Code 62, Gear Switch Error (W Body): Notes
NOTE:
Code 62 has been revised for some models. Before proceeding with any further testing see appropriate TSB's under symptoms of CHECK ENGINE LIGHT.
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.
INPUTS SIGNALS
| Gear Position | Switch Position |
|---|---|
| 1st (Also P/N & R) | 2nd Closed |
| " | 3rd Closed |
| 2nd | 2nd Open |
| " | 3rd Closed |
| 3rd | 2nd Open |
| " | 3rd Open |
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.
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.
- Digital voltmeter should measure near battery voltage because 2nd and 3rd gear switches should provide continuity to ground.
- This tests normally transmission switch function. In 3rd gear, both switches should have changed from their original 1st gear state.