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

The ICM is mounted on the top part of the 4.6L rear camshaft cover and is responsible for the following functions In addition to monitoring ON-OFF pulses from the crankshaft and camshaft position sensors, is responsible for generating a camshaft reference signal for controlling the ignition and fuel injection as well as providing the PCM with a ground reference and allowing the PCM to vary the amount of spark advance. The ICM is nonrepairable, and when replacing the module, the remaining components are transferred to the new one. To perform the removal of the ICM, spark plug wires and four electrical connectors must be disconnected, four bolts illustrated in the steps that hold the module to the rear camshaft cover must be unbolted, module assembly has to be taken out of the vehicle and ignition coils removed from the assembly. Last of all, unscrew the ICM from the assembly bracket. The steps for installation are the reverse of the steps for removal.

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.

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.

4.3L (2014 and previous years) V6, 5.0L/5.7L/7.4L V8 engines are only covered by this procedure. Firstly, remove the engine cover. In addition to that, you can separate the air intake duct or resonator from the throttle body if you still need more space to work on your vehicle. On the right side of the manifold's intake is a bracket wherein ignition coil is also mounted and aside of which there is ICD module or ICM in 4.3L V6 engines (2014 and previous models) as well as in 5.0/5.7L V8 engines. The ignition coil and mounting bracket for the ICD module (or ICM) that are used on 7.4L V8s are nearly identical to those used on the smaller V8s and V6s; however, they are positioned behind the distributor at the rear of the manifold. If you want to replace an ignition control module on most of these engines, you should try removing it without dismounting an ignition coil mounting bracket from an engine block. However, if it is easier for you to remove them together, you can take out a control module along with a coil and mounting bracket as a single unit; otherwise, just detach it from a bracket or leave it attached to other parts of your car's ignition assembly till further steps are taken care of. Afterward, unplug all electrical connectors from the ignitions control modules before proceeding any further with repairs on this part of your automobile's engine system-this will help protect both yourself and anyone else who might be working nearby at this time; additionally, always be cautious when handling any such devices because they usually have very high voltage levels inside them which can easily electrocute someone even when they appear harmless externally like these small black boxes here which were used as examples above. Finally, remove the ignition control module mounting screws and take the module off of the coil/module mounting bracket. Now put everything back together again just like it was before but this time install that heat sink too otherwise this will not work correctly even though you've got a new one there now.

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.

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.

Remove the air filter assembly or the air intake duct and resonator, depending on the system.

For DIS System check, perform the ignition system checks first. Then, disconnect the two-wire electrical connectors from the ignition 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 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.