Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
EVAP System
2004 Acura 3.5RLSECTION EVAP System
DTC P1456: Test ID $21: Component ID $83
| Test ID | $21 | Test Limit Type and Component ID | $83 |
| DTC | P1456 | ||
| Test Description | Monitoring the fluctuation of fuel tank pressure sensor output before and after EVAP bypass solenoid valve is opened after engine starting with cold condition. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $26: Component ID $83
| Test ID | $26 | Test Limit Type and Component ID | $83 |
| DTC | P1456 | ||
| Test Description | Monitoring either of:
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| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $27: Component ID $83
| Test ID | $27 | Test Limit Type and Component ID | $83 |
| DTC | P1456 | ||
| Test Description | Monitoring the fluctuation of fuel tank pressure sensor output before and after the EVAP bypass solenoid valve is opened, after fuel tank pressure check is completed in predetermined time after engine starting with cold condition | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $38: Component ID $03
| Test ID | $38 | Test Limit Type and Component ID | $03 |
| DTC | P1456 | ||
| Test Description | Monitoring the difference of fuel tank pressure sensor output in pressure retention mode after decompressing the fuel tank. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value x 0.488281 (mmHg) |
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DTC P1457: Test ID $29: Component ID $83
| Test ID | $29 | Test Limit Type and Component ID | $83 |
| DTC | P1457 | ||
| Test Description | Monitoring the fuel tank pressure sensor output when EVAP control canister vent shut valve is closed after releasing the pressure in EVAP vapor line. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 - 62.500000 (mmHg) The lowest limit value: Output value x 0.488281 - 62.500000 (mmHg) The highest limit value: Not applicable |
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DTC P0497: Test ID $2D: Component ID $03
| Test ID | $2D | Test Limit Type and Component ID | $03 |
| DTC | P0497 | ||
| Test Description | Purge flow check by monitoring fuel tank pressure sensor value while the engine is running. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 - 62.500000 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value x 0.488281 - 62.500000 (mmHg) |
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DTC P1457: Test ID $2E: Component ID $83
| Test ID | $2E | Test Limit Type and Component ID | $83 |
| DTC | P1457 | ||
| Test Description | Monitoring the fluctuation of fuel tank pressure sensor output after opening EVAP bypass solenoid valve while maintaining decompressed pressure in EVAP vapor line. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1457: Test ID $2F: Component ID $83
| Test ID | $2F | Test Limit Type and Component ID | $83 |
| DTC | P1457 | ||
| Test Description | Monitoring the fuel tank pressure sensor output when EVAP canister purge valve is closed. and EVAP bypass solenoid and EVAP canister vent shut valves are opened before decompressing pressure in EVAP vapor line. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 - 62.500000 (mmHg) The lowest limit value: Output value x 0.488281 - 62.500000 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $3A: Component ID $83
| Test ID | $3A | Test Limit Type and Component ID | $83 |
| DTC | P1456 | ||
| Test Description | Monitoring the fluctuation of fuel tank pressure sensor before and after the EVAP bypass solenoid valve is opened after engine starting with cold condition. | ||
| Store Timing | Normal judgement/ | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $3B: Component ID $83
| Test ID | $3B | Test Limit Type and Component ID | $83 |
| DTC | P1456 | ||
| Test Description | Monitoring the difference between the sensor output when EVAP control canister vent shut and EVAP bypass solenoid valves are opened before performing tank leak check, and the sensor output during tank leak check. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P1456: Test ID $3C: Component ID $03
| Test ID | $3C | Test Limit Type and Component ID | $03 |
| DTC | P1456 | ||
| Test Description | Monitoring the valve calculated by dividing the difference of fuel tank pressure sensor output in pressure retention mode after decompressing the fuel tank by EVAP leak monitoring time. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: No unit The lowest limit value: Not applicable The highest limit value: No unit |
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DTC P1457: Test ID $3E: Component ID $83
| Test ID | $3E | Test Limit Type and Component ID | $83 |
| DTC | P1457 | ||
| Test Description | Monitoring the fluctuation of fuel tank pressure sensor output after opening EVAP bypass solenoid valve while maintaining decompressing pressure in EVAP vapor line. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value x 0.488281 (mmHg) The lowest limit value: Output value x 0.488281 (mmHg) The highest limit value: Not applicable |
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DTC P0496: Test ID $81: Component ID $80
| Test ID | $81 | Test Limit Type and Component ID | $80 |
| DTC | P0496 | ||
| Test Description | EVAP canister purge valve "stuck open" check by monitoring fuel tank pressure sensor while the engine is running. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P2422: Test ID $82: Component ID $80
| Test ID | $82 | Test Limit Type and Component ID | $80 |
| DTC | P2422 | ||
| Test Description | EVAP canister purge valve "stuck close" check by monitoring fuel tank pressure sensor while the engine is running. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P2422: Test ID $8F: Component ID $80
| Test ID | $8F | Test Limit Type and Component ID | $80 |
| DTC | P2422 | ||
| Test Description | EVAP canister purge valve "stuck close" check by monitoring fuel tank pressure sensor at engine start. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P0497: Test ID $83: Component ID $00
| Test ID | $83 | Test Limit Type and Component ID | $00 |
| DTC | P0497 | ||
| Test Description | Monitoring the difference of fuel tank pressure sensor value when integrated value of purge flow rate reaches more than certain level after engine starts with cold condition and then the tank is decompressed to certain level, and intake air is opened. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0457: Test ID $85: Component ID $00
| Test ID | $85 | Test Limit Type and Component ID | $00 |
| DTC | P0457 | ||
| Test Description | Gross leak check of EVAP system by monitoring the fuel tank pressure sensor value while the engine is running. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0455: Test ID $86: Component ID $00
| Test ID | $86 | Test Limit Type and Component ID | $00 |
| DTC | P0455 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor signal while EVAP system is decompression. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) |
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DTC P0456: Test ID $87: Component ID $00
| Test ID | $87 | Test Limit Type and Component ID | $00 |
| DTC | P0456 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the soak period after the engine is turned off. (EONV) | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) / 16384 The lowest limit value: Not applicable The highest limit value: Output value (Decimal) / 16384 |
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DTC P0497: Test ID $88: Component ID $00
| Test ID | $88 | Test Limit Type and Component ID | $00 |
| DTC | P0497 | ||
| Test Description | Purge flow check by monitoring fuel tank pressure sensor value while the engine is running. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0457: Test ID $8B: Component ID $00
| Test ID | $8B | Test Limit Type and Component ID | $00 |
| DTC | P0457 | ||
| Test Description | Loose fuel cap check or gross leak check of EVAP system by monitoring the fuel tank pressure sensor signal while EVAP system is decompressing. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0457: Test ID $8D: Component ID $00
| Test ID | $8D | Test Limit Type and Component ID | $00 |
| DTC | P0457 | ||
| Test Description | Gross leak check of EVAP system by monitoring the fuel tank pressure sensor value after decompress mode. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0442: Test ID $90: Component ID $00
| Test ID | $90 | Test Limit Type and Component ID | $00 |
| DTC | P0442 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value before purge started. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0442: Test ID $91: Component ID $80
| Test ID | $91 | Test Limit Type and Component ID | $80 |
| DTC | P0442 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value while the engine is running. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P0442: Test ID $92: Component ID $80
| Test ID | $92 | Test Limit Type and Component ID | $80 |
| DTC | P0442 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the decompression mode. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P0442: Test ID $93: Component ID $00
| Test ID | $93 | Test Limit Type and Component ID | $00 |
| DTC | P0442 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the decompression mode. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg/min.) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg/min.) |
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DTC P0456: Test ID $94: Component ID $00
| Test ID | $94 | Test Limit Type and Component ID | $00 |
| DTC | P0456 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value while the engine is running. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) |
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DTC P0456: Test ID $95: Component ID $80
| Test ID | $95 | Test Limit Type and Component ID | $80 |
| DTC | P0456 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the decompression mode. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The lowest limit value: Output value (Decimal) x 0.1 (mmHg) - 3276.8 (mmHg) The highest limit value: Not applicable |
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DTC P0456: Test ID $96: Component ID $00
| Test ID | $96 | Test Limit Type and Component ID | $00 |
| DTC | P0456 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the decompression mode. | ||
| Store Timing | Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg/min.) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg/min.) |
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DTC P0456: Test ID $97: Component ID $00
| Test ID | $97 | Test Limit Type and Component ID | $00 |
| DTC | P0456 | ||
| Test Description | Leak check of EVAP system by monitoring the fuel tank pressure sensor value during the decompression mode. | ||
| Store Timing | Normal judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) x 0.1 (mmHg/min.) The lowest limit value: Not applicable The highest limit value: Output value (Decimal) x 0.1 (mmHg/min.) |
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DTC P0456: Test ID $98: Component ID $00
| Test ID | $98 | Test Limit Type and Component ID | $00 |
| DTC | P0456 | ||
| Test Description | Monitoring 0.02 inch leak based on change of evaporative pressure after engine stops and an index indicated air opening failure including aberration of PTANK 0 point. | ||
| Store Timing | Normal judgement/Failure judgement | ||
| Conversion to Engineering Units | Measured value: Output value (Decimal) / 16384 The lowest limit value: Not Applicable The highest limit value: Output value (Decimal) / 16384 |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.