3406E and 3456 Generator Set Engines Caterpillar

The Electronic Control Module (ECM) detects all of the following conditions:

• Either the duty cycle is greater than 95 percent or less than five percent for one second, or the sensor frequency is greater than 1000 Hz or less than 150 Hz for two seconds.

• There are no active diagnostic codes for the digital sensor supply (8 Volt DC).

• The ECM has been powered for at least three seconds.

System Response:

The ECM will log the diagnostic code. The ECM flags the throttle position as invalid data and a default value of 0 percent is used.

Possible Performance Effect:

• Reduced engine speed (low idle)

Troubleshooting:

Test Step 1. Perform the following diagnostic procedure: "Speed Control - Test"

Results:

• OK - STOP