Question about 1990 Ford F250

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1990 Ford F250-Code reader won't fit test plugs. Can't find a code reader that fits. Any info on which terminal is which, so I can use a multimeter?

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Using an Analog Volt/Ohm Meter (VOM)

  1. Turn the ignition key off.
  1. Set the VOM on a DC voltage range to read from 0 to 15 volts.
  1. Connect the VOM from the battery positive post to the Self-Test Output pin of the large Data Link Connector (DLC) (Figure 3).
  1. Connect the timing light.
Using the Malfunction Indicator Lamp (MIL) No special equipment hookup is required. STI is jumpered to SIG RTN at Self-Test Input (STI) connector and the Data Link Connector (DLC).


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Posted on Jan 01, 2009

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