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Troubleshooting a no start situation with the 6010 and 6012 LSx motor controllers


 

Troubleshooting a no start situation with the 6010 and 6012 LSx motor controllers-

 

 

 

The best place to start with these units is power and ground. If power and ground are in question, it would be in the best interest of the person performing the troubleshooting to run the pink wire directly to the battery (+) and the black and gray wires directly to the battery (-). Make sure that the motor has a direct connection (heavy gauge wire like a 0 or 00) to the battery (-) terminal as well. You can go as far as checking for continuity from the pink wire that is connected to 12v source to the pink wire on each connector to ensure that there are no breaks in the conductor.

 

Testing without a laptop connected or with a non-programmable unit-

 

 

 

Start with the power and ground procedure. Crank the motor over for further troubleshooting. If the motor is back firing through the carburetor or the exhaust go to section A. If the motor isn’t doing anything, pull a spark plug out and lay it near a ground. Crank the motor over and check for spark. If there isn’t any spark at the plug skip to section B.

 

 

A.)  If the motor is back firing through the carburetor or exhaust, there is a good possibility that the problem is related to the cam sensor. The LSx motor has a 50% chance of starting each time you crank on it even if the cam sensor has failed. First verify that you have the correct cam sensor installed on your motor. The LS1, LS6, and early LS2 motors have a black cam sensor that works off of a 12v reference signal. The late LS2 and LS7 motors have a set of gray cam sensor that works off of a 5v reference signal. You may want to verify that there is continuity between the pink, solid brown and brown/white wire on the cam sensor harness and the main harness that plugs into the controller. If this checks out, replace the sensor.

 

 

B.)   If the motor isn’t producing spark from the spark plug, first verify that you have the correct crank sensor. The LS1, LS6, and early LS2 motors use a 24x reluctor with a black crank sensor. The LS2 (late), and LS7 motors have a grey 58x reluctor. With a tach connected to the tach output wire spin the motor over for approximately 20-30 seconds and check for activity on the tach indicating on the tach. There should be a reading of approximately 150-250 RPM during cranking. If no tach is available you can probe the tach output wire with a voltmeter for DC voltage and check for some type of voltage fluctuation indicating some type of RPM activity. If there isn’t any tach signal, the crank sensor may need to be replaced. If the motor has been rebuilt, there is a possibility that the reluctor mounted on the crank has been damaged. You may need to replace the crank sensor and/or the reluctor at this point.

 

Testing with a laptop connected to a programmable unit-

 

 

Start with the power and ground procedure. With the laptop connected and the MSD Graphview software connected, verify that under the product connected screen, the MSD ignition is connected and communicating properly. If the software states the product connected is “None” or “Loopback test” the unit isn’t communicating properly or the laptop isn’t configured properly. (To solve a “Loopback” or “None” problem, contact the MSD tech support line @ 915-855-7123 for further troubleshooting on that problem.)

 

            Disconnect both 7 pin coil connectors from the MSD main harness which connect to the coil pack harnesses. Have someone crank the motor over for 25-30 seconds.

 

1.) While the motor is being cranked by another person, verify that the MSD Graphview software product connected screen continues to state that the unit is still connected, if the software switches from the 6010v01 M01 (or similar) to “None” the unit is loosing power or ground under load, go back and check the power and ground procedure. Then check to make sure that the battery voltage on the monitor is reporting battery voltage and no less than 9v when the motor is cranking. If this checks out fine, go ahead and move to the next section.

 

2.) With the motor cranking over check for RPM (between 150-250 RPM). If there isn’t any RPM, the crank sensor may need to be replaced. If the motor has been rebuilt, there is a possibility that the reluctor mounted on the crank has been damaged. You may need to replace the crank sensor and/or the reluctor at this point.

 

3.) If you have a cam signal error reported in the Monitor screen, there is a good possibility that the problem is related to the cam sensor. The LSx motor has a 50% chance of starting each time you crank on it even if the cam sensor has failed. First verify that you have the correct cam sensor installed on your motor. The LS1, LS6, and early LS2 motors have a black cam sensor that works off of a 12v reference signal. The late LS2 and LS7 motors have a set of gray cam sensor that works off of a 5v reference signal. You may want to verify that there is continuity between the pink, solid brown and brown/white wire on the cam sensor harness and the main harness that plugs into the controller. If this checks out, replace the sensor.

 

 

You can check the trigger signal for the coils with a scope. The 4 color striped wires to the coil connector are triggering the coils with a 5v signal. The solid black and solid brown wires are ground and the solid pink wire is 12v. With a scope you should see a 0-5v square wave signal (narrow pulse) 5vDIV/5ms. You can also set it at 2vDIV/10ms.

 

Check the tach signal wire with a scope 10DIV/50ms to verify RPM signal.

 

Cam signal wire brown/white wire 5vDIV/200ms. Square wave 50ms wide.