219 ho tpc (gc_rp) 06-20-02
TRANSCRIPT
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Tire Pressure Monitoring (TPC)
319 HO 10 TPC (GC,RP) 06-20-02
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These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice.
Always check for revised or updated information.
To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer
to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair.Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US
version vehicles. Refer to the official introduction manual and WIS when available.
Copyright Mercedes-Benz USA, LLC, 2002
Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted
without written authorization from Mercedes-Benz USA, LLC or its successors.
Published by Mercedes-Benz USA, LLC
Printed in U. S.A.
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General Information TPC constantly monitors tire pressure
Pressure and temperature values are sent from the wheels to antennas
using radio frequency Antennas are connected directly to TPC module
Ambient temperature and fuel level are supplied via CAN-B
TPC module evaluates data and passes it on to the instrument cluster
module (ICM) via CAN-B
ICM display informs / warns driver of:
Sudden pressure loss
Pressure too low
TPC system failure
External interference
Low battery in sensor
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Advantages
Early warning when sudden pressure loss occurs
Avoid blowouts due to high speed / low pressure conditions
Driver is alerted to the need to check tire pressure
Pressure can be checked electronically
Tire wear reduced (-0.3 bar = 25% reduction in service life) Increased fuel mileage
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Survey of Pressure Checking Habits% Of passenger car drivers who check tire pressure:
Weekly 8.76 % When tires seem low 25.63 %
When serviced 30.18 %
Before long trip 0.99 % Other 6.46 %
Do not check 6.56 %
In a random check of 6442 cars stopping at gas stations:
36% had one or more tires that were at least 20% under-inflated.
26% had one or more tires that were at least 25% under-inflated.
(Source: NHTSA study)
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TPC Function-typical
(W220 video)
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Electronic Tire Pressure Check
Electronic check:
1. Call up the odometer display bypressing steering wheel buttons
(2)
2. Display tire pressure by pressing
steering wheel arrow buttons
(v)
Four values are displayed
In either barorpsi
Blanks indicate that no values
are stored
This is also the display youll see
after performing an activation to
store new pressure values
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Basic TPC Components
4 wheel sensors:
- Pressure
- Temperature
4 Antennas in
wheel housings
TPC module
CAN-B
Instrument Cluster
Module
- Readout values
- Display warnings- Vehicle speed
input
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Wheel Sensors and Antennas
Transmission intervals
New sensor inoperative until 1.5 bar applied for > 3 minutes
Normal conditions: Measure once every 3 seconds, transmit once every 55 seconds
When pressure drops >0.2 bar / minute: Measure and transmit once every 0.8 second
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Wheel Sensor Battery
Battery not replaceable
Battery life approximately 7
years
With each data transmission,
the sensor reports on remaining
battery life
DAS can be used to check
remaining battery life (inmonths)
Production date (july 15,1999)
stamped on sensor
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W211 TPC Module (N88)
At left side of trunk,
behind rear SAM
Task: Receive tire pressure and temperature info from wheel sensors.
Process info received via CAN-B and determine if tire pressures are OK.
T.30 Power and ground supplied by N10/2
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Additional Inputs to TPC
Front left SAM
- Ambient temp
- Charging volts
Rear SAM
- Fuel level
- Trunk lid status
Central gateway
- Country
- Vehicle specific info
EIS
- Ignition on
CAN-B
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Tire Service Stay clear of wheel sensor to
prevent damage
With tire removed, checkcondition of wheel sensor - no
need to remove sensor from
wheel to do this!
Before mounting tire, checkdate stamp on sensor
Replace sensor if over 5 years
old
43a Wheel weight43g Wheel sensor (~32 grams)
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Wheel Sensor Inspection White filter on underside of sensor
Dont remove it
No compressed air or detergents
Use a clean, lint-free cloth
Replace entire sensorif:
Damaged
Too dirty to clean
Tire sealant was used
Over 5 years old
Replace valve if: It has been removed
Screw or nut is loose
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Installing Wheel Sensor Always use new valve
315mhz must show on U.S. Sensor
Record electronic ID number of sensor
2.0mm hole in valve must face upward
Spacer has 45 bevel on both sides
When installing new sensor, use 2.0mm
pin (6) to counter hold valve (2) while
tightening lock nut (4)
Hollow screw and nut both torqued to
4nm
Electronic ID number
24
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Electronic Identification Number
Each sensor has a unique, wheel
electronic identification number thatit sends to the TPC module with
each data transmission
The TPC module must learn thisnumber and identify it with a specific
wheel position on the vehicle
The wheel electronic identification
number is stamped on the sensor
433MHz indicates European standard (US version = 315MHz)
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Activation NotesActivation means: Clearing old tire pressure specifications from TPC memory
Storing new tire pressure specification values for each wheel
Activation is performed when:
Setting a different inflation pressure base-line value
Cluster says to re-activate TPC
Tires are rotated
Winter tires are mounted
A wheel sensor has been replaced
The TPC control module has been replaced A TPC fault code has been erased
Activation isinitiated using steering wheel & ICM buttons and completed by driving
the vehicle
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Learning Wheel Sensor Location
Before new tire pressure specification values can be stored, the TPC module
must have learned the wheel sensor identification numbers and matched
those numbers with their specific location on the vehicle
The fastest way for the TPC module to learn this information is by entering it
into TPC memory using the DAS program. (Control unit adaptations >
settings)
Activation will occur faster if sensor locations are already known
The slower method of learning is to simply perform an activation. While
driving, first the wheel sensor locations will be learned and then the new
pressure specifications will be stored
TPC will have to determine sensor location by measuring field strength at
the antennas
TPC must receive a greater number of clear signals from each sensor
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TPC Activation Procedure
1. Vehicle stationary
2. Tire pressures set correctly
3. Engine OFF / Ignition ON4. Use steering wheel buttons (2) to scroll
to 0 mph display (S110s1)
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TPC Activation Procedure5. Use steering wheel buttons (/)
to display tire pressure screen
6. Tap the reset button (A1r1)
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TPC Activation Procedure
7. Press the + button (S111s1) on steering wheel to bring up the next display...
This will be the next screen:
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Activation now begins
TPC Activation Procedure
This screen indicates that previous
settings have been cleared
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After driving 10-30 minutes, display will suddenly show four actual
pressures. (Remember: 1 signal every 55 seconds)
System is then activated, with new values stored
If the values you are trying to set are implausible, cluster will display:
tire pressure / check tiretire pressure / check tire
TPC Activation Completed
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TPC Messages Are Displayed in ICM
Example shown: system
shut-down due to
outside interference
Function or operation
warnings are
displayed in white
Red warning display =
major loss of
pressure
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Function Warnings
Tire pressure monitor / Visit workshopTire pressure monitor / Visit workshop
CAN, component, sensor battery, DTC is stored
Tire pressure monitor temporarily inactiveTire pressure monitor temporarily inactive
During initialization, external interference, temp. >120C, additional
wheel sensors in vehicle
Tire pressure monitor activatedTire pressure monitor activated
During activation - pressures show after driving a few minutes
Tire pressure monitor / ReactivateTire pressure monitor / Reactivate
Pressure is 0.3 barabove stored value, or after replacing N88
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Operation Warnings
Tire pressure / check tireTire pressure / check tire
- Pressure in one or more tires dropped >0.2 bar (2.9 psi) below storedpressure. Message shows for 30 sec. After every start-up
- Pressure difference >0.4 bar (5.8 psi) between tires on same axle
- Pressures too low, temperature OK (
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Tire pressure LF / check tireTire pressure LF / check tire Pressure in one or more tires has dropped to 0.4 bar (5.8 psi) below the
stored pressure
Specific tire may not be indicated
Message displayed continuously
Operation Warnings Displayed in RED
Tire Pressure LF / Caution Tire DefectTire Pressure LF / Caution Tire Defect- Pressure loss >0.2 bar (2.9 psi) per minute
- Specific tire location indicated
- Stop immediately and install spare wheel / tire
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Service Tips
When an antenna or sensor problem is suspected, remount wheel to different
location, erase DTC and see if problem moves. This will eliminate antenna, wiring,
ECU, etc. Initializing first will make this faster.
When using wheels without pressure sensors, deactivate TPC using DAS (control
unit adaptations > read coding and change if necessary > monitoring function >
F2 > select not active, then transfer coding into control unit.)
When TPC is deactivated, client will get a white message, tire pressure control-
reactivateeach time engine is started.
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Acronyms used in this PresentationCAN Controller Area Network
DAS Diagnostic Assistance System
DTC Diagnostic Trouble Code
ECU Electronic Control Unit
EIS Electronic Ignition Switch
ICM Instrument Cluster Module
ID Identificationmph mils per hour
MHz Megahertz
NHTSA National Highway Transportation System Administration
PDI Pre-delivery Inspection
psi pounds per square inch
SAM Signal Acquisition Module
TPC Tire Pressure MonitoringVSS Vehicle Speed Signal
Ti P M it i (TPC)
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Tire Pressure Monitoring (TPC)
Group: 40.15
Control unit designation: N88
U.S. Introduction: MY2001
Major components: TPC module (N88)
Wheel sensors (A69/1-4)
Antennas (A2/44-47)
Related control modules: Driver-side SAM (N10/1)
Rear SAM (N10/2)
Central gateway (N93)EIS (N73)
Instrument cluster (A1)
CAN(s) used: CAN-B
Mils: noWarning messages in ICM? Yes
DTC capable? Yes
Control unit adaptation? Activation with driver controls
Requires control unit adaptation in: ICM
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Appendix
W211 Self-study material
Parts listed in group 54, electronic parts catalog RDK is the German acronym
MBUSA Technical Training website:
http://www.mbusatechtraining.com/home.asp > Information Access
Web site http://www-nrd.nhtsa.dot.gov/vrtc/ca/tpms.htm contains astudy of 10 monitoring systems. System E (the Beru system on a
BMW) is the one most like the MB system.
Another interesting article on the need for tire pressure monitoring:
http://www.nhtsa.gov/cars/rules/rulings/TirePressure/fedreg.htm The first part of the NTHSA ruling on TPM:
http://www.nhtsa.dot.gov/cars/rules/rulings/TirePresFinal/Index.html