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...
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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...