96 Intrepid shut down

OLDTECH2

MECHANIC
1996 DODGE INTREPID

96 Intrepid 3.5L engine 4LE trans 105000 miles

Trans overhauled about 8000 miles ago with new solenoid pack. Has new cam, crank sensors. Also has new coil pack and pcm.

Car runs normally when cold. Once it warms up it shuts down. Shows code 43 indicating a loss of coil voltage. Shut down last night after test drive. Found the Automatic shut down relay disengaged. Manually jumped it and car started and ran normally. Traced the actuation wire for the relay to the pcm. It shows.3 ohms from one end to the other and open to ground. Have Haynes books on it, but their schematics are wrong.

Any ideas? It does have an alarm, but it's tied to the start circuit only. What triggers the shutdown relay? If it's the pcm, what triggers it?

Thanks

Found oem schematic for the car. OEM says the car isn't wired for 3.5 engine. Block, VIN, my eyes all agree that it's a 3.5. All parts over the life of the car (we've owned it since new) have been 3.5L. Checked the schematic for a 3.3. Schematic looks to match. Haven't checked all circuits yet, but the ones that I'm interested in match.

Still would like to know what makes the pcm turn the auto shutdown relay on and off.
Thanks

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Dunno about this model-Chrysler uses the ASD to power the coil and the fuel pump check these circuits.

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Saturday, May 26th, 2007 AT 4:57 AM

OLDTECH2

MECHANIC
64 POSTS

Finally found a set of schematics for the Interpid with the 3.5 engine that match what I see on the car.

Looking at the circuits, the problem is in either the key switch or the pcm. Had some hints of this problem with the original pcm, so I don't think that the reman pcm will be at fault.

ASD controls a number of 12v inputs on the engine. Including the coils. The ASD is directly controlled by the pcm. Backtracking the circuits, the problem will have to be in the ign switch. Working the next 2 days, so I'll be Wed getting back to it.

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Sunday, May 27th, 2007 AT 9:18 PM

OLDTECH2

MECHANIC
64 POSTS

Problem solved! According to the schematics, there is a.47 mf 250vdc, capacitor iin the green/orange stripe power wire for the coils. I was able to duplicate the problem with a hair drier and compressed air. Chrysler says that you have to replace the engine harness. I took a condenser from an old point ign and soldered it in place of the capacitor. Car has run fine since.

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Thursday, May 31st, 2007 AT 8:49 PM