Gen 2 Viper Engine Help

[53Vipette]

I'm now at the point of getting firing my Viper motor for the first time. I was curious if anyone could help with some issues I've had so far. I'm running Mopar's Viper Crate Motor ECM and Harness on Gen 2 motor. So far the engine cranks but there's no spark or fuel. I did hear the injectors fire once but that was it. I found a wiring diagram for the ECM and pinned out everything to check that there's continuity between the ECM and the sensors and that seems to check out okay. I did replace the cam sensor and crank sensors with spares I had and no change.

The Build:
https://www.pro-touring.com/threads/89377-53-Plymouth-Belvedere-Build

ECM:
http://viperspecialtyperformance.com/catalog/product_info.php?cPath=74_84&products_id=251

PCM Wiring Diagram
http://www.innovatemotorsports.com/resources/ecu/Dodge%20Viper%201996%20-%202002.pdf

[sccacuda]

Make sure the ASD circuit is powered and working. You'll need to make sure you have a relay in the circuit, I'm assuming the harness had this. The relay coil will have power for a sec on key on and then continuously during crank and start. This is what provides power to the injectors.

[53Vipette]

Make sure the ASD circuit is powered and working. You'll need to make sure you have a relay in the circuit, I'm assuming the harness had this. The relay coil will have power for a sec on key on and then continuously during crank and start. This is what provides power to the injectors.


I'll go check right now, if it doesn't what should I look for?

[53Vipette]

Make sure the ASD circuit is powered and working. You'll need to make sure you have a relay in the circuit, I'm assuming the harness had this. The relay coil will have power for a sec on key on and then continuously during crank and start. This is what provides power to the injectors.

Okay I just checked the relay and I've got power. I can feel it cycle if I turn the key on and off.

[sccacuda]

Okay, I'm assuming you don't have a scan tool that can read data? Unplug the cam sensor and see if it will start. You'll have to crank it a little longer to fire with this sensor unplugged.

[53Vipette]

I was curious if I had the wrong timing gear. The old one we took out has 50/50 high low and this one that's in there now has a high spot that I can feel. I'm not sure if I've got an earlier gen 1 gear in there.

[sccacuda]

I was curious if I had the wrong timing gear. The old one we took out has 50/50 high low and this one that's in there now has a high spot that I can feel. I'm not sure if I've got an earlier gen 1 gear in there.

Gen 2 gear will have the raised portion for the sensor that goes 180 degrees around the gear, same as Gen 3, but the timing marks are different. Here is a Gen 3 gear and looks very close to the Gen 2, but has three bolts. The Gen 2 is a single bolt gear.

https://static1.pt-content.com/images/pt/2016/04/IMG_0517_zpsdinzcfwo-1.jpg (http://s1060.photobucket.com/user/340cuda/media/IMG_0517_zpsdinzcfwo.jpg.html)

This is what a Gen 3 sounds like with a little more cam:

https://youtu.be/F6oah6BDPFU

[53Vipette]

I tried disconnecting the Cam sensor with no luck. I cranked it for maybe 7 seconds and nothing. I pulled the front cover off to check to see if the cam gear was in fact correct and I will take pics and show them to you to verify. I'm not sure if it's something simple I'm missing or the ECM is in fact damaged. Is there any way I could call you later? I don't live very far from you as I am currently in Marianna, Fl.

[sccacuda]

Sure.

[53Vipette]

Sure.

So I reinstalled the front cover and installed a new cam sensor to find that the signal changes as the engine cranks. I used a mulitmeter to see a rise and fall of 5v. I haven't gotten the scan tool yet but I'm hoping this week I can get something. Also I noticed that I have 5v on two of the three pins which didn't seem right.

[sccacuda]

Can't use a multimeter to see a square wave. DVOM's average voltage. So you should not see voltage rise and fall. You have a ground, signal, and 5v reference on the cam sensor connector. The signal will show 5v unplugged. The PCM uses a pull up resistor on this circuit to have the ability to code for an open and shorted circuit, hence the 5V when unplugged. You need a scan tool with data at the very least and an oscilloscope to verify waveform.