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Jon
Jon, ASE Certified Technician
Category: Dodge
Satisfied Customers: 310
Experience:  Master Chrysler/Jeep/Dodge Tech
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03 Dodge R1500-Crank but no start

Customer Question

03 Dodge R1500-Crank but no start
Submitted: 1 year ago.
Category: Dodge
Expert:  Jon replied 1 year ago.

Hi, have you checked for fuel pressure yet?

Customer: replied 1 year ago.
I don't have spark or injury pulse
Customer: replied 1 year ago.
Sorry injection pulse
Expert:  Jon replied 1 year ago.

Ok, what engine is in your ram so I can give you the correct wire colors to test?

Customer: replied 1 year ago.
4.7l. I have tested the wires from each sensor to ecm and have good continuity
Expert:  Jon replied 1 year ago.

Ok, at any injector or coil check for power at the dark green/orange wire when you first turn the key to run. It should get hot for about 2 seconds when you first turn the key to run.

Customer: replied 1 year ago.
Getting 12.9v
Expert:  Jon replied 1 year ago.

Ok, is it still flagging a code for the crank sensor? That last test shows ASD is coming on, then it has to see RPM from the crank sensor to stay on.

Customer: replied 1 year ago.
No codes also no rpm on scanner
Expert:  Jon replied 1 year ago.

With the key in run, do you have 5 volts at the orange wire of the crank position sensor? The violet/white is the 5 volt supply to the cam position sensor, check that also please.

Customer: replied 1 year ago.
4.99v
Expert:  Jon replied 1 year ago.

Does your scanner show the cam and crank signals? It would be even better if you have a lab scope. that's the best way to check a crank signal.

Customer: replied 1 year ago.
No signals on either
Expert:  Jon replied 1 year ago.

But your scanner does have a PID for them I'm asking and they both show no signal?

Expert:  Jon replied 1 year ago.

http://www.amazon.com/SainSmart-Upgraded-Pocket-Sized-Handheld-Oscilloscope/dp/B004Y3QHZ6/ref=sr_1_2/176-1213250-6939558?ie=UTF8&qid=1441920219&sr=8-2&keywords=lab+scope

You can get scopes fairly cheap now if you don't have one. This way you could see if the 5 volt square wave is getting to the pcm.

Customer: replied 1 year ago.
I can borrow one but it won't be until tomorrow
Expert:  Jon replied 1 year ago.

Ok, does your pcm have 3 or 4 connectors? That's a borderline year for JTEC vs. NGC.

Customer: replied 1 year ago.
4 connection
Expert:  Jon replied 1 year ago.

Ok, the 2nd connector from the left, pin 34 is the cam signal and 35 is the crank signal. When you scope those 2 pins, you should see a steady 5 volt square wave pattern when the engine is cranking.

Customer: replied 1 year ago.
OK will update you
Expert:  Jon replied 1 year ago.

ok sounds good