TROUBLESHOOTING
Troubleshooting - 79
Engine (Continued)
Symptom: Possible Cause:
The oil light comes on when the engine is run-
ning.
The oil level is low.
A faulty oil sender.
A faulty or plugged oil pump.
The engine emits white smoke. The engine temperature is low.
A faulty head gasket.
There is water in the combustion chamber.
The engine uses excessive fuel. Plugged or restricted air lters or air intake hoses.
Dirty or faulty fuel injectors.
The engine uses excessive oil. The engine has an oil leak.
The oil is an incorrect viscosity.
Plugged or restricted air lters or air intake hoses.
The engine has worn rings or cylinder walls.
The engine has worn or faulty valves.
Electrical
Anytime there is an electrical issue, rst check to ensure the LED light for the Power input (bottom right corner)
of the TCM is turned on when the key is in the o position. If the light is not on:
a. Check the battery disconnect switch to ensure that it is turned on.
b. If the battery disconnect switch was already turned on, the TCM may be in Sleep mode. Turn the battery
disconnect switch o for ten seconds and then turn back on to wake the TCM.
c. Check the 15 amp fuse in slot number 10 of the front fuse panel. Replace this fuse, if necessary.
Next, turn the key to the run position and check to see if any of the other lights turn on. If no other lights turn
on, check the 5 amp fuse in slot number 8 of the front fuse panel. Replace this fuse, if necessary. If any other
lights turn on, you can begin troubleshooting the rest of the TCM functions.
Symptom: Possible Cause:
The battery does not charge. Loose or corroded battery connections.
A broken or loose wire in the charge system.
A blown fuse or fuse link in the charge system.
The battery is defective.
The alternator / fan belt is loose.
A faulty regulator.
A faulty alternator.
The lights do not activate. A blown fuse.
A blown light bulb.
A broken wire.
A faulty light switch.
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