How do you check the ignition coil on a Jeep Cherokee?
Get a cheap 12 volt test light to make contact to the bare wire stuck in the back of the coil wiring harness plug. Turn the engine over like you are starting it. The test light should pulse for each time the PCM sends signal. It will be rather fast like a strobe light.
How does the ignition work on a Jeep Cherokee?
First, the key-switch engages the vehicle’s accessory systems like the radio. One click further activates the rest of the system, including the engine ignition, gauges and electric fans. Turning it further engages the momentary switch that sends power to the starter and turns the engine over.
Why does my Jeep 4.0L have no start?
CASE 2: Spark was NOT present in all of the cylinders (DISTRIBUTOR TYPE): This test result tells you without a doubt that the no start condition of your 4.0L equipped Jeep is due to a malfunction in the ignition system. Now, with no spark in any of the engine cylinders, this what I would suggest:
Why does my Jeep Cherokee not turn on?
Symptoms don’t get more straightforward than this: The truck doesn’t start. Turn the key, and everything comes on, but the driveway is absent of that Jeep rumble. When you turn the key, a number of things happen. First, the key-switch engages the vehicle’s accessory systems like the radio.
How to check engine code on Jeep YJ?
Using the ignition switch, at no point do you actually start the Jeep: Start with the ignition in the OFF position, Turn the key to ON, OFF, ON, OFF, ON stop .. leave the key in the ON position (Complete this sequence in under 5 seconds).
What should I know about my Jeep Cherokee ignition switch?
Sport Utility Vehicles come in all shapes and sizes, but your Cherokee never fails to stand out of the pack. By checking and maintaining your Jeep Cherokee ignition switch properly, you’re making an investment toward keeping your ride on the road longer and increasing the overall reliability and performance of your vehicle.
CASE 2: Spark was NOT present in all of the cylinders (DISTRIBUTOR TYPE): This test result tells you without a doubt that the no start condition of your 4.0L equipped Jeep is due to a malfunction in the ignition system. Now, with no spark in any of the engine cylinders, this what I would suggest:
How does the ignition coil work on a jeep?
The PCM (Powertrain Control Module = fuel injection computer) gets the crank signal and then activates the ASD (Auto Shut Down) Relay. Once this relay becomes activated, the ignition coil gets power (12 Volts). NOTE: The ignition coil only gets power with the engine cranking or engine running.
Can a spark test be done on a no start Jeep?
Testing for spark can very easily and safely be done with a dedicated spark tester. If the ignition system is the cause of the cranks but does not start condition, you’re not gonna’ see spark at any of the 6 spark plug wires or 6 COP ignition coils.