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Test Procedure and Instructions for Shuttle Valve Switches

Order your replacement shuttle valve switch today.

shuttle valve switch Land Rover Discovery Series II

Applies To:

Discovery Series II | '99-'04

ABS Module Valve Kit - Part # SWO500030



NOTE: Wiring faults may be intermittent due to hidden breaks and poor connections. Also, before completing this check, start by looking for common faults with your shuttle valve or ABS sensor. See this Tech Tip for more information.

NOTE: If a fault is confirmed and a rectification carried out, the step/rectification must be retested and then the remainder of the diagnostic procedure should be completed.

1. Position the ignition to the OFF position and perform the following:

ABS Module Valve Kit

2. Disconnect and check the 13-pin connector at the ABS modulator (C0501). (Figure 3 below)

3. Disconnect the 15-pin connector C0506 at the Self Leveling and Anti-lock Braking (SLABS) ECU. (Figure 4 below)

4. Inspect both connectors for moisture ingress or corrosion and correct as follows:

5. With connectors C0501 and C0506 disconnected perform the following:

6. Disconnect the 18-pin SLABS ECU connector (C0504).

7. Check for continuity between pin-12 of C0504 and the ground connection located under the left-hand side of the fascia (C0362 - black wire). (Figure 5 below)

ABS Module Valve Kit

8. If there is no continuity (or intermittent continuity when the wire is flexed), repair as necessary and ensure the wire is correctly crimped and soldered.

9. Connect the connectors to the SLABS ECU and ABS Modulator.

10. If repairs were completed, clear all logged codes using T4 and perform the following:


CAUTION: The safety precautions detailed in the Workshop Manual relating to braking systems must be adhered to.

NOTE: Discovery Series II 1999MY onwards Workshop Manual Section 70, Brakes - Modulator unit - ABS (70.65.49)

1. If no wiring concerns were found during the continuity checks, refer to GTR section 70.65.49 and remove the ABS modulator from the vehicle.

2. Place the ABS modulator on clean work surface and check for continuity between pin 8 of the 13-pin modulator connector (C0501-8) and the single adjacent modulator ground pin (C0500-1). (Figure 6 below).

3. If there is no continuity in the test above, obtain a new ABS modulator and go to the INSTALLATION AND FINAL VERIFICATION section.

CAUTION: This procedure should be carried out in a clean working environment.

NOTE: There may be a slight covering of brake fluid behind the black plastic cover when removed. This is normal and is not a cause for concern. The shuttle valve switches are located behind the black plastic cover opposite the hydraulic ports.

4. If there is continuity in the test above in step 2, remove the plastic cover from the modulator as follows: (Figure 7 below)

ABS Module Valve Kit

CAUTION: The black plastic cover must be secure and may not be cracked when installed.

5. Install the new shuttle valve switch pack from the service kit as follows:

6. Measure the resistance between pin 9 on the 13-pin modulator connector (C0501-9) and the single adjacent modulator ground pin (C0500-1).

7. If the resistance value observed is outside the 3020 Ohms ±30 Ohms limit, obtain a new ABS modulator and go to the INSTALLATION AND FINAL VERIFICATION section.


1. Refer to GTR Section 70.65.49 and install the ABS modulator from the vehicle or the new unit if testing indicated replacement was required.

2. Clear any logged DTCs using T4 and disconnect the diagnostic equipment from the vehicle.

3. Road test the vehicle including a number of drive cycles to verify that none of the SVS DTCs return and include the following elements in the road test:

4. Connect T4 and verify that no SVS DTCs have returned.

5. Verify that the Internal ECU Data Shuttle Valve Switch Failure Count (0DH LSB) is zero.

6. If the failure count is not zero or if any SVS DTCs have returned, replace the ABS modulator with a new unit.

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