2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines
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The Fuel Tank Pressure Sensor input circuit is checked <strong>for</strong> out of range values (P0452 short, P0453 open), noisyreadings (P0454 noisy) and an offset (P0451 offset). The offset test is new <strong>for</strong> the 2004 <strong>MY</strong>.Note that carryover 2004 <strong>MY</strong> software and 2003 <strong>MY</strong> and earlier software will set P0451 <strong>for</strong> the noisy sensor test.Note that an open power input circuit or stuck check valve generates a P1450.Fuel Tank Pressure Sensor Transfer FunctionFTP volts = [ Vref * ( 0.14167 * Tank Pressure) + 2.6250 ] / 5.00Volts A/D Counts in PCM Fuel Tank Pressure, Inches H 2 O0.100 20 -17.820.500 102 -15.01.208 247 -10.02.265 464 03.475. 712 6.04.750 973 15.04.90 1004 16.06Fuel Tank Pressure Sensor Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0452 – Fuel Tank Pressure Sensor Circuit LowP0453 – Fuel Tank Pressure Sensor Circuit HighP0454 – Fuel Tank Pressure Sensor Intermittent/Erratic (noisy)continuousNonenot applicable5 seconds <strong>for</strong> electrical malfunctions, 16.7 minutes <strong>for</strong> noisy sensor testTypical Fuel Tank Pressure Sensor check malfunction thresholds:P0452 (Fuel Tank Pressure Sensor Circuit Low): < -17.82 in H 2 OP0453 (Fuel Tank Pressure Sensor Circuit High): > 16.06 in H 2 OP0454 (Fuel Tank Pressure Sensor Circuit Noisy): > 14 in H 2 O change between samples, sampled every 10seconds, more than 100 fault occurrencesFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 35 OF 131
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