Steering System-General Information: Diagnosis Jaguar S-type I

Inspection and Verification

1. Verify the customer concern by driving the vehicle.
2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

VISUAL INSPECTION CHART

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
2. If the concern is not visually evident, verify the symptom and refer to «SYMPTOM CHART»(ref-199531-S02854025902005101900000) .

1. Verify the customer concern by driving the vehicle.
2. Visually inspect for obvious signs of mechanical or electrical damage. MECHANICAL CHECKS Mechanical Checks Incorrect tire pressure, loose wheel nuts, incorrect wheel alignment Loose tie-rods Loose damper and spring assemblies or ball joint Loose steering column shaft universal joints Loose pinch bolts on steering column shaft Loose steering gear assembly Check for external damage to the steering gear. Damaged tie-rods CAUTION: If a steering gear assembly is returned under warranty with leaking seals, but there is also damage to the steering gear boot/boots the steering gear warranty will be invalid. This is due to the steering gear seals being damaged due to foreign materials entering the steering gear boot and damaging the steering gear seals thereafter. Damaged steering gear boot Damaged accessory drive belt Binding or misaligned steering column, pump or steering gear Incorrect fluid level Hose leaks or line restrictions Hose fouling bodywork ELECTRICAL CHECKS Electrical Checks/Tests Make sure all connectors are in place (steering gear Servotronic solenoid and steering control module (SCM) - if applicable) Make sure all the fuses are in place and not blown DISCONNECT the steering gear transducer and the steering should become heavy TEST electrical values: Power Supply to the SCM = 12 Volts Steering gear transducer resistance 7.0 to 7.5 Ohms is normal Steering gear transducer voltage = 6 Volts Steering gear transducer current = 840 mA at 0 mph reducing to 0 mA at maximum speed RECONNECT all electrical items disturbed during testing
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. Check the power steering fluid condition. For additional information, REFER to «POWER STEERING FLUID CONDITION CHECK»(ref-199531-S00114178902005101900000) .
5. If the concern is not visually evident, verify the symptom and REFER to «STEERING FAULT DIAGNOSIS BY SYMPTOM CHARTS»(ref-199531-S31932484362005101900000) .

Scheme 7

Steering Linkage Inspection and Backlash (Freeplay) Check

Inspect the boots for cuts, deterioration, twisting or distortion. Check the steering gear boots to make sure they are tight. Install new boots or clamps as necessary.

Note. The following steps must be carried out with assistance.

1. With the wheels in the straight ahead position, gently turn the steering wheel to the left and the right to check for free play.
2. Free play should be between 0 and 6 mm (0 and 0.24 in) at the steering wheel rim. If the free play exceeds this limit, either the ball joints are worn, the lower steering column joints are worn or the backlash of the steering gear is excessive. CAUTION: DO NOT attempt to adjust the steering gear yoke. Failure to follow this instruction will result in the steering gear warranty to become invalid.
3. The backlash of the steering gear cannot be adjusted, install a new steering gear. For additional information, refer to «POWER STEERING»(ref-199532)
4. Grasp the steering wheel firmly and move it up and down and to the left and right without turning the wheel to check for column bearing wear, steering wheel or steering column. For additional information, refer to «STEERING COLUMN»(ref-199534)

Installing Test Equipment

To install the pressure test equipment

1. Place a suitable drain tray below the power steering pump.
2. Install a hose clamp on the reservoir to pump hose prior to disconnecting any hoses, to avoid unnecessary loss of fluid.
3. Disconnect the hose from the power steering pump high pressure outlet.
4. Install the pump outlet to hose adaptor (5). Do not omit the 'O' ring seal (9).
5. Connect the power steering pump adaptor to control valve hose (6) of the test equipment.
6. Install the adaptor (4) in the high pressure hose previously removed from the power steering pump outlet.
7. Connect the connector (3) of the test equipment hose (2) to the adaptor (4).
8. Remove the hose clamp from the reservoir hose.
9. Start the engine.

With the control valve (7) OPEN and the engine idling, the following system pressures may be checked

1. During turning.
2. When the steering is held on full lock.
3. With the steering at rest.

With the control valve (7) CLOSED the power steering pump maximum output pressure can be checked.

Removing Test Equipment

To remove the test equipment

1. Install a hose clamp on the reservoir to power steering pump hose.
2. Removing the test equipment is a reversal of the installation instructions.
3. Install a new 'O' ring seal (9) to the power steering pump high pressure outlet to hose connection.
4. Install the original hose to the power steering pump.
5. Remove the clamp from the reservoir to the power steering pump hose.
6. Top-up the reservoir fluid.
7. Bleed the power steering system. For additional information, refer to «POWER STEERING SYSTEM BLEEDING - VIN RANGE: L86902->M45254»(ref-199531-S30118775212005101900000) .