PISTON-CLUTCH 8E6630 - Caterpillar

The Electronic Control Module (ECM) detects the following conditions:
The ECM has been powered for 3 seconds.
No 0262 codes are active for the analog sensors.
No 0041 codes are active for the digital (PWM) sensors.
Diagnostic codes 0774-03 and 0774-04 are not active.
The frequency of the signal from the digital (PWM) sensor is less than 150 Hz for more than 1 second.
The frequency of the signal from the digital (PWM) sensor is greater than 1050 Hz for more than 1 second.System Response:The ECM will log the diagnostic code. The diagnostic code may be viewed on the electronic service tool.The ECM will return the engine to low idle or to a safe speed while the diagnostic code is active.Possible Performance Effect:Throttle inputs are ignored by the ECM until the fault is repaired.Throttle inputs will also be ignored by the ECM until the keyswitch has been turned to the OFF position and then back to the ON position.The engine will default to the limp home mode.If a second throttle is installed, the engine will use the second throttle until the fault is repaired.Troubleshooting:Monitor the configuration screen on the electronic service tool in order to determine the type of throttle position sensor that is used on the engine.If the engine is equipped with an analog throttle position sensor, proceed to “Test Step 1”.If the engine is equipped with a digital (PWM) throttle position sensor, proceed to “Test Step 2”.Test Step 1. Perform the following diagnostic procedure: "Analog Throttle Position Sensor Circuit - Test"Results:
OK - STOPTest Step 2. Perform the following diagnostic procedure: "Digital Throttle Position Sensor Circuit - Test"Results:
OK - STOP