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1990 f-250 351W has a dlc but no sti wire. Is sti the white wire with a red trace on the dlc

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Which connector do I jump on STI & STO to find trouble codes?


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The headlamp circuit is rather simple. From the 15 amp RH headlamp fuse, there is a red w/yellow trace that goes to the RH high beam. Out of the 15 amp LH headlamp fuse, the wire going to the LH Hi beam is solid red. Both of these wires should have power when the headlamp relay is energized. The wires from the Hi Beam bulbs going back to the switch should both be red w/black trace. The wire going from the headlamp relay to power the 2 15 amp fuses is white. The headlamp switch applies a ground to illuminate either the Lo Beams or the Hi Beams.

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Red,black,green and white wires. what does what?


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However, there are literally dozens/hundreds of colors/schemes used in an automobile's electrical system, and the above can't be expected to hold. Best way to get info on the wires is with a circuit diagram or just by tracing/testing with a multi-meter.

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Pulling the trouble codes using a volt meter.


Self-Test with Analog Voltmeter DTCs will be represented by pulsing or sweeping movements of the voltmeter's needle across the dial face of the voltmeter (Figure 9). A single-digit number of three will be reported by three needle pulses (sweeps). However, a DTC is represented by a two-digit or three-digit number, such as 2-3. As a result, the DTC of 2-3 will appear on the voltmeter as two needle pulses (sweeps). After a two-second pause, the needle will pulse (sweep) three times.
The Continuous Memory DTCs are separated from the Key On Engine Off DTCs by a six-second delay, a single half-second sweep, and another six-second delay.

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.
17fa78e.gif 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).

Self-Test with Malfunction Indicator Lamp (MIL) During Self-Test, a DTC is reported by the Malfunction Indicator Lamp (MIL). It will flash the "CHECK ENGINE" or "SERVICE ENGINE SOON" light on the dash panel (Figure 10). A single-digit number of three will be reported by three flashes.
However, a DTC is represented by a two-digit or three-digit number, such as 2-3 or three digit. As a result, the Self-Test DTC of 2-3 will appear on the MIL as two flashes, then, after a two-second pause, the MIL will flash three times.
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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?


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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