1995 TOYOTA SUPRA Service Repair Manual

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Page 1193 of 2543

TOYOTA SUPRA 1995 Service Repair Manual [4] DIAGNOSTIC TROUBLE CODE CHART
The inspection procedure is shown in the table below. This table permits efficient and accurate troubleshooting
using the diagnostic trouble codes displayed in the d

Page 1194 of 2543

TOYOTA SUPRA 1995 Service Repair Manual [5] MATRIX CHART OF PROBLEM SYMPTOMS
The suspect circuits or parts for each problem symptom are shown in the table below. Use this table to trouble-
shoot the problem when a ºNormalº code is display

Page 1195 of 2543

TOYOTA SUPRA 1995 Service Repair Manual IN±28± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

Page 1196 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMSIN±29

Page 1197 of 2543

TOYOTA SUPRA 1995 Service Repair Manual HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION
PROCEDURE
1. For troubleshooting, diagnostic trouble code charts or problem symptom charts are provided for each
circuit with detailed inspection proced

HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION
PROCEDURE
1. For troubleshooting, diagnostic trouble code charts or problem symptom charts are provided for each
circuit with detailed inspection procedures on the following pages.
2. When all the component parts, wire harnesses and connectors of each circuit except the ECU are found
to be normal in troubleshooting, then it is determined that the problem is in the ECU.
Accordingly, if diagnosis is performed without the problem symptoms occurring, the instruction will be to
check and replace the ECU, even if the problem is not in the ECU. So, always confirm that the problem
symptoms are occurring, or proceed with inspection while using the symptom simulation method.
3. The instructions ºCheck wire harness and connectorº and ºCheck and replace ECUº which appear in the
inspection procedure, are common and applicable to all diagnostic trouble codes. Follow the procedure
outlined below whenever these instructions appear.
Check Wire Harness and Connector
The problem in the wire harness or connector is an open circuit or a short circuit.
OPEN CIRCUIT:
This could be due to a disconnected wire harness, faulty contact in the connector, a connector terminal pulled
out, etc.
HINT:
1. It is rarely the case that a wire is broken in the middle of it. Most cases occur at the connector. In particular,
carefully check the connectors of sensors and actuators.
2. Faulty contact could be due to rusting of the connector terminals, to foreign materials entering terminals
or a drop in the contact pressure between the male and female terminals of the connector. Simply
disconnecting and reconnecting the connectors once changes the condition of the connection and may
result in a return to normal operation.
Therefore, in troubleshooting, if no abnormality is found in the wire harness and connector check, but the
problem disappears after the check, then the cause is considered to be in the wire harness or connectors.
SHORT CIRCUIT:
This could be due to a short circuit between the wire harness and the body ground or to a short inside the switch,
etc.
HINT:
wWhen there is a short between the wire harness and body ground, check thoroughly whether the wire
harness is caught in the body or is clamped properly. IN±30
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

Page 1198 of 2543

TOYOTA SUPRA 1995 Service Repair Manual 1. CONTINUITY CHECK (OPEN CIRCUIT CHECK)
(1) Disconnect the connectors at both ECU and sensor sides.
(2) Measure the resistance between the applicable terminals of
the connectors.
Resistance: 1 o

Page 1199 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Actual examples of the inspection method for open circuit and short circuit are explained below.
1. OPEN CIRCUIT CHECK
For the open circuit in the wire harness in Fig. 1, perform º(a) Continuity Che

Page 1200 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (b) Voltage Check
In a circuit in which voltage is applied (to the ECU connector terminal), an open circuit can be checked for
by conducting a voltage check.
(1) As shown in Fig. 4, with each conn

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