CODE 62, GEAR SWITCH ERROR
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.
| Gear Position | Switch Position |
|---|---|
| 1st (Also P/N & R) | 2nd Closed |
| 1st (Also P/N & R) | 3rd Open |
| 2nd | 2nd Open |
| 2nd | 3rd Open |
| 3rd | 2nd Open |
| 3rd | 3rd Closed |
INPUT SIGNALS
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 zero volt at terminal "B" because 3rd gear switch should be open, providing no continuity to ground. Terminal "C" should measure near battery voltage because 2nd gear switch should provide continuity to ground.
- This test checks for normally functioning transmission switches. In 3rd gear both switches should have changed from their original 1st gear state.
Clear codes and recheck for Code 62. If code resets, check all harness connections, VSS, RPM, P/N circuits prior to replacing ECM. Transmission starting in 2nd or 3rd gear can also set a Code 62
