Interpreting parameters

PR003 PR004 PR005 PR006

FRONT LEFT WHEEL PRESSURE FRONT RIGHT WHEEL PRESSURE REAR RIGHT WHEEL PRESSURE REAR LEFT WHEEL PRESSURE

INSTRUCTIONS

No fault must be present.

Perform this diagnosis after noticing an inconsistency in the display of these parameters.

After communication is established, these parameters display a default value (0 bar). Make each valve transmit (by creating a leak or by a road test) to read the pressures actually measured by the sensors at the time of diagnosis.

In all cases, check whether the pressures displayed by the diagnostic tool match those read with the pressure gauge (within 0.2 bar).

If the pressures differ, two cases may occur. Case 1: the parameters always display 0 bar. This means the codes of the valves fitted to the wheels do not match the wheel set learned by the passenger compartment central unit. (When the central unit receives the code of each valve, it does not recognise them because they do not match the wheel-set codes it has learned, i.e. the codes it expects.) To fix this: perform a learning procedure using command SC002 'Learning the codes of the four valves', described in the 'Configurations and learning' section of this sub-chapter.

Case 2: parameters PR003 to PR006 display incorrect values (other than 0 bar). If the pressures differ, this indicates valve drift. Replace the faulty valve. Follow the learning procedure: SC002 'Learning the codes of the four valves', described in the 'Configurations and learning' section of this sub-chapter.

After learning, restart this diagnosis from the beginning.

AFTER REPAIR

Restart the check from the beginning.

PR009 PR010 PR011 PR012

RECOMMENDED LOW-SPEED PRESSURE FRONT AXLE RECOMMENDED LOW-SPEED PRESSURE REAR AXLE RECOMMENDED HIGH-SPEED PRESSURE REAR AXLE RECOMMENDED HIGH-SPEED PRESSURE FRONT AXLE

INSTRUCTIONS

No fault must be present or stored.

Perform this diagnosis after finding a discrepancy between the manufacturer's recommended pressures and those stored in the passenger compartment central unit.

Caution: use Repair Manual 364 or refer to the pressure label affixed to the driver's door, and note the recommended pressures for the tyres actually fitted to the vehicle.

If, after comparison with manufacturer data (see Repair Manual 364, chapter 35A), the recommended pressures stored in the passenger compartment central unit do not match, reprogram them using command 'VP005 Entering recommended pressures', described in the 'Configurations and learning' section of this sub-chapter.

If the recommended pressures cannot be entered correctly, contact your Techline.

AFTER REPAIR

Restart the check from the beginning.