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1991 1999 ford explorer chilton User Manual

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Page 191

Ignition coil secondary resistance test
REMOVAL & INSTALLATION Disconnect the negative battery cable.
1. 
Label and detach all wiring from the ignition coil.
2. 
Remove the ignition coil-to-bracket bolts, then remove the ignition coil.
3. 
If necessary, at this time the radio ignition interference capacitor can be removed from the ignition
coil.
4. 
To install: If necessary, install the radio interference capacitor onto the ignition coil. Tighten the mounting bolt
to 25-35 inch lbs. (2.8-4.0 Nm).
5....

Page 192

View of the remote mounted Ignition Control Module (ICM)
Click to enlarge
Disconnect the negative battery cable.
1. 
Label and detach all wiring from the ICM.
2. 
Remove the ICM/heatsink-to-fender apron bolts, then remove the ICM/heatsink.
3. 
If necessary, at this time the ICM can be removed from the heat sink.
4. 
To install: Apply an approximately  1
/32  in. (0.80mm) thick layer of silicone dielectric compound (D7AZ-19A331-A or equivalent) to the base
plate of the ICM. /
5. 
Install the ICM onto the...

Page 193

Install the retaining screws. Tighten to 15-35 inch lbs (1.7-4.0 Nm), starting with the upper right
screw.
6. 
Install the distributor into the engine. Install the cap and wires.
7. 
Reconnect the negative battery cable.
8. 
Recheck the initial timing. Adjust if necessary.
9. 
Distributor
REMOVAL & INSTALLATION
Exploded view of the distributor mounted ICM distributorClick to enlarge
HOW TO USE THIS BOOK
182 Distributor 

Page 194

Example of the remote mounted ICM distributor
Click to enlarge
Rotate the engine until the No. 1 piston is on Top Dead Center (TDC) of its compression stroke.
1. 
Disconnect the negative battery cable. Disconnect the vehicle wiring harness connector from the
distributor. Before removing the distributor cap, mark the position of the No. 1 wire tower on the cap
for reference.
2. 
Loosen the distributor cap hold-down screws and remove the cap. Matchmark the position of the
rotor to the distributor housing....

Page 195

Rotate the distributor shaft so the rotor points toward the mark on the distributor housing
made previously.
1. 
Rotate the rotor slightly so the leading edge of the vane is centered in the vane switch state
assembly.
2. 
Rotate the distributor in the block to align the leading edge of the vane with the vane switch
stator assembly. Make certain the rotor is pointing to the No. 1 mark on the distributor base.
3. 
If the vane and vane switch stator cannot be aligned by rotating the distributor in the...

Page 196

DISTRIBUTORLESS IGNITION SYSTEM
General Information
The distributorless ignition system used by 1991-94 2.3L and 4.0L, and all 1995-99 engines is referred to as
the Electronic Ignition (EI) system. It eliminates the conventional distributor by utilizing multiple ignition
coils instead. The EI system consists of the following components:
Crankshaft Position (CKP) sensor
· 
Ignition Control Module (ICM) (EEC-IV systems only)
· 
Ignition coil(s)
· 
The spark angle portion of the Powertrain Control Module...

Page 197

Common wiring schematic for an EEC-IV distributorless ignition system
Click to enlarge
The PIP signal is sent from the ICM to the PCM, which will use the PIP signal to determine base ignition
timing and rpm calculations.
The ICM also receives the Spark Angle Word (SAW) signal from the PCM, which is used by the ICM to
calculate the proper spark timing advance. Once all of the signals are calculated, the ICM determines the
proper ON and OFF timing for the ignition coils.
The 4.0L engine utilizes one...

Page 198

ground) and the other plug is positive.
If, for some reason, a fault arises in the EI system, the Failure Mode Effects Management (FMEM) portion of
the ICM maintains vehicle operation. If the ICM stops receiving the SAW input signal, it will directly fire the
ignition coils based on the CKP signal. This condition results in a fixed timing of 10 degrees BTDC.
EEC-V Systems
The CKP signal is sent to the PCM, which uses the signal to determine base ignition timing and rpm
calculations.
The one missing...

Page 199

Recently a new class of DVOMs, referred to as True RMS DVOMs (such as: the Fluke® 87, 8060A,
8062A, etc.), are being used. True RMS DVOMs should not be used for the tests presented here. They
may display different voltage readings depending on whether the DVOM is first turned on and then the
test leads are attached, or if the leads are attached first, then the DVOM is turned on. Also they may
not auto range to the same range during each test, and some show different values depending on the
range...

Page 200

Test A-no start, part 2
Click to enlarge
HOW TO USE THIS BOOK
GENERAL SYSTEM TEST 189 
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