P0451 - Evaporative Emission System Pressure Sensor/Switch Range/Performance
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P0451 - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH RANGE/PERFORMANCE
| Description: | Note: For some vehicle applications, DTC P0451 is set for a fuel tank pressure (FTP) sensor range (offset) concern. The DTC P0454 replaces the original P0451 for intermittent (noisy) sensor concerns. Until the phase in process is complete, noisy or offset FTP sensor concerns may set DTC P0451. The fuel tank pressure changes greater than 14 inches of water in 0.10 seconds. FTP sensor output is offset by + /- 1.7 inches of water. |
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| Diagnostic Aids: | Monitor the FTP PID and note if it changes from above 15 inches of water to below minus (-) 15 inches of water often in 1 minute. With the FTP sensor at atmospheric pressure, the FTP PID normally indicates 0 inches of water. Look for a minimum reading of +/- 1.7 inches of water as an indication of an offset condition. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | refer to PINPOINT TEST HX . | |||