Tire pressure monitor (TPM) messages relevant to operation - GF40.15-P-0001-05C
Models 215, 220 as of 1.9.02 up to 30.9.03 with code (475) tire pressure monitor
Messages relevant to operation in the multifunction display (A1p13) of the instrument cluster (A1) indicate to the driver, that the air pressure in at least one wheel has changed. The messages appear in yellow (information messages) or in red (warning messages).
Messages relevant to operation are stored in the TPM [RDK] control unit (N88) with an event code.
The messages relevant to operation describe a regular operating condition.
In the event of complaint there is no reason to exchange system components.
The following messages relevant to operation can occur:
Information message
If the air pressure in one or more wheels drops > 0.2 bar and not > 0.4 bar below the specified pressure adjusted by the driver and stored in the TPM [RDK] control unit (N88), this is shown in the multifunction display (A1p13) without specifying the position.
The information message appears for the first time in the next ignition sequence. The driver is therefore requested to check the tire inflation pressures and correct them if necessary and then reactivate the tire pressure monitor (TPM) system.
If the system is not reactivated, this information message appears repeated for approx. 30 seconds each time the engine is started and then goes out again.
Warning message
If a rapid pressure loss (> 0.2 bar/minute) is detected by the tire pressure monitor (TPM) system in a non-assigned wheel or in several wheels at the same time, this warning message is shown in the multifunction display (A1p13).
The driver is requested to stop the vehicle immediately and to check all the tires for any foreign bodies which may have penetrated. To make the vehicle safe to drive the spare wheel is to be fitted if necessary or TIREFIT tire repair kit used
The appropriate TPM wheel sensor (A69/1, A69/2, A69/3 or A69/4) is to be replaced after using TIREFIT.
Warning message (shown, as an example, for a pressure loss in the left front tire)
If a rapid pressure loss (> 0.2 bar/min) is detected by the tire pressure monitor (TPM) system in a wheel assigned to a position, the warning message opposite is shown in the multifunction display (A1p13).
The driver is requested to stop the vehicle immediately and to check all the tires for any foreign bodies which may have penetrated. To make the vehicle safe to drive the spare wheel is to be fitted if necessary or TIREFIT tire repair kit used
The appropriate TPM wheel sensor (A69/1, A69/2, A69/3 or A69/4) is to be replaced after using TIREFIT.
Warning message
If the air pressure in one or more tires drops >0.4 bar below the specified pressure adjusted by the driver and stored in the TPM control unit (N88), this is shown in the multifunction display (A1p13).
If the pressure loss is in only one wheel, this warning message is displayed as long as this is not yet assigned.
The driver is requested to stop the vehicle immediately and to check all the tires for any foreign bodies which may have penetrated. To make the vehicle safe to drive the spare wheel is to be fitted if necessary or TIREFIT tire repair kit used
The appropriate TPM wheel sensor (A69/1, A69/2, A69/3 or A69/4) is to be replaced after using TIREFIT.
This warning message is also displayed, if the TPM control unit (N88) refuses to perform an order to activate on the grounds of implausible pressure values.
Implausible pressure values:
- The tire inflation pressure adjusted by the driver is under the minimum pressure stored in the TPM [RDK] control unit (N88), a tire inflation pressure specific to a model series which must not be dropped below.
- The pressure difference of the tire inflation pressures on an axle is > 0.4 bar.
Remedy:
- Correct the tire inflation pressures and reactivate the tire pressure monitor (TPM) system.
On new vehicles the tire pressure monitor (TPM) is activated by the plant with an increased tire inflation pressure (approx. 3.5 bar). The TPM [RDK] control unit (N88) has stored these tire inflation pressures as specified pressures to be monitored.
By correcting the tire inflation pressure in the workshop this warning message is displayed in this ignition sequence.
The system must be reactivated.
Warning message (shown, as an example, for a pressure loss in the left front tire)
If the air pressure in a wheel assigned to a position drops > 0.4 bar below the specified pressure adjusted by the driver and stored in the TPM [RDK] control unit (N88), this is shown in the multifunction display (A1p13).
The driver is requested to stop the vehicle immediately and to check all the tires for any foreign bodies which may have penetrated. To make the vehicle safe to drive the spare wheel is to be fitted if necessary or TIREFIT tire repair kit used
The appropriate TPM wheel sensor (A69/1, A69/2, A69/3 or A69/4) is to be replaced after using TIREFIT.
System message after a previous warning message
If a red warning message was issued in the previous ignition sequence, the yellow system message opposite is displayed from the current ignition sequence and for the following sequences, as long as the system has not been reactivated.