Question about Cars & Trucks
Trying to locate the g.e.m module
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Posted on Jan 02, 2017
Posted on Feb 27, 2009
It does not have an ignition control module.
The electronic ignition (EI) for the 4.0L engine consists of the following components:
Crankshaft position sensor (CKP sensor) and 36 minus 1 tooth trigger wheel.
Ignition coil .
powertrain control module (PCM) .
The PCM controls the firing of the coil based on the signal from the crankshaft position sensor.
The crankshaft position sensor (CKP sensor) is a variable reluctance-type sensor, triggered by a 36 minus 1 tooth trigger wheel configuration machined into the rear of the crankshaft vibration damper. The signal generated by this CKP sensor is called a CKP signal. The CKP signal provides the base timing and rpm information to the powertrain control module (PCM). Base timing is set at 10 degrees BTDC and is not adjustable.
If vehicle has no spark then turn key to on position,check engine light should come on.As you start cranking engine it should go out while cranking after about 10 secs. it should come back on(while cranking). If it come on then the PCM sees the signal,if it does not then PCM is not seeing it and this is your problem,either the CKP sensor or the wiring to it.
Posted on Mar 16, 2009
It does not have an ignition control module. The PCM (powertrain control module) fires the coil pack based on signal it recieves from the crankshaft position sensor and the camshaft position sensor.
Posted on Apr 08, 2009
You probably have a door ajar switch that is bad. You can check the grounds coming from the switch that goes to the gem module and it should change from open to ground when you open and close the door. If you really think the gem module is bad or want to check it with your scematic. The gem module should be piggy backed behind the fuse panel inside your pick if you remove the fuse panel inside your truck you should be able to access the module but you have to remove the fuse panel completely from the truck to remove the gem module. Good luck with your problem.
Posted on Apr 17, 2009
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