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Mechanical Diagnosis
Condition Possible Cause Remedy
Unit switch On—nothing happens Dead battery Recharge or replace battery
Remote switch Off (optional) Turn On
Fuse open Replace
Corroded battery connections Clean and tighten
Main harness fuse blown Check for shorted main harness and
replace fuse
Unit switch On—indicator lights
come on but engine does not
crank
Battery low Replace or recharge battery
Fuse blown Replace
Starter solenoid defective Repair or replace
Starter relay defective Replace relay
Corroded battery connections Clean and tighten
Starter clutch defective Replace
Starter defective Repair or replace
Engine cranks but fails to start Misadjusted fuel solenoid linkage Adjust
Fuel solenoid defective Replace solenoid
No fuel or wrong fuel in tank Fill fuel tank. After filling a
completely empty tank, first bleed
fuel system.
Engine too cold Use winter preheat procedure
Glow plugs defective Replace glow plugs
Air in fuel system Bleed fuel system. During this
operation, it can also be determined
if the fuel lines are tight and filters
clean.
Speed/run relay malfunction Check relay or unit thermostat
Insufficient compression Measure compression pressure. If
necessary, grind valves or replace
piston
Electric fuel pump not operating Check pump for running and 8 to
10 psig (55 to 69 kPa). Repair or
replace fuel pump
Injection pump incorrectly timed Adjust timing
Faulty injection nozzle(s) Repair injection nozzle or replace it
Faulty injection pump Have pump repaired
Fuse F6 Open Replace fuse
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