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
There are several different styles of hardware used to control airflow within the engine air intake system. In general,the devices are defined based on whether they control in-cylinder motion (charge motion) or manifold dynamics(tuning).Systems designed to control charge motion are defined to be Intake Manifold Runner Controls. IMRC systemsgenerally have to modify spark when the systems are active because altering the charge motion affects the burnrate within the cylinder.Systems designed to control intake manifold dynamics or tuning are defined to be Intake Manifold Tuning Valves.IMTV systems generally do not require any changes to spark or air/fuel ratio because these systems only alter theamount of airflow entering the engine./$!The Intake Manifold Runner Control (IMRC) consists of a remote mounted, electrically motorized actuator with anattaching cable for each housing on each bank. Some applications will use one cable for both banks. The cable orlinkage attaches to the housing butterfly plate levers. (The 2.0L (2V) Focus/Escort IMRC uses a motorized actuatormounted directly to a single housing without the use of a cable.)The IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is alwaysopen and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold thebutterfly valve plates closed. The motorized actuator houses an internal switch or switches, depending on theapplication, to provide feedback to the PCM indicating cable and butterfly valve plate position.Below approximately 3000 rpm, the motorized actuator will not be energized. This will allow the cable to fullyextend and the butterfly valve plates to remain closed. Above approximately 3000 rpm, the motorized actuator willbe energized. The attaching cable will pull the butterfly valve plates into the open position. (Some vehicles willactivate the IMRC near 1500 rpm.)The Intake Manifold Swirl Control used on the 2.3L Ranger consists of a manifold mounted vacuum actuator and aPCM controlled electric solenoid. The linkage from the actuator attaches to the manifold butterfly plate lever. TheIMSC actuator and manifold are composite/plastic with a single intake air passage for each cylinder. The passagehas a butterfly valve plate that blocks 60% of the opening when actuated, leaving the top of the passage open togenerate turbulence. The housing uses a return spring to hold the butterfly valve plates open. The vacuumactuator houses an internal monitor circuit to provide feedback to the PCM indicating butterfly valve plate position.Below approximately 3000 rpm, the vacuum solenoid will be energized. This will allow manifold vacuum to beapplied and the butterfly valve plates to remain closed. Above approximately 3000 rpm, the vacuum solenoid willbe de-energized. This will allow vacuum to vent from the actuator and the butterfly valve plates to open.IMRC System Check Operation:DTCs P1516/P2014 - IMRC input switch electrical check, Bank 1P1517/P0219 - IMRC input switch electrical check, Bank 2P1520/P2008 - IMRC output electrical checkP1518/P2004 - IMRC stuck open, electric operatedP1537/P2004 – IMRC stuck open, vacuum operated, Bank 1P1538/P2005 – IMRC stuck open, vacuum operated, Bank 2Monitor executionContinuous, after ECT > 40 deg FMonitor SequenceNoneSensors OKMonitoring Duration5 secondsFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 86 OF 131
Typical IMRC functional check malfunction thresholdsIMRC plates do not match commanded position (functional)IMRC switches open/shorted (electrical)/;26The intake manifold tuning valve (IMTV) is a motorized actuated unit mounted directly to the intake manifold. TheIMTV actuator controls a shutter device attached to the actuator shaft. There is no monitor input to the PCM withthis system to indicate shutter position.The motorized IMTV unit will not be energized below approximately 2600 rpm or higher on some vehicles. Theshutter will be in the closed position not allowing airflow blend to occur in the intake manifold. Above approximately2600 rpm or higher, the motorized unit will be energized. The motorized unit will be commanded on by the PCMinitially at a 100 percent duty cycle to move the shutter to the open position and then falling to approximately 50percent to continue to hold the shutter open.IMTV Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1549 or P0660 - IMTV output electrical check (does not illuminate MIL)continuousNone5 seconds2+!;Variable Cam Timing (VCT) enables rotation of the camshaft(s) relative to the crankshaft (phase-shifting) as afunction of engine operating conditions. There are four possible types of VCT with DOHC engines:• Intake Only (phase-shifting only the intake cam);• Exhaust Only (phase-shifting only the exhaust cam);• Dual Equal (phase-shifting the intake and exhaust cams equally);• Dual Independent (phase-shifting the intake and exhaust cams independently).All four types of VCT are used primarily to increase internal residual dilution at part throttle to reduce NOx, and toimprove fuel economy. This allows for elimination the external EGR system. Ford currently uses Exhaust Only butis introducing Intake Only on the Lincoln LS and F-series trucks.With Exhaust Only VCT, the exhaust camshaft is retarded at part throttle to delay exhaust valve closing forincreased residual dilution and to delay exhaust valve opening for increased expansion work.With Intake Only VCT, the intake camshaft is advanced at part throttle and WOT (at low to mid-range enginespeeds) to open the intake valve earlier for increased residual dilution and close the intake valve earlier in thecompression stroke for increased power.The VCT system hardware consists of a control solenoid and a pulse ring on the camshaft. The PCM calculatesrelative cam position using the CMP input to process variable reluctance sensor pulses coming from the pulse ringmounted on the camshaft. Each pulse wheel has N + 1 teeth where N = the number of cylinders per bank. The Nequally spaced teeth are used for cam phasing; the remaining tooth is used to determine cylinder # 1 position.Relative cam position is calculated by measuring the time between the rising edge of profile ignition pickup (PIP)and the falling edges of the VCT pulses.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 87 OF 131
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- Page 64 and 65: $. 6The Electric Stepper Motor EGR
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- Page 74 and 75: ;#11!%;11!)The purpose of the TPPC
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- Page 78 and 79: Fuel Rail Pressure Sensor Check Ope
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- Page 84 and 85: The Idle Air Control (IAC) solenoid
- Page 88 and 89: The PCM continually calculates a ca
- Page 90 and 91: Most vehicle applications no longer
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- Page 124 and 125: shift, rpm does not go up during a
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There are several different styles of hardware used to control airflow within the engine air intake system. In general,the devices are defined based on whether they control in-cylinder motion (charge motion) or manifold dynamics(tuning).<strong>System</strong>s designed to control charge motion are defined to be Intake Manifold Runner Controls. IMRC systemsgenerally have to modify spark when the systems are active because altering the charge motion affects the burnrate within the cylinder.<strong>System</strong>s designed to control intake manifold dynamics or tuning are defined to be Intake Manifold Tuning Valves.IMTV systems generally do not require any changes to spark or air/fuel ratio because these systems only alter theamount of airflow entering the engine./$!The Intake Manifold Runner Control (IMRC) consists of a remote mounted, electrically motorized actuator with anattaching cable <strong>for</strong> each housing on each bank. Some applications will use one cable <strong>for</strong> both banks. The cable orlinkage attaches to the housing butterfly plate levers. (The 2.0L (2V) Focus/Escort IMRC uses a motorized actuatormounted directly to a single housing without the use of a cable.)The IMRC housing is an aluminum casting with two intake air passages <strong>for</strong> each cylinder. One passage is alwaysopen and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold thebutterfly valve plates closed. The motorized actuator houses an internal switch or switches, depending on theapplication, to provide feedback to the PCM indicating cable and butterfly valve plate position.Below approximately 3000 rpm, the motorized actuator will not be energized. This will allow the cable to fullyextend and the butterfly valve plates to remain closed. Above approximately 3000 rpm, the motorized actuator willbe energized. The attaching cable will pull the butterfly valve plates into the open position. (Some vehicles willactivate the IMRC near 1500 rpm.)The Intake Manifold Swirl Control used on the 2.3L Ranger consists of a manifold mounted vacuum actuator and aPCM controlled electric solenoid. The linkage from the actuator attaches to the manifold butterfly plate lever. TheIMSC actuator and manifold are composite/plastic with a single intake air passage <strong>for</strong> each cylinder. The passagehas a butterfly valve plate that blocks 60% of the opening when actuated, leaving the top of the passage open togenerate turbulence. The housing uses a return spring to hold the butterfly valve plates open. The vacuumactuator houses an internal monitor circuit to provide feedback to the PCM indicating butterfly valve plate position.Below approximately 3000 rpm, the vacuum solenoid will be energized. This will allow manifold vacuum to beapplied and the butterfly valve plates to remain closed. Above approximately 3000 rpm, the vacuum solenoid willbe de-energized. This will allow vacuum to vent from the actuator and the butterfly valve plates to open.IMRC <strong>System</strong> Check <strong>Operation</strong>:DTCs P1516/P2014 - IMRC input switch electrical check, Bank 1P1517/P0219 - IMRC input switch electrical check, Bank 2P1520/P2008 - IMRC output electrical checkP1518/P2004 - IMRC stuck open, electric operatedP1537/P2004 – IMRC stuck open, vacuum operated, Bank 1P1538/P<strong>2005</strong> – IMRC stuck open, vacuum operated, Bank 2Monitor executionContinuous, after ECT > 40 deg FMonitor SequenceNoneSensors OKMonitoring Duration5 secondsFORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 86 OF 131
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