3176C and 3406E Engines for D7R Series II and D8R Series II Track-Type Tractors Caterpillar

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

• The duty cycle of the sensor is greater than 95 percent or less than 5 percent for one second or the sensor frequency is greater than 1000 Hz or less than 150 Hz for two seconds.

• 041-03 diagnostic code is not active.

• 041-04 diagnostic code is not active.

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

System Response:

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

• Reduced engine speed

Note: If the engine is being operated above 1000 rpm, the ECM will drop the engine speed to 1000 rpm. If the engine is being operated below 1000 rpm, the ECM will maintain the engine speed.

Test Step 1. Perform the following test: Decelerator Position Sensor Circuit - Test

Results:

• OK - Stop.