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MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE

Service Precautions

Caution : Brake fluid may irritate eyes and skin. In case of contact, take the following actions:


Caution : To help avoid personal injury due to poor braking, DO NOT tap into the vehicle's brake system to operate a trailer brake system.

Notice : When fasteners are removed, always reinstall them at the same location from which they were removed. If a fastener needs to be replaced, use the correct part number fastener for that application. If the correct part number fastener is not available, a fastener of equal size and strength (or stronger) may be used. Fasteners that are not reused, and those requiring thread-locking compound will be called out. The correct torque values must be used when installing fasteners that require them. If the above procedures are not followed, parts or system damage could result.

Notice : Use only DOT 3 equivalent hydraulic brake fluid. The use of DOT 5 (silicone) brake fluid is not recommended. Reduced brake performance or durability may result.

Notice : Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables, or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, flush the area with water to lessen the damage.

Computer System Service Precautions

Take care to avoid electronic brake control module (EBCM) circuit overloading. In testing for opens or shorts, do not ground or apply voltage to any circuit unless instructed to do so by the diagnostic procedure. Test circuits only with a high-impedance multimeter. Never remove or apply power to any control module with the ignition switch in the ON position. Always turn the ignition to the OFF position before removing or connecting battery cables, fuses, or connectors.

General Service Precautions

Bleeding System

Replacement modulators are shipped already filled and bled. In normal procedures requiring removal of the modulator, such as to replace the EBCM, air will not enter the modulator, and normal bleeding will be all that is needed. For this procedure, refer to Section 4A, Hydraulic Brakes.
If air enters the hydraulic modulator, or if an unfilled modulator is installed, use the brake bleeding program in the scan tool to bleed the modulator. Manual bleeding of the hydraulic modulator is not possible.

J3B14F12
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ABS 5.3 assembly

(Left-Hand Drive Shown, Right-Hand Drive Similar)

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Disconnect the 31-pin ABS wiring harness connector from its socket on the EBCM.
  3. Cover the connector and the socket with shop cloths to protect them from brake fluid.

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    Notice : Take care not to allow air into the hydraulic unit or into the brake pipes from the master cylinder. If air gets into the hydraulic unit, it will require a bleeding procedure using a scan tool programmed for the ABS 5.3 system. As long as no air enters the hydraulic unit, a simple bleeding procedure is all the system will require.

  4. Remove the brake pipes from the hydraulic unit. It may be necessary to loosen the brake pipe nuts on the master cylinder to allow for moving those pipes out of the way.
  5. Loosen the mounting nuts on the hydraulic unit.
  6. Move the brake pipes aside far enough to allow for lifting the ABS 5.3 unit out of the mounting bracket.
  7. Tighten the brake pipe nuts on the master cylinder to avoid leaking brake fluid.
  8. Cap the brake pipes.

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Installation Procedure

  1. Insert the ABS 5.3 hydraulic unit into its mounting bracket and install the nuts.

    2. Tighten
    Tighten the ABS 5.3 mounting nuts to 15 N•m (11 lb-ft).

  2. Remove the screw plugs and install all of the hydraulic brake pipes.

    3. Tighten
    Tighten the brake pipe nuts to 22 N•m (16 lb-ft).

  3. Connect the 31-pin wiring harness connector J1.
  4. Connect the negative battery cable.
  5. Bleed the hydraulic system. Refer to Section 4A, Hydraulic Brakes.

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Front Wheel Speed Sensor

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Disconnect the front wheel speed sensor electrical connector.
  3. Raise and suitably support the vehicle.
  4. Remove the wheel. Refer to Section 2E, Tires and Wheels.
  5. Turn the steering wheel to expose the speed sensor. It is located at the rear of the steering knuckle near the tie rod end.
  6. Remove the bolt and the front wheel speed sensor from the steering knuckle.

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  7. Free the feedthrough grommet for the speed sensor harness and the hydraulic pipe from the strut tower. Remove the speed sensor harness from it so that the connector can pass through the hole in the strut tower.
  8. Free the sensor harness from the grommet holders and the clamps and pull it through the fender.

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Installation Procedure

  1. Install the front wheel speed sensor to the steering knuckle. Secure it with the bolt.

    2. Tighten
    Tighten the front wheel speed sensor bolt to 8 N•m (71 lb-in).


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  2. Feed the sensor harness into the engine compartment, insert it into the grommet, and secure the grommet into the hole in the strut tower.
  3. Secure the harness into the grommet holders and the clamps under the fender.
  4. Install the wheel. Refer to Section 2E, Tires and Wheels.
  5. Lower the vehicle.
  6. Connect the front wheel speed sensor electrical connector.
  7. Connect the negative battery cable.

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Front Wheel Speed Sensor Jumper Harness

(Left-Hand Drive Shown, Right-Hand Drive Similar)

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Disconnect connector from the EBCM.
  3. Remove the appropriate terminals from connector:

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  4. Both speed sensor harnesses break out of the ABS wiring harness just beyond the ABS connector. The right-side speed sensor harness crosses the top of the fire wall to the right-side fender area. The left-side speed sensor harness goes directly to the left-side fender area.
  5. Free the speed sensor harness from the wiring harness.
  6. Remove the front wheel speed sensor electrical connector from the retaining clamps and disconnect the harness from the sensor connector.

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Installation Procedure

  1. Install the front wheel speed sensor jumper harness.
  2. Connect the front wheel speed sensor electrical connector and secure it into the clamps.

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  3. Replace the jumper harness into the wiring harness.
  4. Insert the terminals into connector as they had been removed:
  5. Connect EBCM connector.
  6. Connect the negative battery cable.

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Rear Wheel Speed Sensor

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Raise and suitably support the vehicle.
  3. Disconnect the rear wheel speed sensor electrical connector.

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  4. Remove the rear hub unit from the knuckle assembly, because the wheel speed sensor is not serviceable separately.

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Installation Procedure

  1. Install the rear hub unit to the knuckle assembly.

    2. Tighten
    Tighten the rear hub unit to the knuckle assembly to 65 N•m (48 lb-ft).

  2. Connect the rear wheel speed sensor electrical connector.


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