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6
Problem Solving
6.1
Problem Solving Chart
The chart helps to solve mechanical problems.
It is assumed that the engine is in good condition and that there
is adequate fuel flow to the filter and injection equipment.
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An electrical fault must be traced by an electrician.
Make sure that the wires are not damaged and that they are
clamped tight to their terminals.
6.2
Alternator Precautions
1.
Never reverse the polarity of the battery or the alternator.
2.
Never break any alternator or battery connections while the
engine is running.
3.
When recharging the battery, disconnect it from the
alternator. Before using booster cables to start the engine, be
sure of the polarity and connect the batteries positive to
positive, negative to negative.
4.
Never operate the engine without the main or voltage sensing
cables connected in the circuit.
Problem
Possible faults
Corrective actions
1. Lamps (H1, H2) do not
light up when switching
(S1)to” l “)and applying
lamp test.
a.
Discharged or defective battery.
b.
Loose battery cable(s) or oxidized
terminals.
c.
Loose connection or damaged wiring.
d.
Contact switch (S1) defective.
e.
Circuit breaker defective.
a.
Check electrolyte level and charge battery.
If no cells are shorted and battery is
discharged, trace cause and correct.
b.
Check and correct as necessary.
c.
Check wiring and connections, correct as
necessary.
d.
With (S1) switched in” I “, check voltage
between ground and respectively each of the
terminals of (S1). Voltage must register at
each of the terminals; if not, replace (S1).
e.
Replace circuit breaker.
2. General alarm lamp (H2)
does not light up when
switching (S1) to “1”;
lamp (H1) lights up when
applying lamptest.
a.
Lamp (H2) blown,
b.
Alternator/regulator defective.
a.
Replace lamp.
b.
Disconnect the wire from alternator terminal
D+ and connect it to terminal D-. If (H1)
lights up, replace the alternator; if not, test
(S1); see remedy 1d.
3. Temperature alarm lamp
(H1) does not light up
when switching (S1) to “I“
and applying lamp test.
a.
Lamp (H1) blown,
b.
See fault 1d.
a.
Replace lamp.
b.
See 1d.
4.
Starter motor does not
crank engine after
switching (S1) to “I”
a.
Low battery output.
b.
Start button (S1) defective.
c.
Alternator output inlay (K4) defective.
d.
Start solenoid (KO) or starter motor
defective
a.
See remedy 1 a.
b.
With (S1) in check voltage between earth
and respectively each of the terminals of
(S1). Voltage must register at each of the
terminals; if not, replace (S1).
c.
Replace (K4).
d.
Check start solenoid (K0). Have starter
motor repaired.
5.
Starter motor cranks engine
when Switching S1 to “I”
but engine does not fire.
a.
Switch (S1) defective,
b.
Fuel solenoid (Y1) defective.
c.
Low battery output.
a.
See remedy 4b.
b.
Check solenoid and its valve; correct or
replace as necessary.
c.
see la
