Land Rover Discovery: Power Steering Diagnosis and Testing - Inspection and Verification

PRINCIPLES OF OPERATION

For a detailed description of the Power Steering, refer to the relevant Description and Operation section in the workshop manual. REFER to: Power Steering (211-02 Power Steering, Description and Operation).

Inspection and verification

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable.

Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTES:

• If a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
• When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places.

  For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.

• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
• When diagnosing steering faults if issues are found to be due to interfacing system issues, e.g. anti-lock brake system, park aid, suspension, battery / charging system, etc, ensure warranty is claimed against the interfacing system where the problem is identified not steering gear.

1. Verify the customer concern
2. Visually inspect for obvious signs of damage and system integrity

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index
5. Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required

SYMPTOM CHART

Power Steering Diagnosis and TestingElectronic Power Steering Gear Inspection - With Heavy/ notchy Steering Gear

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