Fitting instructions
Special tools and workshop equipment required
♦ Torque wrench
♦ Spray wax -D 322 000 A2-
Observe the legislative requirements for vehicles with Tyre Pressure Monitoring System from 01.11.2014 → Chapter.
Vehicles with tyre pressure sensor
If the wheels are changed (e.g. switch from summer to winter tyres), the wheel electronics transmit data as soon as the speed of the new wheels exceeds 25 km/h. The new wheel electronics' ID numbers are automatically detected and entered by the control unit.
The acceleration data are additionally checked against the vehicle speed. This process takes approx. 7 minutes.
The Tyre Pressure Monitoring System control unit -J502- must first switch to learning mode before it can automatically learn the wheel electronics.
To do this, the vehicle must remain stationary for 20 minutes. Following the detection of a flat tyre, this time is 5 minutes.
If the stationary time is not maintained and the control unit consequently does not switch to learning mode, the system detects interference in transmission and will learn the wheel electronics automatically only after a stationary period of 20 minutes.
Note
♦ When changing the wheels, note that only manufacturer-approved wheel and tyre combinations with the tyre inflation pressure specified in the tank flap may be installed.
♦ If unapproved wheel and tyre combinations are installed, a certificate from the responsible technical inspection authority must be available for the respective vehicle, and a second wheel set must be adapted via the → Vehicle diagnostic tester.
♦ An adaptation is also necessary if the tyre pressure deviates from the tyre pressure specified on the tank flap.
Tyre sets with other specified tyre inflation pressures
If a vehicle is fitted with tyres requiring nominal tyre inflation pressures other than those specified on the tank flap sticker, these tyres (second wheel set) can also be monitored with the TPM system.
Nominal tyre inflation pressures for the second wheel set must be specified to the system with the → Vehicle diagnostic tester.
The wheel electronics for the wheels of the second wheel set are not automatically detected and adapted by the TPM system (unlike the wheel electronics for the wheel set with wheel and tyre combinations approved by the vehicle manufacturer).
The following work has to be performed to switch to the second wheel set:
♦ Read ID numbers (IDs) of the wheel electronics (tyre pressure sensors) prior to installation.
♦ Switch the TPM to wheel set 2.
♦ Enter the necessary nominal tyre pressures and the IDs of the wheel electronics in the system.
Continued for all vehicles
Note
The width across flats of the provided wheel bolt adapter may differ from the width across flats of the adapter set.
– Switch off ignition.
NOTICE
Wheel bolts and wheels may become loose due to corrosion and contamination from oil or grease.
– Clean affected parts or sections of parts.
Note
On vehicles with Tyre Pressure Loss Indicator, the Tyre Pressure Loss Indicator has to be recalibrated any time one or more wheels are removed or fitted → Vehicle diagnostic tester.
– Check to ensure that contact surfaces -arrows- on brake disc are free of corrosion and dirt.
– Check to ensure that contact surface -arrow- on centring seat of wheel hub is free of corrosion and dirt.
– Check to ensure that contact surface -arrow- on inner side of wheel (rim) and also centring seat of rim are free of corrosion and dirt.
– The lug seats → Remark in the holes for the wheel bolts and the threads of the wheel bolts must also be free of corrosion as well as of soiling, oil and grease.
1) The lug seat is the curved surface of a section of a sphere cut by a plane.
– Check whether the wheel bolts can be easily screwed in by hand. The thread of the wheel bolts must not come into contact with the bore in the brake disc -arrow-.
● If the thread of the wheel bolt touches the hole -arrow-, the brake disc must be turned relative to the wheel hub.
Remove soiling and corrosion:
♦ Oil or grease from contact surfaces
♦ Oil or grease from threads in wheel hub
♦ Oil or grease from threads in wheel bolts
NOTICE
Damaged, badly corroded or stiff wheel bolts may become loose.
– Affected wheel bolts must be renewed.
Applies to alloy and steel wheels
When changing a wheel, wheel centring seat should be waxed using wax spray to prevent corrosion between wheel centring seat and rim → Electronic parts catalogue ETKA.
– Corrosion protection for wheel centring seat → Chapter.
– Fitting wheels → Chapter.
Protecting wheel centring seat against corrosion
Applies to alloy and steel wheels
When changing a wheel, wheel centring seat should be waxed using wax spray to prevent corrosion between wheel centring seat and rim → Electronic parts catalogue ETKA.
– Remove wheel.
– Thoroughly clean wheel centring seat on wheel hub and centring of rim.
– Apply wax with a brush in the area of centring ring -arrow-.
Ensure that only centring ring -arrow- but not contact surface of wheel rim has been waxed. Otherwise, the brakes will be soiled, which would reduce the braking efficiency.
NOTICE
Soiling of the brakes on a moving vehicle results in impaired braking efficiency.
– Only the centring ring of the rim should be waxed.
– Fit and tighten wheel → Running gear, axles, steering; Rep. gr.44; Wheels, tyres, Specified torque for wheel bolts.
Fitting wheels
– Preserving wheel centring seat → Chapter.
1 - When fitting the wheel, screw in all wheel bolts uniformly by hand.
2 - Tighten diagonally to 30 Nm.
3 - Lower vehicle onto floor. Tighten all wheel bolts diagonally to specified torque using torque wrench → Wheels, tyres; Rep. gr.44; Wheels, tyres; Specified torque for wheel bolts.
NOTICE
Wheel bolts tightened with an impact wrench may become loose.
– Screw in all wheel bolts uniformly by hand.
– Tighten wheel bolts in diagonal sequence to 30 Nm.
– Use torque wrench to tighten wheel bolts in diagonal sequence to specified torque.
Position of anti-theft wheel bolts for steel wheels
NOTICE
The wheel trim may become loose and get lost when the vehicle is moving.
– Make sure to install anti-theft wheel bolts at corresponding positions.
– Otherwise, it is impossible to ensure that the wheel trim is securely fitted and centred properly.
Steel wheels with 4 holes
On steel wheels, fit the anti-theft wheel bolt -arrow- only in hole located the farthest from valve -1-.
The hub cap on steel wheel can be securely mounted only if anti-theft wheel bolt is installed in this position.
Steel wheels with 5 holes
Anti-theft wheel bolts may be fitted to the immediate right or left -arrows- of valve -1- on steel wheels.
The hub cap on steel wheel can be securely mounted only if anti-theft wheel bolt is installed in this position.
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