263 (NP1), or Neutral for the NV246 (NP8) prior to removing any components. For information on placing the NV246 (NP8) transfer case in NEUTRAL, see the procedure at the end of this bulletin. 1. Remove the transfer case and front axle/engine skid plates (if equipped). 2. Disconnect and position the front propeller shaft aside. 3. Disconnect the transfer case encoder motor wiring harness. 4. Remove the three (3) bolts that retain the encoder motor to the transfer case. 5. Separate the encoder motor assembly from the transfer case and place it on a work bench. Important: DO NOT REMOVE THE SCREWS INDICATED WITH THE (1) IN THE ABOVE ILLUSTRATION. 6. Remove the four screws on the outer perimeter of the encoder motor housing. Important: For proper timing and ease of reassembly, hold the gear in place as your remove the cover from the encoder motor assembly with your thumb or finger. 7. Carefully remove the cover from the encoder motor assembly. The cover has a seal on the bottom side. Place the cover in a position to protect this seal from damage and/or contamination. Important: Observe the location of the punch mark on the large gear in relation to the timing mark on the housing if the transfer case was placed in the 2HI for the NV263 (NP1), or Neutral for the NV246 (NP8). The timing marks should be within one tooth of proper alignment. If not, you must note the timing mark positions for reassembly. 8. Locate the two shims; one on the small gear and another on the larger gear. Set them aside on a clean surface for reuse. Important: After removing the large gear from the housing, a dark gray phenolic spacer should remain in the casting where the bottom of the large gear resides. Locate this spacer and save for reuse. 9. Carefully lift the large gear from the housing. The sensor and wiring harness will come with the gear. 10. Disconnect the wiring from the sensor. 11. Separate the sensor from the large gear.


ISSUE b. If new level (47 fin) rotors are present, Some 2004/2005 F-150 vehicles built before perform one (1) of the following: 11/29/2004 may exhibit front brake roughness and or shudder while braking. (1) If rotors are within minimum thickness specifications, machine the rotors using ACTION the Rotunda on vehicle brake lathe and Service the rack and pinion, rotors, and caliper the Rotunda adapter kit 201-R0093. assemblies as needed, based on vehicle build date Refer to the Workshop Manual, Section and current part levels installed on the vehicle. 206-00 for the correct on-vehicle brake Refer to the following Service Procedure. lathe procedure. SERVICE PROCEDURE (2) If rotors are beyond machinable thickness, the front rotors must be 1. Vehicles built prior to 8/20/2003 require the replaced. replacement of the rack and pinion assembly if it has not been replaced. Refer to Workshop 3. Install new service fix calipers. Manual, Section 206-03 and 211-02. NOTE 2. Determine if the vehicle has the old or new REPLACE CALIPERS WITH NEW SERVICE FIX level rotors (Figure 1). CALIPER ASSEMBLIES BY REMOVING THE CALIPERS AT THE KNUCKLES. THE SERVICE REPLACEMENT CALIPERS WILL BE PRE-ASSEMBLED WITH ANCHOR, SPRINGS, AND PADS. THE CALIPERS SHOULD BE INSTALLED AS A UNIT WITHOUT DISASSEMBLY. PART NUMBER PART NAME 6L3Z-2B120-A Caliper Asy (Right Side) 6L3Z-2B121-A Caliper Asy (Left Side) 5L3Z-1102-AB Rotor (4X2, 6 Lug) 5L3Z-1102-BA Rotor (4X2, 7 Lug) 5L3Z-1125-AA Rotor (4X4, 6 Lug) 5L3Z-1125-BA Rotor (4X4, 7 Lug) 6L3Z-3504-AA Steering Gear (Super Cab/Crew 4X2) 6L3Z-3504-BA Steering Gear (Super Cab/Crew 4X4) Figure 1 – Article 05-21-19 6L3Z-3504-CA Steering Gear (Regular Cab 4X2) 6L3Z-3504-DA Steering Gear (Regular Cab 4X4) a. If old level rotors, replace the front rotors 6L3Z-3C294-AA Retainer Spindle Nut and front caliper assemblies. Refer to Workshop Manual, Section 206-00 for front rotor and caliper replacement.

2003-2005 FORD Explorer Sport Trac Alignment – Irregular Front Tire Wear SERVICE PROCEDURE

ISSUE Some 2003-2005 Explorer Sport Trac vehicles equipped with the Goodyear Wrangler RT/S, P255/70R16 109S AT OWL tire, may exhibit signs of feathering heel-toe wear on the inside or outside edges of the front tires . Tire noise may also be present during regular highway drive or when braking. ACTION Inspect the tires for feathering heel-toe wear. It may be necessary to rotate or replace tires and reset toe. Refer to the following Service Procedure. SERVICE PROCEDURE Zoom Sized for Print 1. Visually inspect the front tire’s inside and outside shoulder ribs (Figure 1) 2. Measure the difference in tread depth of the leading edge compared to trailing edge, of the most-worn lug (figure 2). If the average difference in tread depth between leading and trailing edge is less than 2 mm, rotate the tires . If the average difference is more than 2 mm, replace the front tires. Also inspect the rear tires and replace if necessary. 3. Ensure that the camber and caster readings are within specification

3406E Truck Engine Installation OR Removal Of The Speed/ Timing Sensor

1. Disconnect the speed/timing connector “P9/J9″ (2) . Inspect the connector for the following conditions. * Corrosion * Bent pins * Missing pins * Damaged sockets * Mismating * Broken wires 2. Remove the Speed/timing sensor (1) from the front gear cover. 3. Examine the plastic end of the sensor for signs of wear or contaminants such as metal filings. The plastic end of the speed/timing sensor should have no contaminants and should show no wear (greater than 0.051 mm (0.0020 inch) from the face) . 4. Use a screwdriver to carefully pry the plastic sensor end to the fully extended position (approximately 4.775 mm (0.1880 inch) beyond the metal housing of the sensor). 5. Gently push in on the plastic end of the sensor. The plastic end should be firm. The plastic end should resist movement in the retract direction. If there is no resistance replace the sensor 6. Remove the two bolts (3) and remove the cover (5) from the flywheel housing. This hole is used for engine turning. 7. Put one bolt (3) in the timing bolt location (4) . The timing bolt location is approximately 127 mm to 152 mm (5 inch to 6 inch) above the hole in the flywheel housing for engine turning. I 8. Use 9S-9082 Engine Turning Tool (6) and a 1/2 inch drive ratchet wrench to turn the engine flywheel in the direction of normal engine rotation. The normal engine rotation is in a counterclockwise direction when viewed from the flywheel end. Turn the engine flywheel until the timing bolt engages with the threaded hole in the flywheel. Note: Visually check the location of the tooth on the wheel on which the speed/timing sensor is to be positioned. The end of the sensor must be in alignment with a tooth on the wheel and not in alignment with the valley of the wheel. Note: The No. 1 piston must be at either top center of the compression stroke or at top center of the exhaust stroke. 9. Inspect the speed/timing sensor before installation. Use steps 3 through step 6 to inspect the sensor. 10. If the sensor end is not fully extended, use a screwdriver to carefully pry the plastic sensor end to the fully EXTENDED position approximately 4.775 mm (0.1880 inch) beyond the metal housing of the sensor.