CUMMINS N14 - Engine Speed Surges (Other Than Low Idle) (Continued)

Engine Speed Surges (Other Than Low Idle) (Continued)
Cause Corrections
----------
PT (VS, RSG, NON-Cummins
Auxiliary Governors)
NOTE: Includes, Woodward, Freightliner,
Vigual 3, etc.
1. Auxiliary Governor Adjusted Incorrectly
2. Road Speed Setting Too Low or Too High
in Top Gear
3. VS and Automotive Governors Set Too
Close
4. PT Fuel Pump Assembled or Adjusted
Incorrectly
OK
f
1. Adjust gain, stability, and droop. Refer to
manufacturer’s instructions.
2. Adjust road speed governor. Refer to PT
Fuel Pump Rebuild and Calibration
Manual, Bulletin No. 3379084.
3. Remove fuel pump and check governor
calibration. Refer to PT Fuel Pump
Rebuild and Calibration Manual, Bulletin
No. 3379084.
4. Remove fuel pump and check calibration
and verify correct parts. Refer to Proce-
dure 5-02.
----------
PT PACER
1. Air in EFC Module
2. Intermittent + 12VDC Supply to PCU
3. Engine Speed Sensor (ESS) Adjusted
Incorrectly
4. Engine Speed Sensor (ESS) Malfunction-
ing
5. Engine Fuel Control (EFC) Valve Electri-
cal Connection Problem
6. Plugged Internal Bypass Orifice or Filter
Screen
7. EFC Valve Component or Installation
Problem
8. EFC Valve Malfunctioning
9. Power Control Unit (PCU) Malfunctioning
OK
f
Refer to the Troubleshooting and Repair
Manual PT PACER Control System, Bulletin
No. 3810441.
1. Bleed air from EFC module.
2. Check + 12VDC supply wire to PCU, 10
amp fuse and connections and PCU
harness ground connections.
3. Adjust ESS.
4. Check ESS for short circuits and open
circuits. Remove ESS and check for
debris or damage.
5. Check terminal connections for discolora-
tion and tight fit.
6. Remove EFC module and check orifice
and filter screen.
7. Check EFC valve.
8. Replace EFC valve.
9. Replace PCU.
----------
CELECT™
1. Cruise Control Select Switch Malfunction-
ing
2. Engine Position Sensor (EPS) Malfunc-
tioning
3. Vehicle Speed Sensor (VSS) Malfunction-
ing
OK
f
Refer to N14 CELECT™ System Troubleshoot-
ing and Repair Manual, Bulletin No. 3810469.
1. Check cruise control select switch.
2. Check EPS seating, sensor, and circuit
wires.
3. Check VSS adjustment, sensor, and
circuit wires.
(Continued)
Troubleshooting Symptoms Charts SectionT-Troubleshooting
N14Page T-64