Code 62 - Gear Switch Error: Notes
Code 62 is used to check 2nd and 3rd gear switch inputs to ECM. In order to determine transmission gear input signals to ECM, see INPUT SIGNALS TABLE.
INPUT SIGNALS
| Gear Position | Switch Position |
|---|---|
| Reverse | 2nd Closed, 3rd Open |
| Park/Neutral | 2nd Closed, 3rd Open |
| 1st | 2nd Closed, 3rd Open |
| 2nd | 2nd Open, 3rd Open |
| 3rd | 2nd Open, 3rd Closed |
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- If the following conditions are met for about 17 seconds, a Code 62 will be set:
- In Park or Neutral and 2nd or 3rd gear indicated.
- Vehicle speed less than about 5 MPH, and 2nd or 3rd gear indicated.
- First or 2nd gear indicated. Less than about 3000 RPM. Gear selector not in Park or Neutral, and VSS greater than 50 MPH.
The first step checks for an open or grounded circuit between transmission connector and ECM. Since ECM terminals are normally high, battery voltage should be indicated at both terminals with connector removed.
- Test light is used at this point to check transmission switches for normal state. Normal state should be 1st gear (or Park or Neutral) state. Test light should be off only for N.C. 2nd gear switch.
- This test checks for normally functioning transmission switches. In 3rd gear both switches should have changed from their original 1st gear state.