EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-88 90-860074--1 FEBRUARY 2002
Troubleshooting Charts (Continued)
CONDITION POSSIBLE CAUSES CORRECTION
COOLANT
TEMPERATURE
BELOW
NORMAL
1. Incorrect thermostat or
Contamination in thermostat.
2. Temperature sensor or
gauge inoperative.
3. Coolant not flowing by
temperature sensor.
1. Check and replace
thermostat.
2. Verify that the gauge and
sensor are accurate. If not,
replace gauge/sensor.
3. Check and clean coolant
passages.
LUBRICATING
OIL PRESSURE
LOW
1. Low oil level.
2. Oil viscosity thin. diluted or
wrong specification.
3. Improperly operating
pressure switch/gauge.
4. Relief valve stuck open.
5. Plugged oil filter.
6. If cooler was replaced,
snipping plugs remain in
cooler.
7. Worn oil pump.
8. Suction tube loose or seal
leaking.
9. Loose main bearing cap.
10. Worn bearings or wrong
bearings installed.
11. Oil jet under piston bad fit
into main carrier.
1. (A) Check and fill with clean
engine oil.
(B) Check for a severe
external oil leak that could
reduce the pressure.
2. Verify the correct oil is being
used. Check for oil dilution.
Refer to Contaminated Lube
Oil (Engine Diagnosis
Mechanical).
3. Verify the pressure switch is
functioning correctly. If not,
replace switch/gauge.
4. Check/replace valve.
5. Change oil filter. Oil filter
change interval may need to
be revised.
6. Check/remove shipping
plugs.
7. Check and replace oil pump.
8. Check and replace seal.
9. Check and install new
bearing and tighten cap to
proper torque.
10. Inspect and replace
connecting rod or main
bearings. Check and replace
piston cooling nozzles.
11. Check oil jet position.
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