2008 Dodge Caravan Crank but No Start

jomills · 2021-01-12T10:40:10+00:00

hello, i have the van listed above, it was misfiring and giving codes of p0300, p0203 and p0303. if remember correctly it had something to do with the fuel injector wiring. i changed out the wiring harness for the fuel injectors and now it won't fire. i tested the spark plug for spark and it is there. The plugs were wet so it seems to have fuel. it was running before the harness swap, but poorly and now it won't fire. it has a new, strong battery, i replaced the cam position sensor and the coil pack and the relays seem to be okay. what do you think?

STRAILER

✓Experienced Mechanic
55,309 POSTS

If you have a shorted injector it can cause the PCM to go full on causing the engine to flood. How wet are the plugs? Also does the system have spark? This guide can help us see what's going on:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Let us know what happens and please upload pictures or videos of the problem.

Jan 13, 2021 at 2:07 AM

JOMILLS

MEMBER
5 POSTS

thanks Ken.
the plugs were pretty wet. the plugs have spark. if the PCM was stuck full on, how would i know?

Jan 13, 2021 at 6:54 AM

STRAILER

✓Experienced Mechanic
55,309 POSTS

The plugs will be dripping wet. Lets remove the injectors and use this guide to test them:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Can you please shoot a quick video with your phone so we can see what's going on? that would be great. You can upload it here with your response.

Jan 14, 2021 at 12:38 AM

JOMILLS

MEMBER
5 POSTS

Thank you sir.
I’ll work on that trouble shooting this weekend when i have time.

Jan 14, 2021 at 1:30 AM

STRAILER

✓Experienced Mechanic
55,309 POSTS

Please let us know what you find. We are interested to see what it is.

Jan 15, 2021 at 1:28 AM

JOMILLS

MEMBER
5 POSTS

hello Ken,

i checked voltage coming to the fuel injector plug and it never got above 5 volts.

Jan 21, 2021 at 5:30 AM

STRAILER

✓Experienced Mechanic
55,309 POSTS

hmm, it should be 12 volts. it sounds like the PCM has gone out. To be sure lets do a CAN scan which is the future of automotive repair. you can get a CAN scanner from Amazon for about $50.00. here is a video to show you how:

https://youtu.be/InIlnsjOVFA

Here is the location of the PCM and replacement instructions I would check the electrical connector for corrosion. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Jan 22, 2021 at 2:33 AM

JOMILLS

MEMBER
5 POSTS

hello Ken,

can you recommend a can scanner that can do this? i am not certain of what i need.

thank you.

Feb 5, 2021 at 1:11 AM

STRAILER

✓Experienced Mechanic
55,309 POSTS

this will work:

https://www.amazon.com/gp/product/B007XE8C74/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B007XE8C74&linkId=6ce6162b02db9e7d896854b59e1837be

let me know.

Feb 5, 2021 at 2:43 AM

crank but no start