Kohler ignition module test - Kohler CH25 PA-CH730-0040 Command Gasoline Engine

To test the ignition module on a 1995 GMC Sierra 5.7, you can follow these steps:
1. Safety Precautions: Ensure the vehicle is in park or neutral with the parking brake engaged. Also, disconnect the negative terminal of the battery to prevent any accidental electrical shock.
2. Locate the Ignition Module: The ignition module is typically mounted on the distributor or in close proximity to it. It is a small, rectangular component with electrical connectors and heat sinks.
3. Inspect the Wiring and Connections: Examine the wiring harness and connectors leading to the ignition module. Look for any signs of damage, corrosion, or loose connections. Ensure all connections are secure and in good condition.
4. Test the Ignition Coil: The ignition module works in conjunction with the ignition coil. You can test the coil by connecting a spark tester to one of the spark plug wires and grounding the tester. Have an assistant crank the engine while you observe if a spark is present. If there is no spark, it may indicate a faulty ignition coil or module.
5. Use a Multimeter: If the ignition coil tests fine, you can use a digital multimeter to test the ignition module. Set the multimeter to the resistance (ohms) setting. Disconnect the electrical connectors from the ignition module and measure the resistance between the appropriate terminals, as specified in the vehicle's service manual. Compare the readings to the manufacturer's specifications. If the resistance values are significantly different from the specified range, the ignition module may be faulty.
6. Consult a Service Manual: It's essential to refer to a detailed service manual specific to your GMC Sierra 5.7 for accurate testing procedures and specifications. The manual will provide step-by-step instructions and values for testing the ignition module.
If you are unfamiliar or uncomfortable with performing these tests yourself, it is recommended to seek assistance from a qualified automotive technician or a GMC dealership. They will have the expertise and specialized equipment to diagnose and repair the ignition system accurately.

This might help

A sheared flywheel key will not. This version of the Kohler CV employs fixed timing with a basic ignition module. A sheared flywheel key would not prevent spark but rather produce spark at the wrong time.

A simple test would be to disconnect the kill wire at the module and then check spark.

The module listed is JD MIU11542. They appear to be near symetrical and it may be possible (?) to install mirrored. The ignition module will not operate with a reversed field. Be sure to match the orientation of the working ignition module.

Comment for further assistance.

Yes most times except on systems with points. It be ungrounded except when you the ignition system killed.

First off, do not use a standard spark plug tester, Kohler uses a special one. Don't try and short the plug wire on the engine, doing either one of these tests will burn out the ign. mod. Make sure you use the plug that Kohler requires.

put 12 volts to the coil and see if it pulls in. Could be coil, idle module, ignition switch, or wiring. Get a 12v test light and trace it.

Get yourself a test spark plug for small engines

There is a small engine one & one for car with HEI
Ignition

Looks like a spark plug with an alligator clip on it

Look on the internet for one similar to KD 2757

Has to be for small engine & std ignition-- not electronic
ignition systems

weak spark could be a ground problem or it could be module itself check the wires that go to the module for nicks or cuts if none exist I would lean more toward the ignition module

I had this issue on my 14hp kohler and it was the ignition module. Would run until it heated up then shut down.

1989 Kohler 20 backfires through the exhaust. What are the possible causes?