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What makes a code reader not work?

Updated: 12/14/2022
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16y ago

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If it is OBD II, no serial data, it may be VCM, Power Steering control Module, other Modules, open in harness, or many other possibilities. If it is OBD I, I would jump the PIP and trigger codes using a volt meter or a test light and see if that works. Bury the accelerator pedal while PIP is jumpered and it should run solenoid tests as well showing some communication. Or bad code reader.

i've seen bad b+ (battery positive) at the DLC(data link connector 16 pin obd2) cause failed communication w/ ngs/star and wds

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