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Code 18 - VOS Control Solenoid System Test

  1. Connect diagnostic readout box to engine harness connector. With carburetor switch open and ignition switch in "RUN" position, place read/hold switch in "HOLD" position. Wait for Code 55 to appear on display of readout box.
  2. Connect voltmeter to Black wire of carburetor 6-wire connector and ground. Press and hold ATM button until test code 98 appears on display. If voltmeter reading is pulsating and solenoid is clicking, check for poor connection in harness circuit.
  3. If voltmeter is not pulsating buts reads within 1 volt of battery voltage, go to step 4). If voltmeter is not pulsating but reads 0-1 volt, disconnect computer 14-wire connector. If voltage is now within 1 volt of battery, replace computer. If not, go to step 5).
  4. Turn ignition switch off. Disconnect computer 14-wire connector. Connect voltmeter to cavity No. 8 of 14-wire connector and ground. Turn ignition to "RUN" position. If voltmeter reads within 1 volt of battery voltage, replace computer. If not, inspect wire from cavity No. 8 to VOS control solenoid for open and repair as needed.
  5. With carburetor 6-wire connector disconnected, connect a voltmeter to Blue wire of harness 6-wire connector and ground. Turn ignition switch to "RUN" position. If voltmeter reads within 1 volt of battery voltage, inspect Black/White wire from VOS solenoid to computer for short circuit to ground and repair as needed. If zero volts, check Blue wire for open circuit to ignition switch.
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