See Figure 1
The engine and emission control system covered by this information operate on a combination of vacuum and electrical signals; they are extremely prone to malfunctions due to improper vacuum connections. If a component does not receive vacuum at the correct time, it cannot function when needed. When working under the hood, pay close attention to the routing and placement of every hose.
Fig. Fig. 1: The vacuum hoses are usually numbered for easy identification
Following is a listing of vacuum diagrams for most of the engine and emissions package combinations covered by this information. 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 car'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 these labels available for purchase. The labels can usually be ordered from a local dealer.
See Figures 2 through 75
Fig. Fig. 2: Vacuum hose routing-1984 Accord
Fig. Fig. 3: Emission component schematic-1984 Accord
Fig. Fig. 4: Vacuum hose routing-1985 carbureted Accord
Fig. Fig. 5: Emission component schematic-1985 carbureted Accord
Fig. Fig. 6: Vacuum hose routing-1985 fuel injected Accord
Fig. Fig. 7: Vacuum hose routing-1986 carbureted Accord with manual transaxle
Fig. Fig. 8: Vacuum hose routing-1986 carbureted Accord with automatic transaxle
Fig. Fig. 9: Emission component schematic-1986 carbureted Accord with manual transaxle
Fig. Fig. 10: Emission component schematic-1986 carbureted Accord with automatic transaxle
Fig. Fig. 11: Vacuum hose routing-1986 fuel injected Accord
Fig. Fig. 12: Emission component schematic-1986 fuel injected Accord
Fig. Fig. 13: Vacuum hose routing-1987 carbureted Accord with manual transaxle
Fig. Fig. 14: Vacuum hose routing-1987 carbureted Accord with automatic transaxle
Fig. Fig. 15: Emission component schematic-1987 carbureted Accord with manual transaxle
Fig. Fig. 16: Emission component schematic-1987 carbureted Accord with automatic transaxle
Fig. Fig. 17: Vacuum hose routing-1987 fuel injected Accord
Fig. Fig. 18: Vacuum hose routing-1988 carbureted Accord with manual transaxle
Fig. Fig. 19: Vacuum hose routing-1988 carbureted Accord with automatic transaxle
Fig. Fig. 20: Emission component schematic-1988 carbureted Accord with manual transaxle
Fig. Fig. 21: Emission component schematic-1988 carbureted Accord with automatic transaxle
Fig. Fig. 22: Vacuum hose routing-1988 fuel injected Accord
Fig. Fig. 23: Emission component schematic-1988 fuel injected Accord
Fig. Fig. 24: Vacuum hose routing-1989 carbureted Accord with manual transaxle
Fig. Fig. 25: Emission component schematic-1989 carbureted Accord with manual transaxle
Fig. Fig. 26: Emission component schematic-1989 carbureted Accord with automatic transaxle
Fig. Fig. 27: Vacuum hose routing-1989 fuel injected Accord
Fig. Fig. 28: Emission component schematic-1989 fuel injected Accord
Fig. Fig. 29: Vacuum hose routing-1990 Accord
Fig. Fig. 30: Emission component schematic-1990 Accord
Fig. Fig. 31: Vacuum hose routing-1991 Accord except SE and EX-R
Fig. Fig. 32: Emission component schematic-1991 Accord except SE and EX-R
Fig. Fig. 33: Vacuum hose routing-1991 Accord SE and EX-R
Fig. Fig. 34: Emission component schematic-1991 Accord SE and EX-R
Fig. Fig. 35: Vacuum hose routing-1992-93 Accord DX and LX (LX and EX in Canada)
Fig. Fig. 36: Emission component schematic-1992-93 Accord DX and LX (LX and EX in Canada)
Fig. Fig. 37: Vacuum hose routing-1992-93 Accord EX (EX-R in Canada)
Fig. Fig. 38: Vacuum hose routing-1994-95 Accord with F22B1 engine (except EX with F22B1-21)
Fig. Fig. 39: Emission component schematic-1994-95 Accord with F22B1 engine (except EX with F22B1-21)
Fig. Fig. 40: Vacuum hose routing-1994-95 Accord EX with F22B1-21 engine
Fig. Fig. 41: Emission component schematic-1994-95 Accord EX with F22B1-21 engine
Fig. Fig. 42: Vacuum hose routing-1994-95 Accord with F22B2 engine
Fig. Fig. 43: Emission component schematic-1994-95 Accord with F22B2 engine
Fig. Fig. 44: Vacuum hose routing-1995 Accord V-6
Fig. Fig. 45: Emission component schematic-1995 Accord V-6
Fig. Fig. 46: Vacuum hose routing-1984-85 carbureted Prelude
Fig. Fig. 47: Emission component schematic-1984-85 carbureted Prelude
Fig. Fig. 48: Vacuum hose routing-1985 fuel injected Prelude
Fig. Fig. 49: Emission component schematic-1985 fuel injected Prelude
Fig. Fig. 50: Vacuum hose routing-1986 carbureted Prelude
Fig. Fig. 51: Emission component schematic-1986 carbureted Prelude
Fig. Fig. 52: Vacuum hose routing-1986 fuel injected Prelude
Fig. Fig. 53: Emission component schematic-1986 fuel injected Prelude
Fig. Fig. 54: Vacuum hose routing-1987 carbureted Prelude
Fig. Fig. 55: Emission component schematic-1987 carbureted Prelude
Fig. Fig. 56: Vacuum hose routing-1987 fuel injected Prelude
Fig. Fig. 57: Vacuum hose routing-1988 carbureted Prelude (except California)
Fig. Fig. 58: Vacuum hose routing-1988 carbureted Prelude (California)
Fig. Fig. 59: Emission component schematic-1988 carbureted Prelude
Fig. Fig. 60: Vacuum hose routing-1988 fuel injected Prelude
Fig. Fig. 61: Emission component schematic-1988 fuel injected Prelude
Fig. Fig. 62: Vacuum hose routing-1989 carbureted Prelude (except California)
Fig. Fig. 63: Vacuum hose routing-1989 carbureted Prelude (California)
Fig. Fig. 64: Emission component schematic-1989 carbureted Prelude
Fig. Fig. 65: Vacuum hose routing-1989 fuel injected Prelude
Fig. Fig. 66: Vacuum hose routing-1990 carbureted Prelude (California)
Fig. Fig. 67: Emission component schematic-1990 carbureted Prelude
Fig. Fig. 68: Vacuum hose routing-1990-91 fuel injected Prelude (2.0L engine)
Fig. Fig. 69: Emission component schematic-1990-91 fuel injected Prelude (2.0L engine)
Fig. Fig. 70: Vacuum hose routing-1990-91 fuel injected Prelude (2.1L engine)
Fig. Fig. 71: Emission component schematic-1990-91 fuel injected Prelude (2.1L engine)
Fig. Fig. 72: Vacuum hose routing-1992-95 Prelude with H23A1 and H22A1 engines
Fig. Fig. 73: Vacuum hose routing-1992-95 Prelude with F22A1 engine
Fig. Fig. 74: Emission component schematic-1992-95 Prelude with H23A1 and H22A1 engines
Fig. Fig. 75: Emission component schematic-1992-95 Prelude with F22A1 engine
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