What components are shown in this engine and emission control system diagram?

It labels the air injection valve and pipe, idle compensator, temperature sensor, A.B. valve, spark plug, E.G.R. tube and E.G.R. control valve, T.O.C.S. solenoid and T.O.C.S. control valve, carburetor, T.V.V., anti-dieseling solenoid valve, throttle opener, canister (with a line from the fuel tank), vacuum motor, A.T.C. air cleaner, ignition coil, distributor, and the main and post mufflers.

What switch is used with a manual transmission versus an automatic in this system?

The diagram shows a speed detecting switch for manual transmission (M/T) vehicles and an inhibitor switch for automatic transmission (A/T) vehicles, both connected to the T.O.C.S. control valve circuit.

Where does the evaporative canister connect according to the diagram?

The canister is shown with a line labeled "From fuel tank" and connects into the carburetor/vacuum piping of the emission system.

What page and figure number is this diagram from?

The figure is identified as SEF323B and the page is marked EF & EC-3 (Engine Fuel & Emission Control section).

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Nissan Engine & Emission Control System Diagram - Vacuum Routing (EF & EC-3)

Engine and emission control system vacuum routing diagram with EGR, canister, and valves

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Engine and emission control vacuum routing diagram showing hose paths to EGR, canister, and control valves.

AI caption June 2005 · Photo 103 of 412

This document is a single page from a Nissan factory service manual, showing the "Engine and Emission Control System Diagram" (figure SEF323B, page EF & EC-3). It is a schematic side-view illustration of a carbureted engine and its complete emission control layout, with piping/vacuum routing drawn between components. Labeled components include the A.T.C. air cleaner with vacuum motor, air injection valve and air injection pipe, idle compensator, temperature sensor, A.B. (air breather/anti-backfire) valve, carburetor with anti-dieseling solenoid valve and throttle opener, T.V.V. (thermal vacuum valve), E.G.R. system (E.G.R. tube, E.G.R. control valve), T.O.C.S. solenoid and T.O.C.S. control valve, speed detecting switch (for manual transmission) and inhibitor switch (for automatic transmission), evaporative canister with a line marked "From fuel tank," ignition coil, distributor, spark plug, and the exhaust system's main muffler and post muffler. A reader can learn the identity and physical/vacuum interconnection of every major emission control device on this engine, making it useful for tracing vacuum hose routing, diagnosing EGR or air injection problems, and understanding how the throttle opener and T.O.C.S. system tie into transmission-type-specific switches.

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Frequently asked questions

What components are shown in this engine and emission control system diagram?: It labels the air injection valve and pipe, idle compensator, temperature sensor, A.B. valve, spark plug, E.G.R. tube and E.G.R. control valve, T.O.C.S. solenoid and T.O.C.S. control valve, carburetor, T.V.V., anti-dieseling solenoid valve, throttle opener, canister (with a line from the fuel tank), vacuum motor, A.T.C. air cleaner, ignition coil, distributor, and the main and post mufflers.
What switch is used with a manual transmission versus an automatic in this system?: The diagram shows a speed detecting switch for manual transmission (M/T) vehicles and an inhibitor switch for automatic transmission (A/T) vehicles, both connected to the T.O.C.S. control valve circuit.
Where does the evaporative canister connect according to the diagram?: The canister is shown with a line labeled "From fuel tank" and connects into the carburetor/vacuum piping of the emission system.
What page and figure number is this diagram from?: The figure is identified as SEF323B and the page is marked EF & EC-3 (Engine Fuel & Emission Control section).