3406E and 3456 Generator Set Engines Caterpillar

The Electronic Control Module (ECM) will log a diagnostic code if the ECM detects all of the following conditions:

• The engine speed is greater than 0 rpm.

• The pattern for the timing ring is incorrect for five seconds.

The ECM will log a diagnostic code, and the ECM will have an active diagnostic code if the ECM detects all of the following conditions:

• The engine speed is greater than 0 rpm.

• The pattern for the timing ring is incorrect for five seconds.

• The pattern for the timing ring is correct again for five seconds.

System Response:

The ECM will log the diagnostic code. The diagnostic code may be viewed on a display module or on the Caterpillar Electronic Technician (ET).

Possible Performance Effect:

• Engine misfires

• Engine shutdown

Note: The engine will shut down only if the primary engine speed/timing sensor and the secondary engine speed/timing sensor are abnormal.

Troubleshooting:

Test Step 1. Perform the following diagnostic procedure: "Engine Speed/Timing Sensor Circuit - Test"

Results:

• OK - STOP