Initial Inspection and Diagnostic Overview
CHECK TACHOMETERa. Check operation.
1. Connect a tune-up test tachometer, and start the engine.
NOTE:
- Do not reverse the connections of the tachometer. This will damage its transistors and diodes.
- When removing or installing the tachometer, be careful not to drop or strike it.
2. Compare the tester tachometer values and vehicle tachometer values under the following conditions:
- Vehicle battery voltage is 13.5 V
- Ambient temperature is 25 degrees C (77 degrees F)
If the result is not as specified, the tachometer may have a malfunction.