C4.4 and C6.6 Industrial Engines and Engines for Caterpillar Built Machines Caterpillar

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

• The 8 volt supply is more than 8.8 Volts DC for more than one second.

• The ECM has been powered for more than three seconds.

System Response:

The ECM will log the diagnostic code and the check engine lamp will illuminate while this diagnostic code is active.

The engine may be limited to low idle.

Note: The 8 volt supply may provide power to the digital throttle position sensor.

Note: The 8 volt supply provides power to the two speed/timing sensors.

Test Step 1. Perform the following diagnostic procedure: Digital Throttle Position Sensor Circuit - Test

Results:

• OK - STOP