october2023 - 47

Figure 8 - CAN message arbitration
Photo from PicoScope
Tire pressure monitoring
* 02801:002 / Hard warning 1, lower limit not reached
(passive/sporadic)
Looking at the list above and correlating the results
might have one thinking that there is
a problem with the ABS control module
and the reason for this is that the
following list of modules is reporting
that the ABS control module isn't
doing its job:
* Engine
* Transmission
* Air conditioning
* Airbag
* Power steering
The first thing I observed while
looking at this diagram (Figure 6) is that
this network is isolated from the J1962
OBD-II diagnostic port. Secondarily,
I see that this vehicle has a Data Bus
Diagnostic Interface (J533) that serves as
a gateway between three different twowire
busses and a LIN bus and could
serve as a potential test point. The next
question I have is, 'How is termination
performed on this network?' I started
reading within service information (SI)
and found the following when searching
for " terminating resistor " (Figure 7).
What I found with this system is
that the engine controller possesses the
main terminating resistor while all the
other modules on the circuit have high
resistance (about 2.7k ohms) between
their high and low circuits. What this means is that there is
an overall 60-72 ohms of bus terminating resistance in this
circuit. If the ECM BUS connections had high resistance,
then my measurements would be much greater than this.
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Professional Distributor I October 2023 I VehicleServicePros.com 47
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october2023

Table of Contents for the Digital Edition of october2023

Editor's Note – The road to success at trade shows
Sneak Peek
Most Wanted
2023 PTEN People's Choice Award Winners
In Focus
Cover Story – Pinpointing the sale
Diagnostic Tech – Decoding automobile network communication challenges
Show Me Your Truck – Taking a leap of faith
Go Sell Something – Catching the prospect that got away
Driving Sales – Tire & Wheel Service
Tales from the Road – The tool bank
october2023 - 1
october2023 - 2
october2023 - 3
october2023 - Editor's Note – The road to success at trade shows
october2023 - 5
october2023 - Sneak Peek
october2023 - 7
october2023 - 8
october2023 - 9
october2023 - 10
october2023 - 11
october2023 - Most Wanted
october2023 - 13
october2023 - 2023 PTEN People's Choice Award Winners
october2023 - 15
october2023 - 16
october2023 - 17
october2023 - 18
october2023 - 19
october2023 - 20
october2023 - 21
october2023 - 22
october2023 - 23
october2023 - In Focus
october2023 - 25
october2023 - 26
october2023 - 27
october2023 - 28
october2023 - 29
october2023 - 30
october2023 - 31
october2023 - Cover Story – Pinpointing the sale
october2023 - 33
october2023 - 34
october2023 - 35
october2023 - 36
october2023 - 37
october2023 - 38
october2023 - 39
october2023 - Diagnostic Tech – Decoding automobile network communication challenges
october2023 - 41
october2023 - 42
october2023 - 43
october2023 - 44
october2023 - 45
october2023 - 46
october2023 - 47
october2023 - 48
october2023 - 49
october2023 - Show Me Your Truck – Taking a leap of faith
october2023 - 51
october2023 - Go Sell Something – Catching the prospect that got away
october2023 - 53
october2023 - Driving Sales – Tire & Wheel Service
october2023 - 55
october2023 - 56
october2023 - 57
october2023 - Tales from the Road – The tool bank
october2023 - 59
october2023 - 60
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https://www.nxtbook.com/endeavor/professionaldistributor/september2023
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https://www.nxtbook.com/endeavor/professionaldistributor/july2023
https://www.nxtbook.com/endeavor/professionaldistributor/2023scantoolspecguide
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https://www.nxtbook.com/endeavor/professionaldistributor/december2022
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https://www.nxtbook.com/endeavor/professionaldistributor/december2021
https://www.nxtbook.com/endeavor/professionaldistributor/october2021
https://www.nxtbook.com/endeavor/professionaldistributor/september2021
https://www.nxtbook.com/endeavor/professionaldistributor/august2021
https://www.nxtbook.com/endeavor/professionaldistributor/professional-distributor-july-2021
https://www.nxtbook.com/endeavor/professionaldistributor/june2021
https://www.nxtbook.com/endeavor/professionaldistributor/may2021
https://www.nxtbook.com/endeavor/professionaldistributor/professional_distributor_april_2021
https://www.nxtbook.com/endeavor/professionaldistributor/march2021
https://www.nxtbook.com/endeavor/professionaldistributor/february2021
https://www.nxtbook.com/endeavor/professionaldistributor/Diagnostic_Process_December_2020
https://www.nxtbook.com/endeavor/professionaldistributor/Professional_Distributor_December_2020
https://www.nxtbook.com/endeavor/professionaldistributor/october2020
https://www.nxtbook.com/endeavor/professionaldistributor/september2020
https://www.nxtbook.com/endeavor/professionaldistributor/collisionrepairsupplement-0820
https://www.nxtbook.com/endeavor/professionaldistributor/august2020
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https://www.nxtbook.com/endeavor/professionaldistributor/june2020
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https://www.nxtbook.com/endeavor/professionaldistributor/april2020
https://www.nxtbook.com/endeavor/professionaldistributor/march2020
https://www.nxtbook.com/endeavor/professionaldistributor/Hand_Tool_Supplement_0220
https://www.nxtbook.com/endeavor/professionaldistributor/february2020
https://www.nxtbook.com/endeavor/professionaldistributor/december2019
https://www.nxtbook.com/endeavor/professionaldistributor/heavydutydiagnosticsstudy2019
https://www.nxtbook.com/endeavor/professionaldistributor/october2019
https://www.nxtbook.com/endeavor/professionaldistributor/september2019
https://www.nxtbook.com/endeavor/professionaldistributor/august2019
https://www.nxtbook.com/endeavor/professionaldistributor/july2019
https://www.nxtbook.com/endeavor/professionaldistributor/june2019
https://www.nxtbook.com/endeavor/professionaldistributor/scantoolspecguide-june2019
https://www.nxtbook.com/endeavor/professionaldistributor/may2019
https://www.nxtbook.com/endeavor/professionaldistributor/april2019
https://www.nxtbook.com/endeavor/professionaldistributor/march2019
https://www.nxtbook.com/endeavor/professionaldistributor/february2019
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