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2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 1 of 162005 Ford Mustang : Diagnostics Diagnostic Routines Powertrain On Board Diagnostics Pinpoint Tests DD: Fuel RailPressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature (FRPT) SensorsDD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel RailPressure Temperature (FRPT) SensorsNOTEApplicable vehicles: 2005 Ford Aviator (All)2005 Ford Crown Victoria (All)2005 Ford E-150 (All Gasoline Engines)2005 Ford E-250 (All Gasoline Engines)2005 Ford E-350 (All Gasoline Engines)2005 Ford E-450 (All Gasoline Engines)2005 Ford Escape (All)2005 Ford Excursion (All Gasoline Engines)2005 Ford Expedition (All)2005 Ford Explorer (All)2005 Ford Explorer Sport Trac (All)2005 Ford F-150 (All)2005 Ford F-250 (All Gasoline Engines)2005 Ford F-350 (All Gasoline Engines)2005 Ford F-450 (All Gasoline Engines)2005 Ford F-550 (All Gasoline Engines)2005 Ford Five Hundred (All)2005 Ford Focus (All)2005 Ford Ford GT (All)2005 Ford Freestar (All)2005 Ford Freestyle (All)2005 Ford Grand Marquis (All)2005 Ford Lincoln LS (All)2005 Ford Mariner (All)2005 Ford Montego (All)2005 Ford Monterey (All)2005 Ford Mountaineer (All)2005 Ford Mustang (All)2005 Ford Navigator (All)2005 Ford Ranger (All)2005 Ford Sable (All)2005 Ford Taurus (All)2005 Ford Thunderbird (All)2005 Ford Town Car (All)2005 PCED On Board DiagnosticsSECTION 5: Pinpoint TestsProcedure revision date: /FreshView.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 2 of 16DD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature(FRPT) Sensors DD:IntroductionDD1 CONTINUOUS MEMORY DTC P0190, KOEO AND KOER DTCS P0192 AND P0193: CHECK FRP SENSOR FOR FUELLEAKSNote: Repair any fuel pump DTCs prior to this test. Key ON, engine running. Idle the engine for 2 minutes. Inspect the FRP vacuum hose between the intake manifold and theFRP sensor for air leaks and correct connection. Key in OFF position. Remove the vacuum hose from the FRP. Inspect the FRP and vacuum hose for traces of fuel.Is fuel present?YesNoINSTALL a new FRP sensor.GO to DD2.REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.GO to Pinpoint Test HC.DD2 CHECK THE VREF AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS Connect the vacuum hose to the FRP. FRP Sensor connector disconnected. Key ON, engine OFF. Measure the voltage between:VREF - Pin 1SIGRTN - Pin 2Is the voltage between 4.5 V - 5.5 V?YesNoFor DTC P0190, GO to DD9.For DTC P0192, GO to DD3.GO to C1.For DTC P0193, GO to DD5.DD3 INDUCE A HIGH VOLTAGE ON THE FRP CIRCUIT Key in OFF position.Note: If a diagnostic tool communication concern exists, immediately remove the jumper and follow the NO path in theRESULT/ACTION column. Connect a 5 amp fused jumper wire between the following:VREF - Pin 1FRP - Pin 3 Key ON, engine OFF. Access the PCM and monitor the FRP V PID.Is the voltage greater than 4.5 ew.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 3 of 16YesNoINSTALL a new FRP sensor.REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.GO to DD4.GO to Pinpoint Test HC.DD4 CHECK THE FRP CIRCUIT(S) FOR A SHORT TO SIGRTN OR GND IN THE HARNESS Key in OFF position. Remove the jumper wire(s). PCM connector disconnected. Measure the resistance between:FRPSIGRTN Measure the resistance between:FRPGroundIs the resistance greater than 10K ohms?YesNoINSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable ReadOnly Memory (EEPROM).REPAIR the shortcircuit.DD5 CHECK THE FRP CIRCUIT FOR AN OPEN IN THE HARNESS Key in OFF position. PCM connector disconnected. Measure the resistance between:FRPFRP - Pin 3Is the resistance less than 5 ohms?YesNoGO to DD6.REPAIR the open circuit.DD6 CHECK THE FRP CIRCUIT FOR A SHORT TO VREF Measure the resistance between:VREFFRPIs the resistance greater than 10K ohms?YesNoGO to DD7.REPAIR the short circuit.DD7 CHECK THE FRP CIRCUIT FOR A SHORT TO POWER Key ON, engine OFF. Measure the voltage between:FRP - Pin 3GroundIs any voltage reshView.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 4 of 16YesNoREPAIR the short circuit.GO to DD8.DD8 INDUCE A LOW VOLTAGE ON THE FRP CIRCUIT Key in OFF position. PCM connector connected.Note: If a diagnostic tool communication concern exists, immediately remove the jumper and follow the NO path in theRESULT/ACTION column. Connect a 5 amp fused jumper wire between the following:FRP - Pin 3SIGRTN - Pin 2 Key ON, engine OFF. Access the PCM and monitor the FRP V PID.Is the voltage less than 0.1 V?YesNoINSTALL a new FRP sensor.REFER to the fuel system WARNING informationat the beginning of Pinpoint Test HC.INSTALL a new PCM. REFER to Section 2, Flash ElectricallyErasable Programmable Read Only Memory (EEPROM).GO to Pinpoint Test HC.DD9 DTC P0191: CHECK FOR FUEL PUMP DTCS Check for self-test DTCs.Are DTCs P1233, P1234, P1235, P1236, P1237 or P1238 present?YesNoDISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to Section4, Diagnostic Trouble Code (DTC) Charts and Descriptions.GO toDD10.DD10 INSPECT ALL THE VACUUM HOSES CONNECTED TO THE INTAKE MANIFOLD FOR LEAKS Key in OFF position. FRP Sensor connector connected. Key ON, engine running. Allow the engine idle to stabilize. Inspect all the vacuum hoses connected to the intake manifold forleaks.Are any vacuum hose concerns present?YesNoISOLATE the fault and REPAIR as necessary.GO to DD11.DD11 CHECK THE FRP CONNECTOR FOR DAMAGE OR CORROSION Key in OFF position. FRP Sensor connector disconnected. Inspect the sensor, wiring, and connector for damage, corrosion, orwater /FreshView.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 5 of 16Is a concern present?YesNoREPAIR as necessary.GO to DD12.DD12 CHECK THE FRP PIDNote: The fuel pressure is likely to increase after the fuel pressure is relieved with the system closed. The rate and amount of thefuel pressure increase is dependent upon the ambient air and fuel temperatures.Note: Prepare to record the FRP PID value within5 seconds after the engine is shut off and also after the fuel pressure is relieved. FRP Sensor connector connected. Key ON, engine running. Allow the engine idle to stabilize. Access the PCM and monitor the FRP PID. Key in OFF position. Key ON, engine OFF. Record the FRP PID value within 5 seconds of the key off. Relieve the fuel pressure. Refer to the Workshop Manual Section 31000 Fuel System for the Fuel System Pressure Release procedure. Disable the fuel pump. Key ON, engine OFF. Record the FRP PID value within 5 seconds of completing the fuelsystem pressure release procedure.Is the difference between the recorded FRP PID values greater than 34 kPa (5 psi)?YesNoGO to Pinpoint Test HC.GO to DD13.DD13 COMPARE THE FRP PID TO THE MECHANICAL GAUGENote: Most mechanical gauges are referenced to atmospheric pressure. The FRP sensor is referenced to manifold pressure. Inorder to make a valid comparison, the engine must be off.Note: The vehicle may exhibit a long crank until the fuel system ispressurized. Key in OFF position. Connect a mechanical fuel pressure gauge. Key ON, engine OFF. Monitor the mechanical gauge. Access the PCM and monitor the FRP PID. Compare the FRP PID value to the mechanical gauge. Key in OFF position. Pressurize the fuel system. Refer to the Workshop Manual Section310-00 Fuel System for the Fuel System Pressure Release procedureto restore the fuel system pressure. Key ON, engine running. Allow the fuel pressure to stabilize. Key in OFF position. Key ON, engine OFF. Compare the FRP PID value to the mechanical shView.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 6 of 16Are the FRP PID values within 34 kPa (5 psi) of the mechanical gauge readings?YesNoINSTALL a new FRP sensor.INSTALL a new PCM. REFER to Section 2, Flash ElectricallyErasable Programmable Read Only Memory (EEPROM).REFER to the fuel system WARNING informationat the beginning of Pinpoint Test HC.GO to Pinpoint Test HC.DD14 CONTINUOUS MEMORY DTCS P0192 AND P0193: CHECK THE FRP CIRCUIT FOR AN INTERMITTENT CONCERNNote: Repair any fuel pump DTCs prior to this test. Key ON, engine OFF. Access the PCM and monitor the FRP V PID. While observing the PID, carry out the following: Tap on the sensor to simulate road shock. Wiggle the sensor connector. Wiggle, shake, and bend small sections of the wiring harness whileworking from the sensor to the PCM. Check the FRP connector for damage or corrosion.Is a fault present?YesNoISOLATE the fault and REPAIR as necessary.GO to Z1.DD15 KOEO AND KOER DTCS P0182 OR P0183: CHECK THE RESISTANCE OF THE FRT SENSOR Key in OFF position. FRT Sensor connector disconnected. Measure the resistance between:FRT - Pin 1SIGRTN - Pin 2Is the resistance between 2K ohms - 96K ohms?YesNoINSTALL a new FRT sensor.GO to DD16.REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.GO to Pinpoint Test HC.DD16 CHECK THE FRT FOR INTERNAL SHORTS Measure the resistance between:FRT - Pin 1GroundIs the resistance greater than 10K ohms?YesFor DTC P0182, GO to DD17.For DTC P0183, GO to DD19.NoINSTALL a new FRT sensor.REFER to the fuel system WARNING information at the beginning of Pinpoint Test HC.GO to Pinpoint Test iew.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014

2005 Ford Mustang - Diagnostics Diagnostic Routines Powertrain On Board Diagnostics P. Page 7 of 16YesNoDD17 CHECK THE FRT CIRCUIT(S) FOR A SHORT TO SIGRTN OR GND IN THE HARNESS PCM connector disconnected. Measure the resistance between:FRTSIGRTN Measure the resistance between:FRTGroundIs the resistance greater than 10K ohms?YesNoGO to DD18.REPAIR the short circuit.DD18 INDUCE A HIGH VOLTAGE ON THE FRT CIRCUIT PCM connector connected. Key ON, engine OFF. Access the PCM and monitor the FRT V PID.Is the voltage greater than 4.5 V?YesNoUnable to identify the fault atthis time.INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable ProgrammableRead Only Memory (EEPROM).GO to Z1.DD19 CHECK THE FRT AND SIG RTN CIRCUIT(S) FOR AN OPEN IN THE HARNESS PCM connector disconnected. Measure the resistance between:FRTFRT - Pin 1SIGRTNSIGRTN - Pin 2Are the resistances less than 5 ohms?YesNoGO to DD20.REPAIR the open circuit.DD20 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF Measure the resistance between:FRTVREFIs the resistance greater than 10K ohms?YesNoGO to DD21.REPAIR the short circuit to VREF.DD21 INDUCE A LOW VOLTAGE ON THE FRT CIRCUIT PCM connector /FreshView.aspx?key 6kAUBD5BruOJf%2f3tgozUqjXM3. 5/17/2014