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1975-76 Models

  1. Make sure wiring and vacuum hoses are properly connected and that distributor is working properly. Connect timing light to engine. Start engine and increase speed to 1600 RPM on B210 and F10, 1800 RPM on 610 and 710, or 3200-3500 RPM on 280Z. Check and note ignition timing.
  2. On B210, 610 and 710, disengage clutch and place transmission in high gear, 3rd gear, and Neutral. System is operating correctly if timing advances 5 degrees or more in high gear and Neutral.
  3. On 1976 F10, disengage clutch and place transmission in high gear and all other forward gears while checking ignition timing in each gear. System is operating properly if timing is 10-15 degrees greater in high gear than in other gear positions.
  4. On 280Z, disengage clutch and place transmission in Neutral and high gear. System is operating properly if timing is 5 degrees greater in high gear than in Neutral position.
    Fig 1: 7976-78 F10 TCS Electrical Circuit
    G09313137Courtesy of NISSAN NORTH AMERICA, INC.
  5. If timing does not vary as indicated on 1976 F10, turn ignition off and check continuity between terminals "B" and "C". See Fig 1. If continuity does not exist, check fuse wiring, and vacuum switching valve. Turn ignition on and check voltage across terminals "A" and "B". Reading should be zero (0) volts in high gear an Neutral, 12 volts in all other gear positions.
  6. If timing does not vary as indicated on all other models, disconnect vacuum switching valve wire (White on 280Z, Green on all others). Repeat ignition timing advance procedure.
  7. Connect vacuum switching valve wire directly to battery positive terminal and recheck timing. Timing should change 5 degrees when wire is disconnected from battery. If not, replace high gear detecting switch. If timing does not change through entire test procedure, replace vacuum switching valve.
  8. Turn ignition on and check voltage across terminals "A" and "B". See Fig 2 and Fig 3. On B210, 610 and 710, reading should be zero (0) volts in high gear an Neutral, 12 volts in 3rd gear positions. On 280Z, reading should be zero (0) volts in high gear, 12 volts in all other gear positions.
    Fig 2: 1975-78 B210, 610 & 710 TCS Electrical Circuit
    G09313138Courtesy of NISSAN NORTH AMERICA, INC.
    Fig 3: 1975-76 2601 TCS Electrical Circuit
    G09313139Courtesy of NISSAN NORTH AMERICA, INC.
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