How To Use Troubleshooting/ Inspection Service Points - Mitsubishi 3000GT Service Manual

GENERAL
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINT
Troubleshooting of electronic control systems for which the scan tool can be used follows the basic outline
described below. Furthermore, even in systems for which the scan tool cannot be used, part of these
systems still follow this outline.
TROUBLESHOOTING CONTENTS
1. STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
The main procedures for diagnostic troubleshooting are shown.
2. SYSTEM OPERATION AND SYMPTOM VERtFICATION TESTS
If verification of the trouble symptoms is difficult, procedures for checking operation and verifying
trouble symptoms are shown.
3. DIAGNOSTIC FUNCTION
The following diagnostic functions are shown.
Method of reading diagnostic trouble codes
Method of erasing diagnostic trouble codes
Input inspection service points
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES
4.
5. INSPECTION PROCEDURE FOR DIAGNOSTIC TROUBLE CODES
Indicates the inspection procedures corresponding to each diagnostic trouble code. (Refer to P.OO-9
6. INSPECTION CHART FOR TROUBLE SYMPTOMS
If there are trouble symptoms, even though the results of inspection using the scan tool show that
all diagnostic trouble codes are normal, inspection procedures for each trouble symptom will be found
by means of this chart.
INSPECTION PROCEDURE FOR DIAGNOSTIC SYMPTOM
Indicates the inspection procedures corresponding to each trouble symptoms classified in the Inspection
Chart for Trouble Symptoms. (Refer to P.OO-9 - how to use the inspection procedures.)
SERVICE DATA REFERENCE TABLE
Inspection items and normal judgement values have been provided in this chart as reference information.
CHECK AT ECU TERMINALS
Terminal numbers for the ECU connectors, inspectl~n itemsandstandard values have been provided
in this chart as reference information.
Terminal Voltage Checks
1. Connect a needle-nosed wire probe or paper clip to a voltmeter probe.
2. Insert the needle-nosed wire probe into each of the ECU connector terminals from the wire side,
and measure the voltage while referring to the check chart.
NOTE
1. Measure voltage with the ECU connectors connected.
2. You may find it convenient to pull out the ECU to make it easier to reach the connector
terminals.
3. Checks don't have to be carried out in the order given in the chart.
Caution
Short-circuiting the positive (+) probe between a connector terminal and ground could damage
the vehicle wiring, the sensor, the ECU, or all three.
Use care to prevent this!
3. If voltage readings differ from Normal Condition values, check related sensors, actuators, and
wiring, then replace or repair.
4. After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected
the problem.
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