PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Well Yes and No !! Common misconception nowadays, it does depend on the Topology of the Network and whether or not the car has a Communication Gateway. A wiring Diagram will tell you that.Pins 6 and 14 are supposed to be CAN C (high) and CAN B (low)
Hi.Jake Murphy wrote: ↑Tue Aug 27, 2019 2:03 amthe two traces are not close to being a typical CAN Bus pattern. I used the same set up, same settings on a Chevy Suburban with no problems.
Indeed yes. Or better still if the "Gateway" is accessible then what a great place to start. One place to look at all the Communication Networks in the car. Curve ball being that there could be more than one Gateway.The Powertrain CAN BUS may be measured directly on the connector of any Powertrain ECU
As per the factory shop manual, the above configuration is correct. No faults, just learning.Iver wrote: ↑Tue Aug 27, 2019 10:50 amWell Yes and No !! Common misconception nowadays, it does depend on the Topology of the Network and whether or not the car has a Communication Gateway. A wiring Diagram will tell you that.Pins 6 and 14 are supposed to be CAN C (high) and CAN B (low)
The days of seeing anything other than "Diagnostic" CAN at 6 & 14 are slowly going with the introduction of Gateways.
Measuring at 6 & 14 is no longer the right way to solve some CAN bus issues.
Are you experimenting or does this car have a fault ?
Try that same measurement again with your Scan tool plugged in, communicating with a controller reading Live Data
Thank you.vasek wrote: ↑Tue Aug 27, 2019 11:40 amHi.Jake Murphy wrote: ↑Tue Aug 27, 2019 2:03 amthe two traces are not close to being a typical CAN Bus pattern. I used the same set up, same settings on a Chevy Suburban with no problems.
There is a fundamental difference in the connection on the diagnostic connector DLC 16.
DLC 16 Chevrolet:
6 pin - high speed GM Lan BUS+
14 pin - high speed GM Lan BUS -
Powertrain CAN BUS , with constant data flow.
When the ignition is on,there is a constant exchange of data between the units.
DLC 16 Jeep (early production before 2008):
6 pin - CAN C+
14 pin - CAN C-
This CAN BUS is a diagnostic BUS from the Scanner to the ECU FCM (front control module with gate-way function)
The signal on this BUS will be only if there is a Scanner-FCM dialog
1 pin - CAN BUS+
13 pin - CAN BUS -
Powertrain CAN BUS , with constant data flow.
When the ignition is on ,there is a constant exchange of data between the units.
DLC 16 Jeep (after 2008):
6 pin - CAN C+
14 pin - CAN C-
This CAN BUS is a diagnostic BUS from the scanner to the ECU FCM (front control module with gate-way function)
The signal on this BUS will be only if there is a Scanner-FCM dialog
1 pin - not used
13 pin - not used
There is no Powertrain CAN BUS on the diagnostic connector.
The Powertrain CAN BUS may be measured directly on the connector of any Powertrain ECU.
All this is in the schematic diagrams (MOD).Jake Murphy wrote: ↑Tue Aug 27, 2019 2:21 pmWhat is the source of your information? Can you share a link?