Lingenfelter L460285297 & L460316109 Lingenfelter LNC-TRM Torque Reduction Module v1.2 - Manual (Page 14)

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Troubleshooting:
• Intermittent misfire or other erratic vehicle operation.
• Have someone monitor the LED’s on the LNC and note what they are doing when the problem
occurs. Try changing the settings on the LNC. Does the problem still occur and, if so, to the
same extent and for the same duration?
• Disconnect the digital activation input or the analog signal input and retest (leaving the LNC
connected to the coil packs)
• Does the problem still occur?
• If no, the problem is likely coming from the activation input.
• Check for an erratic activation signal or electrical noise on the activation input. Are
you using a microswitch or momentary switch? Bypass this device to confirm that it
isn’t giving you erratic activation signals. Are you using a mechanical relay in a high
vibration/acceleration environment? If so, try switching to a solid state relay.
• If the problem still occurs, disconnect the LNC from the vehicle completely (activation,
and coils) and test again.
• If the problem still occurs, it is not related to the LNC.
• If the problem goes away, re-install the LNC and test the following:
• Re-route the LNC wiring harness away from the spark plug wires and/or ignition
coils.
• Make sure the wires are not run in parallel with electrical wiring including fuel
injector harness wires or nitrous solenoid wires.
• Mount the LNC in a different location.
• If you are using aftermarket spark plug wires, try changing back to the stock
spark plug wires or a different brand of spark plug wires. Make sure you are
using noise suppression spark plug wires.
• If you are using aftermarket/non OEM spark plugs, confirm that they are really a
resistor type plug.
• If you can’t get resistor spark plugs in the heat range or design you need, try
installing resistor type spark plug boots on your spark plug wires (available
from NGK)
• No power LED on LNC/no vehicle start up
• Try disconnecting everything and plugging it all back in - you may have corroded or loose
connections. Inspect all connectors and wires for damage and wear.
• Torque reduction always active or torque reduction not working
• Check what the LED’s on the LNC are doing when the torque reduction should become active
• Make sure that the LNC ground activation wire is not connected to an “always on” ground. This
connection is not a module ground but an activation ground.
• Make sure you don’t have the yellow and green activation wires connected directly to each other
- this will cause the LNC to either be active on each key up cycle, or if the “Kill Time” is set to
“F”, to always be on.
• Check what the voltage levels are at the red, black and purple wires
• Check what the Applied Retard output signal using a volt meter on the gray analog out wire.