Component Testing

Dynamic Test

1. Ignition OFF, disconnect the harness connector at the B227 Gear Position Sensor.
2. Connect the test leads of the J-38522-A vehicle signal generator as follows:
   • Red test lead to the signal circuit 1 terminal 3 at the B227 Gear Position Sensor wire harness connector.
   • Black test lead to ground at the transmission case.
   • Double black power and ground lead wire to B+ and ground.
3. Set and adjust the J-38522-A vehicle signal generator to the following switch positions:
   • Signal switch to 5 V.
   • Frequency switch to 600 Hz.
   • Duty cycle switch to 10%.
4. Ignition ON.
5. Verify the scan tool Gear Shift Position Sensor parameter duty cycle is 10% ± 2%.
6. Set duty cycle switch to 20%, then 30% and so on through 90%.
7. Verify the scan tool Gear Shift Position Sensor parameter duty cycle matches the duty cycle for each switch position on the vehicle signal generator ± 2%.
   • If the Gear Shift Position Sensor parameter does not match vehicle signal generator duty cycle ± 2% 

     Replace the K20 Engine Control Module.

   • If the Gear Shift Position Sensor parameter matches the vehicle signal generator duty cycle 
8. Repeat the above test, changing only the J-38522-A vehicle signal generator Red test lead to the signal circuit 2 terminal 2 at the B227 Gear Position Sensor wire harness connector.
9. Verify the scan tool Gate Select Position Sensor parameter duty cycle matches the duty cycle for each switch position on the vehicle signal generator ± 2%.
   • If the Gate Select Position Sensor parameter does not match vehicle signal generator duty cycle ± 2% 

     Replace the K20 Engine Control Module.

   • If the Gate Select Position Sensor parameter does match vehicle signal generator duty cycle 
10. All OK.