ThunderMax Throttle Loss - How Diagnose and Repair User Manual
Throttle by wire tps and tgs diagnostic codes
Throttle By Wire TPS and TGS Diagnostic Codes
Two sensors provide information to the ECM to control the throttle.
TPS = Throttle Position Sensor
TGS = Throttle Grip Sensor (Throttle twist grip)
If either of the sensors becomes faulty, the ThunderMax ECM places the throttle into one
of two for safety modes.
Engine RPM is reduced to “Idle Only”
Engine RPM is set to “Limited Performance Mode (Limp home)”
NOTE: This is not a “fault” within the ThunderMax ECM. The ThunderMax ECM is
responding to sensor faults on the motorcycle for rider safety.
The following link describes methods of diagnosing this condition
Recommended Maintenance Procedure to correct loss of throttle.
Locate the TCA connector (back side of the Throttle Body)
Disconnect the TCA connector
Inspect the TCA connector pins
NOTE: If your TCA connector pins are severely fretted or damaged then repair
is required***.
Clean and apply a light coat of dielectric grease to the connector.
Securely connect the TCA connector making sure it LOCKS into place.
***H-D dealer offers an updated pin released in 2011 (Part # 72663-11) These
new pins are made from silver to enhance conductivity to the TCA.
If you continue to experience loss of throttle control with stored DTC's for TGS and
TCA functions, you likely have a wiring problem with the TGS circuit in the
handlebars. TGS problem are commonly due to faulty wiring during a handlebar
change.