Powertrain Controls - ECM/PCM
Shift Solenoid "B" Circuit:
Circuit Description:
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. Code 81 will set if a fault has been detected on the shift solenoid "B" circuit. For example, if shift solenoid "B" is commanded "ON" by the PCM/TCM, the voltage on that circuit should drop when the solenoid is grounded, if the voltage stays up for at least .5 second, Code 81 will be set. The opposite is also true if shift solenoid "B" is "OFF" then the voltage on the circuit should remain high, if voltage drops for more than .5 second, then Code 81 will be set.
Shift Solenoid "B" Diagnostic Chart:
Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This procedure checks shift solenoid "B" and the internal transmission wiring for shorts.
2. This block checks for power to shift solenoid "B" from the ignition through the transmission fuse.
3. Test three verifies that CKT 1223 is not shorted to ground.
4. This test checks the ability of the PCM/TCM to ground or control shift solenoid "B".
5. The final test verifies that CKT 1223 is not shorted to ground.
Diagnostic Aids:
Check all connections, especially those at the transmission pass-thru connector. - Intermittent Malfunctions