Code B671, Cruise Servo Position Sensor Circuit: Notes

Fig 1: Code B671, Wiring Diagram (Reatta & Riviera) Cruise Servo Position Sensor Circuit

Fig 2: Code B671, Wiring Diagram (Toronado) Cruise Servo Position Sensor Circuit

Code B671 will set if ignition is on and the servo position sensor signal is less than 3 percent. During time failure is present cruise control will be disengaged.

NOTE: Test numbers refer to numbers on diagnostic chart.

BD70 display indicates servo position. Normal range is greater than 3 percent.
Check to see if fault is due to short or open in feedback circuits. Normal resistance across feedback coil should be 15-30 ohms.
Checks to see if open circuit is due to servo or circuits.
Checks to see if problem is intermittent. BD70 display will not go as low or high as BS05 display, because of its mechanical limits of travel. It should never go to less than 3 percent.