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Check for corrosion or discolored pins on the tester and receptacle. Your tester could have bad connection internally causing it to “see” a low voltage from your vehicle. If you have a multimeter check for the correct voltage at the test receptacle. If that’s not where it should be, I would trace the wiring looking for a resistance (ie, corrosion or loose ...


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Make sure you have battery voltage on pin 16, and ground at 4. If you have voltage, probably have scanner problems.


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