Troubleshooting

RENR2696-01 61
Troubleshooting Section
4. Use the electronic service tool to verify the
maximum engine
speed limit.
5. Use the electronic service tool to reset the
parameters to
the OEM specifications.
6. Ensure that the repairs have eliminated the
performance p
roblems.
7. If the repairs have not eliminated the faults
proceed to “El
ectronic System Problem”.
Electronic System Problem
1. Ensure th at the correct mode is selected.
2. Turn the start
switch to the ON position.
3. Use the electronic service tool to verify that the
intake manifo
ld pressure is 0 kPa (0 psi). Check
the 5 V sensor supply for the intake manifold
pressure. Refer to Troubleshooting, “5 Volt Engine
Pressure Sen
sor Supply Circuit - Test”.
4. Use the electronic service tool to verify the throttle
position st
atus.
5. Run the engine until the speed is equal to the
maximum no-
load speed.
6. If the maximum no-load speed can not be obtained
refer to Tro
ubleshooting, “Throttle Switch Circuit
- Test” and Troubleshooting, “Mode Selection
Circuit - Test”.
7. If the engine speed is erratic refer to
Troubleshooting, “Throttle Position Sensor Circuit
-Test”.
i01798136
Mechanica
l Noise (Knock) in
Engine
Probable C
auses
•
Accessory equipment
•
Valve train components
•
Connectin
g rod and main bearings
Recommended Ac
tions
Accessory Equipment
Isolate the source of the noise. Remove the suspect
engine accessories. Inspect the suspect engine
accessories.
Repair the engine accessories and/or
replace the engine accessories if any defects are
found.
Valve Train C omponents
Remove the val
ve mechanism covers. Check the
following items for damage: camshaft, valve springs,
lifters, pushrods, and bridges. Thoroughly clean the
valve train c
omponents. If the camshaft is being
replaced, also replace the valve lifters. Ensure that
all of the valves move freely. Replace any damaged
parts.
Connecting Rod and Main Bearings
Inspect the connecting rod and main bearings.
Also, inspect the bearing surfaces (journals) on the
crankshaft
. Replace any damaged parts.
i01798137
Noise Com ing from Cylinder
Probable Causes
•
Fuel quality
•
Fuel injection nozzles
•
Valve lash
Recommended Actions
Fuel Quality
Check the fuel quality. Remove unsatisfactory fuel
from the fuel tank. Install new fuel filters. Use the
proper grade of clean fuel in the fuel tank.
Fuel Injection Nozzles
1. Remove the fuel injection nozzles from the cylinder
head. Refer to Disassembly and Assembly, “Fuel
Injection Nozzle - Remove”.
2. Check the fuel injection nozzles. Refer to Testing
and Adjusting, “Fuel Injection Nozzle - Test”.
3. Ensure that the repairs have eliminated the
problems.