Circuit Inspection

Total OBD & ECU Auto Diagnostics

Total OBD & ECU Auto Diagnostics

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A description of the main areas of each circuit inspection is shown in the table below.

Item

Description

Circuit Description

The major role, operation of the circuit and its component parts are explained.

Diagnostic Trouble Code No. and Detection Item

Indicates the diagnostic trouble codes, diagnostic trouble code settings and suspected areas for a problem

Item

Description

Wiring Diagram

This shows a wiring diagram of the circuit.

Use this diagram together with ELECTRICAL WIRING DIAGRAM to thoroughly understand the circuit.

Wire colors are indicated by an alphabetical code. B = Black, L = Blue, R = Red, BR = Brown, LG = Light Green, V = Violet, G = Green, O = Orange, W = White, GR = Gray, P = Pink, Y = Yellow, SB = Sky Blue The first letter indicates the basic wire color and the second letter indicates the color of the stripe.

Inspection Procedures

Use the inspection procedures to determine if the circuit is normal or abnormal. If abnormal, use the inspection procedures to determine whether the problem is located in the sensors, actuators, wire harnesses or ECU.

Indicates the condition of the connector of the ECU during the check

Connector being checked is connected.

Connections of tester are indicated by (+) or (-) after the terminal name.

Connector being checked is disconnected.

The inspections between a connector and body ground, information about the body ground is not shown in the illustration.

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