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1979 Federal Models (Exc. Pickup)

  1. Connect voltmeter to BCDD test connector terminals. See Fig 1. On manual transmission equipped models, go to next step. On automatic transmission equipped models, go to step  4).
    Fig 1: 1977-79 BCDD Control Circuit Schematics
    G09313085Courtesy of NISSAN NORTH AMERICA, INC.
    Fig 2: 1974 BCDD Control Circuit Schematics
    G09313086Courtesy of NISSAN NORTH AMERICA, INC.
  2. Block front wheels. Raise and support rear of vehicle so that drive wheels are free to turn. Start engine and measure voltage as vehicle is slowly accelerated.
  3. Control circuit is okay if voltmeter reads 12 volts with vehicle speed below 10 MPH and zero (0) volts with speed above 10 MPH. If not, check connectors, wiring, amplifier, speed detecting switch, or BCDD control solenoid (if equipped). Repair or replace as necessary.
  4. Turn ignition on and measure voltage in gear positions. Control circuit is okay if voltmeter reads 12 volts with selector lever in Park and Neutral and zero (0) volts in all other positions.
  5. On 200SX and 510 models, connect an ohmmeter to same test connector terminals and check resistance between terminals. See Fig 1. If resistance is 25 ohms or less, control circuit is okay.
  6. If voltage and ohm readings are not as specified, check connectors, wiring, inhibitor switch, and BCDD solenoid valve (if equipped). Repair or replace parts as necessary.