Following are vacuum diagrams for most of the engine and emissions package combinations covered by this guide. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.
If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.
Fig. Fig. 1 Vacuum hose routing-1971-72 Crown with 4M engine
Fig. Fig. 2 Vacuum hose routing-1970-10/70 Corona Mark II with 8R-C engine
Fig. Fig. 3 Vacuum hose routing-10/1970-71 Corona Mark II with 8R-C engine
Fig. Fig. 4 Vacuum hose routing-10/70-71 Corona Mark II with 8R-C engine and TCS
Fig. Fig. 5 Vacuum hose routing-1971-72 Corona Mark II with 18R-C engine
Fig. Fig. 6 Vacuum hose routing-1972-12/74 Corona Mark II with 2M and 4M engines
Fig. Fig. 7 Vacuum hose routing-1974-12/74 Corona Mark II with 4M engine and EGR
Fig. Fig. 8 Vacuum hose routing-12/74-11/76 Corona Mark II with 4M engine
Fig. Fig. 9 Vacuum hose routing-1970-10/70 Corona with 8R-C engine
Fig. Fig. 10 Vacuum hose routing-10/70-71 Corona with 8R-C engine
Fig. Fig. 11 Vacuum hose routing-10/70-71 Corona with 8R-C engine and TCS
Fig. Fig. 12 Vacuum hose routing-1971-73 Corona with 18R-C engine
Fig. Fig. 13 Vacuum hose routing-1974 Corona
Fig. Fig. 14 Vacuum hose routing-1975 Corona
Fig. Fig. 15 Vacuum hose routing-1976 Corona
Fig. Fig. 16 Vacuum hose routing-1977 Corona
Fig. Fig. 17 Vacuum hose routing-1978 Corona (High Altitude models)
Fig. Fig. 18 Vacuum hose routing-1978 Corona (California models)
Fig. Fig. 19 Vacuum hose routing-1978 Corona (Federal models)
Fig. Fig. 20 Vacuum hose routing-1979 Corona (Federal models)
Fig. Fig. 21 Vacuum hose routing-1979 Corona (Federal models)
Fig. Fig. 22 Vacuum hose routing-1979 Corona (Canadian models)
Fig. Fig. 23 Vacuum hose routing-1980 Corona (Federal models)
Fig. Fig. 24 Vacuum hose routing-1980 Corona (California models)
Fig. Fig. 25 Vacuum hose routing-1980 Corona (Canadian models)
Fig. Fig. 26 Vacuum hose routing-1981 Corona (Federal and High Altitude models)
Fig. Fig. 27 Vacuum hose routing-1981 Corona (Canadian models)
Fig. Fig. 28 Vacuum hose routing-1982 Corona (USA models)
Fig. Fig. 29 Vacuum hose routing-1982 Corona (Canadian models)
Fig. Fig. 30 Vacuum hose routing-1978 Cressida
Fig. Fig. 31 Vacuum hose routing-1979 Cressida
Fig. Fig. 32 Vacuum hose routing-1980 Cressida
Fig. Fig. 33 Vacuum hose routing-1981-82 Cressida
Fig. Fig. 34 Emission Systems Descriptions
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