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198 Chrysler

48RE“Diesel Only” Throttle Valve Actuator Circuit Test ECM “Connected”After relearn, note TTVA “closed throttle” % on scan data. Closed throttle it needs to be between 2%-22% and increase to above 48% at full throttle. If you do not get this increase, unbolt the TTVA and do the relearn and do the relearn “off the transmission”. Now the percentage at full throttle must go above 51% to assure that the TTVA is good.

The TTVA Position Sensor Signal is a 5V potentiometer that works similar to a TPS sensor. As the motor sweeps this voltage will change from less than 1 volt to 4.5 volts during the sweep at C2 pin 27. If there is a signal problem here, unplug the TTVA and jump the 5V reference wire “pin 2” to ground wire “pin 6” and with scan data verify that you now get a code for short to ground on 5V circuit. Voltage in ground will affect this signal return voltage.