Ford 60 Service Manual
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AP (Accelerator Pedal Position) ELECTRICAL COMPONENTS 104 • The AP (Accelerator Pedal) is a three track pedal. The AP incorporates three potentiometers. Through out the movement of the AP the resistance values of the three potentiometers must agree. During the movement of the AP if one of the three potentiometer readings do not agree, the check engine light will illuminate and the vehicle will continue to perform as normal. If two signals from the AP are lost the PCM will allow the engine to idle only and illuminate the check engine light. • The three-track pedal is a safety feature. The three track pedal takes the place of the Idle Validation Switch allowing for limited system failure and still maintaining performance. 50
Baro (Barometric Pressure) ELECTRICAL COMPONENTS 105 51 • The BP sensor is a three (3) wire variable capacitance sensor. • The PCM supplies a 5 volt reference signal which the BP sensor uses to produce a linear analog voltage signal that indicates pressure. • The primary function of the BP sensor is to provide altitude information so that the PCM can adjust timing, fuel quantity, glow plug on time, and VGT control.
CKP (Crankshaft Position) ELECTRICAL COMPONENTS • The crankshaft position signal source is a magnetic pickup sensor mounted in the right front side of the engine block. • The sensor reacts to a target wheel positioned on the crankshaft. The target wheel is a 60 minus 2 tooth steel disk with 58 evenly spaced teeth and a slot that’s width is equivalent to removing 2 teeth (minus 2 slot) that is the SYNC gap. • The sensor will produce pulses for each tooth edge that breaks the magnetic field created by the permanent magnet that is in the 106 creates a signal the relates to crankshaft speed and position relative to TDC (Top Dead Center). The CMP creates a signal relative to which stroke the piston is currently on (compression or exhaust). end of the sensor. • Crankshaft speed is derived from the frequency of the CKP sensor signal. • Crankshaft position can be determined by the sycronization of the CMP peg signal to the CKP minus 2 slot signal. • Diagnostic information on the CKP input signal is obtained by performing accuracy checks on fre- quency, and/or duty cycle with soft- ware strategies. • The PCM needs both the CKP and CMP signal to calculate engine speed and position. The CKP 52 WIDE SLOT
CMP (Camshaft Position) ELECTRICAL COMPONENTS 107 53 • The camshaft position signal source is a magnetic pickup sensor mounted on the left front side of the engine block. • The sensor reacts to a peg, pressed into the camshaft at the front of the engine. • The peg will pass the sensor once per camshaft revolution, the sensor will produce a single pulse correspondingly. • Camshaft speed is derived from the frequency of the CMP sensor signal.PCM to the FICM so that the FICM can perform fueling calculations. • The PCM conditions the signal and sends it out as TACH signal for body builder use. • Diagnostic information on the CMP input signal is obtained by performing accuracy checks on signal levels, frequency, and/or duty cycle with software strategies. • The ECM needs both the CKP and CMP signal to calculate engine speed and position. The CMP creates a signal that the PCM uses to indicate a particular bank. • The CMP contains a permanent magnet which creates a magnetic field, when the magnetic field is broken by the peg on the camshaft a signal is created. • A conditioned CMPO (Camshaft Position Output) is sent from the CAMSHAFT TIMING PIN
ELECTRICAL COMPONENTS 108 ECT (Engine Coolant Temp.) • When the temperature of the coolant increases, the resistance of the thermistor decreases and the signal voltage decreases. • The ECT sensor is a two (2) wire thermistor sensor. • The PCM supplies a 5 volt reference signal which the ECT sensor uses to produce an analog voltage. • The ECT sensor changes resistance when exposed to different temperatures. • When the temperature of the coolant decreases, the resistance of the thermistor increases and the signal voltage increases. 54
ELECTRICAL COMPONENTS 109 55 EGRVP (Exhaust Gas Recirculation Valve Position) • The EGRVP sensor is a three (3) wire potentiometer type sensor. • The PCM supplies a 5 volt reference voltage that the EGRVP uses to produce a linear analog voltage that indicates the amount of movement of the valve. • The PCM monitors EGRP as the engine is operating to modulate the EGR valve. • This is a closed loop function which means that the PCM continuously monitors the EGRVP to ensure proper valve operation.
EOP (Engine Oil Pressure Switch) ELECTRICAL COMPONENTS 11 0 • The EOP (Engine Oil Pressure Switch) is a switch that closes a circuit to ground after engine oil pressure reaches approximately 5-7psi. • This switch controls the oil pressure gauge on the instrument panel. When pressure is above 7psi the gauge will read normal and if the pressure drops below 6 psi the gauge will show 0. • The information from the switch is not fed back to the PCM in any way and is to be used as a reference only. 56
EOT (Engine Oil Temperature) ELECTRICAL COMPONENTS 111 57 • The EOT sensor is a two (2) wire thermistor type sensor. • The PCM supplies a 5 volt reference signal which the EOT sensor uses to produce an analog voltage that indicates temperature. • The PCM monitors engine oil temperature via the EOT sensor signal to control,EGR, glow plugs, VGT, and fuel quantity and timing throughout the operating range of the engine. • The EOT signal allows the PCM to compensate for oil viscosity variations due to temperaturechanges in the operating environment, ensuring adequate power and torque are available for all operating conditions.
EP (Exhaust Pressure) ELECTRICAL COMPONENTS 11 2 • The EP sensor is a three (3) wire variable capacitance sensor. • The PCM supplies a 5 volt reference signal which the EP sensor uses to produce a linear analog voltage that indicates pressure. • The EP measures exhaust back pressure so that the PCM can control the VGT and EGR system. 58
IAT1 (Intake Air Temperature #1) ELECTRICAL COMPONENTS 11 3 59 • The Intake Air Temperature1 (IAT1) sensor is a two wire thermistor sensor that is located inside the Mass Air Flow (MAF) sensor • The PCM supplies a 5 volt reference signal which the IAT1 uses to produce an analog voltage that indicates the intake air temperature. • The IAT1 sensor’s primary function is to measure intake air temperature to control the timing and fuel rate when cold starting. The continuous monitoring by the IAT1 sensor limits smoke emis-sions. • The MAF/IAT1 sensor is mounted in the intake air piping after the air filter.