General information on vehicle level measurement - AR40.00-P-0202A
MODEL 129, 140, 163, 168, 169, 170, 171, 197, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 216, 218, 219, 220, 221, 230, 245, 451
Checking For vehicle level measurement all the vehicle parts must be installed and the vehicle build must be completed ready to drive. 1 Check tire pressure, correct if necessary See tire inflation pressure chart inside the fuel filler flap. 2 Check condition of tires Visual inspection for wear pattern, tread depth and damage. 3 Check condition of rims Visual inspection for damage
All-season tires, disk wheel overview - GF40.10-P-1004MCU
MODEL 451.3 /4
| Vehicle/engine | Disk wheel | ET mm | Tires | Axle | Snow chains |
|---|---|---|---|---|---|
| 451.331 / 132.910 (52 kW) | 4.5 J x 15 H2 | 23,5 | 155/60 R 15 | 1 | |
| 5.5J x 15 H2 | 22 | 175/55 R 15 | 2 | ||
| 451.331 / 132.910 (52 kW) | 5 J x 15 H2 | 34 | 175/55 R 15 | 1 | |
| 6.5J x 15 H2 | 34,5 | 195/50 R 15 | 2 | ||
| 451.431 / 132.910 (52 kW) | 4.5 J x 15 H2 | 23,5 | 155/60 R 15 | 1 | |
| 5.5J x 15 H2 | 22 | 175/55 R 15 | 2 | ||
| 451.431 / 132.910 (52 kW) | 5 J x 15 H2 | 34 | 175/55 R 15 | 1 | |
| 6.5J x 15 H2 | 34,5 | 195/50 R 15 | 2 |
MODEL 451.3 /4
| Vehicle/engine | Disk wheel | ET mm | Tires | Axle | Snow chains |
|---|---|---|---|---|---|
| 451.331 / 132.910 (52 kW) | 4.5 J x 15 H2 | 23,5 | 155/60 R 15 | 1 | |
| 5.5J x 15 H2 | 22 | 175/55 R 15 | 2 | ||
| 451.331 / 132.910 (52 kW) | 5 J x 15 H2 | 34 | 175/55 R 15 | 1 | |
| 6.5J x 15 H2 | 34,5 | 195/50 R 15 | 2 | ||
| 451.431 / 132.910 (52 kW) | 4.5 J x 15 H2 | 23,5 | 155/60 R 15 | 1 | |
| 5.5J x 15 H2 | 22 | 175/55 R 15 | 2 | ||
| 451.431 / 132.910 (52 kW) | 5 J x 15 H2 | 34 | 175/55 R 15 | 1 | |
| 6.5J x 15 H2 | 34,5 | 195/50 R 15 | 2 |
Contents, function description, tire pressure monitor - GF40.15-P-0999MCU
MODEL 451.3 /4
Tire pressure monitor function GF40.15-P-0001MCU Tire pressure monitor (TPM [RDK]) location of components GF40.15-P-0001-06MCU Tire pressure monitor (TPM [RDK]) block diagram GF40.15-P-0001-07MCU Wiring diagram for tire pressure monitor control unit PE40.15-P-2101MCU Overview of system components for tire pressure monitor (TPM), component description GF40.15-P-9996MCU
Tire pressure monitor control unit, component description - GF40.15-P-5124MCU
MODEL 451.3 /4
Scheme 1
Location
The TPM [RDK] control unit is located in the footwell on the driver-side.
Task
The TPM [RDK] control unit realizes the following functions
- Tire pressure temperature compensation
- Warning for pressure loss
- Status monitoring
The TPM [RDK] control unit receives data telegrams via two-way radio from the following sensors
- Left front TPM [RDK] wheel sensor (A69/1)
- Right front TPM [RDK] wheel sensor (A69/2)
- Left rear tire pressure monitor sensor (A69/3)
- Rear right tire pressure control wheel sensor (A69/4)
The data telegrams contain the pressure, tire pressure temperature, individual serial number and status information (manufacturer, direction of rotation, operating mode etc.).
If a pressure loss is detected, the tire pressure monitor warning lamp (A1e66) in the instrument cluster (A1) is actuated by the TPM [RDK] control unit.
The TPM [RDK] control unit constantly monitors all input signals and output signals for faults. Detected faults that are relevant to function are entered into the fault memory.
Discrete inputs
- Circuit 30
- Circuit 31
CAN signals
The TPM [RDK] control unit is connected to the Control Area Network (databus/CAN Bus) (CAN) for data exchange.
Wheel sensor, component description - GF40.15-P-5126MCU
MODEL 451.3 /4
Scheme 2
Location
The wheel sensors are fastened securely inside the respective rim.
Task
The primary task of the TPM wheel sensors is to measure the pressure/temperature. The measuring range extends from p = 0 and 5.5 bar.
While driving the tire pressure sensors transmit six data messages every t = 60 s. Absolute pressure, tire pressure temperature, wheel identifier and status information (manufacturer, direction of turning, operating mode) are transmitted in these data messages. The TPM [RDK] control unit (N88) receives the data telegrams and assigns (after a learning phase) the wheel identifier to the wheels fitted to the vehicle.
As long as the TPM [RDK] control unit does not recognize the vehicle's own wheel identifier during initial commissioning, no fault message is displayed. After replacing a tire pressure sensor in each case the new tire pressure sensor is taught in and monitored with a new wheel identifier after driving for approx. t = 10 min.
Design
Each TPM wheel sensor is connected to the filling valve via a mounting bolt and forms an assembly unit with it. The assembly unit is attached to the rim flange using a counternut.
The complete assembly unit has to be changed
A wheel sensor consists of the following components
- Pressure sensor
- Temperature sensor
- High-frequency transmitter
- Sensor battery for power supply (service life approx. 10 years)
Overview of system components for tire pressure monitor (TPM), component description - GF40.15-P-9996MCU
MODEL 451.3 /4
| Instrument cluster, component description | A1 | GF54.30-P-6000MCU |
|---|---|---|
| Wheel sensor, component description | A69/1, A69/2, A69/3, A69/4 | GF40.15-P-5126MCU |
| Outside air temperature sender component description | B14 | GF83.57-P-4000MCC |
| Component description for the SAM control unit | N10/10 | GF54.21-P-4157MCU |
| Tire pressure monitor control unit, component description | N88 | GF40.15-P-5124MCU |
| Cockpit switch group, component description | S6/1 | GF54.25-P-4300MCU |
| Contents, function description, tire pressure monitor | GF40.15-P-0999MCU |