1979 Manual Transmission Models

With ignition switch off, check for continuity between test connector terminals. See Fig 4. If continuity does not exist, replace throttle opener control solenoid.

Fig 1: Throttle Opener Control System Schematic (Typical)
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Turn ignition switch on and check voltage across the same terminals. Voltmeter should show battery voltage (12 volts). If not, check fuse and amplifier. Replace defective part.
NOTE: On 1979 models, test connector Is located on driver's side kick panel, above fuse/relay panel (next to hood release handle).
With ignition on, disconnect speedometer cable from instrument cluster. Spin the speedometer by hand and note voltmeter reading. Voltmeter should show 12 volts with speedometer below 10 MPH and then drop to zero (0) volts with speedometer above 10 MPH. If not, check amplifier and speed detecting switch. Replace defective part.

Fig 2: 1977 TOCS System Schematic (Man. Trans.)

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Fig 3: 1977 TOCS System Schematic (Auto. Trans.)

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Fig 4: 1979 Throttle Opener Control System Schematics

Courtesy of NISSAN NORTH AMERICA, INC.