Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw
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Automotive Electrical and Electronic Systems Classroom Manual Fifth Edition Update by John F. Kershaw

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02.10.2022 Views

The Ignition: Primary and Secondary Circuits and Components 2371T:5.92 VHALLEFFECTPOWER SUPPLYORSIGNAL LINEGYSENSOR RETURNBK/LB8 VOLTS OR 9 VOLTSPOWER BOARDLOGIC BOARDCOMPUTERSENSESHERESAMEHOUSINGON SMECAND SBECCOMPUTERCH 12VM 10msFigure 11-16. A lab scope displays an AC sincewave during cranking on HEI Terminal “P.”1TCH 1 2V CH 25VFigure 11-18. The lab scope displays the Hall Effectoutput signal transmitted to the PCM.CH 1 5V CH 210 V M 2.5msFigure 11-17. The HEI primary circuit voltage trace isdisplayed on the top and the square-wave referencesignal is displayed on the bottom of the scope screen.and there are usually no ignition wires to the sparkplugs, Figure 11-25. Also, the coil over plug systemfires each cylinder sequentially rather thanusing the waste spark method.IGNITION COILSThe ignition coil steps up voltage in the same wayas a transformer. When the magnetic field of thecoil primary winding collapses, it induces a highvoltage in the secondary winding.Coil Secondary Windingand Primary-to-SecondaryConnectionsTwo windings of copper wire compose the ignitioncoil. The primary winding of heavy wiresconsists of 100 to 150 turns; the secondary windingis 15,000 to 30,000 turns of a fine wire. Theratio of secondary turns to primary turns is usuallybetween 100 and 200. To increase thestrength of the magnetic field, the windings arewrapped around a laminated core of soft iron,Figure 11-26.The coil must be protected from the underhoodenvironment to maintain its efficiency. Four coildesigns are used:• Oil-filled coil• Laminated E-core coil• DIS coil packs• Coil over plug assembliesOil-filled CoilIn the oil-filled coil, the primary winding iswrapped around the secondary winding, which iswrapped around the iron core. The coil windings

DISTRIBUTOR IGNITION SCHEMATIC EXAMPLEDISTRIBUTOR IGNITION SCHEMATIC (5.8./7.5. E AND F SERIES)OFFTO B+SYSTEM: REMOTE MOUNTEDDISTRIBUTOR,COMPUTER CONTROLLEDDWELL (CCD)RUNOFF(DISTRIBUTOR BASEIS THE GROUND SOURCE)ICMPIP BSPOUTIDM (FTO)ICM PWRCOIL -GNDSTARTPIPCMP PWRGNDIGN GNDSHIELDCLOSEDBOWLDISTRIBUTOR(SEALED)SPOUT IN-LINECONNECTORPCMPIN 50PIN 49PIN 23PIN 48E-COREIGNITION COILB+REMOTE IGNITION CONTROL MODULEMOTORCRAFT654321PIPSPOUTIDMICM PWRCOILGNDFigure 11-19.Schematic of the Ford TFI CCD ignition system on late-model trucks. (Courtesy of Ford Motor Company)ICM WAVEFORM EXAMPLES(DISTRIBUTOR IGNITION)DWELLIDM (FTO)SPOUTSIGNATURE PIPPIPFigure 11-20.238The IDM, SPOUT, and PIP signals are monitored to check power input, power output, and ground.

DISTRIBUTOR IGNITION SCHEMATIC EXAMPLE

DISTRIBUTOR IGNITION SCHEMATIC (5.8./7.5. E AND F SERIES)

OFF

TO B+

SYSTEM: REMOTE MOUNTED

DISTRIBUTOR,COMPUTER CONTROLLED

DWELL (CCD)

RUN

OFF

(DISTRIBUTOR BASE

IS THE GROUND SOURCE)

ICM

PIP B

SPOUT

IDM (FTO)

ICM PWR

COIL -

GND

START

PIP

CMP PWR

GND

IGN GND

SHIELD

CLOSED

BOWL

DISTRIBUTOR

(SEALED)

SPOUT IN-LINE

CONNECTOR

PCM

PIN 50

PIN 49

PIN 23

PIN 48

E-CORE

IGNITION COIL

B+

REMOTE IGNITION CONTROL MODULE

MOTORCRAFT

6

5

4

3

2

1

PIP

SPOUT

IDM

ICM PWR

COIL

GND

Figure 11-19.

Schematic of the Ford TFI CCD ignition system on late-model trucks. (Courtesy of Ford Motor Company)

ICM WAVEFORM EXAMPLES

(DISTRIBUTOR IGNITION)

DWELL

IDM (FTO)

SPOUT

SIGNATURE PIP

PIP

Figure 11-20.

238

The IDM, SPOUT, and PIP signals are monitored to check power input, power output, and ground.

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