Tire Monitoring System: Testing and Inspection

AH40.15-P-0001-01A Notes on using tester for tire pressure monitoring systems
- with CODE (475) Tire pressure monitor (Beru)
- with CODE (475) Tire pressure monitor (Siemens)
- with CODE (475) Tire pressure monitor (Schrader)

Component Identification:

Use
The following information can be read out of the tire pressure sensors using the tester MB 2000E (1):
^ System manufacturer (SIEMENS, BERU, SCHRADER)
^ Transmission frequency (DCX)
^ Identification number (IDENT NUMBER)
^ Tire inflation pressure (PRESSURE)
^ Air temperature in tire (TEMPERATURE)
^ Function of acceleration sensor (ACCEL), SIEMENS only
^ Tire pressure sensor status (MODE), SIEMENS and SCHRADER only
^ Battery status signal (BAT)

Component Identification:

Test prerequisites
Observe the following in order to prevent errors when reading out and evaluating the data:
^ Do not use the tester MB 2000E (1) at locations with high UHF radiation (e.g. in tire storerooms/warehouses, on vehicles parked close to other vehicles, stacked wheels). Minimum distance (x) to other tire pressure sensors: 2.0 meters
^ Position the tester MB 2000E (1) precisely: The upper face must be placed against the tire at the same level as the valve (2). Do not move from this position until the data is displayed.
^ New tire pressure sensors cannot be read out because they do not send signals until a tire inflation pressure above 3.2 bar has been applied.
^ Siemens tire pressure sensors must have the letters "DC", otherwise they will not be detected (NON DC-PART).
^ Whether or not the battery status signal (BAT) is transmitted can only be checked reliably if the air temperature inside the tire is above +10 degrees C.

The battery status and life cannot be checked using the tester MB 2000E (1)! This data must be readout from the tire pressure monitoring system control unit using STAR DIAGNOSIS!

Data evaluation
DCX:
315 -> Transmission frequency in MHz.
433 -> Transmission frequency in MHz.

IDENT
NUMBER: Identification number for coding the tire pressure sensor in the tire pressure monitoring system control unit.

PRESSURE: Tire inflation pressure.

TEMPERATURE: Air temperature in tire.

ACCEL:
PASS -> Acceleration sensor OK.
FAIL -> Acceleration sensor defective; replace tire pressure sensor.

MODE:
PARK or LRN LF -> Tire pressure sensor OK.
OFF or TEST -> Tire pressure sensor defective; replace tire pressure sensor.

BAT:
PASS -> Battery status signal available; OK.
LOW -> No battery status signal available; check tire pressure sensor using STAR DIAGNOSIS and replace if necessary.

Notes
^ To ensure that every tire pressure sensor can be detected, the option AUT must be selected under SETTINGS - TPMS IDENT in the MENU.
^ If no or implausible data is output, repeat the measurement; move to a different location if necessary.
^ The read-out procedure can be speeded up by reducing the tire inflation pressure by 0.3 bar.
^ Do not replace tire pressure sensors on the basis of the data from the tester MB 2000E (1); always carry out an analysis using STAR DIAGNOSIS before replacing components!