GMC 19179578 Distributor Ignition Control Module Assembly

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To check the High Energy Ignition System (HEI), start by disconnecting the four-terminal connector from the distributor and test for a spark at the coil using a spark tester connected to the coil wire. If there is a spark, inspect the distributor cap, rotor, and coil wire for any damage or opens. In case there's no spark, remove the distributor cap and reconnect the four-terminal connector to the ignition control module. Unplug the two-wire connector from the distributor and check for voltage at the module positive (+) terminal of the two-wire connector with the ignition switch turned ON. Depending on the reading, follow the diagnostic steps to identify potential faults and replace the faulty components as necessary.For the removal of the distributor, disconnect the negative battery terminal, remove the distributor cap and rotor, and disconnect the electrical connectors from the ignition control module. Remove both module attaching screws and lift the module away from the distributor. If reusing the same module, avoid wiping off the grease from the module or distributor base. For installation, apply silicone grease on the module face and distributor base if using a new module. Install the module, attach both electrical leads, and then reinstall the distributor rotor and cap. Finally, reattach the cable to the negative battery terminal.For Enhanced Distributor Ignition (EDI) System check, examine the crankshaft sensor reference voltage and resistance, and inspect the crankshaft sensor circuit for any issues. To remove the EDI ignition control module, detach the negative battery cable, disconnect the ignition control module electrical connector, remove both module attaching screws, and lift the module from its mount. For installation, secure the module with screws and plug in the electrical connector. Reattach the cable to the negative terminal of the battery.For Distributorless Ignition System (DIS) check, perform the ignition system checks first. Then, disconnect the two-wire electrical connectors from the ignition control module and verify battery voltage on the pink wire. Check the resistance of the crankshaft sensor and circuit. Also, check the output voltage signal from the crankshaft sensor. If all the tests pass but there is no spark output at any of the coils, the ignition control module may be defective. If any system check findings are incorrect, diagnose the individual circuits and components.To remove the DIS system, detach the negative battery cable, label and disconnect all spark plug wires from the DIS assembly, unplug the electrical connector at the module, and remove the DIS and support bracket assembly. Unbolt and separate the coil and module assemblies, then detach the wires between the module and coil assemblies from the spade terminals on the underside of the coils. Unbolt the module from the support bracket. Installation is the reverse of removal, ensuring the wires are attached to the new module's coil assembly spade terminals in the same order as removed.

The knock sensor is liable for sensing irregular engine vibrations and minimizing spark knock. This results in a greater degree of AC output voltage, which is then given to ECM/PCM to retard the timing. Depending on the year and engine application, the location of this sensor can be different but normally it is found at the rear of the engine block or even at the side of cylinder head. For checking resistance of this sensor, remove electric connector and measure resistance between terminal and vital part of engine's body. If it falls outside this range, it should therefore be replaced. While running engine again, connect back connector and use voltmeter to verify an AC voltage signal here. Voltage ought to rise with increase in speed of an engine. If there is no any voltage signal available then knock sensor must be replaced because it has failed completely. When replacing this knock sensor just disconnect negative battery terminal before removing distributor or oil pressure sending unit if necessary; disconnect electrical connector and remove knocker from your engine block; installation is opposite to removal process. On 1988 -1995 models, ESC module located near throttle body however starting 1996 up to 2000 model years incorporated Knock Sensor Module with PCM as stated above; therefore remove PCM along with Knock Sensor Module cover also take out Knock Sensor by pinching retaining tabs & pulling up vertically straight; align tabs on notches press down until retaining clips snap into place for installing Knock Sensor Module while finally install PCM cover as well as Knock Sensor Module cover too.

Start the distributor removal processes by removing the rotor and distributor cap. If there is an internal capacitor within the distributors, you should remove module mounting screws and mounting screw for a capacitor. Then you can take ignition control module, capacitor and harness assembly from distributor base by separating it. Also disconnect wiring harness from ignition control module as well. Ignition control module should be removed by removing two screws also disconnecting the wire harness from it if your distributor does not have internal capacitors. Before installing, apply a layer of silicone lubricant on metal base of I.C.M (ignition control module). This grease works as an insulation between distributor and ignitor preventing failure of ignitor after its quick installation without the grease.

If no spark is present even after replacing the module, there may be a fault in the ignition coil.

The module can be tested with special equipment.

No, it is not necessary to remove the distributor from the engine for 1988 through 1995 models.

For models from 1996 to 2000, the knock sensor module is located in the PCM. To replace it, remove the PCM and the knock sensor module cover. Pinch the retaining tabs and pull the knock sensor straight up to remove it. To install the knock sensor module, align the tabs with the notches on the socket and press down until the retaining tabs click into place. Finally, install the knock sensor module cover and the PCM.

For EDI System check, examine the crankshaft sensor reference voltage and resistance, and inspect the crankshaft sensor circuit for any issues. To remove the EDI ignition module, detach the negative battery cable, disconnect the ignition module electrical connector, remove both module attaching screws, and lift the module from its mount. For installation, secure the module with screws and plug in the electrical connector. Reattach the cable to the negative terminal of the battery.

To remove the distributor, disconnect the negative battery terminal, remove the distributor cap and rotor, and disconnect the electrical connectors from the module. Remove both module attaching screws and lift the module away from the distributor. If reusing the same module, avoid wiping off the grease from the module or distributor base. For installation, apply silicone grease on the module face and distributor base if using a new module. Install the module, attach both electrical leads, and then reinstall the distributor rotor and cap. Finally, reattach the cable to the negative battery terminal.

To remove the distributor, disconnect the negative battery terminal, remove the distributor cap and rotor, and disconnect the electrical connectors from the module. Remove both module attaching screws and lift the module away from the distributor. If reusing the same module, avoid wiping off the grease from the module or distributor base. For installation, apply silicone grease on the module face and distributor base if using a new module. Install the module, attach both electrical leads, and then reinstall the distributor rotor and cap. Finally, reattach the cable to the negative battery terminal.

No, if the same module is to be reinstalled, do not wipe the grease from the module or distributor base.