Toyota 3L - Diesel Engine Diagnosis; Preliminary Checks; Troubleshooting

GENERAL
1. Diesel engine problems are usually caused by the engine or fuel system. The injection pump is very
rarely the cause of fuel system problems.
2. Before beginning fuel system tests, first check that the engine compression, valve timing and other
major systems are within specifications.
' I
PRELIMINARY CHECKS
Before performing fuel system checks, ensure that the engine is in good running condition. If neces-
sary, first check the compression, timing and major components or systems.
Check the air filter, and clean or replace
it if necessary.
Check that there
is sufficient fuel in the tank.
Check if the fuel
is contaminated with gasoline or other foreign elements. Only good-quality diesel fuel
should be used.
Bleed air from the system by pumping the priming.
Check for water in the fuel filter and fuel tank, and drain
as necessary.
If the engine will not crank or if
it cranks slowly, first troubleshoot the electrical system.
EM-4
ENGINE MECHANICAL - Troubleshooting (Diesel Engine Diagnosis)
TROUBLESHOOTING
Diesel Engine Diagnosis