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OBD II 299

5.0 DISPLAYING DATA FOR MULTIPLE

ECUS

In some vehicles OBD II information is sent to the Tester by more than one ECU. For

example, a vehicle may have both an engine controller and a transmission controller

which can provide emissions-related diagnostic data.

When the Tester initiates communication with an OBD II vehicle, it determines which

ECUs are available on the vehicle. If more than one OBD II ECU is present, the Tester

displays a message indicating the IDs for each ECU along with the type of ECU (e.g.,

engine or transmission).

In most of the OBD II test modes, when more than one ECU is communicating, select the

ECU for which you want to examine data. This selection is provided for the following

modes:

•DATA LIST

•DTCs

• FREEZE DATA

• SNAPSHOT

• READINESS TESTS

• ON-BOARD TESTS

For DTCs, Freeze Data, and Readiness Tests, this selection determines which ECU's data

is displayed.

For <DATA LIST> and <SNAPSHOT> modes, the Tester displays a composite list of data

received from all ECUs. Selecting an ECU before entering the mode determines which

ECU's data is displayed first for parameters that are reported by more than one ECU.

Pressing AH displays information about the highlighted parameter, including

which ECU reported it. If more than one ECU reported a parameter, you can change the

ECU data displayed by pressing Ae. This allows you to compare the data

reported by two or more ECUs. The Ae only affects the display for the

highlighted parameter. The total list of parameters is a composite of parameters reported

by all ECUs. It is possible to have a mix of parameters, some of which are reported only

by the engine controller, some reported only by the transmission controller and some

reported by both. You can verify the reporting ECU by pressing AH.

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SEKURE SX-3100LCD Instrukcja Operatora Strona 311