Mercury E6SZ-12A297-A Module - Ignition

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The ignition control module is a delicate and relatively expensive electronic component, and improper procedures could lead to damage to the module or other electronic devices, including the EEC-IV microprocessor. Check with your dealer about the Federally mandated extended warranty on devices under computer control before attempting to diagnose and replace the module yourself. Note that certain models use a special DuraSpark II ignition control module with altitude compensation features for spark timing and engine performance at high altitudes. An intermittent no-start condition may occur in some years and models of SSI and DuraSpark ignition systems, where the engine starts momentarily and shuts down instantly or runs the duration of a trip but won't restart afterward. Striking the module or applying heat won't fix it, confirming the ignition control module as defective. To check the ignition control module on DuraSpark systems, examine power to the module, resistance of the distributor stator, and ground circuit continuity. For TFI-IV ignition control modules, inspect power, resistance between terminals, and the PIP to SPOUT circuit. Always ensure safety measures when working with the ignition system. For ignition control module replacement, detach the negative battery cable, unplug electrical connectors, remove mounting screws, and replace the module or stator. Reassemble components following the reverse order of removal and use appropriate lubrication or dielectric grease when specified.

The ignition control module is a delicate and relatively expensive electronic component, and improper procedures could lead to damage to the module or other electronic devices, including the EEC-IV microprocessor. Check with your dealer about the Federally mandated extended warranty on devices under computer control before attempting to diagnose and replace the module yourself. Note that certain models use a special DuraSpark II ignition control module with altitude compensation features for spark timing and engine performance at high altitudes. An intermittent no-start condition may occur in some years and models of SSI and DuraSpark ignition systems, where the engine starts momentarily and shuts down instantly or runs the duration of a trip but won't restart afterward. Striking the module or applying heat won't fix it, confirming the ignition control module as defective. To check the ignition control module on DuraSpark systems, examine power to the module, resistance of the distributor stator, and ground circuit continuity. For TFI-IV ignition control modules, inspect power, resistance between terminals, and the PIP to SPOUT circuit. Always ensure safety measures when working with the ignition system. For ignition control module replacement, detach the negative battery cable, unplug electrical connectors, remove mounting screws, and replace the module or stator. Reassemble components following the reverse order of removal and use appropriate lubrication or dielectric grease when specified.

To remove the heatsink assembly, unscrew or unbolt it from the radiator support bracket on non-supercharged models or the belt pulley bracket on supercharged models. On non-supercharged models, remove the two screws holding the ignition control module to the heatsink. Disconnect the electrical connector from the ignition control module. Before installation, coat the metal baseplate of the ignition control module with silicone dielectric compound WA-10, D7AZ-19A331-A or equivalent. To reinstall, follow the reverse of the removal procedure.

Duraspark II Ignition Control Module checks include verifying power, checking distributor stator resistance, and ensuring ground circuit continuity. If battery voltage doesn't reach the module, trace the circuit to the ignition switch and battery. Incorrect test results mean the module should be replaced, involving detaching the battery cable, unplugging connectors, removing screws, and installing a new module. TFI-IV Ignition Control Module checks include inspecting and reconnecting ignition wiring, testing the ignition coil circuit, and checking module power. Resistance checks should be performed between specific terminals. Incorrect results require module replacement, involving removing the distributor and module, and installing a new one. EDIS Ignition Control Module checks involve inspecting and reconnecting coil wiring, testing the coil circuit, and checking module power. Resistance checks should be performed on the crankshaft sensor. Incorrect results require module replacement, involving disconnecting the battery cable and electrical connector, removing screws, and installing a new module.

The negative battery cable must be disconnected. One has to detach the wiring harness connector(s) from the ICM. The ICM should be removed by taking out the mounting bolts. To reinstall, put the ICM into position and mount it using the bolts. Tighten the bolts to 22-31 inch lbs. Attach the wiring harness connector(s) to the ICM. Connect negative battery cable.

Disconnect the negative battery cable. Label and detach all wiring from the ICM. If the module is mounted to the inner fender, remove the ICM/heat sink-to-fender apron bolts, then remove the ICM/heat sink. If the module is mounted to the intake manifold, remove the ICM/heat sink-to-intake manifold bolts, then remove the ICM/heat sink. If necessary, at this time the ICM can be removed from the heat sink. 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. Install the ICM onto the heat sink. Tighten the mounting bolts to 15-35 inch lbs. (1.7-4.0 Nm). Position the ICM onto the right-hand, front fender apron or intake manifold, then install and tighten the mounting bolts to 90-120 inch lbs. (10-14 Nm). Attach all wiring to the ICM, then connect the negative battery cable. Disconnect the negative battery cable. Remove the distributor assembly from the engine. Place the distributor on the workbench and remove the module retaining screws. Pull the right side of the module down the distributor mounting flange and back up to disengage the module terminal from the connector in the distributor base. The module may be pulled toward the flange and away from the distributor. Coat the base plate of the TFI ignition module uniformly with 1/32 inch of silicone dielectric compound WA-10 or equivalent. Position the module on the distributor base mounting flange. Carefully position the module toward the distributor bowl and engage the three connector pins securely. Install the retaining screws. Tighten to 15-35 inch lbs. (1.7-4.0 Nm), starting with the upper right screw. Install the distributor into the engine. Install the cap and wires. Reconnect the negative battery cable. Recheck the initial timing. Adjust if necessary.

Before replacing ignition system components, check with your dealer service department to see if your vehicle qualifies for a Federally mandated extended warranty of 5 years or 50,000 miles. For vehicles with Electronic Engine Control (EEC), be aware t hat disconnecting the battery may cause the Powertrain Control Module (PCM) to lose its memory, resulting in abnormal driving symptoms for the first 10 miles or so until the PCM relearns its adaptive strategy.

The special DuraSpark II ignition module has altitude compensation features for spark timing and engine performance at high altitudes.

Disconnect the electrical connector from the module.

For the TFI-IV ignition control module (distributor-mounted or remote-mounted), follow the specified steps for removal and installation. Apply silicone dielectric grease to the back of the module before installing it.