Engine System, Diesel 241Service Manual – CS7000
Diagnostic steps:
1. Check governor control system.
a. Does the APECS governor controller status light ash once immediately following “key on”?
If not, check power and grounds for the APECS governor controller
If so, go on to next step
b. Does the status light come on during cranking?
If not, check the Engine RPM sensor input. (Resistance and voltage output while cranking)
If so, go on to next step
c. Is there more than 4 volts available to the actuator during cranking?
If not, the governor controller may have failed.
If so, the governor controller appears to be working correctly. Check the fuel actuator
2. Check the fuel actuator
a. Check the actuator resistance. It should be around 3.0 ohms.
If it is open or shorted, replace the actuator. If it is Okay, go to the next test.
b. Substitute the function of the actuator by removing it from the injection pump and operating the
throttle control manually. (You can reach into the hole and operate it with your nger or use the
dead man lever on the side of the injector pump)
3. Check fuel system
a. Check the fuel for contamination
b. Check the fuel pressure to the injector pump during cranking
If the fuel supply system is Okay, check the mechanical engine.
4. Check mechanical engine
a. Check compression
b. Check for plugged intake or exhaust
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