How do I test the T.O.C.S. solenoid valve?

Check for continuity between the "G/R" and "B" terminals in the function check connector with the ignition switch OFF. If continuity does not exist, the solenoid may be faulty and the throttle opener control valve assembly should be replaced.

What voltage should the T.O.C.S. terminals show on M/T models?

When the speedometer indicates above 10 km/h (6 MPH), voltage between "G/R" and "B" should be 12V; below 10 km/h (6 MPH) it should be 0V. If not, the amplifier or speed detecting switch may be faulty.

What voltage should A/T models show at the T.O.C.S. terminals?

0V in the "N" or "P" position and 12V in other positions. If not, replace the inhibitor switch.

What is the specified engine idling speed?

M/T: 700±50 rpm; A/T: 700±50 rpm in the "D" position.

What type of gauge should be used to check throttle opener operating pressure?

A quick-response type boost gauge such as Bourdon's type is recommended; a mercury-type manometer should not be used.

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Nissan Throttle Opener Control System (T.O.C.S.) Inspection & Adjustment

T.O.C.S. entire-system inspection with solenoid voltage and idle specs, Nissan EF & EC

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TOCS inspection: check continuity then 12V/0V at G/R and B terminals; set engine idle M/T 700+/-50 rpm, A/T 700+/-50 rpm in D before checking opener pressure.

AI caption June 2005 · Photo 129 of 412

This service manual page covers inspection and adjustment of the Throttle Opener Control System (T.O.C.S.), part of the exhaust emission control system. It explains that when idle speed stays too high, the system should be checked by testing continuity between the "G/R" and "B" terminals of the function check connector with the ignition off (no continuity indicates a faulty solenoid, requiring replacement of the throttle opener control valve assembly), then checking voltage with the ignition on. For M/T models, spinning the speedometer above 10 km/h (6 MPH) should show 12V; below 10 km/h, 0V — otherwise the amplifier or speed detecting switch is faulty. For A/T models, voltage should be 0V in "N" or "P" and 12V in other positions; if not, the inhibitor switch should be replaced. A second section, Throttle Opener Operating Pressure, describes removing the solenoid valve harness, connecting a vacuum gauge (a quick-response Bourdon-type boost gauge, not a mercury manometer) to the intake manifold, warming the engine to operating temperature, confirming idle speed of 700±50 rpm (M/T, and A/T in "D"), then raising engine speed to 3,000–3,500 rpm and quickly closing the throttle. Two illustrations (SEC252A, SEC253A) show the solenoid valve and T.O.C.S. control valve locations.

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Frequently asked questions

How do I test the T.O.C.S. solenoid valve?: Check for continuity between the "G/R" and "B" terminals in the function check connector with the ignition switch OFF. If continuity does not exist, the solenoid may be faulty and the throttle opener control valve assembly should be replaced.
What voltage should the T.O.C.S. terminals show on M/T models?: When the speedometer indicates above 10 km/h (6 MPH), voltage between "G/R" and "B" should be 12V; below 10 km/h (6 MPH) it should be 0V. If not, the amplifier or speed detecting switch may be faulty.
What voltage should A/T models show at the T.O.C.S. terminals?: 0V in the "N" or "P" position and 12V in other positions. If not, replace the inhibitor switch.
What is the specified engine idling speed?: M/T: 700±50 rpm; A/T: 700±50 rpm in the "D" position.
What type of gauge should be used to check throttle opener operating pressure?: A quick-response type boost gauge such as Bourdon's type is recommended; a mercury-type manometer should not be used.