Troubleshooting

58 RENR2696-01
Troubleshooting Section
4. Verify that the ECM connections for the power
and ground conn
ections at the fuel pump are
connected properly.
5. If a fault is su
spected with the fuel injection
pump power and ground connections refer to
Troubleshooting, “Fuel Injection Pump Circuit -
Test” .
6. Repair any faults and ensure that the faults have
been elimina
ted.
7. If the repairs do not eliminate the faults, proceed
to “Check the
Throttle Position Sensor”.
Check the Throttle Position Sensor
1. Use the electronic service tool to observe the
throttle position status.
2. Operate the engine at a maximum no-load
speed. Check that the throttle position (%) is
inside cali
bration (80 to 87%) at high idle if the
programmed limit for the upper demand cannot
be obtained.
3. If the engine speed is erratic, reduce the engine
speed.
4. Check that the calibration of the low idle is within
20 to 27%.
5. Slowly increase the engine speed. Check that the
engine speed is steady. Check that the position
increases
with more throttle.
6. Refer to Troubleshooting, “Throttle Position Circuit
-Test”.
i01798134
Low Engine
Oil Pressure
NOTICE
Do not oper
ate the engine with low oil pressure.
Engine damage will result. If measured oil pressure is
low, discontinue engine operation until the problem is
correcte
d.
Probable Causes
•
Engine oil level
•
Engine oi
l pressure gauge
•
Engine oil bypass valves
•
Piston cooling jets (if equipped)
•
Engine oil suction tube
•
Engine oil pump
•
Bearing clearance
Recommended Actions
Engine Oil Level
Inspect the en
gine oil level. If necessary, add oil.
Engine Oil P ressure Gauge
Check the actual engine oil pressure with a
mechanical gauge. Compare the oil pressure reading
from the elect
ronic service tool to the pressure on the
mechanical gauge.
Engine Oil By
pass Valves
1. Remove the engine oil bypass valves and clean
the engine oi
l bypass valves. Clean the bores in
the oil filter base for the bypass valves. Refer to
Disassembly and Assembly, “Engine Oil Filter
Base - Disass
emble”.
2. Install new engine oil filters. Refer to the Operation
and Mainten
ance Manual for more information.
Piston Cooling Jets (if equipped)
Inspect the piston cooling jets for damage. Replace
any piston cooling jet that appears to be cracked or
broken. Ref
er to Disassembly and Assembly, “Piston
Cooling Jets - Remove and Install” for the correct
procedure.
Engine Oil Suction Tube
1. Check the i
nlet screen on the oil suction tube
and remove any material that may be restricting
oil flow.
2. Check the joints of the oil suction tube for cracks
or a damaged O ring seal that may allow air
leakage i
nto the supply to the oil pump.
Engine Oil Pump
Inspect the components of the engine oil pump for
excessive wear. Repair the oil pump or replace the
oil pump,
if necessary.