DTC 81, Solenoid "B" Circuit Fault (1994): Notes

The PCM/TCM continually monitors voltage on each circuit connected to the quad-driver, looking for either low or high voltage, depending on the commanded state of the devices connected to it. DTC 81 will set if a fault has been detected on the shift solenoid "B" circuit, also referred to as 2-3 shift solenoid. For example, if shift solenoid "B" is commanded on by the PCM/TCM, voltage on that circuit should drop when solenoid is grounded. If voltage stays up for at least 2 seconds, DTC 81 will set. The opposite is also true. If shift solenoid "B" is off, voltage on the circuit should remain high. If voltage drops for more than 2 seconds, DTC 81 will set. PCM/TCM will default to maximum line pressure, 2nd or 3rd gear operation only and no TCC.

NOTE: Test numbers refer to numbers on diagnostic chart.

Test Number 1) This test checks function of shift solenoid "B" and transmission internal wiring.

Test Number 2) This test checks for power to shift solenoid "B" from ignition through the fuse.