PERIODIC MAINTENANCE 2-29
Example of trouble
Three data; value 1 (current data 1), value 2 (past data 2) and value 3 (past data 3); can be made in compar-
ison by showing them in the graph. Read the change of value by comparing the current data to the past data
that have been saved under the same condition, then you may determine how changes have occurred with
the pass of time and identify what problem is currently occurring.
With DTC not output, if the value of engine coolant temperature is found to be higher than the data saved
previously, the possible cause may probably lie in a sensor circuit opened or ground circuit opened or influ-
ence of internal resistance value changes, etc.
Abnormal curve of graph
No DTC output
Unstable idling speed
Abnormal value of engine temperature
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