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.
What to do if your Jeep Grand Cherokee has no spark?
Replaced the coil and nothing….replaced thermostat, found out it was stuck almost completely shut, engine barely had water in it. Started up fine a couple times then back to just cranking. Switched relay for fuel pump and ignition and starts up runs great then after about 20 minutes shut it off and back to just cranking again.
When did I start my Jeep Grand Cherokee ignition?
Ignition System Wiring Diagram (1993-1995 4.0L Jeep Grand Cherokee). Ignition System Wiring Diagram (1996-1998 4.0L Jeep Grand Cherokee). TIP 1: Two of the ignition coil tests in this tutorial require that you crank the engine… so, you’ve got to be careful and use common sense as you take all necessary safety precautions.
Is there a problem with my Jeep Grand Cherokee?
My 96 has the same problem and there’s no power to the coil and a changed the crankshaft sensor and still nothing the fuse box clicks and so does the evaporation canister 92 people found this helpful. my 97 Cherokee has the same problem many parts been replaced 49 people found this helpful.
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.
Ignition System Wiring Diagram (1993-1995 4.0L Jeep Grand Cherokee). Ignition System Wiring Diagram (1996-1998 4.0L Jeep Grand Cherokee). TIP 1: Two of the ignition coil tests in this tutorial require that you crank the engine… so, you’ve got to be careful and use common sense as you take all necessary safety precautions.
Where is the ASD relay on a jeep?
If you see battery voltage, check for ground on pin 85 in the relay socket. The PCM provides ground to the starter relay control coil AFTER it determines the anti-theft system has passed the authentication test. Remove the ASD relay from the power distribution center in the engine compartment.
How does the starter relay control coil work?
The PCM provides ground to the starter relay control coil AFTER it determines the anti-theft system has passed the authentication test. If the ASD is working properly, you should see battery power at the ASD terminal at the PCM. Remove the CMP and CKP electrical connectors.