What does the red line indicate in this Jaguar XJ6 diagram?

Red indicates the Series III OE (original equipment) installation, per the notes and the legend ("= SIII OE").

When does the electric purge valve on the charcoal canister open?

The electric purge valve opens with power, and the canister's vacuum valve opens the purging path into the throttle neck on open throttle, provided the electric purge valve is opened along with the airpump valve.

How does the airpump operate on cold starts?

The airpump delivers output to the exhaust ports when its electric valve is opened on cold starts, but uses vacuum to control the valve during that time — high vacuum means less air is needed.

What does the differential 2-way valve do?

It maintains a small tank pressure, with easy airflow and a small spigot to the tank vents.

Where should the distributor hose go if not using the distributor vacuum regulator?

It should be brought to the upstream-of-throttle spigot, as noted next to the throttle body: "bring Dist hose here if not using Dist Vac Regulator."

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Jaguar XJ6 Series II & III EFI Charcoal Canister & Crankcase Vent Vacuum Diagram

Jaguar XJ6 SII/SIII EFI charcoal canister and crankcase ventilation vacuum diagram

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Vacuum routing diagram for the Jaguar XJ6 SII & SIII EFI evaporative-canister purge and crankcase-ventilation system: charcoal canister, electric purge valve, AAV anti-airpump valve, distributor vacuum regulator, exhaust air-injection rail.

AI caption May 2010 · Photo 9 of 34

This is a hand-drawn schematic diagram titled "XJ6 SII & SIII EFI Canister & Crankcase Ventilation Diagram," dated 1/26/07, covering the Jaguar XJ6 Series II and Series III EFI evaporative emissions and crankcase ventilation systems. It illustrates the devices, pipes, and hoses related to charcoal-canister vapor purge, the extra-air valve (AAV), airpump output, and crankcase ventilation. Red lines indicate the Series III original equipment (OE) installation, and the notes state that the vacuum regulator can also be fitted to a Series II. Components shown include the differential 2-way valve (which maintains small tank pressure), tank vents, the charcoal canister with a vacuum-operated valve and an electric purge valve (opens with power), the distributor vacuum regulator, the AAV, air block and idle screw, the throttle body ("Carb"), the exhaust air-injection rail on the cylinder head, the crankcase vent with screen and filter, a flow restrictor, and the airpump with connections to the intake manifold. Explanatory text describes airpump operation on cold starts (electric valve opened, vacuum-modulated) and the canister purging path into the throttle neck on open throttle. A 12V feed from the cold start sensor is noted. A legend defines symbols for a 1-way valve, vacuum spigot, and SIII OE (red) plumbing.

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Frequently asked questions

What does the red line indicate in this Jaguar XJ6 diagram?: Red indicates the Series III OE (original equipment) installation, per the notes and the legend ("= SIII OE").
When does the electric purge valve on the charcoal canister open?: The electric purge valve opens with power, and the canister's vacuum valve opens the purging path into the throttle neck on open throttle, provided the electric purge valve is opened along with the airpump valve.
How does the airpump operate on cold starts?: The airpump delivers output to the exhaust ports when its electric valve is opened on cold starts, but uses vacuum to control the valve during that time — high vacuum means less air is needed.
What does the differential 2-way valve do?: It maintains a small tank pressure, with easy airflow and a small spigot to the tank vents.
Where should the distributor hose go if not using the distributor vacuum regulator?: It should be brought to the upstream-of-throttle spigot, as noted next to the throttle body: "bring Dist hose here if not using Dist Vac Regulator."