Chevrolet 19179578 Distributor Ignition Control Module Assembly

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

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 responsible for detecting abnormal engine vibrations and reducing spark knock. It produces an AC output voltage that increases with the severity of the knock, which is then fed into the ECM/PCM to retard the timing. The location of the knock sensor varies depending on the year and engine application, but it is typically found on the rear of the engine block or the side of the cylinder head. To check the sensor's resistance, disconnect the electrical connector and measure the resistance between the terminal and the engine block. If the resistance is not within the specified range, the knock sensor should be replaced. To test the sensor's operation, reconnect the connector and use a voltmeter to check for an AC voltage signal while the engine is running. The voltage should increase as the engine speed increases. If no voltage signal is present, the knock sensor should be replaced. When replacing the knock sensor, disconnect the negative battery terminal and remove the distributor or oil pressure sending unit if necessary. Disconnect the electrical connector and remove the knock sensor from the engine block. Installation is the reverse of removal. For models from 1988 to 1995, the ESC module is located near the throttle body. Disconnect the negative battery terminal and detach the electrical connector from the module. Remove the mounting screws and detach the module. Installation is the reverse of removal. For models from 1996 to 2000, the knock sensor module is located in the PCM. 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.

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.

To remove the distributor, start by removing the distributor cap and rotor. For distributors with an internal capacitor, remove the module mounting screws and the capacitor mounting screw, then separate the ignition control module, capacitor, and harness assembly from the distributor base and disconnect the wiring harness from the ignition control module. For distributors without an internal capacitor, disconnect the wiring harness from the ignition control module, remove the two mounting screws, and remove the ignition control module. To install, apply a layer of silicone lubricant to the metal base of the ignition control module before installing it. The grease acts as insulation between the distributor and the ignition control module, preventing the ignition control module from failing quickly if installed without it.

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