GM 19352931 Module Asm,Electronic Ignition Control (W/O Coil)

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To check or replace the Ignition Control Module without removing the distributor, start by disconnecting the tachometer lead (if equipped) at the distributor and then check for a spark at the coil and spark plug wires. If there's no spark, remove the distributor cap and take out the Ignition Control Module from the distributor while leaving the connector plugged in. With the ignition switch turned On, check for voltage at the Ignition Control module's positive terminal; if it reads less than ten volts, there might be a fault in the wire between the Ignition Control module's positive terminal and the ignition coil's positive connector or the ignition coil's primary circuit to the ignition switch. If the reading is ten volts or more, check the "C" terminal on the Ignition Control Module; if it's less than one volt, there may be an issue with the distributor-to-coil "C" terminal connection, the ignition coil, or an open primary circuit in the coil itself. If the reading is one to ten volts, replace the Ignition Control Module with a new one, and if there's now a spark, the Ignition Control Module was faulty. If no spark is present, there may be a fault in the ignition coil. To proceed, unplug the pick-up coil connector from the Ignition Control Module and check the "C" terminal voltage with the ignition switch On while observing the voltage reading when a test light is momentarily connected between the battery positive terminal and the Ignition Control module's "P" terminal for five seconds or less. If there's no drop in voltage, check the Ignition Control Module ground, and if it's good, replace the Ignition Control Module with a new one. If the voltage drops, check for spark at the coil wire as the test light is removed from the Ignition Control Module terminal. If there's no spark, the Ignition Control Module is faulty and should be replaced, but if there's a spark, the pick-up coil or connections may be faulty or not grounded. For Ignition Control Module replacement, first disconnect the battery's negative terminal, remove the distributor cap and rotor, take out both Ignition Control Module attaching screws, and lift the Ignition Control Module away from the distributor. Disconnect both electrical leads from the Ignition Control Module, ensuring they are not interchanged. When reinstalling the same Ignition Control Module, avoid wiping the grease from the Ignition Control Module or the distributor base. If a new Ignition Control Module is used, apply the included silicone grease on the Ignition Control module's face and the distributor base where the Ignition Control Module seats for heat dissipation. Finally, install the Ignition Control Module, attach both electrical leads, install the distributor rotor and cap, and reattach the battery's negative terminal.

For EDI System check, examine the crankshaft sensor reference voltage and resistance, and inspect the crankshaft sensor circuit for any issues.

To replace the ignition control module on a vehicle, start by disconnecting the cable from the negative battery terminal. Then, access the distributor by removing the air filter assembly or the air intake duct and resonator, depending on the system. Next, remove the distributor cap and wires as an assembly, followed by the rotor. Carefully detach the wires from the module terminals and remove the screws to lift out the module. For 1988 through 1995 models, it is not necessary to remove the distributor from the engine. However, for 1996 through 2000 models, the ignition control module can be removed without removing the coil bracket. Once the module is removed, it can be tested with special equipment if there are suspicions of malfunction. To install the new module, apply silicone dielectric grease to the bottom of the ignition control module, as it dissipates heat and prevents overheating. Finally, reconnect the electrical connector and secure the module with mounting screws.

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.

After disconnecting the electrical connector, the ignition control module mounting screws should be removed and the module should be removed from the coil/module mounting bracket.

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.

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.