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1.Gather information about
the problem from the customer.
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2.Verify that the condition
described by the customer exists.
| note |
If an error occurs in the SWS
communication line, the ECU isolated from the
communication line performs a fail-safe or
backup operation, so the problem may not match
the one shown in the Trouble Symptom Chart.
However, the cause of the failure can be tracked
down by performing the following troubleshooting
with the SWS monitor.
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3.Confirming version number
and destination
Check whether the SWS version number (3)
and destination (EU W/O DRL) meet the vehicle
specifications. If they are different, replace the ETACS-ECU
with a correct one.
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4.ECU check by using the SWS
monitor
Check whether the communication status of the
input- or output-signal-side ECU associated with the
defective function is normal.
- If "OK " is displayed for all related ECUs, they
communicate with each other normally and the input
or output signal circuit system may be defective.
Therefore, check SWS monitor service data.
- If "NG" is displayed for any of the related ECUs,
something may be wrong with the ECU for which "NG"
appears, its power supply or earthing system, or a
wiring harness or connector between the SWS monitor
and the ECU. Check the wiring harness and connectors
associated with the ECU and examine the ECU
itself.
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5.SWS monitor data
list
Select the defective function from the
function-specific diagnostic menu, and check the service
data that appears for each function item. This allows you to
check whether the transmission data is normal or not. You
can judge which circuit is the cause of the trouble, input
circuit or output circuit.
| note |
In addition to the
function-specific diagnostic menu, a service
data menu is available for SWS monitor service
data to check all items for each ECU.
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- The switch condition does not meet the service data
display: Input signal system related to defective
functions
- The switch condition meets the service data display:
Output signal system related to defective
functions
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6.Check of input signal
circuit system
Check relevant switch, sensor, input
signal-side ECU and their wiring harness and
connector.
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7.Check of output signal
circuit system
Check an output signal-side ECU,
electrical load components and their wiring harness and
connector.
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