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Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition

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Tools & equipment<br />

Diode checking - Fig. 11 & Fig. 12<br />

--<br />

Set the meter to RESISTANCE or DIODE.<br />

Connect the red test lead to positive terminal of the diode.<br />

Connect the black test lead to the neqative terminal of the diode<br />

The meter should display continuity fig. 11 .<br />

Reverse the test leads, the meter should display NO continuity Fig. 12.<br />

NOTE: If the meter displays continuity in both tests the diode is faulty.<br />

Fig. 11<br />

Fig. 12<br />

Continuity through diode<br />

No continuity through diode<br />

Fig. 13<br />

Signal checking with LED tester - ~lg. 13<br />

Checking sensor signal wlth LED tester -<br />

multi-plug connected<br />

CAUTION: Circuit testers incorporating a bulb<br />

should not be used on electronic<br />

circuits as the high current involved<br />

could damage sensitive components.<br />

LED testers can be used safely on electronic<br />

circuits as their low current consumption cannot<br />

damage electronic components.<br />

They are particularly useful where a pulse or<br />

intermittent signal is being checked.<br />

Most LED testers are in the form of a probe<br />

attached to the tester body, with a test lead <strong>and</strong><br />

clip for the other terminal. The more<br />

sophisticated testers have different coloured<br />

LEDs to indicate polarity.

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