Welcome to Allpar. This PCM wiring diagram should be similar.
The Rd/Wt wire at the PCM should have battery 12v power.
The Dk.Bu/Wt should have ignition on 12v power.
There are distributed (Bk/Wt and Bk/Tn) grounds to body ground.
In the top, left corner more PCM pin outs are shown including your starter relay with the Bn/Yl ground return wire.
This isn't a Chrysler wiring diagram and no year is stated, but I hope it is accurate.
If a 5 volt or 8 volt sensor supply voltage (Bk/Lt.Bu or Or) is shorted to ground, the PCM will go into 'protection' with no 'ck eng' light or scan tool communication. This short can be at the wiring harness (cuts and rub-throughs against a sharp corner were fairly common) or the sensor short-to-ground itself. You can unplug one sensor at a time followed by a key cycle (reset) until the PCM resumes operation. Or possibly the PCM itself is failed.
Engine_Electrical.jpg
The Rd/Wt wire at the PCM should have battery 12v power.
The Dk.Bu/Wt should have ignition on 12v power.
There are distributed (Bk/Wt and Bk/Tn) grounds to body ground.
In the top, left corner more PCM pin outs are shown including your starter relay with the Bn/Yl ground return wire.
This isn't a Chrysler wiring diagram and no year is stated, but I hope it is accurate.
If a 5 volt or 8 volt sensor supply voltage (Bk/Lt.Bu or Or) is shorted to ground, the PCM will go into 'protection' with no 'ck eng' light or scan tool communication. This short can be at the wiring harness (cuts and rub-throughs against a sharp corner were fairly common) or the sensor short-to-ground itself. You can unplug one sensor at a time followed by a key cycle (reset) until the PCM resumes operation. Or possibly the PCM itself is failed.
Engine_Electrical.jpg