Service manual

G424F(FE) Service Manual Chapter 4. Engine Electrical System 118
5. Is voltage equal to or greater than shown in
Figure1?
• If the starting motor voltage is correct, the
battery and starting motor cables down to the
motor are within specifications. Go to Step 8.
• If the starting motor voltage is low, the voltage
drop between the battery and the starting motor
is too great. Go to Step 6.
6. Measure the voltage drops in the cranking circuits
with the multimeter. Compare the results with
maximum voltage drops allowed in Figure 2.
7. Are all the voltages within specifications ?
• If the voltage drops are correct, go to Step 8, to
check the engine.
• If the voltage drops are too high, repair and/ or
replace the faulty electrical component.
8. Rotate the crankshaft by hand to make sure it is
not locked up. Check oil viscosity and any
external loads that would affect engine rotation.
9. Is the engine locked up or hard to turn ?
• If it is, repair the engine as required. If the
engine is not hard to turn, go to Step 10.
10. Does the starting motor crank?
• If it does crank, remove the starting motor for
repair and/or replacement.
• If it does not crank, check for blocked
engagement of the pinion and flywheel ring
gear.
NOTE: Blocked engagement and open solenoid
contacts will give the same electrical symptoms.
Start Relay Tests
Relay
1. Put the multimeter on the 200 ohm scale.
2. Put the multimeter lead to the 85 and 86 terminals.
3. The indication on the meter must be 82 5 ohms. If
the indication is not correct, the start relay must
be replaced.
4. Put the multimeter leads to the 30 and 87
terminals.
5. The indication must be "OL"(Over Load). If the
indication is not correct, the start relay must be
replaced.
6. Connect WH wire to 86 and BK wire to 85
terminal with the ignition switch to start position.
Put the meter lead to 30 and 87 terminal.
7. The indication must be Zero ohm. If the indication
is not correct the start relay must be replaced.