HOW TO USE THE INSPECTION PROCEDURES
The causes of many of the problems occurring in electric
circuitry are generally the connectors, components, the ECU, the wiring
harnesses between connectors, in that order. These inspection procedures
follow this order. They first try to discover a problem with a connector
or a defective component.
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CURRENT TROUBLE
Indicates that
the status is "Active" and the trouble is currently present. Carry out
troubleshooting as described in the applicable inspection
procedure.
PAST
TROUBLE
Indicates that the status is "Stored" and the
trouble is historic. Since the trouble may still be present, set the
vehicle to the diagnosis code detection condition and check that the
status changes to "Active". If the status does not change from "Stored",
observe the applicable inspection procedure with particular emphasis on
connector(s) and wiring harness.
HARNESS CHECK
Check for an open or short
circuit in the harness between the terminals which are faulty according
to the connector measurements. Carry out this inspection while referring
to the Electrical Wiring Manual. Here,
"Check the wiring harness between the power supply and terminal xx" also
includes checking for blown fuse. For inspection service points when
there is a blown fuse, refer to "Inspection Service Points for a Blown
Fuse
."
MEASURES TO TAKE AFTER REPLACING THE ECU
If the
trouble symptoms have not disappeared even after replacing the ECU,
repeat the inspection procedure from the beginning.