Signal Sporadic, Faulty Signal

Checking Cables and Terminals
- Check engine speed (RPM) sensor and engine control module (ECM) connectors for loose connections and contact resistance and oxidation.
- Check the cables between the engine control module and engine speed (RPM) sensor for an intermittent open-circuit, an intermittent short-circuit to ground and an intermittent short-circuit to supply voltage.
- Are cables and terminals OK?

Yes:
^ Check carrier plate/flywheel through the engine speed sensor hole for damage and scratches. If no faults are detected on the carrier plate/flywheel, try a new engine speed sensor.
^ Proceed to: Fault-tracing Information section below.

No:
^ Remedy as necessary.

Fault-tracing Information
Fault-tracing for this diagnostic test is not followed by a verification.

- Do you want to repeat the fault-tracing for this diagnostic test?

Yes:
^ Proceed to: Checking Cables and Terminals section above.

No:
^ Fault corrected.